PCF8574P DIP Interface – Remote I/O Expanders

I2C 8-Bit Parallel Port Expander IC – Remote GPIO Expansion Solution
This I2C-based 8-bit Parallel Port Expander IC is designed to extend microcontroller and embedded system I/O capabilities through a simple two-wire I2C interface. Featuring programmable slave addressing, interrupt output support, and latched GPIO outputs capable of directly driving LEDs, the IC provides a compact and efficient solution for expanding digital input/output lines in automation systems, embedded electronics, and IoT applications.

Why it’s a System Essential:
• I2C to Parallel Expansion: Expands microcontroller GPIO pins using a standard I2C interface.
• 8-Bit Remote I/O Ports: Provides eight programmable digital input/output lines.
• Power-Up Input Default State: I/O pins default to inputs during startup for safer initialization.
• Direct LED Drive Capability: Latched outputs can directly drive LEDs without additional logic.
• Interrupt Support: Active LOW open-drain interrupt output improves event-driven processing.
• Flexible Addressing: Supports eight programmable slave addresses for multi-device systems.
• Low-Power Embedded Integration: Suitable for compact and energy-efficient electronics designs.

Technical Specifications:
• Device Type: I2C-Bus to Parallel Port Expander
• Interface Type: I2C-Bus
• I2C Speed: 100kHz Standard-Mode I2C

Electrical Features:
• Operating Supply Voltage: 2.5V to 6V
• Non-Overvoltage Tolerant I/O Held to VDD
• Internal 100µA Current Source

I/O Features:
• 8-Bit Remote I/O Pins
• Default Input State at Power-Up
• Latched Outputs for Direct LED Drive
• Total Package Sink Capability: 80mA

Interrupt & Addressing Features:
• Active LOW Open-Drain Interrupt Output
• Eight Programmable Slave Addresses
• Address Selection via Three Address Pins

Features:
• GPIO expansion over I2C
• LED driving capability
• Interrupt-based event detection
• Multi-device address configuration
• Compact embedded integration
• Reliable low-power operation

Applications:
• GPIO expansion for microcontrollers
• Embedded systems development
• LED control applications
• Sensor interfacing systems
• Industrial automation electronics
• IoT and smart devices
• Home automation systems
• Educational electronics projects
• DIY embedded prototyping

Best For:
Ideal for students, hobbyists, makers, engineers, and embedded developers working on microcontroller systems, automation projects, IoT devices, LED control applications, sensor interfacing, and embedded electronics requiring additional programmable digital I/O capability through an I2C interface.