TCA6408A

TSSOP (PW)

16

22 mm² 4.4 x 5

UQFN (RSV)

16

5 mm² 2.6 x 1.8

VQFN (RGT)

16

9 mm² 3 x 3

I²C to Parallel Port Expander
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, 2.5-V, 3.3-V, and 5-V I²C Bus and P-Ports
Low Standby Current Consumption of 1 μA
5-V Tolerant I/O Ports
400-kHz Fast I²C Bus
Hardware Address Pin Allows Two TCA6408A Devices on the Same I²C/SMBus Bus
Active-Low Reset (RESET) Input
Open-Drain Active-Low Interrupt (INT) Output
Input/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 Exceeds 100 mA Per JESD 78, Class II
Schmitt-Trigger Action Allows Slow Input Transition and Better Switching Noise Immunity at the SCL and SDA Inputs
ESD Protection Exceeds JESD 22
- 2000-V Human Body Model (A114-A)
- 1000-V Charged-Device Model (C101)

All trademarks are the property of their respective owners.

I²C to Parallel Port Expander
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, 2.5-V, 3.3-V, and 5-V I²C Bus and P-Ports
Low Standby Current Consumption of 1 μA
5-V Tolerant I/O Ports
400-kHz Fast I²C Bus
Hardware Address Pin Allows Two TCA6408A Devices on the Same I²C/SMBus Bus
Active-Low Reset (RESET) Input
Open-Drain Active-Low Interrupt (INT) Output
Input/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 Exceeds 100 mA Per JESD 78, Class II
Schmitt-Trigger Action Allows Slow Input Transition and Better Switching Noise Immunity at the SCL and SDA Inputs
ESD Protection Exceeds JESD 22
- 2000-V Human Body Model (A114-A)
- 1000-V Charged-Device Model (C101)

All trademarks are the property of their respective owners.

The TCA6408A is a 16-pin device that provides 8-bits of general purpose parallel input/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 5.5 V on both the I²C bus side (V_CCI) and on the P-port side (V_CCP). This allows the TCA6408A 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.

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

The TCA6408A is a 16-pin device that provides 8-bits of general purpose parallel input/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 5.5 V on both the I²C bus side (V_CCI) and on the P-port side (V_CCP). This allows the TCA6408A 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.

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

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Technical documentation

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	Type	Title	Date
*	Data sheet	Low-Voltage 8-Bit, I2C and SMBus I/O Expander datasheet (Rev. D)	20 Jul 2015
	Application note	I2C Dynamic Addressing	25 Apr 2019
	Application note	Choosing the Correct I2C Device for New Designs	07 Sep 2016
	Selection guide	I2C Infographic Flyer	03 Dec 2015
	Application note	Understanding the I2C Bus	30 Jun 2015
	Application note	Maximum Clock Frequency of I2C Bus Using Repeaters	15 May 2015
	Application note	I2C Bus Pull-Up Resistor Calculation	13 Feb 2015
	User guide	I/O Expander EVM User's Guide (Rev. A)	25 Jul 2014

Design & development

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Evaluation board

IO-EXPANDER-EVM — IO-EXPANDER-EVM: I2C and SMBus IO Expander Evaluation Module

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, TCA9534A, TCA9535, TCA9538, TCA9554, TCA9554A and TCA9555.

User guide

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Firmware

I/O Expander Software and Firmware Package (Rev. A)

SLVC564A.ZIP (2137 KB)

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Simulation model

TCA6408A IBIS Model

SCPM014.ZIP (107 KB) - IBIS Model

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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)

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Simulation tool

TINA-TI — SPICE-based analog simulation program

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Design tool

I2C-DESIGNER — I2C designer tool

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