PCA8550D,112 [NXP]

The PCA8550 is a 4-bit 2-to-1 I2C multiplexer with a 1-bit latch DIP switch. It features a 5-bit internal non-volatile register that can be read and written via I2C-bus. The device includes an override input to force all outputs to logic 0, a write-protect pin to control register writes, and multiplexed outputs at 2.5 V and a non-multiplexed latched output at 3.3 V. It is designed for 'jumperless' configuration of PC motherboards, particularly in Pentium Pro/Pentium II systems.