PCF8574N 8-Bit I2C I/O Expander DIP-16, 2.5-6V, Texas Instruments

The PCF8574N is a robust 8-bit input/output (I/O) expander designed for I2C (two-line bidirectional bus) applications. It operates with a supply voltage ranging from 2.5V to 6V, making it suitable for a variety of microcontroller-based systems. This device provides general-purpose remote I/O expansion, using the serial clock (SCL) and serial data (SDA) lines to communicate with most microcontrollers. The PCF8574N features an 8-bit quasi-bidirectional I/O port (P0-P7) with latched outputs that offer high-current drive capability, enabling direct control of LEDs without additional drivers. Since the I/Os are quasi-bidirectional, they can be used as inputs or outputs without the need for a data-direction control signal. Upon power-on, the I/Os are set high, and only a current source to VCC is active, ensuring low power consumption.

This expander includes an open-drain interrupt output, which is useful for detecting input changes in real-time applications. It also boasts a low standby-current consumption (maximum 10µA), and its latch-up performance exceeds 100mA per JESD 78, Class II, ensuring reliability in demanding environments. The device comes in a DIP-16 package, making it easy to integrate into breadboards and prototypes.

Typical applications include communications networking, computer peripherals, consumer electronics, industrial automation, process control, and signal processing. It is compatible with a wide range of microcontrollers, simplifying your design process.

Important Notice: The device has limited built-in ESD protection. To prevent electrostatic damage to the MOS gates, keep leads shorted together or store the device in conductive foam during handling or storage.

Specifications

• Function: 8-bit I/O expander for I2C bus
• Interface: I2C (SCL, SDA)
• Supply Voltage Range: 2.5V to 6V
• I/O Ports: 8 (quasi-bidirectional, P0-P7)
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