1PS2012E 08/08/06
Pin Configuration
Inputs
OE T/R Outputs
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X High Z State
1. H = High Voltage Level, X = Don't Care, L = Low
Voltage Level, Z = High Impedance
Truth Table(1)
Pin Name Description
OE 3-State Output Enable Inputs (Active LOW)
T/R Transmit/Receive Input
A0-A7Side A Inputs or 3-State Outputs
B0-B7Side B Inputs or 3-State Outputs
GND Ground
VCC Power
Pin Description
Fast CMOS Octal Bidirectional Transceivers
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI74FCT245T
PI74FCT2245T (25ΩΩ
ΩΩ
Ω Series)
Block Diagram
Description
Pericom Semiconductor’s PI74FCT245T and PI74FCT2245T are
8-bit wide octal buffer bidirectional transceivers designed for
asynchronous two-way communication between data buses. The
transmit/receive (T/R) input determines the direction of data flow
through the bidirectional transceiver. Transmit (active HIGH) enables
data from A ports to B ports, and receive (active LOW) from B ports
to A ports. The output enable (OE) input, when HIGH, disables both
A and B ports by placing them in Hi-Z condition.
PI74FCT2245T has a built-in 25-ohm series resistor on all outputs to
reduce noise because of reflections, thus eliminating the need for an
external terminating resistor.
Features
• Pin compatible with bipolar FAST™ Series at a higher speed
and lower power consumption
• 25-ohm series resistor on all outputs (FCT2245Tonly)
• TTL input and output levels
• Low ground bounce outputs
• Extremely low static power
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Packaging (Pb-free & Green Available):
– 20-pin 173-mil wide plastic TSSOP (L)
– 20-pin 300-mil wide plastic SOIC (S)
– 20-pin 209-mil wide plastic SSOP (H)
– 20-pin 150-mil wide plastic QSOP (Q)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
Vcc
OE
B0
B1
B2
B3
B4
B5
B6
B7
A0
B0
OE
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
T/R
06-0207
2PS2012E 08/08/06
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI74FCT245T
PI74FCT2245T(25 Ohm Series )
Octal BidirectionalTransceivers
Storage Temperature .................................................................... –65°C to +150°C
Ambient Temperature with Power Applied .................................... –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & VCC Only) ............. –0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ........... –0.5V to +7.0V
DC Input Voltage ............................................................................ –0.5V to +7.0V
DC Output Current ...................................................................................... 120mA
Power Dissipation ..........................................................................................0.5W
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the device.
This is a stress rating only and functional operation
of the device at these or any other conditions above
those indicated in the operational sections of this
specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may
affect reliability.
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC = 5.0V ±5%)
Parameters Description Test Conditions(1) Min. Typ(2) Max. Units
VOH Output HIGH Voltage VCC = Min., VIN = VIH or VIL IOH = –15.0mA 2.4 3.0 V
VOL Output LOW Current VCC = Min., VIN = VIH or VIL IOL = 64mA 0.3 0.55 V
VOL Output LOW Current VCC = Min., VIN = VIH or VIL IOL = 12mA (25Ω Series) 0.3 0.50 V
VIH Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 V
VIL Input LOW Voltage Guaranteed Logic LOW Level 0.8 V
IIH Input HIGH Current (Except I/O pins) VCC = Max. VIN = VCC 1μA
IIL Input LOW Current (Except I/O pins) VCC = Max. VIN = GND –1 μA
IIH Input HIGH Current (I/O pins Only) VCC = Max. VIN = VCC 1μA
IIL Input LOW Current (I/O pins Only) VCC = Max. VIN = GND –1 μA
