PCA8550D数据手册恩XP中文资料规格书

描述 Description

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

特性 Features

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