MAX4885 Maxim, MAX4885 Datasheet

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MAX4885

Manufacturer Part Number
MAX4885
Description
The MAX4885 integrates high-bandwidth analog switches and level translating buffers to implement a complete 1:2 or 2:1 multiplexer for VGA signals
Manufacturer
Maxim
Datasheet

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The MAX4885 integrates high-bandwidth analog
switches and level-translating buffers to implement a
complete 1:2 or 2:1 multiplexer for VGA signals. The
device provides switching for RGB, display data chan-
nel (DDC), and horizontal and vertical synchronization
(HSYNC, VSYNC) signals. A low-noise charge pump
with internal capacitors provides a boosted gate-drive
voltage to improve performance of the RGB switches.
In the 1:2 multiplexer mode, HSYNC/VSYNC inputs fea-
ture level-shifting buffers to support low-voltage CMOS
or standard TTL-compatible graphics controllers. In the
2:1 multiplexer mode, the output buffers for the
HSYNC/VSYNC inputs are disabled, allowing bidirec-
tional signaling. In both modes, DDC signals are volt-
age-clamped to an external voltage to provide level
translation and protection. The MAX4885 features a
5µA shutdown mode and is ESD protected to ±8kV
Human Body Model (HBM) on externally routed pins.
The MAX4885 is specified over the extended (-40°C to
+85°C) temperature range, and is available in the 32-
pin, 5mm x 5mm TQFN package.
19-0554; Rev 0; 5/06
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.
TOP VIEW
Notebook Computers
Digital Projectors
Computer Monitors
Servers
KVM Switches
DDCB1
DDCA1
GND
SEL
G1
R1
V+
M
*EXPOSED PADDLE CONNECTED TO GND
25
26
27
28
29
30
31
32
24
1
________________________________________________________________ Maxim Integrated Products
23
2
*EP
22
3
General Description
MAX4885
TQFN
21
4
Complete VGA 1:2 or 2:1 Multiplexer
Pin Configuration
20
5
19
6
18
Applications
7
17
8
16 G2
15 R2
14
13
12
11
10
9
DDCB2
DDCA2
GND
V+
V
EN
CL
♦ +5V Single-Supply Operation
♦ Programmable Voltage Clamp for Open-Drain
♦ Low 5Ω (typ) On-Resistance (R, G, B Signals)
♦ Low 13pF (typ) On-Capacitance (R, G, B Signals)
♦ Break-Before-Make Switching Protects Against
♦ ±8kV HBM ESD Protection on Externally Routed
♦ Low 300µA Supply Current (Lower than 1µA with
♦ Space-Saving, Lead-Free, 32-Pin (5mm x 5mm)
*EP = Exposed pad.
+Denotes lead-free package.
MAX4885ETJ+ -40°C to +85°C 32 TQFN-EP*
DOCKING
STATION
CONTROLLER
DDC Signals
Circuit Shorts
Pins
Charge Pump Disabled)
TQFN Package
GRAPHICS
+3.3V
PART
0.1μF
3
2
2
Typical Operating Circuit
TEMP RANGE PIN-PACKAGE
H0, V0
DDCA0, DDCB0
SEL
EN
R0, B0, G0
M
Ordering Information
V
CL
MAX4885
GND
DDCA2, DDCB2
DDCA1, DDCB1
+5V
V+
R2, G2, B2
R1, G1, B1
H2, V2
H1, V1
Features
3
2
3
2
2
2
0.1μF
T3255-4
CODE
PKG
PORT 1
PORT 2
VGA
VGA
1

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MAX4885 Summary of contents

Page 1

... The MAX4885 features a 5µA shutdown mode and is ESD protected to ±8kV Human Body Model (HBM) on externally routed pins. The MAX4885 is specified over the extended (-40°C to +85°C) temperature range, and is available in the 32- pin, 5mm x 5mm TQFN package. Notebook Computers ...

Page 2

... Note 1: Signals exceeding V+ or GND are clamped by internal diodes. Limit forward-diode current to maximum current rating. 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 ...

Page 3

Complete VGA 1:2 or 2:1 Multiplexer ELECTRICAL CHARACTERISTICS (continued) (V+ = +5.0V ±10 +3.3V ±10 +3.3V and T = +25°C PARAMETER SYMBOL DDC MULTIPLEXER On-Resistance R DDC Leakage Charge Injection SWITCH LOGIC ...

Page 4

Complete VGA 1:2 or 2:1 Multiplexer TIMING CHARACTERISTICS (V+ = +5.0V ±10 +3.3V ±10 +25°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL Charge-Pump Startup Time t QPON RGB ANALOG SWITCHES Turn-On Time Turn-Off Time t Propagation ...

Page 5

Complete VGA 1:2 or 2:1 Multiplexer (V+ = +5.0V +3.3V and T = +25°C, unless otherwise noted vs DDAC0 (DDC SWITCHES +3. +5. ...

Page 6

Complete VGA 1:2 or 2:1 Multiplexer (V+ = +5.0V +3.3V and T = +25°C, unless otherwise noted vs. TEMPERATURE ON (HV, DDC SWITCHES) 3.0 2.5 2.0 1.5 1.0 0.5 0 -40 - ...

Page 7

... INCLUDES FIXTURE AND STRAY CAPACITANCE OUT Figure 1. Switching Time INPUT OUTPUT t SKEW t = MAX (t PD Figure 2. Propagation Delay and Skew Waveforms MAX4885 R GEN R1, G1, B1 R2, G2 GEN GND Figure 3. Charge Injection _______________________________________________________________________________________ Timing Circuits/Timing Diagrams V+ LOGIC V+ INPUT V OUT SWITCH OUTPUT ...

Page 8

... Complete VGA 1:2 or 2:1 Multiplexer +5V 10nF SEL R0, G0, B0 MAX4885 R1, G1, B1 R2, G2, B2 50Ω GND MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN R0 AND EACH SWITCH. ON-LOSS IS MEASURED BETWEEN R0 AND EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL. ...

Page 9

... V mally set to +5V because low-voltage clamping is not required, as specified by the VESA standard. Drive EN logic high to shut down the MAX4885. In shut- down mode, supply current is reduced to 5µA and all switches are high impedance, providing high-signal rejection. The RGB, HSYNC, VSYNC, and DDC switches are ESD protected to ± ...

Page 10

... Connect QP to ground for normal operation. Horizontal/Vertical Sync Multiplexer 1:2 Multiplexer Mode The MAX4885 provides two modes of operation for the HSYNC and VSYNC signals. In 1:2 mode (M = 0), the HSYNC/VSYNC inputs are buffered to provide level shift- ing and drive capability to meet the VESA specification. ...

Page 11

... UNDER TEST 10% Figure 6. HBM Discharge Current Waveform 2:1 Multiplexer High-speed switches such as the MAX4885 require proper PC board layout for optimum performance. Ensure that impedance-controlled PC board traces for high-speed signals are matched in length and as short as possible. Connect the exposed pad to a solid ground plane. ...

Page 12

... Complete VGA 1:2 or 2:1 Multiplexer SEL DDCA0 DDCB0 ______________________________________________________________________________________ Functional Diagram MAX4885 RGB CHARGE PUMP G2 B2 DDCA1 DDCB1 DDCA2 VOLTAGE CLAMP DDCB2 ...

Page 13

... For the latest package outline information www.maxim-ic.com/packages.) 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. ...

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