General description
The PCA9558 is a highly integrated, multi-function device that is composed of a 5-bit multiplexed/1-bit latched 6-bit I2C-bus/SMBus EEPROM DIP switch, an 8-bit I/O expander and a 2-kbit serial EEPROM with write protect. The PCA9558 integrates these commonly used components into a single chip to reduce component count and board space requirements and is useful in computer, server and telecom/networking applications.

Features
■ 5-bit 2-to-1 multiplexer, 1-bit latch DIP switch
■ 6-bit MUX_OUTx and NON_MUXED_OUT EEPROM programmable and readable via I2C-bus
■ 5 V tolerant open-drain MUX_OUTx and NON_MUXED_OUT outputs
■ Active LOW override input forces all MUX_OUTx outputs to logic 0
■ I2C-bus readable MUX_INx inputs
■ 5 V tolerant open-drain IOx pins, power-up default as outputs
■ 1 address pin, allowing up to 2 devices on the I2C-bus
■ Active LOW reset input with internal pull-up for the 8 I/O pins
■ 2048-bit EEPROM programmable and readable via the I2C-bus or I/Os
■ Operating power supply voltage range of 3.0 V to 3.6 V
■ SMBus compliance with fixed 3.3 V levels

■ 2.5 V to 5 V tolerant inputs
■ ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
■ Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

Applications
■ Board version tracking and configuration
■ Board health monitoring and status reporting
■ Multi-card systems in telecom, networking and base station infrastructure equipment
■ Field recall and troubleshooting functions for installed boards
■ General-purpose integrated I/O with DIP switch and memory