General Description

The IT6633 is a three-to-one HDMI v.1.3 active switch that supports a signalling rate of up to

2.25Gbps and the new Deep Color modes. A one-port SINK systems such as flat-panel TVs or LCD

projectors could also easily upgrade to three-port by adding an IT6633 at the front. The IT6633

operates in software mode that allows the system to control it via a two-line serial interface,

PCSCL/PCSDA. The IT6633 offers two selectable serial programming addresses by PCADR0.

As a active switch, the IT6633 equalizes incoming TMDS data with optimal quality regardless of the

incoming signal quality. The highly acclaimed equalization technology of ITE TECH. INC. provides for

support of long or low-quality HDMI cables at even the highest speeds. Input terminations of the

TMDS inputs and output current levels are both programmable. In addition, the input terminations are

disconnectable and hence significantly lower the system power consumption in inactive modes.

The IT6633 embeds an EDID RAM to save the cost of the Three external EDID ROMs. The process of

downloading the EDID data into the RAM is simplified by the automatic read-back capability of the

IT6633, minimizing the need of MCU intervention. The IT6633 also embeds three 1K-ohm resisters for

HPD signal paths to save external resisters and easy to implement the plug authentication.

The IT6633 also incorporates I2

C repeater in its DDC switches, which isolates the DDC capacitances

of the two sides of the switch. This allows for longer cable cascading as well as significantly eases the

system design to pass Test ID 8-9: DDC/CEC Line Capacitance and Voltage of the HDMI

Compliance Test.

The IT6633 also distinguish itself from its peers in that it offers ±8kV of Human Body Mode ESD

protection to all TMDS high-speed input pins. This saves significant costs in external high-speed ESD

diodes, which could be very expensive .

Features

HDMI active switch, providing superior performance over traditional passive switches

Compliant with HDMI 1.3 and DVI 1.0 standards

Serial data rate at up to 2.25Gbps, capable of supporting the following digital video formats in Deep

Color Mode at up to 36 bits (12 bits/color):

DTV resolutions: 480i, 576i, 480p, 576p, 720p, 1080i to 1080p

PC resolutions: VGA, SVGA, XGA, SXGA to UXGA

Single 3.3V operation

Internal AC-coupling at TMDS inputs to cope with uneven intra-pair DC levels of incoming TMDS

signals.

Embedded EDID RAM saves external EDID ROM costs

Embedded HDP resistors

Integrated HPD switches

Active port detection by monitoring PWR5V inputs and TMDS input clock.

DDC I2

C repeater isolates backend DDC capacitive loading from frontend, enhancing the DDC

operation compatibility

Human Body Mode ESD protection up to ±8kV for all TMDS differential input pins

Disconnectable input terminations with auto-calibrated impedances

Adaptive input equalization supporting long and short cables at the same time

Software-mode operation providing flexibility

Two possible serial programming device address..

Programmable TMDS output current level

Programmable source terminations compliant with HDMI 1.3 standard, providing optimal source

data eyes at high speeds

High-impedance TMDS output when disabled

Optional backend receiver termination detection for auto powerdown

64-Pin LQFP package

RoHS Compliant ( 100% Green available )