CH7318C Datasheet rev2.4.pdf

CH7318C 201-1000-006 Rev. 2.4 01/24/2014 1 Chrontel CH7318C AC Coupled HDMI Level Shifter 1.0 FEATURES 2.0 GENERAL DESCRIPTION ? Converts low-swing AC coupled differential input to HDMI 1.4a compliant open-drain current steering Rx terminated differential output. ? HDMI TMDS level shifting operation up to 1.65Gb/s per lane (165MHz pixel clock). ? Enable feature to turn off TMDS 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 1.4a 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. CH7318C is a high speed HDMI level shifter that converts low-swing AC coupled differential input to HDMI 1.4a 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 TMDS differential output pins. This device has incorporated a ESD protection for DDC channels as well as TMDS 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 TMDS signal output. It can activate IN_Dx pins and OUT_Dx pins or switch them into high imp