PCA8574 Datasheet, PDF (1/27 Pages) NXP Semiconductors – Remote 8-bit I/O expander for I2C-bus with interrupt

PCA8574/74A
Remote 8-bit I/O expander for I²C-bus with interrupt
Rev. 02 — 14 May 2007
Product data sheet
1. General description
The PCA8574/74A provide general purpose remote I/O expansion for most
microcontroller families via the two-line bidirectional I²C-bus (serial clock (SCL), serial
data (SDA)).
The devices consist of an 8-bit quasi-bidirectional port and an I²C-bus interface. The
PCA8574/74A have low current consumption and include latched outputs with 25 mA high
current drive capability for directly driving LEDs.
The PCA8574/74A also possess an interrupt line (INT) that can be connected to the
interrupt logic of the microcontroller. By sending an interrupt signal on this line, the remote
I/O can inform the microcontroller if there is incoming data on its ports without having to
communicate via the I²C-bus.
The internal Power-On Reset (POR) initializes the I/Os as inputs.
2. Features
I 400 kHz I²C-bus interface
I 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os
I 8-bit remote I/O pins that default to inputs at power-up
I Latched outputs with 25 mA sink capability for directly driving LEDs
I Total package sink capability of 200 mA
I Active LOW open-drain interrupt output
I 8 programmable slave addresses using 3 address pins
I Readable device ID (manufacturer, device type, and revision)
I Low standby current (10 µA max.)
I −40 °C to +85 °C operation
I ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
I Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA
I Packages offered: DIP16, SO16, TSSOP16, SSOP20
3. Applications
I LED signs and displays
I Servers
I Industrial control
I Medical equipment
I PLCs