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PDF STHDMI002A Data sheet ( Hoja de datos )
| Número de pieza | STHDMI002A | |
| Descripción | 2 to 1 HDMI switch | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STHDMI002A
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
TQFP48
■ Low RON: 5.5 Ω(typ)
■ VCC operating range: 3.135V to 3.465V
■ Low current consumption: 20µA
■ ESD human body model HBM Voltage:
– ±2KV for all I/Os
■ 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
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
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 input-
output controllers.
■ STB and DVD players
October 2006
Rev 1
1/26
www.st.com
26
1 page  
STHDMI002A
2 Functional description
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.
5/26
5 Page 
STHDMI002A
6 DC electrical characteristics
DC electrical characteristics
TA = -40 to +85 °C, VCC = 3.3V ± 5%
Table 5. DC electrical characteristics
Symbol
Parameter
VIH HIGH level input voltage (SEL pin)
VIL LOW level input voltage (SEL pin)
VIK Clamp Diode voltage (All IOs)
IIH Input high current (SEL pin, A, B data ports)
IIL Input low current (SEL pin, A, B data ports)
IOFF Power down leakage current
RON Switch ON resistance (1)
RFLAT ON resistance flatness (1) (2)
∆RON
ON resistance match between channels
∆RON = RONMAX - RONMIN (1) (3)
DDC I/O Pins
II(leak) Input leakage current
IOFF Power down leakage current
CI/O
Switch off capacitance
Switch on capacitance
Test conditions
Min Typ Max Unit
High level guaranteed
2.0
V
Low level guaranteed
-0.5
0.8
VCC = 3.465V, IIN = -18mA
VCC = 3.465V, VIN = VCC
VCC = 3.465V, VIN = GND
VCC = 0V;
Outputs (Y-port) = 0V;
Inputs (A-port) = 3.465V;
Inputs (B-port) = 3.465V
-0.8 -1.2
±5
±5
±5
VCC = 3.135 V,
VIN = 1.5 to VCC
IIN = -40mA
VCC = 3.135 V,
VIN = 1.5 to VCC
IIN = -40mA
VCC = 3.135 V,
VIN = 1.5 to VCC
IIN = -40mA
5.5 7.5
0.8
1.0 1.3
V
V
µA
µA
µA
Ω
Ω
Ω
VCC = 3.465V
VI (max) = 5.3V on
isolated DDC ports
Y= 0.0V
VCC = 0V;
Outputs (Y-port) = 0V;
Inputs (A-port) = 5.3V;
Inputs (B-port) = 5.3V
VI=0V, VCC=3.3V, T= 25°C
F = 1 MHz
0.1 +2 µA
±5 µA
5 pF
9 pF
11/26
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet STHDMI002A.PDF ] | |
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