MAX14895E
Enhanced VGA Port Protector
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General Description
The MAX14895E integrates level-translating buffers and
features RED, GRN, and BLU (RGB) port protection for
VGA signals.
The device has horizontal sync (SYNCH_) and vertical
sync (SYNCV_) translating buffers that convert low-level
CMOS inputs from a graphics controller to meet full 5V,
TTL-compatible outputs. Each output can drive Q10mA
and meets the VESASM specification. In addition, the
device translates the direct digital control (DDC) signals
to a lower level that is safe for the graphics controller.
The device features both EN and EN inputs, accepting
active-high or active-low enable inputs. The device also
switches and current limits the 5V supply to a VGA con-
nector or monitor.
The RED, GRN, and BLU terminals protect graphics con-
troller outputs against electrostatic discharge (ESD) events.
All eight outputs and EN have high-level ESD protection.
The MAX14895E is specified over the extended -40NC to
+85NC temperature range and is available in a 16-pin,
3mm x 3mm TQFN package with exposed pad.
Applications
Benefits and Features
S Saves Power in Portable Applications
Low Quiescent Supply Current: 430µA (typ)
S Eliminates Need for Costly External Components
High-ESD Protection on SDA1, SCL1, SYNCH1,
SYNCV1, RED, GRN, BLU, EN, VS
±15kV Human Body Model (HBM)
±8kV IEC 61000-4-2 Contact Discharge
S Innovative Design Enables a High Level of
Integration for Performance
Output Current-Limit Switch with Power-Off
Protection
Low Capacitance on RGB Ports (2.2pF typ)
±10mA Drive on SYNCH1, SYNCV1
S Fully Integrated Solutions Saves Space in Portable
Applications
DDC Outputs have Internal Pullups
3mm x 3mm, 16-Pin TQFN Package
Typical Operating Circuit
19-5819; Rev 0; 3/11
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX14895E.related.
Notebook Computers
Desktops
Servers
Graphics Cards
VESA is a service mark of the Video Electronics Standards Association Corporation.
EVALUATION KIT AVAILABLE
MAX14895E
+5V
VCC VSEN
GND
1µF
1µF
EN
SYNCH0, SYNCV0
VGA
OUTPUTS
VGA
PORT
2
SDA0, SCL0
RED
GRN
BLU
SYNCH1, SYNCV1
SDA1, SCL1
2
2
2
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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MAX14895E
Enhanced VGA Port Protector
(Voltages referenced to GND.)
VCC, VS, EN, SDA0, SCL0 ......................................-0.3V to +6V
SDA1, SCL1 ................................................ -0.3V to (VS + 0.3V)
EN, RED, GRN, BLU, SYNCH0,
SYNCH1, SYNCV0, SYNCV1 ................ -0.3V to (VCC + 0.3V)
Continuous Current through SDA_, SCL_ ....................... Q30mA
Continuous Short-Circuit Current SYNCH1, SYNCV1 ..... Q20mA
Continuous Power Dissipation (TA = +70NC)
TQFN (derate 20.8mW/NC above +70NC)..................1667mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range ............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
TQFN
Junction-to-Ambient Thermal Resistance (BJA) ..........48NC/W
Junction-to-Case Thermal Resistance (BJC) .................7NC/W
ABSOLUTE MAXIMUM RATINGS
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
ELECTRICAL CHARACTERISTICS
(VCC = +4.75V to +5.25V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY
Power-Supply Range VCC 4.75 5.25 V
Quiescent Supply Current IQ
EN = VCC, EN = GND,
SYNCH0 = SYNCV0 = GND,
SDA0 = SCL0 = unconnected
430 800 FA
Shutdown Supply Current ISHDN
EN = GND, EN = VCC,
SYNCH0 = SYNCV0 = GND,
SDA0 = SCL0 = unconnected
8FA
Undervoltage Lockout Threshold VUVLO VCC rising 4.3 V
Undervoltage Lockout Hysteresis 0.1 V
Internal Logic Supply Voltage VL
VCC = +4.75V to +5.25V, SDA1/SCL1 =
unconnected, measure SDA0/SCL0 1.6 2.9
V
VCC = +4.75V to +5.25V, SDA0/SCL0 =
200kI to GND, measure SDA0/SCL0,
SDA1/SCL1 = unconnected
1.6 2.8
RED, GRN, BLU
RED, GRN, BLU Capacitance COUT f = 1MHz, VRED, GRN, BLU = 1VP-P 2.2 pF
RED, GRN, BLU Leakage Current -1 +1 FA
SYNCH0, SYNCV0, EN, EN
Input Logic-High VIH 2.0 V
Input Logic-Low VIL 0.8 V
*The parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet.
