DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 1 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
The FT245BL is the lead free version of the 2nd generation of FTDI’s popular USB FIFO I.C. This device not only
adds extra functionality to its FT8U245AM predecessor and reduces external component count, but also maintains a
high degree of pin compatibility with the original, making it easy to upgrade or cost reduce existing designs as well as
increasing the potential for using the device in new application areas.
1.0 Features
HARDWARE FEATURES
• Single Chip USB Parallel FIFO bi-directional
Data Transfer
• Transfer Data rate to 1M Byte / Sec - D2XX Drivers
• Transfer Data rate to 300 Kilobyte / Sec - VCP
Drivers
• Simple to interface to MCU / PLD/ FPGA logic with
a 4 wire handshake interface
• Entire USB protocol handled on-chip… no USB-
specific firmware programming required
• FTDI’s royalty-free VCP and D2XX drivers
eliminate the requirement for USB driver
development in most cases.
• 384 Byte FIFO Tx buffer / 128 Byte FIFO Rx Buffer
for high data throughput.
• New Send Immediate support via SI Pin for
optimised data throughput.
• Support for USB Suspend / Resume through
PWREN# and WAKEUP pins.
• Support for high power USB Bus powered devices
through PWREN# pin
• Adjustable RX buffer timeout
• In-built support for event characters
• Integrated level converter on FIFO and control
signals for interfacing to 5V and 3.3V logic
• Integrated 3.3V regulator for USB IO
• Integrated Power-On-Reset circuit
• Integrated 6MHz – 48Mhz clock multiplier PLL
• USB Bulk or Isochronous data transfer modes
• New Bit-Bang Mode allows the data bus to be used
as an 8 bit general purpose IO Port without the
need for MCU or other support logic.
• 4.35V to 5.25V single supply operation
• UHCI / OHCI / EHCI host controller compatible
• USB 1.1 and USB 2.0 compatible
• USB VID, PID , Serial Number and Product
Description strings in external EEPROM
• EEPROM programmable on-board via USB
• Compact Lead free RoHS compliant 32-LD LQFP
package
VIRTUAL COM PORT (VCP) DRIVERS for
- Windows 98 and Windows 98 SE
- Windows 2000 / ME / Server 2003 / XP
- Windows XP 64 Bit
- Windows XP Embedded
- Windows CE 4.2
- MAC OS-8 and OS-9
- MAC OS-X
- Linux 2.40 and greater
D2XX (USB Direct Drivers + DLL S/W Interface)
- Windows 98 and Windows 98 SE
- Windows 2000 / ME / Server 2003 / XP
- Windows XP 64 Bit
- Windows XP Embedded
- Windows CE 4.2
- Linux 2.4 and Greater
APPLICATION AREAS
- Easy MCU / PLD / FPGA interface to USB
- Upgrading Legacy Peripheral Designs to USB
- USB Instrumentation
- USB Industrial Control
- USB Audio and Low Bandwidth Video data transfer
- PDA USB data transfer
- USB MP3 Player Interface
- USB FLASH Card Reader / Writers
- Set Top Box (S.T.B.) PC - USB interface
- USB Digital Camera Interface
- USB Hardware Modems
- USB Wireless Modems
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 2 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
2.0 Enhancements
This section summarises the enhancements of the 2nd generation device compared to its FT8U245AM predecessor.
For further details, consult the device pin-out description and functional descriptions.
• Integrated Power-On-Reset (POR) Circuit
The device now incorporates an internal POR
function. The existing RESET# pin is maintained
in order to allow external logic to reset the device
where required, however for many applications
this pin can now be either left N/C or hard wired
to VCC. In addition, a new reset output pin
(RSTOUT#) is provided in order to allow the new
POR circuit to provide a stable reset to external
MCU and other devices. RSTOUT# was the TEST
pin on the previous generation of devices.
• Integrated RCCLK Circuit
In the previous devices, an external RC circuit
was required to ensure that the oscillator and
clock multiplier PLL frequency was stable prior
to enabling the clock internal to the device. This
circuit is now embedded on-chip – the pin assigned
to this function is now designated as the TEST pin
and should be tied to GND for normal operation.
• Integrated Level Converter on FIFO interface
and control signals
The previous devices would drive the FIFO and
control signals at 5V CMOS logic levels. The
new device has a separate VCCIO pin allowing
the device to directly interface to 3.3V and other
logic families without the need for external level
converter I.C.’s
• Power Management control for USB Bus
Powered, high current devices
A new PWREN# signal is provided which can be
used to directly drive a transistor or P-Channel
MOSFET in applications where power switching
of external circuitry is required. A new EEPROM
based option makes the device pull gently down
its FIFO interface lines when the power is shut
off (PWREN# is High). In this mode, any residual
1.1 General Description
The FT245BL provides an easy cost-effective method of transferring data to / from a peripheral and a host P.C. at up
to 8 Million bits (1 Megabyte) per second. Its simple, FIFO-like design makes it easy to interface to any microcontroller
or microprocessor via IO ports.
To send data from the peripheral to the host computer, simply write the byte-wide data into the module when TXE# is
low. If the (384-byte) transmit buffer fills up or is busy storing the previously written byte, the device keeps TXE# high
in order to stop further data from being written until some of the FIFO data has been transferred over USB to the host.
TXE# goes high after every byte written.
When the host sends data to the peripheral over USB, the device will take RXF# low to let the peripheral know that at
least one byte of data is available. The peripheral can read a data byte every time RXF# goes low. RXF# goes high
after every byte read.
By using FTDI’s virtual COM port drivers, the peripheral looks like a standard COM port to the application software.
Commands to set the baud rate are ignored - the device always transfers data at its fastest rate regardless of the
application’s baud-rate setting. Alternatively, FTDI’s D2XX drivers allow application software to access the device
“directly” through a published DLL based API. Details of the current VCP and D2XX driver can be found on FTDI’s web
site ( http://www.ftdichip.com )
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 3 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
voltage on external circuitry is bled to GND when
power is removed thus ensuring that external
circuitry controlled by PWREN# resets reliably
when power is restored. PWREN# can also be
used by external circuitry to determine when USB
is in suspend mode (PWREN# goes high).
