The PCF8574 is a remote 8-bit I/O expander for the I2C bus. It features low standby current consumption, compatibility with most microcontrollers, latched outputs with high current drive capability, etc.
The PCF8574 is a silicon CMOS integrated circuit that provides an 8‑bit quasi‑bidirectional I/O port for I2C‑bus systems. It includes latched outputs capable of directly driving LEDs and an open‑drain interrupt output for efficient communication with microcontrollers.
The device operates from 2.5 V to 6 V, draws a maximum standby current of 10 µA, and is available in DIP16, SO16 and SSOP20 packages. Addressing is performed with three hardware address pins, allowing up to eight devices on the same bus.
| Operating supply voltage | 2.5 V to 6 V |
|---|---|
| Standby current consumption | 10 µA max |
| I/O port width | 8‑bit remote I/O |
| Interrupt output type | Open‑drain |
| Address pins | 3 hardware address pins (up to 8 devices) |
| Package options | DIP16, SO16, SSOP20 |
The device operates from 2.5 V to 6 V.
It draws a maximum standby current of 10 µA.
It provides an 8‑bit remote I/O port.
The IC is offered in DIP16, SO16 and SSOP20 packages.