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MAX14895E
Enhanced VGA Port Protector
Note 2: All devices are 100% production tested at TA = +25NC. Limits over the operating temperature range are guaranteed by
design and not production tested.
Note 3: Guaranteed by design.
ELECTRICAL CHARACTERISTICS* (continued)
(VCC = +4.75V to +5.25V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SYNCH0, SYNCV0 Leakage
Current SYNCH0/SYNCV0 = GND or VCC -1 +1 FA
EN, EN Input Resistance EN = VCC, EN = GND 200 800 kI
SYNCH1, SYNCV1
Output Logic-High VOH VCC = +4.75V, source 10mA 2.4 V
Output Logic-Low VOL VCC = +4.75V, sink 10mA 0.5 V
Rising Time tRRL = 2.2kI, CL = 10pF, 10% to 90% of VCC
(Note 3) 4 ns
Falling Time tFRL = 2.2kI, CL = 10pF, 90% to 10% of VCC
(Note 3) 4 ns
Propagation Delay tPD RL = 2.2kI, CL = 10pF, EN = VCC, EN =
GND (Figure 1)16 ns
Enable Time tEN RL = 2.2kI, CL = 10pF, VSYNCH1, VSYNCV1
= +4.75V (Figure 1)17 Fs
SDA�, SCL� (DDC)
On-Resistance RON VSDA0 = VSCL0 = 0.5V, ILOAD = 10mA 55 I
SDA0, SCL0 Off-Leakage Current EN = GND, EN = VCC,
SDA0 = SCL0 = VCC, SDA1 = SCL1 = GND -1 +1 FA
SDA1, SCL1 Reverse-Leakage
Current
VCC = 0V, VS = +5.25V,
VSDA1 = VSCL1 = +5.25V -10 +10 FA
SDA1, SCL1 Pullup Resistor RPULLUP
VCC = +4.75V, SDA0 = SCL0 =
unconnected, EN = VCC , EN = GND,
ILOAD = 100FA
1.25 2.5 4.0 kI
VS OUTPUT
Forward Voltage Drop ILOAD = 60mA, VCC = 5V 0.25 V
Reverse-Leakage Current VCC = 0V, VS = 5.25V 10 FA
Current Limit ILIM 200 600 mA
Discharge Resistor RVS ILOAD = 1mA 300 500 I
THERMAL SHUTDOWN
Thermal Shutdown Threshold +150 NC
Thermal Shutdown Hysteresis 10 NC
ESD PROTECTION
SDA1, SCL1, SYNCH1, SYNCV1,
RED, GRN, BLU, EN, VS
HBM ±15 kV
IEC 61000-4-2 Contact ±8 kV
*The parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet.
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MAX14895E
Enhanced VGA Port Protector
Figure 1. Timing Diagram
50%
50%
50%
50%
tPHL
tPD = MAX(tPLH, tPHL)
2.4V
0V
OUTPUT HIGH
OUTPUT LOW
2.4V
2.4V
0V
0V
OUTPUT HIGH
OUTPUT LOW
VSYNCH0/VSYNCV0
VEN
VEN
VSYNCH1/VSYNCV1
VSYNCH1/VSYNCV1
50%
50%
50%
tPLH
tEN
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MAX14895E
Enhanced VGA Port Protector
Typical Operating Characteristics
(VCC = +5V, TA = +25NC, unless otherwise noted.)
ON-RESISTANCE vs. SDA0 VOLTAGE
MAX14895E toc01
VSDA0 (V)
RON (Ω)
2.52.00.5 1.0 1.5
10
20
30
40
50
60
70
80
0
0 3.0
SDA0, SCL0 ARE
INTERCHANGEABLE
TA = -40°C
TA = +25°C
TA = +85°C
HV BUFFER OUTPUT-VOLTAGE HIGH
vs. TEMPERATURE
MAX14895E toc02
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
603510-15
4.2
4.4
4.6
4.8
5.0
5.2
5.4
5.6
5.8
6.0
4.0
-40 85
IOUT = 8mA
HV BUFFER OUTPUT-VOLTAGE LOW
vs. TEMPERATURE
MAX14895E toc03
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
603510-15
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
-40 85
IOUT = 8mA
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MAX14895E
Enhanced VGA Port Protector
Pin Configuration
Pin Description
PIN NAME FUNCTION
1 RED High-ESD Protection Diodes for RGB Signals
2 GRN High-ESD Protection Diodes for RGB Signals
3 BLU High-ESD Protection Diodes for RGB Signals
4 GND Ground
5 VS
Supply Voltage Output with Current-Limit Switch. VS provides a current-limited voltage from VCC when the
device is enabled. Bypass VS to GND with a 1FF or larger ceramic capacitor as close as possible to the device.
