TCA6408A Low-Voltage 8-Bit I2C and SMBus I/O Expander | TI.com

TCA6408A
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Low-Voltage 8-Bit I2C and SMBus I/O Expander

Low-Voltage 8-Bit I2C and SMBus I/O Expander - TCA6408A
Datasheet
Low-Voltage 8-Bit, I2C and SMBus I/O Expander datasheet (Rev. D)
 

Description

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 (VCCI) and on the P-port side (VCCP). 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.

Features

  • 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)

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Parametrics

Compare all products in I2C general-purpose I/Os (GPIOs) Email Download to Excel
Part number Order Number of I/Os VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) Features Addresses Rating Operating temperature range (C) Package Group
TCA6408A Order now 8     1.65     5.5     400     Adjustable I/O level
Configuration registers
Interrupt pin
Reset pin    		 2     Catalog     -40 to 85     TSSOP | 16
UQFN | 16
VQFN | 16    
TCA6416A Order now 16     1.65     5.5     400     Adjustable I/O level
Configuration registers
Interrupt pin
Reset pin    		 2     Catalog     -40 to 85     TSSOP | 24
WQFN | 24    
TCA6424A Order now 24     1.65     5.5     400     Adjustable I/O level
Configuration registers
Interrupt pin
Reset pin    		 2     Catalog     -40 to 85     UQFN | 32    
TCA9538 Order now 8     1.65     5.5     400     Configuration registers
Interrupt pin
Reset pin    		 4     Catalog     -40 to 85     SSOP | 16
TSSOP | 16    
TCA9539 Order now 16     1.65     5.5     400     Configuration registers
Interrupt pin
Reset pin    		 4     Catalog     -40 to 85     TSSOP | 24
VQFN | 24
WQFN | 24    
TCA9539-Q1 Order now 16     1.65     3.6     400     Configuration registers
Interrupt pin
Reset pin    		 4     Automotive     -40 to 125     TSSOP | 24