6. SIL9185 3:1 HDMI 1.3 Switch
6.1. General Desription
The SiI9185A is the first generation of TMDS switch device supporting Revision 1.3 of
the HDMI Specification (HDMI Consortium; June 2006). With three HDMI inputs and a
single output, the SiI9185A provides a low-cost method of adding additional HDMI ports
to the latest Digital TVs. New DTVs can easily connect to the many HDMI sources
coming on the market, including DVDs, STB, game consoles, PCs, camcorders, and
digital still cameras. The SiI9185A is a fully HDMI compliant device providing a simple,
lowcost method of retransmitting protected digital audio and video, giving end-users a
truly all-digital experience. Built-in backward compatibility with DVI 1.0 allows HDMI
systems to connect to any DVI 1.0 source. The SiI9185A provides additional integrated
features to help lower system cost and provide enhanced features to the end consumer.
To lower system cost, the SiI9185A provides a complete solution for switching sink-side
HDMI signals. This includes DDC switching, individual HPD control, and 5V sense. The
addition of these features eliminates additional external components, helping to lower
cost. For source-side applications, the SiI9185A DDC switching can be bypassed with
an external 4-channel I2C-bus switch(e.g., Texas Instruments PCA95445) to allow clock
stretching.
6.2. Features
x Three-input, single-output HDMI switcher
x Integrated TMDS® receiver and transmi
t cores capable of receiving and
transmitting 2.25Gbps:
x Support 60Hz, 12-bit or 720p/1080i, 120Hz, 12-bit
x Buil
dable support even at deep-color resolutions
x Pre-emphasi
s
x DVI 1.0, HDCP 1.1 and HDMI compliant receiver and transmitter
x Uses HDMI-compliant TMDS core recovery and retransmission, unlike TMDS
switches, which use high-spee
d analog switches and degrade TMDS signals
x Built-in Cons support:
x HDM
I lowers cost for adding CEC support to DTV
x Integra
l requirements on system microcontroller speeds design
6.3. Absolute Maximum Ratings
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