6EN Active-Low Enable Input. Drive EN high and EN low to disable the device. EN is weakly pulled up internally.
7 SDA0 DDC Data Input from Graphics Controller
8 SDA1 DDC Data Output to VGA Monitor. Internally pulled up to VCC.
9 SCL0 DDC Clock Input from Graphics Controller
10 SCL1 DDC Clock Output to VGA Monitor. Internally pulled up to VCC.
11 SYNCH0 Horizontal Sync Input
12 SYNCH1 Horizontal Sync Output
13 SYNCV0 Vertical Sync Input
14 SYNCV1 Vertical Sync Output
15 VCC
Supply Voltage Input. Apply a voltage between +4.75V and +5.25V to VCC to power the device. Bypass VCC
to GND with a 1FF or larger ceramic capacitor as close as possible to the device.
16 EN Active-High Enable Input. Drive EN low and EN high to disable the device. EN is weakly pulled down internally.
— EP Exposed Pad. Connect EP to GND. For enhanced thermal dissipation, connect EP to a large ground plane.
Do not use EP as the only ground connection.
15
16
14
13
5
6
7
BLU
GND
8
RED
SCL1
SCL0
SYNCH1
1 3
SYNCV1
4
12 10 9
VCC
EN *EP
*CONNECT EP TO GND.
SDA1
SDA0
EN
VS
GRN SYNCH0
2
11
SYNCV0
TQFN
(3mm x 3mm)
TOP VIEW
+
MAX14895E
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MAX14895E
Enhanced VGA Port Protector
Functional Diagram/Truth Table
MAX14895E
CURRENT-LIMIT
SWITCH
VCC
EN
EN
SDA0
SCL0
SDA1
VS
SCL1
SYNCH0 SYNCH1
LOGIC
THERMAL
SHUTDOWN
HIGH ESD
RPULLUP RPULLUP
RVS
SDA/SCL PULLUP
RESISTOR
SWITCHES
VS PULLUP-TO-GND
SWITCHES
I2C LEVEL SHIFTER
HIGH ESD
HIGH ESD
HIGH ESD
HIGH ESD
HIGH ESD
HIGH ESD
GND
SYNCV0
RED
HIGH ESD
GRN
HIGH ESD
BLU
SYNCV1
DEVICE LOGICENEN
Enable00
Disable10
Enable
Enable
01
Disable Output 0V
DEVICE LOGIC/
EVENT
SYNCH_/SYNCV_
BUFFER
Enable
No Overcurrent
I2C LEVEL
SHIFTER
On
CURRENT-LIMIT
SWITCH
On
SDA/SCL PULLUP
RESISTOR SWITCHES
On
VS PULL-TO-GND
SWITCH
OffOn
Enable
Overcurrent On Current Limit On OffOn
Enable
Overcurrent
Thermal Shutdown
Off Off Off On
Off Off Off On
VCC = 0V Off Off Off Off Off
Output 0V
11
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MAX14895E
Enhanced VGA Port Protector
Detailed Description
The MAX14895E integrates level-translating buffers and
features RED, GRN, and BLU port protection for VGA sig-
nals. Horizontal and vertical synchronization (SYNCH0,
SYNCV0) inputs feature level-shifting buffers to support
low-voltage CMOS or standard TTL-compatible graphics
controllers. Each output can drive Q10mA and meets
VESA specifications. The device also features I2C level
shifting using two nMOS devices.
The device generates its own internal bias supply to
clamp SCL0 and SDA0 to a safe level, removing the need
for another external supply. The device also provides a
current-limited VCC output with power-off protection. This
output can be used to switch power to a VGA connector
or the VGA interface of a monitor.
Horizontal/Vertical Sync Level Shifter
SYNCH0 and SYNCV0 are buffered to provide level shift-
ing and drive capability to meet the VESA specification.
The level-shifted outputs (SYNCH1, SYNCV1) are pulled
low when EN is low and EN is high, or when the device
is in thermal shutdown (see the Functional Diagram/
Truth Table). Logic-level outputs (VOL, VOH) are 5V TTL-
compatible. These two buffers are identical and each
can drive either the horizontal or the vertical synch signal.
Display Data Channel Switches
The device incorporates two nMOS switches for I2C
level shifting. The SDA0 and SCL0 terminals are voltage
clamped to a diode drop less than the internal VL volt-
age. Voltage clamping provides protection and compat-
ibility with the SDA0 and SCL0 signals and low-voltage
ASICs. When power is off (VCC = 0V), SDA1 and SCL1
are protected against reverse-leakage current up to VS =
+5.25V. The SDA_ and SCL_ switches are identical, and
each switch can be used to route SDA_ or SCL_ signals.
