PCA9501PW,112

Overview

The PCA9501PW,112 is an 8-bit I/O expander with integrated 2-kbit EEPROM in a TSSOP20 package. It operates on a 2.5 V to 3.6 V supply and supports I2C-bus/SMBus interfaces up to 400 kHz. The device features eight quasi-bidirectional I/O pins, six hardware address pins allowing up to 64 devices on the bus, and an active LOW open-drain interrupt output. It includes internal power-on reset, noise filters on SCL/SDA inputs, and ESD protection exceeding 2000 V HBM.

Feature Summary

• Replacement for PCF8574 with integrated 2-kbit EEPROM
• Supports hot insertion for removable cards
• Active LOW interrupt output triggered by input state changes

Applications

• Board version tracking and configuration
• Multi-card systems in telecom and networking infrastructure
• Field recall and troubleshooting functions for installed boards

Procurement Notes

Verify the specific ordering suffix '112' against official NXP documentation to confirm availability status, as datasheets indicate this variant may be No Longer Manufactured. Ensure compatibility with required packaging formats and environmental certifications such as RoHS compliance before finalizing procurement plans.

Selection Notes

Select this component when an 8-bit I/O expander with non-volatile memory storage is required. It is suitable for applications needing board configuration data retention and interrupt-driven status reporting over standard I2C or SMBus protocols within the specified voltage range.

Part Context

This part belongs to the PCA9501 series of I/O expanders. Other variants include the PCA9501D (SO20) and PCA9501BS (HVQFN20). The series provides identical functional capabilities across different package types, allowing designers to choose based on thermal and spatial constraints while maintaining software compatibility.

Replacement Considerations

The PCA9501 serves as a direct replacement for the PCF8574 with added EEPROM functionality. Verify pinout compatibility if substituting other generic I/O expanders, as the PCA9501 requires specific handling for its write control pin and interrupt logic.