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TI Introduces Two High Performance HDMI Switches


3:1 and 2:1 Devices Allow Connection of Multiple Devices to a Digital TV

DALLAS.- Texas Instruments (TI) (NYSE: TXN) today introduced two new video switches for digital video interface (DVI) or high definition multimedia interface (HDMI). The new devices connect either two or three digital video signals coming from devices such as game consoles, digital video switch boxes, set-top boxes or DVD players to a single HDTV display.

Both the TMDS351 three-port switch, and the TMDS251, two-port switch integrate four transition minimized differential signaling (TMDS) channels, one hot plug detector and a digital display control interface on each port. Each TMDS channel supports signaling rates up to 2.5 Gbps to allow 1080p resolution in 12-bit color depth, making it compatible with the HDMI 1.3a standard. Switchable termination resistors (50 ohm) are integrated at each TMDS receiver input, eliminating the need for external terminations. Both devices share the same package and pinout allowing customers to easily and quickly develop common platforms for 3 and 2 HDMI inputs.

The new HDMI/DVI switches provide selectable receiver equalization to accommodate different input cable lengths, allowing longer cable reaches and improved opening of the data eye for better noise budgeting. Each device provides strong electrostatic discharge (ESD) protection at the connector by featuring 8 kV human body model (HBM) circuitry on the TMDS inputs.

These new switches support power saving operation. When a system is in standby mode and there is no transmission of digital audio/visual content from a connected source, the 3.3-V supply voltage can be powered off to minimize power consumption from the TMDS inputs, outputs and internal switching circuits.

The TMDS351 and TMDS251 devices join TIís extensive offering of high-performance analog and digital signal processor (DSP) products for video applications, including DaVinciTM processors optimized for digital video systems, the TVP7000/1 triple 8/10-bit video ADCs, and DLPģ technology. TI provides the silicon, software, systems expertise and support for customersí video designs, enabling them to accelerate market entry. For more information on TIís video products, see the Video and Imaging Solutions Guide at

Pricing and Availability

The TMDS351 and TMDS251 switches are available now in 64-pin TQFP packages, from TI and its authorized distributors priced at $2.50 and $1.60 respectively, each in 1,000-piece quantities.


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