TCA6424_10 Datasheet, PDF (1/29 Pages) Texas Instruments – LOW-VOLTAGE 24-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

TCA6424
www.ti.com
SCPS175A – NOVEMBER 2007 – REVISED NOVEMBER 2009
LOW-VOLTAGE 24-BIT I²C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
Check for Samples: TCA6424
FEATURES
1
• 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 SCL/SDA and
1.8-V, 2.5-V, 3.3-V, or 5-V P Port
– 2.5-V SCL/SDA and
1.8-V, 2.5-V, 3.3-V, or 5-V P Port
– 3.3-V SCL/SDA and
1.8-V, 2.5-V, 3.3-V, or 5-V P Port
– 5-V SCL/SDA and
1.8-V, 2.5-V, 3.3-V, or 5-V P Port
• I²C to Parallel Port Expander
• Low Standby Current Consumption of 1 μA
• Schmitt-Trigger Action Allows Slow Input
Transition and Better Switching Noise
Immunity at the SCL and SDA Inputs
– V_hys = 0.18 V Typ at 1.8 V
– V_hys = 0.25 V Typ at 2.5 V
– V_hys = 0.33 V Typ at 3.3 V
– V_hys = 0.5 V Typ at 5 V
• 5-V Tolerant I/O Ports
• Active-Low Reset (RESET) Input
• Open-Drain Active-Low Interrupt (INT) Output
• 400-kHz Fast I²C Bus
• 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
• ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
RGJ PACKAGE
(BOTTOM VIEW)
INT 32
V_CCI 31
SDA ³⁰
SCL 29
RESET 28
V_CCP 27
ADDR ²⁶
GND 25
12 3 4 5 6 7 8
9 P10
10 P11
11 P12
12 P13
13 P14
14 P15
15 P16
16 P17
24 23 22 21 20 19 18 17
DESCRIPTION/ORDERING INFORMATION
This 24-bit I/O expander for the two-line bidirectional bus (I²C) is designed to provide general-purpose remote I/O
expansion for most microcontroller families 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 1.65 V to 5.5 V on the P-port side and
on the SDA/SCL side. This allows the TCA6424 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 bidirectional voltage level translation in the TCA6424 is provided through V_CCI. V_CCI should be connected to
the V_CC of the external SCL/SDA lines. This indicates the V_CC level of the I²C bus to the TCA6424. The voltage
level on the P-port of the TCA6424 is determined by the V_CCP.
1
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 © 2007–2009, Texas Instruments Incorporated