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TMDS442 Datasheet(PDF) 32 Page - Texas Instruments |
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TMDS442 Datasheet(HTML) 32 Page - Texas Instruments |
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32 / 47 page  www.ti.com Quad Terminated TMDSRx withEQ Quad Terminated TMDSRx withEQ Quad Terminated TMDSRx withEQ Quad TMDS Tx Quad Terminated TMDSRx withEQ Quad TMDS Tx MUX SCL1 SDA1 SCL3 SDA3 SCL_SINK1 SDA_SINK1 5V_PWR1 5V_PWR3 5V_SINK1 HPD_SINK1 ControlLogic HIGH=source1 LOW=source2 TMDSDATA 5 TMDSDATA 4 TMDSDATA 3 TMDSDATA 2 TMDSDATA 1 TMDSDATA 0 TMDSCLOCK TMDSDATA 5 TMDSDATA 4 TMDSDATA 3 TMDSDATA 2 TMDSDATA 1 TMDSDATA 0 TMDSCLOCK TMDSDATA 5 TMDSDATA 4 TMDSDATA 3 TMDSDATA 2 TMDSDATA 1 TMDSDATA 0 TMDSCLOCK UnusedOutput SCL_SINK2 SDA_SINK2 HPD_SINK2 5V_SINK2 SCL2 SDA2 SCL4 SDA4 HPD2 HPD4 5V_PWR2 5V_PWR4 HPD1 HPD3 UnusedInput UnusedInput Tosource1 Tosource2 Fromsource2 Fromsource1 From/Tosource 2 From/Tosource 1 FromSINK ToSINK From/ToSINK Fromsource1 Fromsource2 ToSINK Layout Considerations I 2C Function Description TMDS442 SLLS757A – AUGUST 2006 – REVISED MARCH 2007 Figure 32. Dual-Link 2-to-1 DVI/HDMI Switch Configuration In a dual link application, the unused TMDS input should be configured as follows: the complementary input pin is grounded through a 1-k Ω resistor, and the other pin left open. The high-speed TMDS inputs are the most critical paths for the TMDS442. There are several considerations to minimize discontinuities on these transmission lines between the connectors and the device: • The TMDS differential inputs should be layout in the shortest stubs from connectors directly • Maintain 100-Ω differential impedance into and out of the TMDS442 • Keep an uninterrupted ground plane beneath the high-speed I/Os • Keep the ground-path vias to the device as close as possible to allow the shortest return current path The SCL/SDA and SCL_SINK/SDA_SINK pins are 5-V tolerant when the device is powered off and high impedance under low supply voltage, 1.5 V or below. If the device is powered up and the I2C circuits are enabled, and EN = high, the driver T (see Figure 33) is turned on or off depending up on the corresponding R side voltage level. When the R side is pulled low below 1.5 V, the corresponding T side driver turns on and pulls the T side down to a low level output voltage, VOL. The value of VOL depends on the input to the OVS pin. When OVS is left floating 32 Submit Documentation Feedback Copyright © 2006–2007, Texas Instruments Incorporated Product Folder Link(s): TMDS442 |
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