TMDS341APFC datasheet(23/27 Pages) TI

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TMDS341A

SLLS702B – MAY 2006 – REVISED MARCH 2007

APPLICATION INFORMATION (continued)

Table 2 summarizes the recommended cable lengths based on threshold voltages VIH = 0.7 VDD and VIL = 0.3

VDD.

Table 2. Recommended Cable Lengths Under General Threshold Voltages, 0.7 VDD and 0.3 VDD, of a DDC

Interface

DDC THRESHOLD VOLTAGE, VIH = 0.7 VDD, VIL = 0.3 VDD

TOTAL CABLE LENGTH (m)

SUGGESTED PULL-UP RESISTANCE (k

Ω)

CABLE TYPE

SWITCH BOX Lcable1 + Lcable2

DIGITAL DISPLAY Lcable

28-AWG DVI

Rupsource = 1.5 kΩ

Rupsink = 47 kΩ

28-AWG HDMI

Applying the same methodology to the case of VIH = 1.9 V and VIL = 0.7 V, Table 3 summarizes the

recommended cable lengths to meet the timing requirement of the DDC interface.

Table 3. Recommended Cable Lengths Under General Threshold Voltages, 1.9 V and 0.7 V, of a DDC

Interface

DDC THRESHOLD VOLTAGE, VIH = 1.9 V, VIL = 0.7 V

TOTAL CABLE LENGTH (m)

SUGGESTED PULL-UP RESISTANCE (k

Ω)

CABLE TYPE

SWITCH BOX Lcable1 + Lcable2

DIGITAL DISPLAY Lcable

28-AWG DVI

Rupsource = 1.5 kΩ

Rupsink = 47 kΩ

28-AWG HDMI

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