Datasheet

www.ti.com
TMDS341A
SLLS702B – MAY 2006 – REVISED MARCH 2007
APPLICATION INFORMATION (continued)
Table 2 summarizes the recommended cable lengths based on threshold voltages V
IH
= 0.7 V
DD
and V
IL
= 0.3
V
DD
.
Table 2. Recommended Cable Lengths Under General Threshold Voltages, 0.7 V
DD
and 0.3 V
DD
, of a DDC
Interface
DDC THRESHOLD VOLTAGE, V
IH
= 0.7 V
DD
, V
IL
= 0.3 V
DD
TOTAL CABLE LENGTH (m)
SUGGESTED PULL-UP RESISTANCE (k Ω ) CABLE TYPE SWITCH BOX Lcable1 + Lcable2 DIGITAL DISPLAY Lcable
28-AWG DVI 11 11
R
upsource
= 1.5 k Ω
R
upsink
= 47 k Ω
28-AWG HDMI 17 17
Applying the same methodology to the case of V
IH
= 1.9 V and V
IL
= 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, V
IH
= 1.9 V, V
IL
= 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 16 16
R
upsource
= 1.5 k Ω
R
upsink
= 47 k Ω
28-AWG HDMI 24 24
23
Submit Documentation Feedback