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PCA8550

4-bit multiplexed/1-bit latched 5-bit I2C EEPROM DIP switch

NXP Semiconductors. 

PCA8550

4-bit multiplexed/1-bit latched 5-bit I2C EEPROM DIP switch

Rev. 7 — 8 April 2015

Product data sheet

1. General description

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.

2. Features and benefits

 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

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