TMDS261B Datasheet, PDF (12/48 Pages) Texas Instruments – TWO-PORT HDMI SWITCH

TMDS261B
SLLS987A – SEPTEMBER 2009 – REVISED JULY 2011
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TMDS DDC and Local I²C Pins
DDC I²C Buffer or Repeater: The TMDS261B provides buffering on the DDC I²C 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 I²C buffer operates. Note that a key requirement on the sink side is that the V_IL(Sink) (input to
TMDS261B) should be less than 0.4 V. This requirement should be met for the DDC I²C 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 I²C Interface: The TMDS261B includes a slave I²C 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 TMDS261B is designed to be controlled via a local I²C interface or GPIO interface, based on the status of
the I2C_SEL pin. The local I²C interface in the TMDS261B is only a slave I²C interface. See the I2C INTERFACE
NOTES section for a detailed description of I²C functionality.
ELECTRICAL CHARACTERISTICS
over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
I_L
I_lkg(Sink)
C_IO(Sink)
V_IH(Sink)
V_IL1(Sink)
V_OL1(Sink)
V_IL2(Sink)
V_OL2(Sink)
V_IL3(Sink)
V_OL3(Sink)
I_lkg(I2C)
C_IO(I2C)
V_IH(I2C)
V_IL(I2C)
V_OL(I2C)
Low-level input current
Input leakage current
Input/output capacitance
High-level input voltage
Low-level input voltage
Low-level output voltage
Low-level input voltage
Low-level output voltage
Low-level input voltage
Low-level output voltage
Input leakage current
Input/output capacitance
High-level input voltage
Low-level input voltage
Low-level output voltage
Sink pins
Sink pins
Sink pins
Sink pins
Sink pins
Sink pins
Sink pins
Sink pins
Sink pins
Port[1:2] pins
Port[1:2] pins
Port[1:2] pins
Port[1:2] pins
Port[1:2] pins
VCC = 3.6 V, V_I = 0 V
VCC = 3.6 V, V_I = 4.95 V
DC bias = 2.5 V, ac = 3.5 Vp-p, f = 100 kHz
OVS 1
I_O = 3 mA, OVS = HIGH
OVS 2
I_O = 3 mA, OVS = LOW
OVS 3
I_O = 3 mA, OVS = high-Z
VCC = 3.6 V, V_I = 4.95 V
DC bias = 2.5 V, ac = 3.5 Vp-p, f = 100 kHz
I_O = 3 mA
MIN TYP MAX UNIT
–10
10 μA
–10
10 μA
15 pF
2.1
5.5 V
–0.2
0.4 V
0.6
0.7 V
–0.2
0.4 V
0.5
0.6 V
–0.2
0.3 V
0.4
0.5 V
–10
10 μA
15 pF
2.1
5.5 V
–0.2
1.5 V
0.2 V
12
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