Owner manual

Two-Lane and Four-Lane DisplayPort Passive
Switches with Separate AUX/HPD Control
MAX4998/MAX14998
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Detailed Description
The MAX4998/MAX14998 high-speed passive switches
route one DisplayPort source between two possible
destinations or vice versa. The MAX4998 is used to
switch two-lanes plus AUX/HPD DisplayPort, and the
MAX14998 is used to switch four-lanes plus AUX/HPD
DisplayPort.
The MAX4998/MAX14998 feature two digital control
inputs (SEL1, SEL2) to switch signal paths.
Digital Control Inputs (SEL1, SEL2)
The MAX4998/MAX14998 provide two digital control
inputs (SEL1, SEL2) to select the signal path between
the COM_ and NO_/NC_ channels. SEL1 selects high-
frequency switching, while SEL2 selects AUX/HPD. On
the MAX4998, switches 1 and 2 are high-frequency
switches and switches 3 and 4 are both low-frequency
switches. On the MAX14998, switches 1, 2, 3, and 4 are
high-frequency switches and switches 5 and 6 are low-
frequency switches. The truth tables for the MAX4998/
MAX14998 are depicted in the Functional Diagrams/
Truth Tables. Drive SEL_ 0V to V
DD
to minimize power
consumption.
Analog Signal Levels
The MAX4998/MAX14998 accept standard DisplayPort
signals to a maximum of (V
DD
- 1.8V). Signals on the
COM_+ channels are routed to either the NO_+ or NC_+
channels. Signals on the COM_- channels are routed
to either the NO_- or NC_- channels. The MAX4998/
MAX14998 are bidirectional switches, allowing COM_,
NO_, and NC_, to be used as either inputs or outputs.
Pin Description (continued)
PIN
NAME FUNCTION
MAX4998 MAX14998
23 34 NO0+ Analog Switch 1. Normally Open positive terminal.
24 — GND Ground
25 39 NC1- Analog Switch 2. Normally Closed negative terminal.
26 40 NC1+ Analog Switch 2. Normally Closed positive terminal.
27 41 NC0- Analog Switch 1. Normally Closed negative terminal.
28 42 NC0+ Analog Switch 1. Normally Closed positive terminal.
— 10 COM3- Analog Switch 4. Common negative terminal.
— 11 COM4+ Analog Switch 5. Common positive terminal.
— 12 COM4- Analog Switch 5. Common negative terminal.
— 14 COM5+ Analog Switch 6. Common positive terminal.
— 15 COM5- Analog Switch 6. Common negative terminal.
— 18 NO5- Analog Switch 6. Normally open negative terminal.
— 19 NO5+ Analog Switch 6. Normally open positive terminal.
— 20 NO4- Analog Switch 5. Normally open negative terminal.
— 21 NO4+ Analog Switch 5. Normally open positive terminal.
— 22 NC5- Analog Switch 6. Normally Closed negative terminal.
— 23 NC5+ Analog Switch 6. Normally Closed positive terminal.
— 24 NC4- Analog Switch 5. Normally Closed negative terminal.
— 25 NC4+ Analog Switch 5. Normally Closed positive terminal.
— 27 NO3- Analog Switch 4. Normally Open negative terminal.
— 35 NC3- Analog Switch 4. Normally Closed negative terminal.
— — EP
Exposed Pad. Internally connected to GND. Connect to a large plane to maximize
thermal performance. Not intended as an electrical part.