Texas Instruments

PCF8574RGYR

PCF8574RGYR Description

The PCF8574RGYR from Texas Instruments is an 8-bit I/O expander designed for I²C-bus applications, providing a simple solution for expanding microcontroller I/O capabilities. Operating within a 2.5V to 6V supply range, it supports a 100 kHz clock frequency, making it suitable for low-to-moderate-speed communication. The device features bidirectional I/O ports with current sourcing/sinking capabilities of 1mA (source) and 25mA (sink), enabling direct drive of LEDs or other peripherals. Packaged in a 20-VQFN (RGYR) and available in tape-and-reel (TR) format, it is ideal for surface-mount applications.

PCF8574RGYR Features

• 8 configurable I/O pins with interrupt output for efficient event-driven designs.
• Power-On Reset (POR) ensures reliable initialization at startup.
• I²C interface simplifies integration with microcontrollers, reducing GPIO constraints.
• Wide voltage range (2.5V–6V) supports compatibility with 3.3V and 5V systems.
• Low standby current for power-sensitive applications.
• RoHS3 compliant and REACH unaffected, meeting environmental regulations.
• Interrupt-driven operation minimizes MCU polling overhead.

PCF8574RGYR Applications

• Industrial control systems: Expands I/O for sensors, buttons, and relays.
• Consumer electronics: Drives LED displays or keypad matrices in smart devices.
• Embedded systems: Offloads GPIO-intensive tasks in IoT nodes or MCU-based designs.
• Automotive interfaces: Supports low-voltage peripheral control in infotainment systems.
• Test & measurement equipment: Facilitates flexible signal routing and switching.

Conclusion of PCF8574RGYR

The PCF8574RGYR is a versatile, cost-effective I/O expander offering easy I²C integration, robust performance, and low-power operation. Its interrupt capability, wide voltage range, and high sink current make it superior to basic GPIO expanders, particularly in space-constrained or power-sensitive designs. Ideal for industrial, automotive, and consumer applications, it streamlines system design while reducing MCU resource usage. For engineers seeking a reliable, scalable I/O solution, the PCF8574RGYR delivers exceptional value.