CAT9555: I/O Port Expander, I2C / SMBus, 16-Bit, with Active Low Interrupt
Description: The CAT9555 is a CMOS device that provides 16-bit ...
The CAT9555 is a CMOS device that provides 16-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 CAT9555 consists of two 8-bit Configuration ports (input or output), Input, Output and Polarity inversion registers, and an I²C/SMBus-compatible serial interface.
Any of the sixteen I/Os can be configured as an input or output by writing to the configuration register. The system master can invert the CAT9555 input data by writing to the active-high polarity inversion register.
The CAT9555 features an active low interrupt output which indicates to the system master that an input state has changed.
The three address input pins provide the device's extended addressing capability and allow up to eight devices to share the same bus. The fixed part of the I²C slave address is the same as the CAT9554, allowing up to eight of these devices in any combination to be connected on the same bus.
400 kHz I2C bus compatible
2.3 V to 5.5 V operation
Low standby current
5.0 V tolerant I/Os
16 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
Input/output Port Expansion for Extended Addressing Capability
White goods (dishwashers, washing machines)
Handheld devices (cell phones, PDAs, digital cameras)
Data Communications (routers, hubs and servers)
Technical Documentation & Design Resources
Product Change Notification
Availability and Samples
Compliance: Pb-free Halide free
Description: I/O Port Expander, I2C / SMBus, 16-Bit, with Active Low Interrupt
Package Type: TSSOP-24
Package Case Outline: 948AR
Container Type: REEL
Container Qty: 2000
Market Leadtime (weeks):8 to 12
8 Slave ID Addresses
VCC Min (V):
VCC Max (V):
IO Min (mA):