RGB Ports
The device includes three terminals for RED, GRN, and
BLU signals. These terminals provide high-level ESD pro-
tection to the RGB lines while keeping the capacitance
on the RGB lines to a minimum. The RED, GRN, BLU
terminals are identical, and any of the three terminals
can be used to protect red, green, or blue video signals.
EN, EN
The device has dual complementary EN and EN enable
inputs and can accept either active-low or active-high
enable signals. Pull EN low and EN high to place the device
in shutdown (see the Functional Diagram/Truth Table).
VS Output
The device provides a current-limited voltage on VS when
the part is enabled. VS is used as the pullup voltage for
internal pullup resistors on SDA1 and SCL1, and can be
used as an external supply. The internal pullup resistors
from SDA1 and SCL1 to VS are active when the device is
enabled, and are disabled when the device is in thermal
shutdown (see the Functional Diagram/Truth Table).
The VS supply includes an internal resistor to discharge
the supply when the device is in thermal shutdown or is
disabled (see the Functional Diagram/Truth Table). VS is
current limited to prevent damage to host devices. When
power is off (VCC = 0V), VS is protected against reverse-
leakage current up to VS = +5.25V.
Thermal Shutdown
Thermal-shutdown circuitry protects the device from
overheating. The device enters thermal shutdown when
the junction temperature exceeds +150NC (typ) and
returns to normal operation when the temperature drops
by approximately +10NC (typ) below the thermal-shut-
down threshold. When the device is in thermal shutdown,
both SYNCH1 and SYNCV1 are pulled down to ground,
the I2C level shifters are disabled, the SDA1 and SCL1
pullups are off, and the VS discharge resistor is on (see
the Functional Diagram/Truth Table).
Applications Information
Power-Supply Decoupling
Bypass VCC and VS to ground with 1FF ceramic capaci-
tors as close as possible to the device.
PCB Layout
High-speed switches such as the MAX14895E require
proper PCB layout for optimum performance. Ensure that
impedance-controlled PCB traces for high-speed signals
are matched in length and are as short as possible.
Connect the exposed pad to a solid ground plane.
ESD Protection
As with all Maxim devices, ESD protection structures
are incorporated on all terminals to protect against elec-
trostatic discharges encountered during handling and
assembly. Additionally, the device is protected to Q15kV
on the RED, GRN, BLU, EN, VS, SYNCH1, SYNCV1,
SCL1, and SDA1 terminals by the HBM. For optimum
ESD performance, bypass VCC to ground with a 1FF
ceramic capacitor.
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MAX14895E
Enhanced VGA Port Protector
ESD protection can be tested in various ways. The RED,
GRN, BLU, EN, VS, SYNCH1, SYNCV1, SCL1, and SDA1
terminals of the device are characterized for protection to
the following limits:
• Q15kV using the HBM
• Q8kV using IEC 61000-4-2 Contact Discharge
Human Body Model
Figure 2 shows the HBM. Figure 3 shows the current
waveform it generates when discharged into a low-
impedance state. This model consists of a 100pF capaci-
tor charged to the ESD voltage of interest that is then
discharged into the device through a 1.5kI resistor.
IEC 61000-4-2
The IEC 6100-4-2 standard covers ESD testing and per-
formance of finished equipment. However, it does not
specifically refer to integrated circuits. The device assists
in designing equipment to meet IEC 61000-4-2 without
the need for additional ESD protection components.
The major difference between tests done using the HBM
and IEC 61000-4-2 is higher peak current in IEC 61000-
4-2 because series resistance is lower in the IEC 61000-
4-2 model. Hence, the ESD withstand voltage measured
to IEC 61000-4-2 is generally lower than that measured
using the HBM. Figure 4 shows the IEC 61000-4-2 model,
and Figure 5 shows the current waveform for the IEC
61000-4-2 ESD Contact Discharge test.
Figure 2. Human Body ESD Test Model
Figure 3. Human Body Current Waveform
Figure 4. IEC 61000-4-2 ESD Test Model
Figure 5. IEC 61000-4-2 ESD Generator Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
CS
100pF
RC
1MΩ
RD
1.5kΩ
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
100%
36.8%
tRL
TIME
tDL
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
00
IPEAK (AMPS)
90%
10%
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
CS
150pF
RC
50MΩ TO 100MΩ
RD
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
tR = 0.7ns TO 1ns
30ns
60ns
t
100%
90%
10%
IPEAK (AMPS)
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MAX14895E
Enhanced VGA Port Protector
Ordering Information
+Denotes lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PART TEMP RANGE PIN-PACKAGE
MAX14895EETE+T -40NC to +85NC16 TQFN-EP*
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
16 TQFN-EP T1633+4 21-0136 90-0031
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 11
© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX14895E
Enhanced VGA Port Protector
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 3/11 Initial release —
