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PCF8574DWR from TI,Texas Instruments

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PCF8574DWR

Manufacturer: TI

Remote 8-Bit I/O Expander for I2C-Bus

Partnumber Manufacturer Quantity Availability
PCF8574DWR TI 3000 In Stock

Description and Introduction

Remote 8-Bit I/O Expander for I2C-Bus The **PCF8574DWR** is a versatile **I/O expander** integrated circuit designed to simplify interfacing between microcontrollers and peripheral devices. Utilizing the **I²C-bus protocol**, this 8-bit remote I/O expander allows for bidirectional communication, making it ideal for applications requiring additional input/output ports without increasing microcontroller pin count.  

Housed in a **SOIC-16 package**, the PCF8574DWR features **quasi-bidirectional I/O pins** that can be individually configured as inputs or outputs. Each pin includes a weak pull-up resistor, eliminating the need for external components in many cases. With an operating voltage range of **2.5V to 6V**, it is compatible with a wide variety of microcontrollers and logic levels.  

Key applications include **keypad interfacing, LED control, sensor monitoring, and industrial automation**, where efficient I/O expansion is crucial. The device also supports **interrupt functionality**, enabling efficient event-driven designs by alerting the microcontroller when input states change.  

Designed for **low-power operation**, the PCF8574DWR is well-suited for battery-powered systems. Its compact footprint and ease of integration make it a reliable choice for engineers seeking a cost-effective solution for expanding digital I/O capabilities in embedded systems.

Application Scenarios & Design Considerations

Remote 8-Bit I/O Expander for I2C-Bus

Alternative Part Number

  • PCF8574T --: NXP original I2C 8-bit I/O expander in SOIC package, functionally equivalent to the TI PCF8574DWR with the same register set and address scheme.
  • PCF8574AT --: Same PCF8574 family I/O expander with alternate fixed I2C address, drop-in compatible in most designs and widely available.
  • TCA9534DWR --: TI I2C 8-bit I/O expander in the same SOIC-16 wide package, similar pinout and function, suitable as a modern replacement with slightly different register behavior.

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