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Manufacturer Part #


CAT9554 Series 8-bit 2.3 to 5 V I²C and SMBus I/O Port with Interrupt - TSSOP-16

ECAD Model:
Mfr. Name: ON Semiconductor
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Product Variant Information section
Date Code: 2101
Product Specification Section
Technical Attributes
Attributes Table
Interface Circuit Type: I2C / SMBus
No of Channels: 1
Clock Frequency-Max: 400kHz
No of I/O Lines: 8
Supply Voltage-Nom: 2.3V to 5.5V
Supply Current: 175µA
Package Style:  TSSOP-16
Mounting Method: Surface Mount
Features & Applications

The CAT9554 and CAT9554A are CMOS devices that provide 8-bit parallel input/output port expansion for I²C and SMBus compatible applications. These I/O expanders provide a simple solution in applications where additional I/Os are needed: sensors, power switches, LEDs, pushbuttons, and fans.

The CAT9554/9554A consist of an input port register, an output port register, a configuration register, a polarity inversion register and an I²C/SMBus compatible serial interface. Any of the eight I/Os can be configured as an input or output by writing to the configuration register. The system master can invert the CAT9554/9554A input data by writing to the active-high polarity inversion register. The CAT9554/9554A features an active low interrupt output which indicates to the system master that an input state has changed. The device’s extended addressing capability allows up to 8 devices to share the same bus. The CAT9554A is identical to the CAT9554 except the fixed part of the I²C slave address is different. This allows up to 16 of devices (eight CAT9554 and eight CAT9554A) to be connected on the same bus.

Key Features:

  • 400kHz I²C bus compatible
  • 2.3V to 5.5V operation
  • Low stand-by current
  • 5V tolerant I/Os
  • 8 I/O pins that default to inputs at power-up
  • High drive capability
  • Individual I/O configuration
  • Polarity inversion register
  • Active low interrupt output
  • Internal power-on reset
  • No glitch on power-up
  • Noise filter on SDA/SCL inputs
  • Cascadable up to 8 devices
  • Industrial temperature range
  • RoHS-compliant 16-lead SOIC and TSSOP, and
  • 16-pad TQFN (4 x 4mm) packages


  • White goods (dishwashers, washing machines)
  • Handheld devices (cell phones, PDAs, digital cameras)
  • Data Communications (routers, hubs and servers)

To learn more about the CAT9554 product family, Click Here

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