PCA9559PW,112

Specialized Overview

The PCA9559PW,112 is a 20-pin CMOS device featuring a 6-bit non-volatile EEPROM register, five hardware pin inputs, and a 5-bit multiplexed output with one latched EEPROM bit. It operates within a supply voltage range of 3.0 V to 3.6 V and supports I2C-bus or SMBus communication at frequencies up to 400 kHz. The component utilizes a TSSOP20 package (SOT360-1) with a body width of 4.4 mm. It includes two address pins allowing up to four devices on the same bus and provides ESD protection exceeding 2000 V HBM.

Specialized Feature Summary

• Integrates a 6-bit internal non-volatile register programmable via I2C-bus for persistent configuration storage.
• Features a 5-bit 2-to-1 multiplexer and a 1-bit latch DIP switch function for system configuration.
• Supports jumperless configuration by replacing physical switches with software-controlled settings.
• Includes an active-low override input that forces all outputs to logic 0.

Specialized Applications

• Mobile and Desktop VID Configuration for processor voltage setting.
• Server and telecom/networking applications requiring remote configuration changes.
• Jumperless configuration of PC motherboards.

Specialized Procurement Notes

Verify the specific ordering suffix against current NXP documentation, as packing methods and availability may have changed. Confirm the device status, as some variants are listed as No Longer Manufactured. Ensure the design accounts for the specific 3.0 V to 3.6 V operating voltage range rather than standard 5 V logic levels.

Specialized Selection Notes

Select this component when non-volatile memory retention is required for system configuration without external power. Verify compatibility with the 3.0 V to 3.6 V supply voltage range. Ensure the application requires only two address pins for bus expansion. Check if the open-drain output types meet the load requirements of the target circuit.

Specialized Part Context

The PCA9559 belongs to the family of I2C-bus EEPROM DIP switches designed to replace physical jumpers. It allows system configuration data to be stored in non-volatile memory and modified remotely. This eliminates the need to physically access equipment cabinets to change hardware settings, streamlining deployment and maintenance processes.

Specialized Replacement Considerations

Public confirmed substitute part numbers: None identified in verified sources.