PCF8574 Datasheet – Remote 8-Bit I/O Expander – TI

Part Number : PCF8574, PCF8574N

Function : Remote 8-Bit I/O Expander

Package : DIP 16 Pin type

Manufactures : Texas Instruments




This 8-bit input/output (I/O) expander for the two-line bidirectional bus (I2C) is designed for 2.5-V to 6-V VCC operation. The PCF8574 device provides general-purpose remote I/O expansion for most microcontroller families by way of the I2C interface [serial clock (SCL), serial data (SDA)].




1. Low Standby-Current Consumption of 10 μA Max
2. I2C to Parallel-Port Expander
3. Open-Drain Interrupt Output
4. Compatible With Most Microcontrollers
5. Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
6. Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II

Official Homepage : http://www.ti.com/product/PCF8574


1. Telecom Shelters : Filter Units
2. Servers
3. Routers (Telecom Switching Equipment)
4. Personal Computers
5. Personal Electronics
6. Industrial Automation
7. Products with GPIO-Limited Processors

PCF8574 Datasheet


PCF8574 pdf

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PCF8574Remote 8-Bit I/O Expander – TI
PCF8574Remote 8-bit I/O expander – Philips

PCF8574 Datasheet – Remote 8-bit I/O expander – Philips

Part Number : PCF8574

Function : Remote 8-bit I/O expander for I2C-bus

Package : DIP, SOP 16 Pin, SSOP 20 Pin Type

Manufactures : Philips Semiconductors



The PCF8574 is a silicon CMOS circuit. It provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I2C). The device consists of an 8-bit quasi-bidirectional port and an I2C-bus interface. The PCF8574 has a low current consumption and includes latched outputs with high current drive capability for directly driving LEDs. It also possesses an interrupt line (INT) which 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. This means that the PCF8574 can remain a simple slave device.




1. Operating supply voltage 2.5 to 6 V
2. Low standby current consumption of 10 mA maximum
3. I2C to parallel port expander
4. Open-drain interrupt output
5. 8-bit remote I/O port for the I2C-bus
7. Compatible with most microcontrollers
8. Latched outputs with high current drive capability for directly driving LEDs
9. Address by 3 hardware address pins for use of up to 8 devices (up to 16 with PCF8574A)


PCF8574 Datasheet

PCF8574 pdf