TCA6424A 24-bit I-O Expander

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

TCA6424A 24-bit I/O ExpanderTexas 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.

Feature 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

TCA6424A

ImageManufacturer Part NumberDescriptionPart StatusNumber of I/OAvailable Quantity
TCA6424ARGJR datasheet linkIC I/O EXPANDER I2C 24B 32UQFNTCA6424ARGJRIC I/O EXPANDER I2C 24B 32UQFNActive2413187 - Immediate
TCA6424ARGJR product page link
Published: 2011-04-06