CAT9554: I/O Port Expander, I2C / SMBus, 8-Bit, with Active Low Interrupt

The CAT9554 is a CMOS device that provides 8-bit parallel input/output port expansion for I²C and SMBus compatible applications. This I/O expander provides a simple solution in applications where additional I/Os are needed: sensors, power switches, LEDs, pushbuttons, and fans. The CAT9554 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 input data by writing to the active-high polarity inversion register. The CAT9554 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.

Features
  • 400 kHz I2C Bus Compatible
  • 2.3 V to 5.5 V Operation
  • Low Standby Current
  • 5.0 V 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
Applications
  • Input/output Port Expansion for Extended Addressing Capability
End Products
  • White Goods (Dishwashers, Washing Machines)
  • Handheld Devices (Cell Phones, PDAs, Digital Cameras)
  • Data Communications (Routers, Hubs and Servers)
Packages
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
I/O Port Expander, I2C / SMBus, 8-Bit, with Active Low InterruptCAT9554/D (151.0kB)6
Package Drawings (3)
Document TitleDocument ID/SizeRevision
SOIC-16, 150 mils751BG (56.2kB)revo
TQFN16, 4x4510AE (56.9kB)A
TSSOP16, 4.4x5948AN (53.9kB)revo
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
CAT9554HV4I-GT2Last ShipmentsPb-free Halide freeTQFN-16510AE1Tape and Reel2000
CAT9554WI-GConsult Sales OfficePb-free Halide freeSOIC-16751BG1Tube50
CAT9554WI-GT2Consult Sales OfficePb-free Halide freeSOIC-16751BG1Tape and Reel2000
CAT9554YI-GLast ShipmentsPb-free Halide freeTSSOP-16948AN1Tube96
CAT9554YI-GT2ActivePb-free Halide freeTSSOP-16948AN1Tape and Reel2000$0.68
Specifications
ProductI/OCascadableVCC Min (V)VCC Max (V)Interrupt OutputI/O PullupsLED Blink/PWMIO Min (mA)
CAT9554YI-GT288 Slave ID Addresses2.35.5YesYesNo10
I/O Port Expander, I2C / SMBus, 8-Bit, with Active Low Interrupt (151.0kB) CAT9554
TQFN16, 4x4 CAT9554
SOIC-16, 150 mils CAT9554
TSSOP16, 4.4x5 CAT9554