19-5819; Rev 0; 3/11
EVALUATION KIT AVAILABLE
MAX14895E
Enhanced VGA Port Protector
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 VESA
SM
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.
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,
V
S
±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
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.
Applications
Notebook Computers
Desktops
Servers
Graphics Cards
Typical Operating Circuit
+5V
1µF
EN
EN
SYNCH0, SYNCV0
SDA0, SCL0
RED
GRN
BLU
V
CC
V
S
1µF
2
VGA
OUTPUTS
2
SYNCH1, SYNCV1
SDA1, SCL1
2
2
VGA
PORT
MAX14895E
GND
VESA is a service mark of the Video Electronics Standards Association Corporation.
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Maxim Integrated Products
1
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.
MAX14895E
Enhanced VGA Port Protector
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND.)
V
CC
, V
S
, EN, SDA0, SCL0 ......................................-0.3V to +6V
SDA1, SCL1 ................................................ -0.3V to (V
S
+ 0.3V)
EN,
RED, GRN, BLU, SYNCH0,
SYNCH1, SYNCV0, SYNCV1 ................ -0.3V to (V
CC
+ 0.3V)
Continuous Current through SDA_, SCL_ .......................
Q30mA
Continuous Short-Circuit Current SYNCH1, SYNCV1 .....
Q20mA
Continuous Power Dissipation (T
A
= +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
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)
TQFN
Junction-to-Ambient Thermal Resistance (B
JA
) ..........48NC/W
Junction-to-Case Thermal Resistance (B
JC
) .................7NC/W
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= +4.75V to +5.25V, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are at V
CC
= +5V, T
A
= +25NC.) (Note 2)
PARAMETER
POWER SUPPLY
Power-Supply Range
Quiescent Supply Current
V
CC
I
Q
EN = V
CC
,
EN
= GND,
SYNCH0 = SYNCV0 = GND,
SDA0 = SCL0 = unconnected
EN = GND,
EN
= V
CC
,
SYNCH0 = SYNCV0 = GND,
SDA0 = SCL0 = unconnected
V
CC
rising
0.1
V
CC
= +4.75V to +5.25V, SDA1/SCL1 =
unconnected, measure SDA0/SCL0
Internal Logic Supply Voltage
V
L
V
CC
= +4.75V to +5.25V, SDA0/SCL0 =
200kI to GND, measure SDA0/SCL0,
SDA1/SCL1 = unconnected
f = 1MHz, V
RED, GRN, BLU
= 1V
P-P
-1
V
IH
V
IL
2.0
0.8
1.6
1.6
2.9
V
2.8
4.75
430
5.25
800
V
FA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Shutdown Supply Current
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
I
SHDN
V
UVLO
8
4.3
FA
V
V
RED, GRN, BLU
RED, GRN, BLU Capacitance
RED, GRN, BLU Leakage Current
SYNCH0, SYNCV0, EN,
EN
Input Logic-High
Input Logic-Low
V
V
C
OUT
2.2
+1
pF
FA
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Maxim Integrated Products
2
*The
parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet.