IOZH High Impedance VCC = MAX.V
OUT = 2.7V 1 μA
IOZL Output Current VOUT = 0.5V –1 μA
VIK Clamp Diode Voltage VCC = Min., IIN = –18 mA –0.7 –1.2 V
IOFF Power Down Disable VCC = GND, VOUT = 4.5V 100 μA
IOS Short Circuit Current VCC
= Max.(3), VOUT = GND –60 –120 mA
VHInput Hysteresis 200 mV
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(1) Description Test Conditions Typ. Max. Units
CIN Input Capacitance VIN = 0V 6 10 pF
COUT Output Capacitance VOUT = 0V 8 12 pF
Notes:
1. These Parameters are determined by device characterization but are not production tested.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
06-0207
3PS2012E 08/08/06
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI74FCT245T
PI74FCT2245T(25 Ohm Series )
Octal BidirectionalTransceivers
Power Supply Characteristics
Parameters Description Test Conditions(1) Min. Typ(2) Max. Units
ICC Quiescent Power VCC = Max. VIN = GND or VCC 0.1 500 μA
Supply Current
ΔICC Supply Current per VCC = Max., VIN = 3.4V(3) 0.5 2.0 mA
Input @ TTL HIGH
ICCD Supply Current per VCC = Max., VIN = VCC 0.15 0.25 mA/
Input per MHz(4) Outputs Open VIN = GND MHz
OE = GND
T/R = GND or VCC
One Input Toggling
50% Duty Cycle
ICTotal Power Supply VCC = Max., VIN
= VCC 1.5 3.5(5) mA
Current(6) Outputs Open VIN = GND
fI = 10 MHZ
50% Duty Cycle VIN = 3.4V 1.8 4.5(5)
T/R = OE = GND VIN = GND
One Bit Toggling
VCC = Max., VIN = VCC 3.0 6.0(5)
Outputs Open VIN = GND
fI = 2.5 MHZ
50% Duty Cycle VIN = 3.4V 5.0 14.0(5)
T/R = OE = GND VIN = GND
Eight Bits Toggling
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Per TTL driven input (VIN = 3.4V); all other inputs at VCC or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. IC =IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + DICC DHNT + ICCD (fCP/2 + fINI)
ICC = Quiescent Current
ΔICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fI = Input Frequency
NI = Number of Inputs at fI
All currents are in milliamps and all frequencies are in megahertz.
06-0207
4PS2012E 08/08/06
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI74FCT245T
PI74FCT2245T(25 Ohm Series )
Octal BidirectionalTransceivers
Switching Characteristics over Operating Range
245T/2245T 245AT/2245AT 245CT/2245CT 245DT
Com. Com. Com. Com.
Parameters Description Conditions(1) Min. Max. Min. Max. Min. Max. Min Max. Unit
tPLH Propagation Delay CL = 50 pF 1.5(1) 7.0 1.5(1) 4.6 1.5(1) 4.1 1.5(1) 3.8 n s
tPHL A to B, B to A RL
= 500-ohm
tPZH Output Enable Time(2) 1.5 9.0 1.5 6.2 1.5 5.8 1.5 5.0 n s
tPZL OE to A or B
tPHZ Output Disable Time(2) 1.5 7.5 1.5 5.0 1.5 4.8 1.5 4.3 n s
tPLZ OE to A or B
tPZH Output Enable Time(2) 1.5 9.0 1.5 6.2 1.5 5.8 1.5 5.0 n s
tPZL T/R to A or B
tPHZ Output Disable Time(2) 1.5 7.5 1.5 5.0 1.5 4.8 1.5 4.3 n s
tPLZ T/R to A or B
Notes:
1. Minimum limits are guaranteed but not tested on Propagation Delays.
2. This parameter is guaranteed but not production tested.
Packaging Mechanical: 20-pin SOIC (S)
SEATING
PLANE
.050
BSC
1
20
0-8˚
.2914
.2992
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
7.40
7.60
.496
.511
12.60
12.99
1.27
.0926
.1043
2.35
2.65 .394
.419
10.00
10.65
.0040
.0118
0.10
0.30
.013
.020
0.33
0.51
.010
.029
0.254
0.737
.0091
.0125
0.23
0.32
0.41
1.27
.016
.050
x 45˚
.020
.030
0.508
0.762 REF
06-0207
5PS2012E 08/08/06
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI74FCT245T
PI74FCT2245T(25 Ohm Series )
Octal BidirectionalTransceivers
Packaging Mechanical: 20-pin QSOP (Q)
Packaging Mechanical: 20-Pin TSSOP (L)
.337
.344
.053
.069
.004
.010
SEATING
PLANE
.025
BSC
.007
.010
.228
.244
.150
.157
1
20
.016
.050
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.635
8.56
8.74
1.35
1.75
5.79
6.19
0.41
1.27
0.101
0.254
.008
.012
0.203
0.305
3.81
3.99
0.178
0.254
.058
1.47
.015 x 45˚
0.38
REF
Detail A
Detail A
.008
0.20
MIN.