• Send Immediate / WakeUp (SI / WU) signal
The new Send Immediate / WakeUp signal
combines two functions on a single pin. If USB is
in suspend mode (and remote wakeup is enabled
in the EEPROM), strobing this pin low will cause
the device to request a resume from suspend
(WakeUp) on the USB Bus. Normally, this can
be used to wake up the Host PC. During normal
operation, if this pin is strobed low any data in the
device RX buffer will be sent out over USB on the
next Bulk-IN request from the drivers regardless of
the packet size. This can be used to optimise USB
transfer speed for some applications.
• Lower Suspend Current
Integration of RCCLK within the device and internal
design improvements reduce the suspend current
of the FT245BL to under 100uA typical (excluding
the 1.5K pull-up on USBDP) in USB suspend
mode. This allows greater margin for peripherals to
meet the USB Suspend current limit of 500uA.
• Support for USB Isochronous Transfers
Whilst USB Bulk transfer is usually the best
choice for data transfer, the scheduling time of the
data is not guaranteed. For applications where
scheduling latency takes priority over data integrity
such as transferring audio and low bandwidth
video data, the new device now offers an option of
USB Isochronous transfer via an option bit in the
EEPROM.
• Programmable FIFO TX Buffer Timeout
In the previous device, the TX buffer timeout
used to flush remaining data from the TX buffer
was fixed at 16ms timeout. This timeout is now
programmable over USB in 1ms increments
from 1ms to 255ms, thus allowing the device to
be better optimised for protocols requiring faster
response times from short data packets.
• Relaxed VCC Decoupling
The 2nd generation devices now incorporate a level
of on-chip VCC decoupling. Though this does
not eliminate the need for external decoupling
capacitors, it significantly improves the ease of
PCB design requirements to meet FCC, CE and
other EMI related specifications.
• Bit Bang Mode
The 2nd generation device has a new option
referred to as “Bit Bang” mode. In Bit Bang mode,
the eight FIFO data lines can be switched between
FIFO interface mode and an 8-bit Parallel IO
port. Data packets can be sent to the device and
they will be sequentially sent to the interface at
a rate controlled by an internal timer (equivalent
to the prescaler of the FT232BL device). As well
as allowing the device to be used stand-alone
as a general purpose IO controller for example
controlling lights, relays and switches, some other
interesting possibilities exist. For instance, it may
be possible to connect the device to an SRAM
configurable FPGA as supplied by vendors such as
Altera and Xilinx. The FPGA device would normally
be un-configured (i.e. have no defined function) at
power-up. Application software on the PC could
use Bit Bang Mode to download configuration
data to the FPGA which would define its hardware
function, then after the FPGA device is configured
the FT245BL can switch back into FIFO interface
mode to allow the programmed FPGA device
to communicate with the PC over USB. This
approach allows a customer to create a “generic”
USB peripheral who’s hardware function can be
defined under control of the application software.
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 4 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
The FPGA based hardware can be easily upgraded
or totally changed simply by changing the FPGA
configuration data file. Application notes, software
and development modules for this application area
will be available from FTDI and other 3rd party
developers.
• Less External Support Components
As well as eliminating the RCCLK RC network, and
for most applications the need for an external reset
circuit, we have also eliminated the requirement
for a 100K pull-up on EECS to select 6MHz
operation. When the FT245BL is being used
without the configuration EEPROM, EECS, EESK
and EEDATA can now be left n/c. For circuits
requiring a long reset time (where the device is
reset externally using a reset generator I.C., or
reset is controlled by the IO port of a MCU, FPGA
or ASIC device) an external transistor circuit is
no longer required as the 1.5K pull-up resistor on
USBDP can be wired to the RSTOUT# pin instead
of to 3.3V. Note : RSTOUT# drives out at 3.3V
level, not at 5V VCC level. This is the preferred
configuration for new designs.
• Extended EEPROM Support
The previous generation of devices only supported
EEPROM of type 93C46 (64 x 16 bit). The new
devices will also work with EEPROM type 93C56
(128 x 16 bit) and 93C66 (256 x 16 bit). The extra
space is not used by the device, however it is
available for use by other external MCU / logic
whilst the FT245BL is being held in reset.
• USB 2.0 ( full speed option )
A new EEPROM based option allows the FT245BL
to return a USB 2.0 device descriptor as opposed
to USB 1.1. Note : The device would be a USB 2.0
Full Speed device (12Mb/s) as opposed to a USB
2.0 High Speed device (480Mb/s).
• Multiple Device Support without EEPROM
When no EEPROM (or a blank or invalid
EEPROM) is attached to the device, the FT245BL
no longer gives a serial number as part of its
USB descriptor. This allows multiple devices to
be simultaneously connected to the same PC.
However, we still highly recommend that EEPROM
is used, as without serial numbers a device can
only be identified by which hub port in the USB tree
it is connected to which can change if the end user
re-plugs the device into a different USB port.
• EEREQ# / EEGNT#
These (FT8U245AM) pins are no longer supported
on the FT245BL device. They have been replaced
with the new SI / WU and PWREN# signals
respectively.
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 5 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
3.0 Block Diagram ( simplified )
x8 Clock
Multiplier
Serial Interface
Engine
( SIE )
USB
Protocol Engine
FIFO Transmit
Buffer
384 Bytes
FIFO Receive
Buffer
128 Bytes
3.3 Volt
LDO
Regulator
USB
Transceiver
USB DPLL
6MHZ
Oscillator
48MHz
12MHz
XTIN
XTOUT
USBDP
USBDM
3V3OUT
VCC
RESET#
TEST
GND
FIFO
Controller
D0
D1
D2
D3
D4
D5
D6
D7
EEPROM
Interface
RD#
WR
EECS
EESK
EEDATA
RXF#
TXE#
PWREN#
RESET
GENERATOR RSTOUT#
3V3OUT
Send Immediate / WakeUP
3.1 Functional Block Descriptions
• 3.3V LDO Regulator
The 3.3V LDO Regulator generates the 3.3 volt
reference voltage for driving the USB transceiver
cell output buffers. It requires an external
decoupling capacitor to be attached to the 3V3OUT
regulator output pin. It also provides 3.3V power to
the RSTOUT# pin. The main function of this block
is to power the USB Transceiver and the Reset
Generator Cells rather than to power external logic.
