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TI-TMDS251.pdf
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DigitalTVDVDPlayer
TMDS251
2-to-1
PHY SX
TMDS251
www.ti.com
SLLS852A –AUGUST 2007– REVISED JULY 2011
2.5 Gbps 2-TO-1 DVI/HDMI SWITCH
Check for Samples: TMDS251
• 3.3-V Fixed Supply to TMDS I/Os
1
FEATURES
• 5-V Fixed Supply to HPD, DDC, and Source
• Compatible with HDMI 1.3a
Selection Circuits
• Supports 2.5 Gbps Signaling Rate for 480i/p,
• 64-Pin TQFP Package
720i/p, and 1080i/p Resolutions up to 12-Bit
• Footprint Compatible with 3-to-1 Switch
Color Depth
TMDS351 with Port 3 Disabled
• Integrated Switchable Receiver Termination
• ROHS Compatible and 260°C Reflow Rated
• Selectable Receiver Equalization to
• TMDS250 is Available with Port 1 Disabled and
Accommodate to Different Input Cable
Ports 2 and 3 Enabled
Lengths
• Supports 5-V to 3.3-V Level Shifting on DDC
• Intra-Pair Skew < 40 ps
Links
• Inter-Pair Skew < 65 ps
• HBM ESD Protection Exceeds 8 kV to TMDS
APPLICATIONS
Inputs
• Digital TV
• Digital Projector
DESCRIPTION
The TMDS251 is a 2-port digital video interface (DVI) or high-definition multimedia interface (HDMI) switch that
allows up to 2 DVI or HDMI ports to be switched to a single display terminal. Four TMDS channels, one hot plug
detector, and a digital display control (DDC) interface are supported on each port. Each TMDS channel supports
signaling rates up to 2.5 Gbps to allow 1080p resolution in 12-bit color depth.
The input port is enabled by configuring source selectors, S1 and S2. When an input port is selected, the TMDS
inputs are connected to the TMDS outputs through a 2-to-1 multiplexer, the MOSFET between the input DDC
channel and the output DDC channel is turned on, and the HPD output follows the state of the HPD_SINK. The
other input port is inactive with disconnected input terminations, disconnected TMDS inputs to the outputs,
disconnected DDC inputs to the outputs, and the HPD outputs are low state. Check the source selection look up
table for the details of port selections.
When S1 is high and S2 is low, all input terminations are disconnected, TMDS inputs are high impedance with
standard TMDS terminations, all internal MOSFETs are turned off to disable the DDC links, and all HPD outputs
are connected to the HPD_SINK. This allows the initiation of the HDMI physical address discovery process.
Termination resistors (50-Ω), pulled up to V
CC
, are integrated at each TMDS receiver input. External terminations
are not required. A precision resistor is connected externally from the VSADJ pin to ground for setting the
differential output voltage to be compliant with the TMDS standard.
Typical Application
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TMDS251
SLLS852A –AUGUST 2007– REVISED JULY 2011
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DESCRIPTION CONTINUED
The TMDS251 provides two levels of receiver input equalization for different ranges of cable lengths. Each
TMDS receiver owns frequency responsive equalization circuits. When EQ sets low, the receiver supports the
input connection in short range HDMI cables. When EQ sets high, the receiver supports the input connection in
long range HDMI cables. The TMDS251 supports power saving operation. When a system is under standby
mode and there is no digital audio/visual content from a connected source, the 3.3-V supply voltage, V
CC
, can be
powered off to minimize power consumption from the TMDS inputs, outputs, and internal switching circuits. The
HPD, DDC, and source selection circuits are powered up by the 5-V supply voltage, V
DD
, to maintain the system
hot plug detect response, the DDC link from the selected source to the sink under system standby operation. The
device is characterized for operation from 0°C to 70°C.
2 Copyright © 2007–2011, Texas Instruments Incorporated
SCL_SINK
SDA_SINK
HPD_SINK
S1
S2
Control
Logic
Y4
Z4
VSADJ
TMDS
Driver
TMDS
Driver
TMDS
Driver
TMDS
Driver
EQ
V
DD
Vcc
TMDS
Rx
Vcc
TMDS
Rx
Vcc
TMDS
Rx
Vcc
TMDS
Rx
Vcc
TMDS
Rx
Vcc
TMDS
Rx
Vcc
TMDS
Rx
Vcc
TMDS
Rx
A14
B14
A13
B13
A12
B12
A11
B11
A24
B24
A23
B23
A22
B22
A21
B21
HPD1
HPD2
SCL1
SDA1
SCL2
SDA2
Y3
Z3
Y1
Z1
Y2
Z2
HPD/DDC
PowerSupply
2-to-1
MUX
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
R
INT
TMDS251
www.ti.com
SLLS852A –AUGUST 2007– REVISED JULY 2011
FUNCTIONAL BLOCK DIAGRAM
Copyright © 2007–2011, Texas Instruments Incorporated 3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TMDS251
64-pin TQFP
NC
NC
GND
NC
NC
Vcc
NC
NC
GND
NC
NC
Vcc
NC
NC
GND
VSADJ
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Y4
Vcc
GND
Vcc
GND
SCL_SINK
SDA_SINK
HPD_SINK
S1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
A14
B14
Vcc
A13
B13
GND
A12
B12
Vcc
A11
B11
SCL
1
SDA1
HPD1
EQ
S2
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
NC
A24
Vcc
GND
Vcc
SCL2
SDA2
HPD2
VDD
Z4
Y3
Z3
Y2
Z2
Y1
Z1
B24
A23
B23
A22
B22
A21
B21
TMDS251
SLLS852A –AUGUST 2007– REVISED JULY 2011
www.ti.com
PAG PACKAGE
(TOP VIEW)
4 Copyright © 2007–2011, Texas Instruments Incorporated
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
Copyright © 2007–2011, Texas Instruments Incorporated 5
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