Guage Plane
.010
0.254
.041
1.04
REF
.016
.035
0.41
0.89
0˚-6˚
.008
.013
0.20
0.33
.252
.260
.047
1.20
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.238
.269
1
20
.169
.177
0.05
0.15
6.1
6.7
0.45
0.75
0.09
0.20
4.3
4.5
6.4
6.6
0.65 0.19
0.30
.007
.012
Max
06-0207
6PS2012E 08/08/06
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI74FCT245T
PI74FCT2245T(25 Ohm Series )
Octal BidirectionalTransceivers
Packaging Mechanical: 20-Pin SSOP (H)
.272
.295
.078
.002
SEATING
PLANE
.0098
Max.
.0256
BSC
.022
.037
.004
.009
.291
.322
1
20
.197
.220
0.25
0.050
7.40
8.20
0.55
0.95
0.09
0.25
5.00
5.60
2.00
6.90
7.50
0.65
Max
Min
PI74FCT245T Ordering Information
Ordering Code Package Code Speed Grade Package Type
PI74FCT245TQ Q Blank 20-pin QSOP
PI74FCT245TQE Q Blank Pb-free & Green, 20-pin QSOP
PI74FCT245TS S Blank 20-pin SOIC
PI74FCT245TSE S Blank Pb-free & Green, 20-pin SOIC
PI74FCT245ATLE L A Pb-free & Green, 20-pin TSSOP
PI74FCT245ATS S A 20-pin SOIC
PI74FCT245ATSE S A Pb-free & Green, 20-pin SOIC
PI74FCT245ATQ Q A 20-pin QSOP
PI74FCT245ATQE Q A Pb-free & Green, 20-pin QSOP
PI74FCT245CTH H C 20-pin SSOP
PI74FCT245CTHE H C Pb-free & Green, 20-pin SSOP
PI74FCT245CTS S C 20-pin SOIC
PI74FCT245CTSE S C Pb-free & Green, 20-pin SOIC
PI74FCT245CTQ Q C 20-pin QSOP
PI74FCT245CTQE Q C Pb-free & Green, 20-pin QSOP
PI74FCT245DTQ Q D 20-pin QSOP
PI74FCT245DTQE Q D Pb-free & Green, 20-pin QSOP
06-0207
7PS2012E 08/08/06
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI74FCT245T
PI74FCT2245T(25 Ohm Series )
Octal BidirectionalTransceivers
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
PI74FCT2245T Ordering Information
Ordering Code Package Code Speed Grade Package Type
PI74FCT2245TQ Q Blank 20-pin QSOP
PI74FCT2245TQE Q Blank Pb-free & Green, 20-pin QSOP
PI74FCT2245TS S Blank 20-pin SOIC
PI74FCT2245TSE S Blank Pb-free & Green, 20-pin SOIC
PI74FCT2245ATS S A 20-pin SOIC
PI74FCT2245ATSE S A Pb-free & Green, 20-pin SOIC
PI74FCT2245ATQ Q A 20-pin QSOP
PI74FCT2245ATQE Q A Pb-free & Green, 20-pin QSOP
PI74FCT2245CTL L C 20-pin TSSOP
PI74FCT2245CTLE L C Pb-free & Green, 20-pin TSSOP
PI74FCT2245CTQ Q C 20-pin QSOP
PI74FCT2245CTQE Q C Pb-free & Green, 20-pin QSOP
PI74FCT2245DTSE S D Pb-free & Green, 20-pin SOIC
Notes:
•Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
•E = Pb-free & Green
•Adding an X suffix = Tape/Reel
06-0207
