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FEATURES

APPLICATIONS

DESCRIPTION

STB

DigitalTV

DVDPlayer

TMDS251

2-to-1

PHY SX

TMDS251

SLLS852 – AUGUST 2007

www.ti.com

2.5 Gbps 2-TO-1 DVI/HDMI SWITCH

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5-V Fixed Supply to HPD, DDC, and Source

Selection Circuits

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Compatible with HDMI 1.3a

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64-Pin TQFP Package

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Supports 2.5 Gbps Signaling Rate for 480i/p,

720i/p, and 1080i/p Resolutions up to 12-Bit

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Footprint Compatible with 3-to-1 Switch

Color Depth

TMDS351 with Port 3 Disabled

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Integrated Switchable Receiver Termination

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ROHS Compatible and 260

°C Reflow Rated

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Selectable Receiver Equalization to

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TMDS250 is Available with Port 1 Disabled

Accommodate to Different Input Cable

and Ports 2 and 3 Enabled

Lengths

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Supports 5-V to 3.3-V Level Shifting on DDC

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Intra-Pair Skew < 40 ps

Links

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Inter-Pair Skew < 65 ps

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HBM ESD Protection Exceeds 8 kV to TMDS

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Digital TV

Inputs

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Digital Projector

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3.3-V Fixed Supply to TMDS I/Os

The TMDS251 is a 2-port digital video interface (DVI) or high-definition multimedia interface (HDMI) switch that

allows up to 2 DVI or HDMI ports to be switched to a single display terminal. Four TMDS channels, one hot plug

detector, and a digital display control (DDC) interface are supported on each port. Each TMDS channel supports

signaling rates up to 2.5 Gbps to allow 1080p resolution in 12-bit color depth.

The input port is enabled by configuring source selectors, S1 and S2. When an input port is selected, the TMDS

inputs are connected to the TMDS outputs through a 2-to-1 multiplexer, the MOSFET between the input DDC

channel and the output DDC channel is turned on, and the HPD output follows the state of the HPD_SINK. The

other input port is inactive with disconnected input terminations, disconnected TMDS inputs to the outputs,

disconnected DDC inputs to the outputs, and the HPD outputs are low state. Check the source selection look up

table for the details of port selections.

When S1 is high and S2 is low, all input terminations are disconnected, TMDS inputs are high impedance with

standard TMDS terminations, all internal MOSFETs are turned off to disable the DDC links, and all HPD outputs

are connected to the HPD_SINK. This allows the initiation of the HDMI physical address discovery process.

Termination resistors (50-

are not required. A precision resistor is connected externally from the VSADJ pin to ground for setting the

differential output voltage to be compliant with the TMDS standard.

Typical Application

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2007, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.