However, external circuitry requiring 3.3V nominal
at a current of not greater than 5mA could also
draw its power from the 3V3OUT pin if required.
• USB Transceiver
The USB Transceiver Cell provides the USB 1.1 /
USB 2.0 full-speed physical interface to the USB
cable. The output drivers provide 3.3 volt level slew
rate control signalling, whilst a differential receiver
and two single ended receivers provide USB data
in, SEO and USB Reset condition detection.
• USB DPLL
The USB DPLL cell locks on to the incoming NRZI
USB data and provides separate recovered clock
and data signals to the SIE block.
• 6MHz Oscillator
The 6MHz Oscillator cell generates a 6MHz
reference clock input to the x8 Clock multiplier from
an external 6MHz crystal or ceramic resonator.
• x8 Clock Multiplier
The x8 Clock Multiplier takes the 6MHz input
from the Oscillator cell and generates a 12MHz
reference clock for the SIE, USB Protocol Engine
and FIFO controller blocks. It also generates a
48MHz reference clock for the USB DPLL.
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 6 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
• Serial Interface Engine (SIE)
The Serial Interface Engine (SIE) block performs
the Parallel to Serial and Serial to Parallel
conversion of the USB data. In accordance to the
USB 2.0 specification, it performs bit stuffing / un-
stuffing and CRC5 / CRC16 generation / checking
on the USB data stream.
• USB Protocol Engine
The USB Protocol Engine manages the data
stream from the device USB control endpoint. It
handles the low level USB protocol (Chapter 9)
requests generated by the USB host controller
and the commands for controlling the functional
parameters of the FIFO.
• FIFO Receive Buffer (128 bytes)
Data sent from the USB Host to the FIFO via
the USB data out endpoint is stored in the FIFO
Receive Buffer and is removed from the buffer by
reading the FIFO contents using RD#.
• FIFO Transmit Buffer (384 bytes)
Data written into the FIFO using WR# is stored in
the FIFO Transmit Buffer. The Host removes Data
from the FIFO Transmit Data by sending a USB
request for data from the device data in endpoint.
• FIFO Controller
The FIFO Controller handles the transfer of data
between the external FIFO interface pins and the
FIFO Transmit and Receive buffers.
• RESET Generator
The Reset Generator Cell provides a reliable
power-on reset to the device internal circuitry
on power up. An additional RESET# input and
RSTOUT# output are provided to allow other
devices to reset the FT245BL, or the FT245BL
to reset other devices respectively. During reset,
RSTOUT# is driven low, otherwise it drives out
at the 3.3V provided by the onboard regulator.
RSTOUT# can be used to control the 1.5K
pull-up on USBDP directly where delayed USB
enumeration is required. RSTOUT# will be low for
approximately 5ms after VCC has risen above 3.5V
AND the device oscillator is running AND RESET#
is high. RESET# should be tied to VCC unless it
is a requirement to reset the device from external
logic or an external reset generator I.C.
• EEPROM Interface
Though the FT245BL will work without the optional
EEPROM, an external 93C46 (93C56 or 93C66)
EEPROM can be used to customise the USB VID,
PID, Serial Number, Product Description Strings
and Power Descriptor value of the FT245BL for
OEM applications. Other parameters controlled
by the EEPROM include Remote Wake Up,
Isochronous Transfer Mode, Soft Pull Down on
Power-Off and USB 2.0 descriptor modes.
The EEPROM should be a 16 bit wide
configuration such as a MicroChip 93LC46B or
equivalent capable of a 1Mb/s clock rate at VCC =
4.35V to 5.25V. The EEPROM is programmable-
on board over USB using a utility available from
FTDI’s web site ( http://www.ftdichip.com ). This
allows a blank part to be soldered onto the PCB
and programmed as part of the manufacturing and
test process.
If no EEPROM is connected (or the EEPROM is
blank), the FT245BL will use its built-in default VID,
PID Product Description and Power Descriptor
Value. In this case, the device will not have a serial
number as part of the USB descriptor.
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 7 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
4.0 Device Pin-Out
Figure 1
Pin-Out
(Lead free LQFP-32 Package )
Figure 2
Pin-Out
(Schematic Symbol )
EESK
EEDATA
VCC
RESET#
RSTO#
3V3OUT
USBDP
USBDM
GND
PWREN#
SI / WU
RXF#
TXE#
WR
RD#
VCCIO
GND
D7
D6
D5
D4
D3
D2
D1
D0
VCC
XTOUT
XTIN
AGND
AVCC
TEST
EECS
1
8
916
17
24
25
32
FT245BL
XXYY
FTDI
25
24
23
22
21
20
19
18
15
16
14
12
11
10
6
8
7
5
27
28
4
32
1
31
2
30
3
26
13
29
17
9
3V3OUT
USBDP
USBDM
RSTOUT#
XTIN
XTOUT
RESET#
EECS
EESK
EEDATA
TEST
D0
D1
D2
D3
D4
D5
D6
D7
RD#
SI / WU
RXF#
WR
TXE#
PWREN#
G
N
D
G
N
D
A
G
N
D
A
V
V
C
V
C
C
V
C
C
V
C
C
I
O
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 8 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
4.1 Signal Descriptions
Table 1 - FT245BL - PINOUT DESCRIPTION
FIFO DATA BUS GROUP (*** Note 1)
Pin# Signal Type Description
25 DO I/O FIFO Data Bus Bit 0
24 D1 I/O FIFO Data Bus Bit 1
23 D2 I/O FIFO Data Bus Bit 2
22 D3 I/O FIFO Data Bus Bit 3
21 D4 I/O FIFO Data Bus Bit 4
20 D5 I/O FIFO Data Bus Bit 5
19 D6 I/O FIFO Data Bus Bit 6
18 D7 I/O FIFO Data Bus Bit 7
FIFO CONTROL INTERFACE GROUP
Pin# Signal Type Description
16 RD# IN Enables Current FIFO Data Byte on D0..D7 when low. Fetches the next FIFO
Data Byte (if available) from the Receive FIFO Buffer when RD# goes from low
to high. *** Note 1
15 WR IN Writes the Data Byte on the D0..D7 into the Transmit FIFO Buffer when WR goes
from high to low. *** Note 1
14 TXE# OUT When high, do not write data into the FIFO. When low, data can be written into
the FIFO by strobing WR high then low. *** Note 2
12 RXF# OUT When high, do not read data from the FIFO. When low, there is data available in
the FIFO which can be read by strobing RD# low then high again *** Note 2
USB INTERFACE GROUP
Pin# Signal Type Description
7USBDP I/O USB Data Signal Plus (Requires 1.5K pull-up to 3V3OUT or RSTOUT#)
8USBDM I/O USB Data Signal Minus
EEPROM INTERFACE GROUP
Pin# Signal Type Description
32 EECS I/O EEPROM – Chip Select. For 48MHz operation pull EECS to GND using a 10K
resistor. For 6MHz operation no resistor is required. *** Note 3
1EESK OUT Clock signal to EEPROM. Adding a 10K pull down resistor onto EESK will cause
the FT245BL to use USB Product ID 6005 (hex) instead of 6001 (hex). All of the
other USB device descriptors are unchanged. *** Note 3
2EEDATA I/O EEPROM – Data I/O Connect directly to Data-In of the EEPROM and to Data-
Out of the EEPROM via a 2.2K resistor. Also pull Data-Out of the EEPROM to
VCC via a 10K resistor for correct operation. *** Note 3
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 9 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
