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PCF8574ADWR from TI,Texas Instruments

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PCF8574ADWR

Manufacturer: TI

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

Partnumber Manufacturer Quantity Availability
PCF8574ADWR TI 224 In Stock

Description and Introduction

Remote 8-Bit I/O Expander for I2C-Bus # Introduction to the PCF8574ADWR  

The **PCF8574ADWR** is an 8-bit I/O expander designed for I²C-bus applications, offering a simple and efficient way to extend the input/output capabilities of microcontrollers. This CMOS-based device features quasi-bidirectional ports, each configurable as either an input or output without requiring additional control signals.  

With an operating voltage range of **2.5V to 6V**, the PCF8574ADWR is compatible with a wide variety of digital systems. It includes an interrupt output that can signal the master microcontroller when an input changes state, reducing the need for continuous polling. The I²C interface supports standard (100 kHz) and fast (400 kHz) modes, ensuring flexible integration into different system architectures.  

Housed in a **SOIC-16 package**, the PCF8574ADWR is suitable for space-constrained applications. Common uses include driving LEDs, reading switches, or interfacing with sensors in industrial controls, consumer electronics, and embedded systems.  

Key features include **low power consumption**, latch-up performance exceeding 100 mA, and compatibility with most I²C controllers. Its straightforward implementation makes it a popular choice for expanding I/O capabilities in cost-sensitive designs.

Application Scenarios & Design Considerations

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

Alternative Part Number

  • PCF8574DW --: Same PCF8574A I2C I/O expander in a SOIC-16 package; identical function and pinout, differing only in package type versus the original SOIC wide body.
  • PCF8574APWR --: Same PCF8574A device in a TSSOP package; electrically equivalent I2C expander suitable as a drop-in functional replacement with a different package footprint.
  • PCF8574T --: NXP second-source PCF8574A-compatible I2C 8-bit I/O expander with the same register map and address scheme, usable as a cross-manufacturer alternative.

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