• Converts low-swing AC coupled differential input to HDMI 1.3 compliant open-drain current steering Rx terminated differential output.
• HDMI T.M.D.S. level shifting operation up to 1.65Gb/s per lane (165MHz pixel clock).
• Enable feature to turn off T.M.D.S. inputs and outputs and to enter low-power state.
• Transparent operation: no re-timing or configuration required.
• Inter-Pair added skew < 250ps
• Intra-Pair added skew < 10ps
• Switching power only from a single 3.3V supply.
• Integrated 50-ohm termination resistors for AC coupled differential Inputs.
• Pass-gate voltage limiters allow 3.3V termination on GMCH pins, 5V DDC termination on HDMI connector pins.
• Human Body Model ESD protection: 8kV for all output pins and 2kV for all other pins.
• Level shifter for HDMI 1.3 HPD.
• Integrated pull-down resistor on HPD_SINK input guarantees “input low” when no display is plugged in.
• Driver’s current adjustment +10%.
• Inverting buffer for HPD signal
• Configurable pre-emphasis level (0dB, 2.0dB, 4.0 dB, & 6.0dB)
• Offered in a 48-Pin QFN Package.

Description

CH7318C is a high speed HDMI level shifter that converts low-swing AC coupled differential input to HDMI 1.3 compliant open-drain current steering Rx terminated differential output.

The CH7318C features integrated parallel termination resistors (50-ohm), which eliminate the requirement for external termination resistors on the T.M.D.S. differential output pins. This device has incorporated a ESD protection for DDC channels as well as T.M.D.S. signal lines. In addition, the DDC_EN pin controls bias voltage to enable or disable the DDC passgate level shifter gates. The OE* pin is a two- state output enable control for the differential input and the T.M.D.S. signal output. It can activate IN_Dx pins and OUT_Dx pins or switch them into high impedance. A unique pre-emphasis control is also implemented into CH7318C; this feature has four- level adjustment to increase rise and fall times which are degraded during the transmission over a long trace on PCB.

The device operates from a single +3.3V supply, and is characterized the operation temperature range from -10 °C to 50 °C (ambient temperature). The CH7318C is available in a 48-Pin QFN package.

| Sales Inquiry : Sales@chrontel.comm  |  Product Information: Info@chrontel.com