DDC/CEC/+5V

DDC/CEC/+5V

ATMDS0+

ATMDS0–

ATMDS1+

ATMDS1–

ATMDS2+

ATMDS2–

ATMDSCLK+

ATMDSCLK–

BTMDS0+

BTMDS0–

BTMDS1+

BTMDS1–

BTMDS2+

BTMDS2–

BTMDSCLK+

BTMDSCLK–

TS3DV421

HDMI Switch

TMDS0+

TMDS0–

TMDS1+

TMDS1–

TMDS2+

TMDS2–

TMDSCLK+

TMDSCLK–

HDMI

Receiver

HDMI Scalar/

Video Decoder

Display

(DLP, LCD, TV,

PDP, HDTV)

ATMDS0+

ATMDS0–

ATMDS1+

ATMDS1–

ATMDS2+

ATMDS2–

ATMDSCLK+

ATMDSCLK–

BTMDS0+

BTMDS0–

BTMDS1+

BTMDS1–

BTMDS2+

BTMDS2–

BTMDSCLK+

BTMDSCLK–

HDMI

Transmitter 2

HDMI

Transmitter 1

--

TS3DV421

SCDS264D – JANUARY 2008 – REVISED JANUARY 2010

www.ti.com

DESCRIPTION/ORDERING INFORMATION

The TS3DV421 is a 4-channel differential 2:1 multiplexer/demultiplexer digital video switch controlled with one

select input (SEL). SEL controls the data path of the multiplexer/demultiplexer and can be connected to any

GPIO in the system, using an external voltage divider system. The device provides high bandwidth necessary for

DVI and HDMI applications. This device expands the high-speed physical link interface from a single HDMI port

to two HDMI ports (A or B port). The unselected channel is set to a high-impedance state.

The most common application for the TS3DV421 is in the sink application. In this case, there are two sources

(i.e., DVD, set-top box, or game console) that must be routed to one HDMI receiver. The TS3DV421 can route

the signals where one HDMI receiver (in a DLP, LCD TV, PDP, or other high-definition display) can be expanded

to three ports.

The HDMI application calls for a 100-

Ω differential impedance between the differential lines (TMDSn+ and

properly designed board retains a 100-

Ω differential impedance through the switch. The unselected port is in the

high-impedance mode, such that the receiver receives information from only one source. HDCP encryption is

passed through the switch for the HDMI receiver to decode.

Table 1. ORDERING INFORMATION

ORDERABLE PART NUMBER

TOP-SIDE MARKING

QFN – RUA

Tape and reel

TS3DV421RUAR

SD421

–40°C to 85°C

TVSOP – DGV

Tape and reel

TS3DV421DGVR

SD421

(1)

(2)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com.

TYPICAL APPLICATION

2

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