ST STHDMI002A User Manual

Wide bandwidth, 2 to 1 HDMI switch with single enable

Features

■ Compatible with HDMI v1.2, DVI v1.0 digital

interfaces

■ 165MHz speed operation supports all video

formats up to 1080p and SXGA (1280 x 1024
at 75Hz)

■ Data rate per channel for UXGA: 1.65Gbps

■ Low R

■ V

CC

■ Low current consumption: 20µA

■ ESD human body model HBM Voltage:

–

■ Channel ON capacitance: 6pF (typ)

■ Switching speed: 9ns

■ Near-zero propagation delay: 250ps

■ Low crosstalk: -32dB at 825MHz

■ Bit-to-bit skew: 200ps

■ Very low ground bounce in flow through mode

■ Data and control inputs provide an undershoot

clamp diode

■ Wide bandwidth minimizes skew and jitter

■ Hot insertion capable

■ Isolated Digital Display Control (DDC) bus for

unused ports

■ 5V tolerance to all DDC and HPD_SINK inputs

■ Supports bi-directional operation

■ Available in the TQFP48 package

■ –40°C to 85°C operating temperature range

: 5.5 Ω(typ)

ON

operating range: 3.135V to 3.465V

±2KV for all I/Os

STHDMI002A

TQFP48

Description

The STHDMI002A is a differential Single Pole
Double Throw (SPDT) 2 to 1, low Ron,
bi-directional HDMI switch designed for advanced
TV applications supporting HDMI/DVI which
demand high definition superior image quality.
The differential signal from the 2 ports of HDMI is
multiplexed through the switch to form a single
output HDMI channel going to the HDMI receiver
while the unselected output goes to the high-Z
state.

It is designed for very low cross-talk, low bit-to-bit
skew, high channel-to-channel noise isolation and
low I/O capacitance. The switch offers very little or
practically no attenuation of the high-speed
signals at the outputs, thus preserving the signal
integrity to pass stringent requirements.

The STHDMI002A also includes the DDC as well
as the HPD line switching. The pin layout is
optimized for easy PCB routing to the HDMI
connector and HDMI receivers.

The maximum DVI/HDMI data rate of 1.65Gbps
provides the resolution required by the advanced
HDTV and PC graphics.

Applications

■ Advanced TVs

■ Front projectors

■ LCD TVs

■ PDPs

■ LCD monitors

■ Notebook PCs

■ STB and DVD players

October 2006 Rev 1 1/26

Advantages

STHDMI002A provides the ability to switch a
single source output to various display devices or
switch video display devices between multiple
sources. It reduces the overall BOM costs by
eliminating the need for more costly multi input­output controllers.

www.st.com

26

Contents STHDMI002A

Contents

1 Functional diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1 HPD pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 DDC channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.1 Function table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6 DC electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.1 Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.2 Power supply characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.3 Dynamic electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.4 Dynamic switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.5 ESD performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7 Test circuit for electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8 Timing waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

9 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

9.1 Power supply sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

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STHDMI002A Contents

9.2 Supply bypassing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

9.3 Differential traces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

11 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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Functional diagram STHDMI002A

1 Functional diagram

Figure 1. Functional diagram

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STHDMI002A Functional description

2 Functional description

The STHDMI002A routes physical layer signals for high bandwidth digital video and is
compatible with low voltage differential signaling standards like TMDS. The device multiplexes
differential outputs from a video source to one of the two corresponding outputs to a common
display. The low on-resistance and low I/O capacitance of STHDMI002A result in a very small
propagation delay. The device integrates SPDT-type switches for 3 differential data TMDS
channels and 1 differential clock channel. Additionally it integrates the switches for DDC and
HPD lines switching.

The I²C interface of the selected input port is linked to the I²C interface of the output port, and
the hot plug detector (HPD) of the selected input port is output to HPD_SINK. For the unused
ports, the I²C interfaces are isolated, and the HPD pins are also isolated.

2.1 HPD pins

The input of the Y_HPD is 5V tolerant, allowing direct connection to 5V signals. The switch is
able to pass both 0V and 5V signal levels. The HPD switch resistance depends on the input
voltage level. At low (near to 0V) input voltage levels, the resistance is 20Ω typically and at high
(near to 5V) input voltage levels, the resistance is 150Ω typically.

2.2 DDC channels

The DDC channels are designed with a bi-directional NMOS gate, providing 5V signal
tolerance. The 5V tolerance allows direct connection to a standard I²C bus, thus eliminating the
need for a level shifter. When the input is a 5V, the NMOS switch is turned off and the pull up
resistor on either side of the switch determines the high voltage potential.

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Application diagram STHDMI002A

3 Application diagram

Figure 2. Application diagram

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STHDMI002A Pin configuration

4 Pin configuration

Figure 3. Pin connections

TQFP48 (pitch = 0.5mm)

7/26

Pin configuration STHDMI002A

Table 1. Pin description

Pin number Pin Name Type Function

1 VCC Power Supply voltage (3.3V ± 5%)

2 ACLK- Input TMDS Clock- for port A

3 ACLK+ Input TMDS Clock+ for port A

4 GND Power Ground

5 A0- Input TMDS Data 0- for port A

6 A0+ Input TMDS Data 0+ for port A

7 GND Power Ground

8 A1- Input TMDS Data 1- for port A

9 A1+ Input TMDS Data 1+ for port A

10 GND Power Ground

11 A2- Input TMDS Data 2- for port A

12 A2+ Input TMDS Data 2+ for port A

13 VCC Power Supply voltage (3.3V ± 5%)

14 B_HPD Output Hot Plug Detect (HPD) output for port B

15 GND Power Ground

16 B_DDC_SDA I/O DDC SDA input for port B

17 B_DDC_SCL I/O DDC SCL input for port B

18 VCC Power Supply voltage (3.3V ± 5%)

19 BCLK- Input TMDS Clock- for port B

20 BCLK+ Input TMDS Clock+ for port B

21 GND Power Ground

22 B0- Input TMDS Data 0- for port B

23 B0+ Input TMDS Data 0+ for port B

24 GND Power Ground

25 B1- Input TMDS Data 1- for port B

26 B1+ Input TMDS Data 1+ for port B

27 GND Power Ground

28 B2- Input TMDS Data 2- for port B

29 B2+ Input TMDS Data 2+ for port B

30 SEL Input Select control input to select port A or port B

31 Y2+ Output TMDS Data2+ output

32 Y2- Output TMDS Data2- output

33 GND Power Ground

34 Y1+ Output TMDS Data1+ output

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