TCA6408PW Datasheet – 8-BIT, I2C and SMBus I/O Expander

Part Number: TCA6408PW

Function: Low-Voltage 8-BIT I2C and SMBus I/O Expander

Package: TSSOP, UQFN, VQFN 16 Pin Type

Manufacturer: Texas Instruments


TCA6408PW datasheet



This 8-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 TCA6408 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. Input/Output Configuration Register

2. Polarity Inversion Register

3. Internal Power-On Reset

4. Power Up With All Channels Configured as Inputs

5. No Glitch On Power Up

6. Noise Filter on SCL/SDA Inputs


TCA6408PW Datasheet PDF Download

TCA6408PW pdf

Other data sheets are available within the file:

TCA6408, TCA6408P, TCA6408PWG4, TCA6408PWR, TCA6408PWRG4