MAXIM MAX14983E Technical data
19-5935; Rev 0; 6/11
MAX14983E
Enhanced 1:2 VGA Mux with
Monitor Detection and Priority Port Logic
General Description
The MAX14983E integrates high-bandwidth analog
switches, level-translating buffers, and 5V power switches
to implement a complete 1:2 multiplexer for VGA monitors. The device switches graphics signals between a
controller and two outputs. Integrated pullup resistors
(2.2kI typ) are provided on the monitor-side display data
channel (DDC) signal lines.
The device features a simple power interface that operates with a single +5V supply input. Two integrated
power switches with current limiting and reverse-current
protection pass the +5V supply to external loads with
minimal voltage drop.
The horizontal and vertical synchronization (HSYNC/
VSYNC) buffers shift logic levels to support +2.5V to
+5.0V CMOS or TTL-compatible graphics controllers
while meeting the VESA drive capability requirement of
Q8mA. An internal 2.5V regulator translates the DDC
voltage levels to be compatible with low-voltage graphics
controllers.
The device also features monitor-detect outputs and
enable inputs that allow monitor switching to operate either
automatically or with inputs from the graphics controller.
The MAX14983E is available in a 32-pin (5mm x 5mm)
TQFN package, and is specified over the -40NC to +85NC
extended temperature range.
Benefits and Features
S Design Flexibility
Graphics Controller Port is Protected when
VCC = 0V
DDC Switches Limit Voltage to Low-Voltage
Supply
Internal +2.5V Regulator
S High Level of Integration for Enhanced
Performance
Low 5.5pF (typ) RGB Capacitance
2.0ns (typ) tR/tF with 10pF, 2.2kI Load on
Monitor-Side SYNC Signals
Source and Sink 8mA While Meeting Speed
Requirements
±11kV Human Body Model (HBM)
S Saves Space on Board
Internal Power Switches
Pass +5V with 300mV (max) IR Drop
Short-Circuit/Thermal/Reverse-Current
Protection
5mm x 5mm, 32-Pin TQFN Package
Typical Operating Circuit
+5V
+2.5V
0.1µF
Applications
Servers
KVM Switches
Computing
Graphics Cards
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/MAX14983E.related.
����������������������������������������������������������������� Maxim Integrated Products 1
GRAPHICS
CONTROLLER
S5V2
3
R0, G0, B0 R1, G1, B1
2
HSYNC0, VSYNC0
2
SCL0, SDA0
MDOR
S5V1
MAX14983E
MD1
MD2
EN1
EN2
V
CC
HSYNC1, VSYNC1
SCL1, SDA1
R2, G2, B2
HSYNC2, VSYNC2
SCL2, SDA2
GND
S5V1
S5V2
REF
3
2
VGA
2
PORT 1
1µF
3
2
VGA
2
PORT 2
1µF
105I
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.
MAX14983E
Enhanced 1:2 VGA Mux with
Monitor Detection and Priority Port Logic
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND.)
VCC, S5V1, S5V2, SDA_, SCL_, REF, MD_,
EN_, MDOR .........................................................-0.3V to +6V
HSYNC_, VSYNC_, R_, G_, B_ ................. -0.3V to (VCC + 0.3V)
Continuous Current Through R_, G_, B_ Switches ......... Q50mA
Continuous Current Through SDA_, SCL_ Switches ...... Q50mA
Continuous Current Through S5V_ ............................... Q750mA
Peak Current Through R_, G_, B_, SDA_, SCL_
(10% duty cycle) ....................................................... Q100mA
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation 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 (BJA) ..........29NC/W
Junction-to-Case Thermal Resistance (BJC) ..............1.7NC/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.