POWER CONTROL GROUP
Pin# Signal Type Description
10 PWREN# OUT Goes Low after the device is configured via USB, then high during USB suspend.
Can be used to control power to external logic using a P-Channel Logic Level
MOSFET switch. Enable the Interface Pull-Down Option in EEPROM when using
the PWREN# pin in this way.
11 SI / WU IN The Send Immediate / WakeUp signal combines two functions on a single pin. If
USB is in suspend mode (PWREN# = 1) and remote wakeup is enabled in the
EEPROM , strobing this pin low will cause the device to request a resume on the
USB Bus. Normally, this can be used to wake up the Host PC.
During normal operation (PWREN# = 0), if this pin is strobed low any data in the
device TX buffer will be sent out over USB on the next Bulk-IN request from the
drivers regardless of the pending packet size. This can be used to optimise USB
transfer speed for some applications. Tie this pin to VCCIO if not used.
MISCELLANEOUS SIGNAL GROUP
Pin# Signal Type Description
4 RESET# IN Can be used by an external device to reset the FT245BL. If not required, tie to
VCC.
5 RSTOUT# OUT Output of the internal Reset Generator. Stays high impedance for ~ 5ms after
VCC > 3.5V and the internal clock starts up, then clamps its output to the 3.3V
output of the internal regulator. Taking RESET# low will also force RSTOUT# to
drive low. RSTOUT# is NOT affected by a USB Bus Reset.
27 XTIN IN Input to 6MHz Crystal Oscillator Cell. This pin can also be driven by an external
6MHz clock if required. Note : Switching threshold of this pin is VCC/2, so if
driving from an external source, the source must be driving at 5V CMOS level or
a.c. coupled to centre around VCC/2.
28 XTOUT OUT Output from 6MHz Crystal Oscillator Cell. XTOUT stops oscillating during USB
suspend, so take care if using this signal to clock external logic.
31 TEST IN Puts device in I.C. test mode – must be tied to GND for normal operation.
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 10 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
POWER AND GND GROUP
Pin# Signal Type Description
63V3OUT OUT 3.3 volt Output from the integrated L.D.O. regulator This pin should be decoupled
to GND using a 33nF ceramic capacitor in close proximity to the device pin. Its
prime purpose is to provide the internal 3.3V supply to the USB transceiver cell
and the RSTOUT# pin. A small amount of current (<= 5mA) can be drawn from
this pin to power external 3.3V logic if required.
3,26 VCC PWR +4.35 volt to +5.25 volt VCC to the device core, LDO and none-FIFO interface
pins.
13 VCCIO PWR +3.0 volt to +5.25 volt VCC to the FIFO interface pins 10..12, 14..16 and 18..25.
When interfacing with 3.3V external logic in a bus powered design connect
VCCIO to a 3.3V supply generated from the USB bus. When interfacing with
3.3V external logic in a self powered design connect VCCIO to the 3.3V supply
of the external logic. Otherwise connect to VCC to drive out at 5V CMOS level.
9,17 GND PWR Device - Ground Supply Pins
30 AVCC PWR Device - Analog Power Supply for the internal x8 clock multiplier
29 AGND PWR Device - Analog Ground Supply for the internal x8 clock multiplier
Note 1 : In Input Mode, these pins are pulled to VCCIO via internal 200K resistors. These can be programmed to
gently pull low during USB suspend ( PWREN# = “1” ) by setting this option in the EEPROM.
Note 2: During device reset, these pins are tri-state but pulled up to VCCIO via internal 200K resistors.
Note 3: During device reset, these pins are tri-state but pulled up to VCC via internal 200K resistors.
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 11 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
FT245BL TIMING DIAGRAM – FIFO READ CYCLE
Time Description Min Max Unit
T1 RD Active Pulse Width 50 ns
T2 RD to RD Pre-Charge Time 50 + T6 ns
T3 RD Active to Valid Data *** Note 4 20 50 ns
T4 Valid Data Hold Time from RD Inactive *** Note 4 0 ns
T5 RD Inactive to RXF# 0 25 ns
T6 RXF inactive after RD cycle 80 ns
*** Note 4 - Load 30 pF
FT245BL TIMING DIAGRAM – FIFO WRITE CYCLE
Time Description Min Max Unit
T7 WR Active Pulse Width 50 ns
T8 WR to WR Pre-Charge Time 50 ns
T9 Data Setup Time before WR inactive 20 ns
T10 Data Hold Time from WR inactive 0 ns
T11 WR Inactive to TXE# 5 25 ns
T12 TXE inactive after WR cycle 80 ns
valid data
TXE#
T7 T8
T12
T9
T10
T11
WR
D0..D7
D0..D7
RD#
RXF#
valid data
T1 T2
T6
T3 T4
T5
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 12 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
Figure 3 – 32 LD Lead free LQFP Package Dimensions
5.0 Package Outline
The FT245BL is supplied in a 32 pin lead free LQFP package as standard. This package has a 7mm x 7mm body
( 9mm x 9mm including leads ) with leads on a 0.8mm pitch. The above drawing shows the LQFP-32 package – all
dimensions are in millimetres. Note that there are two date code formats used - XXYY = Date Code where XX = 1 or 2
digit year number, YY = 2 digit week number); or XYY-1 where X = 1 digit year number, YY = 2 digit week number.
