TCA7408 Datasheet, PDF (1/25 Pages) Texas Instruments – Low-Voltage 8-Bit I2C and SMBus I/O Expander with Interrupt Output, RESET, I/ODirection Registers, and Programmable Pull-up/Pull-down

TCA7408
www.ti.com
SCPS235 – NOVEMBER 2011
Low-Voltage 8-Bit I²C and SMBus I/O Expander with Interrupt Output, RESET, I/O
Direction Registers, and Programmable Pull-up/Pull-down
Check for Samples: TCA7408
FEATURES
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• 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 <2 µA at 1.8V
• Active Current Consumption of:
– <2 µA at 1.8V 100 kHz clock
– <5 µA at 1.8V 400 kHz clock
• 100-kHz, 400-kHz 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
– V_hys = 0.18V Typ at 1.8V
– V_hys = 0.25V Typ at 2.5V
– V_hys = 0.33V Typ at 3.3V
• Active-Low Reset (RESET) Input
• Open-Drain Active-Low Interrupt (INT) Output
• Automatic power save mode
• Programmable Pull-up/Pull-down Resistors for
GPIO Inputs
• Programmable Edge Detection for Generating
Interrupts
• Interrupt Latching
• Software Reset
• Input/Output Direction Register
• Power Up With All Channels Configured as
Inputs
• No Glitch On Power Up
• Latched Outputs With High-Current Drive
Maximum Capability for Directly Driving LEDs
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
• ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 1000-V Charged-Device Model (C101)
ZSZ PACKAGE
(TOP THROUGH VIEW)
1 234
A
B
C
D
1
2
3
4
A
GND
GPIO7
GPIO6
GPIO5
B
V_CCI
V_CCP
ADDR
GPIO4
C
SDA
INT
RESET
GPIO3
D
SCL
GPIO0
GPIO1
GPIO2
DESCRIPTION
This 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 device is its wide V_CC 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.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated