8-Bit I2C-Bus and SMBus I/O Port with Interrupt, 2-Kbit EEPROM and 6 Address Pins

Product Details

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Block Diagram

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PCA9501 Block Diagram

PCA9501 Block Diagram

Block diagram: PCA9501BS, PCA9501D, PCA9501PW


Key Features

  • 8 general purpose input/output expander/collector
  • Replacement for PCF8574 with integrated 2-kbit EEPROM
  • Internal 256 x 8 EEPROM
  • Self timed write cycle (5 ms typical)
  • 16 byte page write operation
  • I2C-bus and SMBus interface logic
  • Internal power-on reset
  • Noise filter on SCL/SDA inputs
  • Active LOW interrupt output
  • 6 address pins allowing up to 64 devices on the I2C-bus/SMBus
  • No glitch on power-up
  • Supports hot insertion
  • Power-up with all channels configured as inputs
  • Low standby current
  • Operating power supply voltage range of 2.5 V to 3.6 V
  • 5 V tolerant inputs/outputs
  • 0 Hz to 400 kHz clock frequency
  • ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
  • Packages offered: SO20, TSSOP20, HVQFN20


Quick reference to our documentation types.

1-5 of 16 documents

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Design Resources

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Design Files

2 design files

  • Models

    PCA9501 IBIS model

  • Symbols and Footprints

    PCA9501BS-HVQFN20-CAD Symbol and PCB Footprint – BXL File


1 hardware offering


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