The FT245BL is fully compliant with the European Union RoHS directive.
An alternative 5mm x 5mm leadless QFN is also available for projects where package area is critical. Part number
for this version is FT245BQ. The FT245BQ is also a lead free package. See the seperate datasheet for package
dimensions.
0.6 +/- 0.15
0.15 Max
Pin # 1
0.25
1.60
MAX
1
2
o+/- 1o
1.4 +/- 0.05
0.2 Min
1
0.05 Min
0.37 +/- 0.07
0.35 +/- 0.05
0.09 Min
0.2 Max
0.09 Min
0.16 Max
7
9
79
3
2
0.8
FT245BL
FTDI
XXYY
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 13 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
6.0 Absolute Maximum Ratings
These are the absolute maximum ratings for the FT245BL device in accordance with the Absolute Maximum Rating System
(IEC 60134). Exceeding these may cause permanent damage to the device.
Parameter Value Units
Storage Temperature –65oC to + 150oC Degrees C
Floor Life (Out of Bag) at Factory Ambient
(30oC/60% Relative Humidity)
192 Hours (Level 3 Compliant)
**Note 5
Ambient Temperature (Power Applied) 0oC to + 70oC Degrees C
M.T.B.F. (at 35oC) 247484 Hours ≈ 28 Years
VCC Supply Voltage -0.5 to +6.00 V
D.C. Input Voltage - USBDP and USBDM -0.5 to +3.8 V
D.C. Input Voltage - High Impedance Bidirectionals -0.5 to +(Vcc +0.5) V
D.C. Input Voltage - All other Inputs -0.5 to +(Vcc +0.5) V
DC Output Current – Outputs 24 mA
DC Output Current – Low Impedance Bidirectionals 24 mA
Power Dissipation (VCC = 5.25V) 500 mW
Electrostatic Discharge Voltage (Human Body Model) (I < 1uA) +/- 3000 V
Latch Up Current (Vi = +/- 10V maximum, for 10 ms) +/-200 mA
*** Note 5 - If devices are stored out of the packaging beyond this time limit the devices should be baked before use.
The devices should be ramped up to a temperature of 110oC and baked for 8 to 10 hours.
6.1 D.C. Characteristics
DC Characteristics ( Ambient Temperature = 0 to 70oC )
Operating Voltage and Current
Parameter Description Min Typ Max Units Conditions
Vcc1 VCC Operating Supply Voltage 4.35 5.0 5.25 V
Vcc2 VCCIO Operating Supply Voltage 3.0 - 5.25 V
Icc1 Operating Supply Current - 25 - mA Normal Operation
Icc2 Operating Supply Current - 100 200 uA USB Suspend *** Note 6
***Note 6 – Supply current excludes the 200uA nominal drawn by the external pull-up resistor on USBDP.
FIFO Data / Control Bus IO Pin Characteristics ( VCCIO = 5.0V )
Parameter Description Min Typ Max Units Conditions
Voh Output Voltage High 3.2 4.1 4.9 V I source = 2mA
Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 2 mA
Vin Input Switching Threshold 1.3 1.6 1.9 V *** Note 7
VHys Input Switching Hysteresis 50 55 60 mV
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 14 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
FIFO Data / Control Bus IO Pin Characteristics ( VCCIO = 3V to 3.6V )
Parameter Description Min Typ Max Units Conditions
Voh Output Voltage High 2.2 2.7 3.2 V I source = 2mA
Vol Output Voltage Low 0.3 0.4 0.5 V I sink = 4 mA
Vin Input Switching Threshold 1.0 1.2 1.5 V *** Note 7
VHys Input Switching Hysteresis 20 25 30 mV
***Note 7 – Inputs or IO Pins in Input Mode have an internal 200K pull-up resistor to VCCIO.
XTIN / XTOUT Pin Characteristics
Parameter Description Min Typ Max Units Conditions
Voh Output Voltage High 4.0 - 5.0 V Fosc = 6MHz
Vol Output Voltage Low 0.1 - 1.0 V Fosc = 6MHz
Vin Input Switching Threshold 1.8 2.5 3.2 V
RESET#, TEST, EECS, EESK, EEDATA, IO Pin Characteristics
Parameter Description Min Typ Max Units Conditions
Voh Output Voltage High 3.2 4.1 4.9 V I source = 2mA
Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 2 mA
Vin Input Switching Threshold 1.3 1.6 1.9 V *** Note 8
VHys Input Switching Hysteresis 50 55 60 mV
***Note 8 – EECS, EESK and EEDATA pins have an internal 200K pull-up resistor to VCC
RSTOUT Pin Characteristics
Parameter Description Min Typ Max Units Conditions
Voh Output Voltage High 3.0 - 3.6 V I source = 2mA
Vol Output Voltage Low 0.3 - 0.6 V I sink = 2 mA
USB IO Pin Characteristics
Parameter Description Min Typ Max Units Conditions
UVoh IO Pins Static Output ( High) 2.8 3.6 V RI = 1.5K to 3V3Out ( D+ )
RI = 15K to GND ( D- )
UVol IO Pins Static Output ( Low ) 0 0.3 V RI = 1.5K to 3V3Out ( D+ )
RI = 15K to GND ( D- )
UVse Single Ended Rx Threshold 0.8 2.0 V
UCom Differential Common Mode 0.8 2.5 V
UVDif Differential Input Sensitivity 0.2 V
UDrvZ Driver Output Impedance 29 44 Ohm *** Note 9
Note 9 – Driver Output Impedance includes the external 27R series resistors on USBDP and USBDM pins.
