22-Bit SPI I/O Expander with Agile I/O Features


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Block Diagram


PCAL9722 Block Diagram


High Channel Count Expansion

  • Industry’s first 22-bit GPIO with SPI

Highly Configurable Agile I/O Features

  • Push-pull or open-drain outputs
  • Interrupt status registers
  • Four different output drive strengths
  • Enable and resistor selector for pull-up and pull-down resistors
  • Interrupt mask options

Robust Features

  • Schmitt trigger action allows slow input transition and better switching noise immunity
  • 5.5 V tolerant I/O ports and SPI bus pins
  • Noise filter on SPI inputs
  • Latch-up performance exceeds 100 mA per JESD 78, Class II
  • ESD protection exceeds JESD 22

Part numbers include: PCAL9722HN, PCAL9722HN/Q900.


Quick reference to our documentation types.

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