PCF8574 Remote 8-Bit I/O Expander for I2C-Bus | TI.com


Remote 8-Bit I/O Expander for I2C-Bus



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)].

The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.


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

View more

Parametrics Compare all products in I2C general purpose I/O (GPIO)

Number of I/Os
VCC (Min) (V)
VCC (Max) (V)
Frequency (Max) (kHz)
Operating temperature range (C)
Package Group
PCF8574 PCF8575
8     16    
2.5     2.5    
6     5.5    
VCC     VCC    
100     400    
Interrupt Pin     Interrupt Pin    
8     8    
Catalog     Catalog    
-40 to 85     -40 to 85    
PDIP | 16
SOIC | 16
TSSOP | 20
TVSOP | 16
TVSOP | 20
VQFN | 16
VQFN | 20    
SOIC | 24
SSOP | 24
SSOP | 24
TSSOP | 24
TVSOP | 24
VQFN | 24