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 15 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
7.0 Device Configuration Examples
7.1 Oscillator Configurations
Figure 4
3 Pin Ceramic Resonator Configuration
Figure 5
Crystal or 2-Pin Ceramic Resonator
Configuration
Figure 4 illustrates how to use the FT245BL with a 3-Pin Ceramic Resonator. A suitable part would be a ceramic
resonator from Murata’s CERALOCK range. (Murata Part Number CSTCR6M00G15), or equivalent. 3-Pin ceramic
resonators have the load capacitors built into the resonator so no external loading capacitors are required. This
makes for an economical configuration. The accuracy of this Murata ceramic resonator is +/- 0.1% and it is specifically
designed for USB full speed applications. A 1 MOhm loading resistor across XTIN and XTOUT is recommended in
order to guarantee this level of accuracy.
Other ceramic resonators with a lesser degree of accuracy ( typically +/- 0.5% ) are technically outwith the USB
specification, but it has been calculated that using such a device will work satisfactorily in practice with a FT245BL
design.
Figure 5 illustrates how to use the FT245BL with a 6MHz Crystal or 2-Pin Ceramic Resonator. In this case, these
devices do not have in-built loading capacitors so these have to be added between XTIN, XTOUT and GND as
shown. A value of 27pF is shown as the capacitor in the example – this will be good for many crystals and some
resonators but do select the value based on the manufacturers recommendations wherever possible. If using a crystal,
use a parallel cut type. If using a resonator, see the previous note on frequency accuracy.
XTIN
XTOUT
27
28
FT245BM
3-Pin Resonator
6MHz
1M
XTIN
XTOUT
27
28
FT245BM
2 - Pin Resonator
or Crystal
6MHz
27pF
27pF
FT245BL
FT245BL FT245BL
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 16 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
7.2 EEPROM Configuration
Figure 6
EEPROM Configuration
Figure 6 illustrates how to connect the FT245BL to the 93C46
(93C56 or 93C66) EEPROM. EECS (pin 32) is directly
connected to the chip select (CS) pin of the EEPROM. EESK
(pin 1) is directly connected to the clock (SK) pin of the
EEPROM. EEDATA (pin 2) is directly connected to the Data
In (Din) pin of the EEPROM. There is a potential condition
whereby both the Data Output (Dout) of the EEPROM
can drive out at the same time as the EEDATA pin of the
FT245BL. To prevent potential data clash in this situation,
the Dout of the EEPROM is connected to EEDATA of the
FT245BL via a 2.2 K resistor.
Following a power-on reset or a USB reset, the FT245BL will
scan the EEPROM to find out a) if an EEPROM is attached
to the Device and b) if the data in the device is valid. If both
of these are the case, then the FT245BL will use the data in
the EEPROM, otherwise it will use its built-in default values.
When a valid command is issued to the EEPROM from the
FT245BL, the EEPROM will acknowledge the command by
pulling its Dout pin low. In order to check for this condition,
it is necessary to pull Dout high using a 10K resistor. If the
command acknowledge doesn’t happen then EEDATA will be
pulled high by the 10K resistor during this part of the cycle
and the device will detect an invalid command or no EEPROM
present.
There are two varieties of these EEPROM’s on the market – one is configured as being 16 bits wide, the other is
configured as being 8 bits wide. These are available from many sources such as Microchip, ST Micro, ISSI etc. The
FT245BL requires EEPROM’s with a 16-bit wide configuration such as the Microchip 93LC46B device. The EEPROM
must be capable of reading data at a 1Mb clock rate at a supply voltage of 4.35V to 5.25V. Most available parts are
capable of this.
Check the manufacturers data sheet to find out how to connect pins 6 and 7 of the EEPROM. Some devices specify
these as no-connect, others use them for selecting 8 / 16 bit mode or for test functions. Some other parts have their
pinout rotated by 90o so please select the required part and its options carefully.
It is possible to “share” the EEPROM between the FT245BL and another external device such as an MCU. However,
this can only be done when the FT245BL is in its reset condition as it tri-states its EEPROM interface at that time. A
typical configuration would use four bits of an MCU IO Port. One bit would be used to hold the FT245BL reset (using
RESET#) on power-up, the other three would connect to the EECS, EESK and EEDATA pins of the FT245BL in
order to read / write data to the EEPROM at this time. Once the MCU has read / written the EEPROM, it would take
RESET# high to allow the FT245BL to configure itself and enumerate over USB.
EECS
EEDATA
32
FT245BM
EESK
1
2
2
CS
SK
DIN
DOUT GND
NC
NC
VCC
EEPROM - 93C46 / 56 / 66
1
3
4 5
6
7
8
VCC
10k
2k2
VCC
FT245BL
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 17 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
VCC
27R
USB "B"
Connector
27R
USB DM
RSTOUT#
8
FT245BM
USB DP
7
5
V
C
C
V
C
C
V
C
C
I
O
3 26 13
1
2
3
4
Ferrite Bead
1k5
33nF
3v3OUT
6
470R
A
V
C
C
30 0.1uF
G
N
D
G
N
D
A
G
N
D
9 17 29
10nF
VCC
RESET#
4
Decoupling Capacitors
10uF
VCC
0.1uF 0.1uF
+
7.3 USB Bus Powered and Self Powered Configuration
Figure 7
USB Bus Powered Configuration
Figure 7 illustrates a typical USB bus powered configuration. A USB Bus Powered device gets its power from the USB
bus. Basic rules for USB Bus power devices are as follows –
a) On plug-in, the device must draw no more than 100mA
b) On USB Suspend the device must draw no more than 500uA.
c) A Bus Powered High Power Device (one that draws more than 100mA) should use the PWREN# pin to keep the
current below 100mA on plug-in and 500uA on USB suspend.
d) A device that consumes more than 100mA can not be plugged into a USB Bus Powered Hub
e) No device can draw more that 500mA from the USB Bus.
The power descriptor in the EEPROM should be programmed to match the current draw of the device.
A Ferrite Bead is connected in series with USB power to prevent noise from the device and associated circuitry (EMI)
being radiated down the USB cable to the Host. The value of the Ferrite Bead depends on the total current required by
the circuit – a suitable range of Ferrite Beads is available from Steward (www.steward.com) for example Steward Part
# MI0805K400R-00 also available as DigiKey Part # 240-1035-1.
FT245BL
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 18 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
Figure 8
USB Self Powered Configuration
Figure 8 illustrates a typical USB self powered configuration. A USB Self Powered device gets its power from its own
POWER SUPPLY and does not draw current from the USB bus. The basic rules for USB Self power devices are as
follows –
a) A Self-Powered device should not force current down the USB bus when the USB Host or Hub Controller is
powered down.
b) A Self Powered Device can take as much current as it likes during normal operation and USB suspend as it has its
own POWER SUPPLY.
c) A Self Powered Device can be used with any USB Host and both Bus and Self Powered USB Hubs
The USB power descriptor option in the EEPROM should be programmed to a value of zero (self powered).
