GBP
The NXP PCF8574AT/3518 is a reliable 8-bit quasi-bidirectional I/O expander, designed to extend GPIO capability via the I²C bus for microcontrollers and embedded systems. Designed for global B2B technical applications, this chip delivers scalable interfacing and control.
Unique Features
- Interface / Protocol: I²C‑bus (Standard‑mode, up to 100 kHz).
- I/O Channels: 8 quasi‑bidirectional ports (P0–P7)
- Supply Voltage: 2.5 V to 6 V – flexible for low‑voltage to 5 V logic systems.
- Interrupt (INT): Active-low open-drain output signals indicate state changes for efficient polling minimization.
- Current Capability: Source/sink up to 300 µA / 25 mA, suitable for driving LEDs or status signals.
- Power Consumption: Ultra‑low standby current (~10 µA) ideal for battery‑powered or power‑sensitive applications.
- Temperature Range: −40 °C to +85 °C – reliable across industrial and demanding environments.
- Package: 16-lead SOIC (SO-16) surface-mount; compact and PC-board friendly.
How It Benefits Users
- Delivers GPIO expansion via I²C, freeing up MCU port resources.
- Simplifies hardware design with quasi-bidirectional I/Os, removing the need for separate direction control.
- Interrupt support offloads polling overhead—ideal for event-driven systems.
- Efficient power management with low standby draw, delivering energy savings.
- Flexible supply compatibility supports a broad range of system voltages.
- Adept at interfacing and LED driving due to latched output capabilities.
Product Use Cases
Well-suited for industrial automation, LED display control, keypads, embedded systems, IoT modules, consumer electronics, and other designs needing expanded I/O with compact packaging and minimal power overhead.