TCA6424 - Texas Instruments

TCA6424 Low-Voltage 24-Bit I2C and SMBus I/O Expander

This 24-bit I/O expander for the two-line bidirectional bus (I2C) is designed to provide general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL) and serial data (SDA)]. The major benefit of this device is its wide VCC range. It can operate from 1.65 V to 5.5 V on the P-port side and on the SDA/SCL sid.

Features

•1 Operating Power-Supply Voltage Range of 1.65 V to 5.5 V
• Allows Bidirectional Voltage-Level Translation and GPIO Expansion Between:
  – 1.8-V SCL/SDA and 1.8-V, 2.5-V, 3.3-V, or 5-V P Port
  – 2.5-V SCL/SDA and 1.8-V, 2.5-V, 3.3-V, or 5-V P Port
  – 3.3-V SCL/SDA and 1.8-V, 2.5-V, 3.3-V, or 5-V P Port
  – 5-V SCL/SDA and 1.8-V, 2.5-V, 3.3-V, or 5-V P Port
• I2C to Parallel Port Expander
• Low Standby Current Consumption of 1 μA
• Schmitt-Trigger Action Allows Slow Input Transition and Better Switching Noise Immunity at the SCL and SDA Inputs
  – Vhys = 0.18 V Typ at 1.8 V
  – Vhys = 0.25 V Typ at 2.5 .