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