PCA8550PW,118

The primary function of the 4-bit 2-to-1 I²C multiplexer is to select either a 4-bit input or data from a non-volatile register and drive this value onto the output pins. One additional non-multiplexed register output is also provided. The non-multiplexed output is latched to prevent output value changes during I²C writes to the non-volatile register. A write protect input is provided to enable/disable the ability to write to the non-volatile register. An override" input feature forces all outputs to logic 0."

• 4-bit 2-to-1 multiplexer, 1-bit latch DIP switch
• 5-bit internal non-volatile register
• Override input forces all outputs to logic 0
• Internal non-volatile register write/readable via I²C-bus
• Write-protect pin enables/disables I²C writes to register
• 2.5 V multiplexed outputs
• 3.3 V non-multiplexed output (latched)
• 5 V tolerant inputs
• Useful for jumperless" configuration of PC motherboards
• Designed for use in Pentium Pro/Pentium II systems