PCA9500PW,118

I/o Expanders Overview

The PCA9500PW,118 is an 8-bit I/O expander with an integrated 2-kbit EEPROM in a TSSOP16 package. It operates on a supply voltage of 2.5 V to 3.6 V and supports I2C/SMBus interfaces up to 400 kHz. The device features eight quasi-bidirectional I/O pins, three hardware address pins (A0-A2), and a write control pin (WC). It includes internal power-on reset, noise filters on SCL/SDA inputs, and ESD protection exceeding 2000 V HBM. The component functions as two separate devices on the bus: an I/O expander and an EEPROM.

I/o Expanders Feature Summary

• Integrates 8-bit I/O expansion with 2-kbit non-volatile memory for board configuration and diagnostics
• Supports hot insertion and provides glitch-free power-up behavior
• Features 5 V tolerant inputs and outputs for flexible system interfacing

I/o Expanders Applications

• Board version tracking and manufacturing data storage
• Multi-card systems in telecommunications and networking infrastructure
• General-purpose integrated I/O with memory capabilities

I/o Expanders Procurement Notes

Verify the ordering suffix ,118 corresponds to the reel packing method specified in the datasheet. Confirm the package type matches the required PCB footprint. Ensure the operating voltage range aligns with the target system design. Check RoHS compliance status if required by local regulations.

I/o Expanders Selection Notes

Select this component when both GPIO expansion and persistent storage are needed on a single I2C bus address space. Consider the PCA9501 if interrupt functionality or higher device density is required. Verify that the 2.5 V to 3.6 V supply range meets the system's power constraints.

I/o Expanders Part Context

The PCA9500 serves as a drop-in replacement for the PCF8574 while adding integrated EEPROM capabilities. It allows the bus master to access GPIO and memory registers as distinct devices using fixed slave addresses compatible with legacy PCF8574 and PCF8582C-2 protocols.

I/o Expanders Replacement Considerations

The PCA9501 is a functional alternative offering interrupt output support. Other variants include PCA9500D (SO16) and PCA9500BS (HVQFN16) for different packaging requirements.