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Product details

Parameters

Number of I/Os 8 Features Adjustable I/O level, Configuration registers, Interrupt pin, Reset pin Supply voltage (Min) (V) 1.65 Supply voltage (Max) (V) 3.6 Addresses 2 Rating Automotive Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 125 open-in-new Find other I2C general-purpose I/Os (GPIOs)

Package | Pins | Size

TSSOP (PW) 16 22 mm² 5 x 4.4 open-in-new Find other I2C general-purpose I/Os (GPIOs)

Features

  • I2C to Parallel Port Expander
  • Operating Power-Supply Voltage Range of 1.65 V to 3.6 V
  • Allows Bidirectional Voltage-Level Translation and GPIO Expansion Between 1.8-, 2.5-, and 3.3-V I2C Bus and P-Ports
  • Low Standby Current Consumption
  • 400-kHz Fast I2C Bus
  • Hardware Address Pin Allows Two TCA6408A-Q1 Devices on the Same I2C/SMBus Bus
  • Active-Low Reset (RESET) Input
  • Open-Drain Active-Low Interrupt (INT) Output
  • Input and Output Configuration Register
  • Polarity Inversion Register
  • Internal Power-On Reset
  • Power Up With All Channels Configured as Inputs
  • No Glitch On Power Up
  • Noise Filter on SCL/SDA Inputs
  • Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs
  • Latch-Up Performance meets 100 mA Per AEC Q100-004
  • Schmitt-Trigger Action Allows Slow Input Transition and Better Switching Noise Immunity at the SCL and SDA Inputs
  • ESD Protection
    • 2000-V Human Body Model (Q100-002)
    • 1000-V Charged-Device Model (Q100-011)
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Description

The TCA6408A-Q1 is a 16-pin device that provides 8-bits of general purpose parallel input and output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol. This device can operate with a power supply voltage ranging from 1.65 V to 3.6 V on both the I2C bus side (VCCI) and on the P-port side (VCCP). This allows the TCA6408A-Q1 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 higher power supply.

The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O expanders such as the TCA6408A-Q1 provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and so forth.

open-in-new Find other I2C general-purpose I/Os (GPIOs)
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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet TCA6408A-Q1 Low-Voltage 8-Bit I2C and SMBus I/O Expander With Interrupt Output datasheet Sep. 14, 2016
Application notes I2C Dynamic Addressing Apr. 25, 2019

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
49
Description

The IO expander evaluation module (EVM) lets you evaluate TI's portfolio of SMBus and I2C IO expander line devices. The TCA6424A and TCA9539 come installed on the board. The 24-pin TSSOP footprint also supports TCA6408A, TCA6416A, TCA9534, TCA9534ATCA9535, TCA9538, TCA9554, TCA9554A and TCA9555.

Features
  • IO expander evaluation through LEDs or broken out to headers
  • Input evaluation with on board pushbutton switches
  • Example code including necessary functions for each IO expander

Software development

FIRMWARE Download
SLVC564A.ZIP (2137 KB)

Design tools & simulation

SIMULATION MODELS Download
SCPM014.ZIP (107 KB) - IBIS Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
DESIGN TOOLS Download
I2C designer tool
I2C-DESIGNER — Use the I2C Designer tool to quickly resolve conflicts in addressing, voltage level and frequency in I2C based designs. Enter master and slave inputs to automatically generate an I2C tree or easily build a custom solution. This tool will help designers save time and comply with the I2C standard with (...)
Features
  • GUI-based web application
  • Exportable designs
  • JSON file uploader
  • Bill of materials generator

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 16 View options

Ordering & quality

Support & training

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