Datasheet
TMDS361B
SLLS988A –SEPTEMBER 2009–REVISED JULY 2011
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TMDS DDC and Local I
2
C Pins
DDC I
2
C Buffer or Repeater: The TMDS361B provides buffering on the DDC I
2
C interface for each of the input
ports connected. This feature isolates the capacitance on the source side from the sink side and thus helps in
passing system-level compliance. See the DDC I2C Function Description section for a detailed description on
how the DDC I
2
C buffer operates. Note that a key requirement on the sink side is that the V
IL(Sink)
(input to
TMDS361B) should be less than 0.4 V. This requirement should be met for the DDC I
2
C buffer to function
properly. There are three settings of V
IL(Sink)
and V
OL(Sink)
that can be chosen based on OVS settings (See Table 8
through Table 11).
Local I
2
C Interface: The TMDS361B includes a slave I
2
C interface to control device features like TMDS input
port selection, TMDS output edge-rate control, power management, DDC buffer OVS settings, etc. See Table 8
through Table 11.
The TMDS361B is designed to be controlled via a local I
2
C interface or GPIO interface, based on the status of
the I2C_SEL pin. The local I
2
C interface in the TMDS361B is only a slave I
2
C interface. See the I2C INTERFACE
NOTES section for a detailed description of I
2
C functionality.
ELECTRICAL CHARACTERISTICS
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
L
Low-level input current VCC = 3.6 V, V
I
= 0 V –10 10 μA
I
lkg(Sink)
Input leakage current Sink pins VCC = 3.6 V, V
I
= 4.95 V –10 10 μA
DC bias = 2.5 V, ac = 3.5 Vp-p,
C
IO(Sink)
Input/output capacitance Sink pins 15 pF
f = 100 kHz
V
IH(Sink)
High-level input voltage Sink pins 2.1 5.5 V
V
IL1(Sink)
Low-level input voltage Sink pins OVS 1 –0.2 0.4 V
V
OL1(Sink)
Low-level output voltage Sink pins I
O
= 3 mA, OVS = HIGH 0.6 0.7 V
V
IL2(Sink)
Low-level input voltage Sink pins OVS 2 –0.2 0.4 V
V
OL2(Sink)
Low-level output voltage Sink pins I
O
= 3 mA, OVS = LOW 0.5 0.6 V
V
IL3(Sink)
Low-level input voltage Sink pins OVS 3 –0.2 0.3 V
V
OL3(Sink)
Low-level output voltage Sink pins I
O
= 3 mA, OVS = high-Z 0.4 0.5 V
I
lkg(I2C)
Input leakage current Port[1:3] pins VCC = 3.6 V, V
I
= 4.95 V –10 10 μA
C
IO(I2C)
Input/output capacitance Port[1:3] pins DC bias = 2.5 V, ac = 3.5 Vp-p, f = 100 kHz 15 pF
V
IH(I2C)
High-level input voltage Port[1:3] pins 2.1 5.5 V
V
IL(I2C)
Low-level input voltage Port[1:3] pins –0.2 1.5 V
V
OL(I2C)
Low-level output voltage Port[1:3] pins I
O
= 3 mA 0.2 V
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