To meet requirement a) the 1.5K pull-up resistor on USBDP is connected to RSTOUT# as per the bus-power circuit.
However, the USB Bus Power is used to control the RESET# Pin of the FT245BL device. When the USB Host or Hub
is powered up RSTOUT# will pull the 1.5K resistor on USB DP to 3.3V, thus identifying the device as a full speed
device to USB. When the USB Host or Hub power is off, RESET# will go low and the device will be held in reset. As
RESET# is low, RSTOUT# will also be low, so no current will be forced down USBDP via the 1.5K pull-up resistor
when the host or hub is powered down. Failure to do this may cause some USB host or hub controllers to power up
erratically.
Note : When the FT245BL is in reset, the FIFO interface pins all go tri-state. These pins have internal 200K pull-up
resistors to VCCIO so they will gently pull high unless driven by some external logic.
VCC
27R
USB "B"
Connector
27R
USB DM
RSTOUT#
8
FT245BM
USB DP
7
5
V
C
C
V
C
C
V
C
C
I
O
3 26 13
1
2
3
4
1k5
33nF
3v3OUT
6
470R
A
V
C
C
30 0.1uF
G
N
D
G
N
D
A
G
N
D
9 17 29
RESET#
4
10k
4k7
Decoupling Capacitors
10uF
VCC
0.1uF 0.1uF
+
FT245BL
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 19 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
Figure 9
Bus Powered Circuit with 3.3V logic drive / supply voltage
Ferrite Bead 470R
0.1uF
VCC
27R
USB "B"
Connector
27R
USB DM
8
FT245BM
USB DP
7
V
C
C
V
C
C
V
C
C
I
O
3 26 13
1
2
3
4
33nF
3v3OUT
6
A
V
C
C
30
10nF
0.1uF
In Out
Gnd
3.3v LDO Regulator 3.3v Power to External
Logic
Figure 9 shows how to configure the FT245BL to interface with a 3.3V logic device. In this example, a discrete
3.3V regulator is used to supply the 3.3V logic from the USB supply. VCCIO is connected to the output of the 3.3V
regulator, which in turn will cause the FIFO interface IO pins to drive out at 3.3V level. For USB bus powered circuits
some considerations have to be taken into account when selecting the regulator –
a) The regulator must be capable of sustaining its output voltage with an input voltage of 4.35 volts. A Low Drop Out
(LDO) regulator must be selected.
b) The quiescent current of the regulator must be low in order to meet the USB suspend total current requirement of
<= 500uA during USB suspend.
An example of a regulator family that meets these requirements is the MicroChip (Telcom) TC55 Series. These
devices can supply up to 250mA current and have a quiescent current of under 1uA.
In some cases, where only a small amount of current is required (< 5mA) , it may be possible to use the in-built
regulator of the FT245BL to supply the 3.3V without any other components being required. In this case, connect
VCCIO to the 3V3OUT pin of the FT245BL.
Note : It should be emphasised that the 3.3V supply for VCCIO in a bus powered design with a 3.3V logic interface
should come from an LDO which is supplied by USB bus, or from the 3V3OUT pin of the FT245BL, and not from any
other source.
FT245BL
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 20 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
Figure 10
Self Powered Circuit with 3.3 V logic drive / supply voltage
Figure 10 is an example of a USB self powered design with 3.3V interface. In this case VCCIO is supplied by an
external 3.3V supply in order to make the device IO pins drive out at 3.3V logic level, thus allowing it to be connected
to a 3.3V MCU or other external logic. A USB self powered design uses its own power supplies, and does not draw
any of its power from the USB bus. In such cases, no special care need be taken to meet the USB suspend current
(0.5 mA) as the device does not get its power from the USB port.
As with bus powered 3.3V interface designs, in some cases, where only a small amount of current is required (<5mA),
it may be possible to use the in-built regulator of the FT245BL to supply the 3.3V without any other components being
required. In this case, connect VCCIO to the 3v3OUT pin of the FT245BL.
Note that if SI/WU is not being used it should be pulled up to VCCIO.
VCC5V
27R
USB "B"
Connector
27R
USB DM
RSTOUT#
8
FT245BM
USB DP
7
5
V
C
C
I
O
13
1
2
3
4
1K5
33nF 3v3OUT
6
0.1uF
G
N
D
G
N
D
A
G
N
D
9 17 29
RESET#
4
10K
4K7
Decoupling Capacitors
10uF
VCC5V
0.1uF 0.1uF
+
VCC3V
VCC3V
SI/WU
V
C
C
V
C
C
3 26
470R
A
V
C
C
30
11
FT245BL
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 21 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
Figure 11
Bus Powered Circuit with Power Control
USB Bus powered circuits need to be able to power down in USB suspend mode in order to meet the <= 500uA total
suspend current requirement (including external logic). Some external logic can power itself down into a low current
state by monitoring the PWREN# pin. For external logic that cannot power itself down in that way, the FT245BL
provides a simple but effective way of turning off power to external circuitry during USB suspend.
Figure 11 shows how to use a discrete P-Channel Logic Level MOSFET to control the power to external logic
circuits. A suitable device could be a Fairchild NDT456P, or International Rectifier IRLML6402, or equivalent. It is
recommended that a “soft start” circuit consisting of a 1K series resistor and a 0.1 uF capacitor are used to limit the
current surge when the MOSFET turns on. Without the soft start circuit there is a danger that the transient power
surge of the MOSFET turning on will reset the FT245BL, or the USB host / hub controller. The values used here
allow attached circuitry to power up with a slew rate of ~12.5 V per millisecond, in other words the output voltage will
transition from GND to 5 V in approximately 400 microseconds.
