TCA6424A 24-bit I/O Expander



Texas Instruments' 24-bit I/O expander for the two-line bidirectional bus (I²C)

Texas Instruments TCA6424A 24-bit I/O Expander Texas Instruments' 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 1.65V to 5.5V on the P-port side and on the SDA/SCL side. This allows the TCA6424A to interface with next-generation microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power. In contrast to the dropping power supplies of microprocessors and microcontrollers, some PCB components, such as LEDs, remain at a 5V power supply.   TCA6424A Datasheet

  Features   Applications
  • Operating power-supply voltage range of 1.65V to 5.5V
  • Allows bidirectional voltage-level translation and GPIO expansion between:
    • 1.8V SCL/SDA and 1.8V, 2.5V, 3.3V, or 5V P port
    • 2.5V SCL/SDA and 1.8V, 2.5V, 3.3V, or 5V P port
    • 3.3V SCL/SDA and 1.8V, 2.5V, 3.3V, or 5V P port
    • 5V SCL/SDA and 1.8V, 2.5V, 3.3V, or 5V P port
  • I²C to parallel port expander
  • Low standby current consumption of 1µA
  • Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
    • Vhys = 0.18V Typ at 1.8V
    • Vhys = 0.25V Typ at 2.5V
    • Vhys = 0.33V Typ at 3.3V
    • Vhys = 0.5V Typ at 5V
  • 5V tolerant I/O ports

Texas Instruments
Part Number
Digi-Key
Part Number
Packaging Number of I/O Interface Package  
TCA6424ARGJR 296-27844-2-ND Tape & Reel 24 I²C, SMBus 32-UFQFN TCA6424A Datasheet
296-27844-1-ND Cut Tape
296-27844-6-ND Digi-Reel