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Home » NEWEST Products » New by Manufacturer » Texas Instruments » TCA7408 8-Bit I²C I/O Expander - TI
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Texas Instruments TCA7408 8-Bit I²C I/O Expander
Texas Instruments TCA7408 8-Bit I²C I/O Expander

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Texas Instruments TCA7408 8-Bit I²C I/O Expander

Texas Instruments TCA7408 8-bit I/O expander for the two-line bidirectional bus (I²C) is designed to provide general-purpose remote I/O expansion via the I²C interface [serial clock (SCL) and serial data (SDA)]. The major benefit of this TI I/O expander is its wide VCC range. It can operate from 1.65V to 3.6V on the GPIO-port side and 1.65V to 5.5V on the SDA/SCL side. This allows the TCA7408 to interface with next-generation microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power. The bidirectional voltage-level translation in the TCA7408 is provided through VCCI.

The TCA7408-5405EVM is designed to show the use of multiple TI products, including the TCA7408, on a single evaluation board.


TCA7408 Features
  • Operating Power-Supply Voltage Range of 1.65V to 3.6V
  • Allows Bidirectional Voltage-Level Translation and GPIO Expansion Between:
    • 1.8V SCL/SDA and 1.8V, 2.5V, 3.3V GPIO port
    • 2.5V SCL/SDA and 1.8V, 2.5V, 3.3V GPIO port
    • 3.3V SCL/SDA and 1.8V, 2.5V, 3.3V GPIO port
    • 5V SCL/SDA and 1.8V, 2.5V, 3.3V GPIO port
  • Standby Current Consumption of <2µA at 1.8V
  • Active Current Consumption of:
    • <2µA at 1.8V 100 kHz clock
    • <5µA at 1.8V 400 kHz clock
  • 100kHz, 400kHz Fast Mode
  • Internal Power-On-Reset and Watchdog Timer
  • Fail safe I²C, INT, and RESET lines
  • Noise Filter on SCL/SDA and Inputs
  • Schmitt-Trigger Action Allows Slow Input Transition and Better Switching Noise Immunity at the SCL and SDA Inputs
    • Vhys = 0.18V Typ at 1.8V
    • Vhys = 0.25V Typ at 2.5V
    • Vhys = 0.33V Typ at 3.3V
  • Active-Low Reset (RESET) Input
  • Open-Drain Active-Low Interrupt (INT) Output
TCA7408-5405EVM Features
  • Works with MSP430 Launchpad
  • Illustrates the use of TPL0401 DPOT for color mixing
  • TCA7408 used for key press detection
  • Shows the use of Single wire self timed interface in TCA5405
  • Color mixing, LED blinking control

TCA7408 Logic Diagram


TCA7408 Logic Diagram
  • Texas Instruments