TMDS341 Datasheet, PDF (22/25 Pages) Texas Instruments – 3-TO-1 DVI/HDMI SWITCH

TMDS341
SLLS660A – AUGUST 2005 – REVISED OCTOBER 2005
www.ti.com
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
SUGGESTED PULL-UP RESISTANCE (kΩ) CABLE TYPE
R_upsource = 1.5 kΩ
R_upsink = 47 kΩ
28-AWG DVI
28-AWG HDMI
TOTAL CABLE LENGTH (m)
SWITCH BOX Lcable1 + Lcable2 DIGITAL DISPLAY Lcable
11
11
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
SUGGESTED PULL-UP RESISTANCE (kΩ) CABLE TYPE
R_upsource = 1.5 kΩ
R_upsink = 47 kΩ
28-AWG DVI
28-AWG HDMI
TOTAL CABLE LENGTH (m)
SWITCH BOX Lcable1 + Lcable2 DIGITAL DISPLAY Lcable
16
16
24
24
22