PCF8574AT Datasheet PDF - NXP

The PCF8574AT is a remote 8-bit I/O Expander for I²C-bus with interrupt. It provides general-purpose remote I/O expansion via the Two-Wire bi-directional I²C-bus. The devices consist of eight quasi-bi-directional ports, 100kHz I²C-bus interface, three hardware address inputs and interrupt output operating between 2.5 and 6V. The quasi-bi-directional port can be independently assigned as an input to monitor interrupt status or keypads or as an output to activate indicator devices such as LEDs. System master can read from the input port or write to the output port through a single register.

● I²C-bus to parallel port expander

● 8-bit Remote I/O pins that default to inputs at power-up

● Latched outputs directly drive LEDs

● Active low open-drain interrupt output

● Eight programmable slave addresses using three address pins

● Low standby current

● ESD protection exceeds 2000V HBM per JESD22-A114 and 1000V CDM per JESD22-C101

● Latch-up testing is done to JEDEC standard JESD78 which exceeds 100mA