PCF8574AP,112

I/o Expanders Overview

The PCF8574AP,112 is an NXP remote 8-bit I/O expander for the I2C-bus with interrupt output. It provides eight quasi-bidirectional ports operating between 2.5 V and 6 V. The device features a 100 kHz I2C interface, three hardware address inputs, and an active LOW open-drain interrupt output. It operates within a temperature range of -40 °C to +85 °C. The DIP16 package offers a total package sink capability of 80 mA. Static standby current is typically 2.5 µA.

I/o Expanders Feature Summary

• Eight quasi-bidirectional I/O ports defaulting to inputs at power-up
• Active LOW open-drain interrupt output for input state change notification
• Low standby current consumption suitable for mobile applications
• Latch-up testing exceeding 100 mA per JEDEC standard JESD78

I/o Expanders Applications

• LED signs and displays
• Industrial control systems
• Keypads
• Medical equipment
• PLC (Programmable Logic Controllers)

I/o Expanders Procurement Notes

Verify the specific ordering part number PCF8574AP,112 against the manufacturer's official documentation to confirm the DIP16 package configuration. Ensure that the required supply voltage falls within the 2.5 V to 6 V operational range. Confirm that the system design accommodates the 100 kHz I2C bus speed limitation and the 80 mA total package sink current capability.

I/o Expanders Selection Notes

Select this component when a drop-in replacement for legacy designs requiring 8-bit expansion via I2C is necessary. The PCF8574AP variant utilizes a distinct fixed slave address portion compared to the PCF8574, allowing up to 16 devices on a single bus. Consider the DIP16 package if through-hole mounting is required. Verify that the application does not require higher I2C speeds or greater drive currents than the 80 mA limit.

I/o Expanders Part Context

The PCF8574AP,112 belongs to the PCF8574/74A family of remote I/O expanders. The 'AP' designation indicates the DIP16 plastic dual in-line package. This series is functionally identical to the PCF8574 but uses a different fixed portion of the slave address (0x70-0x7F) to prevent conflicts on shared I2C buses. It serves as a foundational component for expanding GPIO capabilities in resource-constrained embedded systems.

I/o Expanders Replacement Considerations

NXP PCA9674/74A and PCA9670 are documented migration paths offering higher I2C frequencies and increased sink currents. These newer components provide enhanced performance while maintaining functional compatibility with existing I2C-based designs.