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1. General Description

The LT8641EX is a Transition Minimized Differential Signaling (TMDS) switch that enables the connection of multiple High-Definition Multimedia Interface (HDMI) source devices to high-definition television (HDTV). Based on the HDMI version 1.4 specification. LT8641EX is an advanced TMDS switch that delivers a cost-effective method for manufacturers to add additional HDMI ports to their HDTV. Multiple HDMI ports allow consumers to connect variety HDMI-enabled sources to their HDTV. It supports HDCP 1.4 specification, and Audio Return Channel function.

2. Features

• 4 HDMI inputs, 1 HDMI/DVI output.
• HDMI 1.4 receive and transmit compliant.
• Supports HDCP version 1.4 specification. HDCP keys store on an external EEPROM.
• Supports SPDIF(2 CH LPCM ONLY) audio outputs or 7.1 channels I2S outputs.
• Supports one channel ARC function on HDMI link, or ARC TX only or ARC RX only.
• Supports HDMI data bypass in no audio output application.
• 4 TMDS channels per link, supporting 25MHz to 340MHz TMDS clock, and 250 Mbps to 3.4 Gbps data rate.
• Supports deep color up to 16-bit.
• Built-in pre-emphasizer which allows data transmission on long cables.
• Advanced on-die-termination calibration with automatic control.
• Automatic output disable feature for reduced power dissipation.
• Adaptive EQ can self-adapt variety of cables.
• 5V tolerance DDC IO.
• Low added jitter.
• Supports I2C config function.


• Front panel buffer for advanced television (HDTV) sets
• Standalone HDMI switcher with amplified multi-channel audio output
• Multiple input displays
• Projectors
• A/V receivers


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