Remote 8-Bit I/O Expander for I²C‑Bus with Interrupt


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Block Diagram

PCF8574-PCF8574A Block Diagram

PCF8574-PCF8574A Block Diagram


  • I²C-bus to parallel port expander
  • 100 kHz I²C‑bus interface (Standard-mode I²C-bus)
  • Operating supply voltage 2.5 V to 6 V with non-overvoltage tolerant I/O held to VDD with 100 μA current source
  • 8-bit remote I/O pins that default to inputs at power-up
  • Latched outputs directly drive LEDs
  • Total package sink capability of 80 mA
  • Active LOW open-drain interrupt output
  • Eight programmable target addresses using three address pins
  • Low standby current (2.5 μA typical)
  • -40 °C to +85 °C operation
  • ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA
  • Packages offered: DIP16, SO16, SSOP20

Target Applications

  • LED signs and displays
  • Servers
  • Key pads
  • Industrial control
  • Medical equipment
  • PLC
  • Cellular telephones
  • Mobile devices
  • Gaming machines
  • Instrumentation and test measurement


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