Datasheet
DisplayPort Auxiliary Pins
ELECTRICAL CHARACTERISTICS
SWITCHING CHARACTERISTICS
SN75DP122A
SLLS939 – NOVEMBER 2008 ............................................................................................................................................................................................
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The SN75DP122A is designed to support the bidirectional auxiliary signals through the DisplayPort port in both a
differential (DisplayPort) mode and an I
2
C (DVI, HDMI) mode. The performance of the Auxiliary bus is optimized
based on the status of the CAD_SINK pin.
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
Pass1
Maximum passthrough voltage (CAD=1) V
DD
= 4.5 V, V
I
= 5 V, I
O
= 100 µ A 2.4 4.2 V
I
OZ
Output current from unselected output V
DD
= 5.25 V, V
O
= 0 V to 3.6 V, V
I
= 0 V – 5 5 µ A
DC bias = 1 V, AC = 1.4 V
p-p
, F = 100 kHz,
C
IO(off)
I/O capacitance when in low power 9 12 pF
CAD = High
DC bias = 1 V, AC = 1.4 V
p-p
, F = 100 kHz,
C
IO(on)
I/O capacitance when in normal operation 18 25 pF
CAD = Low
r
ON(C0-
On resistance AUX+ V
DD
= 4.5 V, V
I
= 0 V, I
O
= 5 mA, CAD = Low 5 10 Ω
AUX+)
r
ON(C0-
On resistance AUX- V
DD
= 4.5 V, V
I
= 3.6V, I
O
= 5 mA, CAD = Low 5 10 Ω
AUX-)
r
ON(C1)
On resistance V
DD
= 4.5 V, V
I
= 0.4V, I
O
= 3 mA, CAD = High 10 18 Ω
V
DD
= 4.5 V, 100k pullup on AUX+ to 3.3V ± 10%, 1.48
V
AUX+
Voltage on the AUX+ 1.81 V
HPD_SINK = Low
V
DD
= 4.5 V, 100k pulldown on AUX- to GND, 1.48
V
AUX-
Voltage on the AUX- 1.81 V
HPD_SINK = Low
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
sk(AUX)
Intra-pair skew V
ID
= 400 mV, V
IC
= 2 V 350 400 ps
I
L(AUX)
Single Line Insertion Loss V
ID
= 500 mV, V
IC
= 2 V, F = 1 MHz, CAD = Low 0.4 dB
t
PLH(AUXC0)
Propagation delay time, low to high CAD = Low, F = 1 MHz 3 ns
t
PHL(AUXC0)
Propagation delay time, high to low CAD = Low, F = 1 MHz 3 ns
t
PLH(AUXC1)
Propagation delay time, low to high CAD = High, F = 100 kHz 5 ns
t
PHL(AUXC1)
Propagation delay time, high to low CAD = High, F = 100 kHz 5 ns
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