PS8121E integrates 1-to-1 HDMI/DVI Level Shifter to simplify system level design and reduce system level
cost for applications requiring single HDMI/DVI input and single output device in personal computing

system and other emerging digital appliances.

A precision resistor is connected from REXT pin to ground for output swing control. The input and output

are at high impedance when OE# is set at logic high.

Different level receiving equalizations can be set either by pin or by local control I2C to compensate

different PCB traces losses.

Receiver inputs are terminated with integrated active 50 ohm pull-down resistors connected to GND. The
DDC I2C signals are bidirectional and are buffered actively to reduce I2C bus loading. The DDC channel
can be enabled by DDCBUF_EN# pin. The configuration selection pins CFG0/CFG1 provide the flexibility

of adjusting the output voltage level of SCLZ/SDAZ to optimize noise margins.

The HDMI_ID_EN pin is used to configure PS8121E either as HDMI source level shifter for HDMI cable
adaptor or as DVI source level shifter for DVI cable adaptor. In Pin Control Mode, if pin HDMI_ID_EN =
HIGH, 16 bytes HDMI ID data could be read by source device from PS8121E internal ROM at I2C address
0x80h, and then source device would send HDMI signal; If pin HDMI_ID_EN = LOW, source device will
send DVI signal.