●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
