FEATURES
2· A 4-to-2 Single-Link or 2-to-1 Dual-Link
DVI/HDMI Physical Layer Switch
· Compatible with HDMI 1.3a
· Supports 2.25 Gbps Signaling Rate for 480i/p,
720i/p, and 1080i/p Resolutions up to 12-Bit
Color Depth
· Integrated Receiver Terminations
· 8-dB Receiver Equalizer Compensates for
Losses From Standard HDMI Cables
· Selectable Output De-Emphasis Compensates
for Losses From Flat Cables
· High-Impedance Outputs When Disabled
· I2C Repeater Isolates Bus Capacitance at Both
Ends
· TMDS Inputs HBM ESD Protection Exceeds 6
kV
· 3.3-V Supply Operation
· 128-Pin TQFP Package
· ROHS Compatible and 260°C Reflow Rated

APPLICATIONS
· Digital TV
· Digital Projector
· Audio Video Receiver
· DVI or HDMI Switch

DESCRIPTION
The TMDS442, 4-to-2 port DVI/HDMI switch, allows up to 4 digital video interface (DVI) or high-definition
multimedia interface (HDMI) ports to be switched to two independent display blocks. The essential requirement
of picture-in-picture display from two digital audiovisual sources is having two individual DVI or HDMI receivers in
a digital display system. TMDS442 supports two DVI or HDMI receivers to enable multiple-source selection
(picture-in-picture), as well as supports acting as a 4-input 1-output video switch.
Each input or output port contains one 5-V power indicator (5V_PWR), one hot plug detector (HPD), a pair of I2C
interface signals (SCL/SDA), and four TMDS channels supporting data rates up to 2.25 Gbps. The 5-V power
indicator and the hot plug detector are pulled down with internal resistors, forcing a low state on these pins until
receiving a valid high signal. The I2C interface is constructed by an I2C repeater circuit to isolate the capacitance
form both ends of the buses. TMDS receivers integrate 50-Ω termination resistors pulled up to VCC, which
eliminates the need for external terminations. An 8-dB input equalization cooperates to each TMDS receiver
inputs to optimize system performance through 5-meter or longer DVI or HDMI compliant cables.