PCF8574A I²C I/O Expander

Features

• Two-wire IC-bus to 8-bit bidirectional parallel-bus expander
• Addressed by three hardware-address pins
• The difference between the PCF8574 and the PCF8574A is the IC address
  • PCF8574: 0x20 - 0x27 (up to 8 PCF8574’s per IC bus)
  • PCF8574A: 0x38 - 0x3F (up to 8 PCF8574A’s per IC bus)
• A total of 16 PCF8574 and PCF8574A devices may be used on same IC bus

Benefits

• All packages are lead-free
• Open-drain interrupt output to signal a change on an I/O pin
• Latched outputs with high-current drive capability for driving LED’s

Applications

• Fan Control
• LED Control
• System Monitoring

Competition

• Industry’s smallest PCF8574 and PCF8574A in QFN package
• Drop-in replacement to other market players