Alternatively, a dedicated power switch I.C. with inbuilt “soft-start” can be used instead of a MOSFET. A suitable
power switch i.c. for such an application would be a Micrel (www.micrel.com) MIC2025-2BL or equivalent.
Please note the following points in connection with power controlled designs –
a) The logic to be controlled must have its own reset circuitry so that it will automatically reset itself when power is re-
applied on coming out of suspend.
b) Set the Pull-down on Suspend option in the FT245BL’s EEPROM.
c) For USB high-power bus powered device (one that consumes greater than 100 mA, and up to 500 mA of current
from the USB bus), the power consumption of the device should be set in the max power field in the EEPROM.
A high-power bus powered device must use this descriptor in the EEPROM to inform the system of its power
requirements.
d) For 3.3V power controlled circuits VCCIO must not be powered down with the external circuitry (PWREN# gets
its VCC supply from VCCIO). Either connect the power switch between the output of the 3.3V regulator and the
external 3.3V logic OR if appropriate power VCCIO from the 3v3OUT pin of the FT245BL.
Ferrite Bead 470R
0.1uF
VCC
27R
USB "B"
Connector
27R
USB DM
8
FT245BM
USB DP
7
V
C
C
V
C
C
V
C
C
I
O
3 26 13
1
2
3
4
33nF
3v3OUT
6
A
V
C
C
30
10nF
PWREN# 15
0.1uF
Switched 5v Power to
External Logic
P-Channel Power
MOSFET
s
g
d
0.1uF
1K
Soft Start
Circuit
FT245BL
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 22 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
Figure 12
Microprocessor Interface Example
Figure 12 illustrates a typical interface between the FT245BL and a MicroController (MCU). This examples uses two
IO Ports of the MCU, one port (8 bits) to transfer data and the other port (4 / 5 bits) to monitor the TXE# and RXF#
status bits and generate the RD# and WR strobes to the FT245BL as required. Optionally, SI / WU can be connected
to another IO pin if this function is required. If the SI / WU function is not required, tie this pin of the FT245BL to
VCCIO. If the MCU is handling power management functions, then PWREN# should also be connected to an IO pin of
the MCU.
The 8 data bits of Port 1 can be shared with other peripherals when the MCU is not accessing the FT245BL.
FT245BL
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 23 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
8.0 Document Revision History
DS245B Version 1.0 – Initial document created 8th August 2002.
DS245B Version 1.1 – Updated 23 October 2003
• Pin and package naming made consistent throughout data sheet.
• Section 1.0 Corrected data transfer rate for VCP drivers.
• Section 1.0 Amended to reflect availability of Mac OS X drivers.
• Section 1.1 Description of behaviour of TXE# and RXF# amended.
• Section 3.1 Minor changes to functional block descriptions.
• Section 2.0 Compatible EEPROM configurations corrected.
• Section 4.1 SI/WU Pin description amended.
• Section 4.1 RSTOUT# Pin description amended.
• Section 4.1 EEPROM interface Pin descriptions amended.
• Section 4.1 Note 2 should have referred to VCCIO, not VCC.
• Section 4.1 FIFO timing diagram amended.
• Section 6.1 Minimum Operating supply voltage adjusted.
• Section 7.1 Updated recommended ceramic resonator part number and circuit configuration.
• Section 7.3 “USB Self Powered Configuration (1)” (original Figure 8) removed. Recommended circuit for USB self powered designs updated.
• Section 7.3 Self Powered Circuit with 3.3V logic drive / supply voltage added (new figure 8).
• Section 7.3 Figure 11 Bus powered circuit with power control updated to add soft start circuit on MOSFET. Circuit description amended.
DS245B Version 1.2 – Updated 20 November 2003.
• Section 6.1 FIFO Data control Bus IO pin characteristics amended
• Section 6.1 RESET#, TEST, EECS, EESK, and EEDATA pin characteristics amended.
• Section 6.1 RSTOUT# pin characteristics amended.
DS245B Version 1.3 – Updated 10 December 2003
• Section 5.0 Package drawing amended.
• Section 6.0 Floor Life / Relative Humidity specification added. ESD and Latch Up specifications amended.
• Section 7.1 Required accuracy of crystal / resonator corrected.
DS245B Version 1.4 – Updated 10 February 2004
• Grammar Corrections.
• Section 10.0 FTDI Address Updated
• Section 4.1 VCCIO Pin description ammended.
DS245B Version 1.5 – Updated March 2004
• Section 4.1 FIFO EESK Pin Description amended.
• Section 4.1 FIFO WR timings and diagram amended.
• Section 7.3 Figure 10 SI/WU Pin number corrected
• Section 7.3 Figure 11 PWREN# Pin number corrected
DS245B Version 1.6 – Updated February 2005
• Section 1 - Win CE VCP drivers now available
• Section 1 - D2XX drivers for Win CE and Linux now available
• Section 5 FT245BL (lead free) and FT245BQ (lead free QFN package) now available
DS245B Version 1.6 – Updated February 2005
• Section 1 - Driver OS availabillity updated
• Section 6.1 - USB Data line absolute maximum rating added.
DS245BL Version 1.7 © Future Technology Devices Intl. Ltd. 2005 Page 24 of 24
FT245BL USB FIFO ( USB - Parallel ) I.C.
Website URL : http://www.ftdichip.com
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At the time of writing our Sales Network covers over 40 different countries world-wide. Please visit the Sales Network
page of our Web Site for the contact details our distributor(s) in your country.
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(Taiwan)
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9.0 Disclaimer
© Future Technology Devices International Limited , 2005
Neither the whole nor any part of the information contained in, or the product described in this manual, may be
adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder.
This product and its documentation are supplied on an as-is basis and no warranty as to their suitability for any
particular purpose is either made or implied.
Future Technology Devices International Ltd. will not accept any claim for damages howsoever arising as a result of
use or failure of this product. Your statutory rights are not affected.
This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure
of the product might reasonably be expected to result in personal injury.
This document provides preliminary information that may be subject to change without notice.
10.0 Contact Information
Head Office -
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373 Scotland Street,
Glasgow G5 8QB,
United Kingdom
Tel. : +(44) 141 429 2777
Fax. : +(44) 141 429 2758
E-Mail (Sales) : sales1@ftdichip.com
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