PCA9500D

I/o Expanders Overview

The PCA9500D is an 8-bit I/O expander featuring quasi-bidirectional data pins and integrated 2-kbit EEPROM. It operates on a two-wire I²C/SMBus interface with a maximum clock frequency of 400 kHz. The device supports a supply voltage range of 2.5 V to 3.6 V, with a maximum output current of 25 mA per pin and power dissipation of 400 mW. It utilizes a SOIC-16 package and functions within an operating temperature range of -40°C to +85°C. Internal pull-up resistors on address pins allow up to eight devices on the bus.

I/o Expanders Feature Summary

• Drop-in replacement for PCF8574 with integrated 2-kbit EEPROM
• Supports hot insertion for removable card applications
• Internal power-on reset and noise filters on SCL/SDA inputs

I/o Expanders Applications

• Monitoring board-level status
• Activating indicator devices such as LEDs
• Storing error codes or manufacturing data in EEPROM

I/o Expanders Procurement Notes

Verify the specific suffix D indicates the SOIC-16 package variant when sourcing. Confirm RoHS compliance and lead-free status through official manufacturer documentation or authorized distributor certificates. Ensure the ordering part number matches the required package type and environmental specifications for the target application.

I/o Expanders Selection Notes

Select this component when an I²C-compatible I/O expansion solution with non-volatile storage is required. It serves as a direct functional substitute for the PCF8574 while adding EEPROM capabilities. Consider the PCA9501 if interrupt outputs or additional address pins are necessary for complex bus topologies.

I/o Expanders Part Context

The PCA9500 belongs to NXP's family of I²C-bus and SMBus I/O expanders. It combines standard GPIO functionality with embedded memory for diagnostic purposes. The device simplifies system design by reducing pin count requirements on the main processor while providing persistent data storage capabilities.

I/o Expanders Replacement Considerations

The PCA9500 is documented as a drop-in replacement for the PCF8574. For systems requiring interrupt outputs or higher device density on the same bus, the PCA9501 is the designated alternative.