TCA6424A Datasheet PDF - TI

●DESCRIPTION

●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 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 5-V power supply.

●1

●FEATURES

●• 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

●• I

●2

●C to Parallel Port Expander

●• Low Standby Current Consumption of 1

●m

●A

●• Schmitt-Trigger Action Allows Slow Input

●Transition and Better Switching Noise

●Immunity at the SCL and SDA Inputs

●– V

●hys

●= 0.18 V Typ at 1.8 V

●– V

●hys

●= 0.25 V Typ at 2.5 V

●– V

●hys

●= 0.33 V Typ at 3.3 V

●– V

●hys

●= 0.5 V Typ at 5 V

●• 5-V Tolerant I/O Ports