Datasheet
TMDS251
www.ti.com
SLLS852A –AUGUST 2007– REVISED JULY 2011
PIN FUNCTIONS
PIN
I/O DESCRIPTION
NAME NO.
A11, A12, A13, A14 39, 42, 45, 48 I Source port 1 TMDS positive inputs
A21, A22, A23, A24 54, 57, 60, 63 I Source port 2 TMDS positive inputs
B11, B12, B13, B14 38, 41, 44, 47 I Source port 1 TMDS negative inputs
B21, B22, B23, B24 53, 56, 59, 62 I Source port 2 TMDS negative inputs
Y1, Y2, Y3, Y4 26,23,20,17 O Sink port TMDS positive outputs
Z1, Z2, Z3, Z4 27,24,21,18 O Sink port TMDS negative outputs
SCL1 37 I/O Source port 1 DDC I
2
C clock line
SDA1 36 I/O Source port 1 DDC I
2
C data line
SCL2 52 I/O Source port 2 DDC I
2
C clock line
SDA2 51 I/O Source port 2 DDC I
2
C data line
SCL_SINK 29 I/O Sink port DDC I
2
C clock line
SDA_SINK 30 I/O Sink port DDC I
2
C data line
HPD1 35 O Source port 1 hot plug detector output (status pin)
HPD2 50 O Source port 2 hot plug detector output (status pin)
HPD_SINK 31 I Sink port hot plug detector input (status pin)
S1, S2 32, 33 I Source selector
TMDS Input equalization selector (control pin)
EQ 34 I EQ = Low – HDMI 1.3 compliant cable
EQ = High – 10m 28 AWG HDMI cable
VSADJ 16 I TMDS compliant voltage swing control (control pin)
V
DD
49 HPD/DDC Power supply
6, 12, 19, 25, 40,
V
CC
Power supply
46, 55, 61
3, 9, 15, 22, 28,
GND Ground
43, 58
1, 2, 4, 5, 7, 8,
NC No connect: these pins should be left floating
10, 11, 13, 14, 64
Table 1. Source Selection Lookup
(1)
CONTROL BITS I/O SELECTED HOT PLUG DETECT STATUS
SCL_SINK
S2 S1 Y/Z HPD1 HPD2
SDA_SINK
A1/B1
SCL1
H H Terminations of A2/B2 are HPD_SINK L
SDA1
disconnected
A2/B2
SCL2
H L Terminations of A1/B1 are L HPD_SINK
SDA2
disconnected
Disallowed (indeterminate)
State
L L L L
None (Z)
All terminations are
Are pulled HIGH by
disconnected
external pull-up
None (Z)
termination
L H All terminations are HPD_SINK HPD_SINK
disconnected
(1) H: Logic high; L: Logic low; X: Don't care; Z: High impedance
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