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CAT9555: I/O Port Expander, I2C / SMBus, 16-Bit, with Active Low Interrupt

Datasheet: I/O Port Expander, I2C / SMBus, 16-Bit, with Active Low Interrupt
Rev. 11 (170.0kB)
Product Overview
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» Product Change Notification
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.
Features
 
  • 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
Applications   End Products
  • 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
Tutorials (1) Package Drawings (1)
Data Sheets (1)  
Availability & Samples
Specifications
Case Outlines
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
CAT9555YI-T2 Active
Pb-free
Halide free
CAT9555 TSSOP-24 948AR 1 260 Tape and Reel 2000 $0.4267
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K

Product
Description
Pricing ($/Unit)
Compliance
Status
I/O
Cascadable
VCC Min (V)
VCC Max (V)
Interrupt Output
I/O Pullups
LED Blink/PWM
IO Min (mA)
Package Type
CAT9555YI-T2  
 $0.4267 
Pb
H
 Active   
16
8 Slave ID Addresses
2.3
5.5
Yes
Yes
No
10
TSSOP-24
Case Outlines
948AR   
Packages
CAT9555: I/O Port Expander, I2C / SMBus, 16-Bit, with Active Low Interrupt
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