Continuous Power Dissipation (TA = +70NC)
TQFN (derate 34.5mW/NC above +70NC)...............2758.6mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range ............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ...............................+300NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(VCC = +5V Q5%, 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
Quiescent Current I
Operating Current I
5V SWITCH (S5V1, S5V2 OUTPUTS)
S5V_ Voltage Drop V
Reverse Leakage Current I
Pulldown Resistor
Output Current Limit I
Thermal-Shutdown Threshold T
Thermal-Shutdown Hysteresis
R
R
T
SHDN_
Q
CC
S5V
L
S5V1
S5V2
LIM
SHDN
HYS
VCC = 5.25V, V
unconnected
HSYNC0 = 50kHz, VSYNC0 = 60Hz 10%
duty cycle, RL on SYNC outputs = 2kI,
REF unconnected
I
= 55mA 0.3 V
OUT
VCC = 0V, V
V
= 5.25V, no load on S5V1 or S5V2
S5V2
,
V
= V
S5V1
S5V2
EN1
EN1
= 1V, V
= V
= V
EN2
= VCC, REF
EN2
= 0V, V
= V
EN1
S5V1
EN2
= V
=
CC
50 150
1.5 2.7 mA
10
250
55 300 500 mA
+150
25
FA
FA
I
NC
NC
����������������������������������������������������������������� Maxim Integrated Products 2
MAX14983E
Enhanced 1:2 VGA Mux with
Monitor Detection and Priority Port Logic
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V Q5%, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DDC SWITCHES (SDA�, SCL� INPUTS/OUTPUTS)
Input Leakage Current I
Off-Leakage Current I
On-Resistance R
SDA1, SDA2, SCL1, SCL2
Internal Pullup Resistance
CONTROL SIGNALS (HSYNC�, VSYNC�, EN_ INPUTS/OUTPUTS)
Input Logic-Low Voltage V
Input Logic-High Voltage V
Output Logic-Low Voltage V
Output Logic-High Voltage
Rise Time/Fall Time tR, t
MONITOR DETECTION OUTPUTS (MD_, MDOR)
Output-Voltage Low V
Input Leakage Current I
R�, G�, B� SWITCH PERFORMANCE
Bandwidth f
On-Loss I
On-Resistance R
On-Resistance Matching
On-Resistance Flatness R
B1, B2 Internal Pullup Resistance R
Off-Leakage Current I
Off-Capacitance C
On-Capacitance C
ESD PROTECTION
LOFF
R
PULLUPVSDA_
V
LOD
MAX
LOSS
DR
FLAT(ON)
LOFF
OFF
V
L
ON
IL
IH
OL
OH
F
OL
ON
ON
B
ON
= VCC, V
EN1
VIN = +5.25V, VCC = 0V 10
VIN = 0.8V, I
= V
HSYNC0, VSYNC0, EN1, EN2
HSYNC0, VSYNC0, EN1, EN2
HSYNC1, HSYNC2, VSYNC1, VSYNC2,
I
= 8mA
SINK
HSYNC1, HSYNC2, VSYNC1, VSYNC2,
I
SOURCE
HSYNC0 input tR/tF < 5ns, 10% to 90% 2 ns
R
VIN = 3.3V, MD_ and MDOR deasserted
Figure 1, RS = RL = 50I
Figure 1, f = 50MHz, RS = RL = 50I
IIN = ±10mA, VIN = 0.7V
IIN = ±10mA, VIN = 0 to 0.7V
IIN = ±10mA, VIN = 0 to 0.7V
VR_ = VG_ = VB0 = 0V or V
f = 1MHz; R0, G0, B0 to R_, G_, B_ 2.5 pF
f = 1MHz; R0, G0, B0 to R_, G_, B_ 5.5 pF
= 8mA
= 3.3kI, VPU = 3.3V (Note 3)
PULLUP
= VCC, VIN = 0V or 5.25V
EN2
= I
SDA_
= 4V 2.2
SCL_
= ±10V 25
SCL_
CC
-1 +1
0.8 V
2 V
0.5 V
2.4 V
0.3 V
1
800 MHz
-0.6 dB
5 8
1
0.5 1
2.5
-1 +1
FA
FA
I
kI
FA
I
I
I
kI
FA
High-ESD Pins ESD Protection Human Body Model (Note 4)
All Other Pins ESD Protection Human Body Model (Note 4)
Note 2: All units are production tested at TA = +25NC. Specifications over temperature are guaranteed by design.
Note 3: VPU is the pullup voltage.
Note 4: See the Pin Description section for the ESD status of each pin.
����������������������������������������������������������������� Maxim Integrated Products 3
Q11
Q2
kV
kV
Enhanced 1:2 VGA Mux with
02
05
Monitor Detection and Priority Port Logic
+5V
0.1µF
V
0V OR V
50I
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
ON-LOSS IS MEASURED BETWEEN R0 AND R1 ON EACH SWITCH.
SIGNAL DIRECTION THROUGH IS REVERSED; WORST VALUES ARE RECORDED.
EN1,
CC
EN2
R1, G1, B1
CC
MAX14983E
GND
R0, G0, B0
R2, G2, B2
V
IN
V
OUT
NETWORK
ANALYZER
50I
MEAS REF
50I 50I
50I
MAX14983E
V
ON-LOSS = 20log
V
OUT
IN
Figure 1. On-Loss
(VCC = +5.0V, TA = +25NC, unless otherwise noted.)
DDC ON-RESISTANCE
vs. ANALOG SIGNAL VOLTAGE
50
I
= 10mA
SDA0
40
30
(I)
ON
R
20
TA = +85°C
10
0
TA = +25°C
V
SDA0
TA = -40°C
1.51.00.5
(V)
MAX14983E toc01
.0
Typical Operating Characteristics
RGB ON-RESISTANCE
vs. ANALOG SIGNAL VOLTAGE
50
IRO = 10mA
40
30
(I)
ON
R
20
TA = +85°C
10
0
TA = +25°C
TA = -40°C
4321
VR0 (V)
MAX14983E toc02
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