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PCF8575DWR

TIPCF8575DWR

Texas Instruments
I/O Expander 16 I2C, SMBus 400 kHz 24-SOIC
Active3,619 in stock
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Overview

The PCF8575DWR is a 16-bit remote I/O expander designed for the I2C and SMBus interface, operating across a voltage range of 2.5V to 5.5V. It provides 16 quasi-bidirectional I/O pins with high-current drive capability, including an open-drain interrupt output that signals the host controller when any input state changes.

Why Choose This Part

The device features latched outputs with a current source to Vcc, allowing it to actively drive high states and sink up to 25mA for direct LED operation. Its low standby current of 10uA and support for 400 kHz Fast-mode I2C make it an efficient solution for power-sensitive embedded systems.

Applications

User Interface Expansion
Driving multiple status LEDs and reading tactile switches or keypad matrices when the primary MCU lacks sufficient GPIO.
System Monitoring
Aggregating digital alarm signals or status flags from multiple board-level subsystems into a single interrupt-driven I2C line.
Industrial Control Panels
Managing peripheral logic states and sensor inputs in 5V and 3.3V mixed-signal industrial environments.

Key Specifications

Features POR
Interface I2C, SMBus
Output Type Push-Pull
Mounting Type Surface Mount
Number of I/O 16
Package / Case 24-SOIC (0.295", 7.50mm Width)
Clock Frequency 400 kHz
Interrupt Output Yes
Voltage - Supply 2.5V ~ 5.5V
Operating Temperature -40degC ~ 85degC
Supplier Device Package 24-SOIC
Current - Output Source/Sink 1mA, 25mA

Getting Started

Connect the SCL and SDA lines to your microcontroller's I2C bus with appropriate pull-up resistors and configure the three hardware address pins (A0-A2) to set the unique bus address. Many standard I2C libraries, such as those for Arduino or STM32 HAL, support the PCF857x family by simply writing or reading two-byte sequences to manage all 16 pins.

PCF8575 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Stock
PCF8575DWR (this part) SOIC-24 3,619
PCF8575RGER VFQFN-24 2,378
PCF8575PWR TSSOP-24 376

Also Consider

MCP23017 MCHPMicrochip Technology - Offers true bidirectional I/O with configurable pull-ups and a higher 1.7 MHz I2C clock speed.

Categories

Interface ICs > I/O Expanders