MAX14895E
Enhanced VGA Port Protector
ELECTRICAL CHARACTERISTICS* (continued)
(V
CC
= +4.75V to +5.25V, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are at V
CC
= +5V, T
A
= +25NC.) (Note 2)
PARAMETER
SYNCH0, SYNCV0 Leakage
Current
EN,
EN
Input Resistance
SYNCH1, SYNCV1
Output Logic-High
Output Logic-Low
Rising Time
Falling Time
Propagation Delay
Enable Time
SDA½, SCL½ (DDC)
On-Resistance
SDA0, SCL0 Off-Leakage Current
SDA1, SCL1 Reverse-Leakage
Current
SDA1, SCL1 Pullup Resistor
V
S
OUTPUT
Forward Voltage Drop
Reverse-Leakage Current
Current Limit
Discharge Resistor
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
ESD PROTECTION
SDA1, SCL1, SYNCH1, SYNCV1,
RED, GRN, BLU,
EN,
V
S
HBM
IEC 61000-4-2 Contact
±15
±8
kV
kV
+150
10
NC
NC
I
LIM
R
VS
I
LOAD
= 1mA
I
LOAD
= 60mA, V
CC
= 5V
V
CC
= 0V, V
S
= 5.25V
200
300
0.25
10
600
500
V
FA
mA
I
R
PULLUP
R
ON
V
SDA0
= V
SCL0
= 0.5V, I
LOAD
= 10mA
EN = GND,
EN
= V
CC
,
SDA0 = SCL0 = V
CC
, SDA1 = SCL1 = GND
V
CC
= 0V, V
S
= +5.25V,
V
SDA1
= V
SCL1
= +5.25V
V
CC
= +4.75V, SDA0 = SCL0 =
unconnected, EN = V
CC
,
EN
= GND,
I
LOAD
= 100FA
-1
-10
1.25
2.5
55
+1
+10
4.0
I
FA
FA
kI
V
OH
V
OL
t
R
t
F
t
PD
t
EN
V
CC
= +4.75V, source 10mA
V
CC
= +4.75V, sink 10mA
R
L
= 2.2kI, C
L
= 10pF, 10% to 90% of V
CC
(Note 3)
R
L
= 2.2kI, C
L
= 10pF, 90% to 10% of V
CC
(Note 3)
R
L
= 2.2kI, C
L
= 10pF, EN = V
CC
,
EN
=
GND (Figure
1)
R
L
= 2.2kI, C
L
= 10pF, V
SYNCH1,
V
SYNCV1
= +4.75V (Figure
1)
16
17
2.4
0.5
4
4
V
V
ns
ns
ns
Fs
SYMBOL
CONDITIONS
SYNCH0/SYNCV0 = GND or V
CC
EN = V
CC
,
EN
= GND
MIN
-1
200
TYP
MAX
+1
800
UNITS
FA
kI
Note 2:
All devices are 100% production tested at T
A
= +25NC. Limits over the operating temperature range are guaranteed by
design and not production tested.
Note 3:
Guaranteed by design.
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Maxim Integrated Products
3
*The
parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet.
MAX14895E
Enhanced VGA Port Protector
2.4V
V
SYNCH0
/V
SYNCV0
50%
50%
0V
OUTPUT HIGH
V
SYNCH1
/V
SYNCV1
50%
50%
OUTPUT LOW
t
PLH
t
PHL
t
PD
= MAX(t
PLH
, t
PHL
)
2.4V
V
EN
50%
0V
2.4V
V
EN
50%
0V
OUTPUT HIGH
V
SYNCH1
/V
SYNCV1
50%
OUTPUT LOW
t
EN
Figure 1. Timing Diagram
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Maxim Integrated Products
4
MAX14895E
Enhanced VGA Port Protector
Typical Operating Characteristics
(V
CC
= +5V, T
A
= +25NC, unless otherwise noted.)
ON-RESISTANCE vs. SDA0 VOLTAGE
MAX14895E toc01
HV BUFFER OUTPUT-VOLTAGE HIGH
vs. TEMPERATURE
5.8
5.6
OUTPUT VOLTAGE (V)
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
3.0
-40
-15
10
35
60
85
TEMPERATURE (°C)
70
60
R
ON
(Ω)
50
40
30
20
10
0
0
SDA0, SCL0 ARE
INTERCHANGEABLE
I
OUT
= 8mA
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
0.5
1.0
1.5
V
SDA0
(V)
2.0
2.5
HV BUFFER OUTPUT-VOLTAGE LOW
vs. TEMPERATURE
0.9
0.8
OUTPUT VOLTAGE (V)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
I
OUT
= 8mA
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Maxim Integrated Products
5
MAX14895E toc03
1.0
MAX14895E toc02
80
6.0
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