DS4520E

Overview

The DS4520E is a 9-bit nonvolatile I/O expander manufactured by Analog Devices Inc./Maxim Integrated. It integrates nine digital I/O pins with 64 bytes of EEPROM-based user memory, controlled via an I2C-compatible serial interface. The device operates within a supply voltage range of 2.7 V to 5.5 V and supports clock frequencies up to 400 kHz. It features open-drain outputs capable of sinking 12 mA each, with configurable pull-ups. Packaged in a TSSOP-16 format, it functions without interrupt outputs and maintains state across power cycles.

Feature Summary

• Nonvolatile storage retains configuration data without continuous power
• Digital programmable replacement for hardware jumpers and mechanical switches
• Independent pin configuration allows flexible logic control
• Open-drain outputs support direct interfacing with various logic levels

Applications

• Network memory devices requiring persistent configuration
• PC peripheral control systems
• Server and router/switch management interfaces
• Telecommunications equipment initialization

Procurement Notes

Verify the specific suffix (e.g., E, +, TRL) against the design specification, as packaging and environmental compliance may vary. Confirm availability status through authorized distributors, as stock levels fluctuate. Ensure the I2C address configuration aligns with the system bus requirements before integration.

Selection Notes

Select this component when persistent I/O state is required without host CPU intervention at startup. The 9-bit width suits applications needing moderate expansion. Verify that the open-drain output current capability meets load requirements. Consider the TSSOP-16 package constraints for PCB layout. Compare against volatile alternatives if power loss tolerance is not critical.

Part Context

The DS4520E belongs to the DS45xx series of nonvolatile I/O expanders. It serves as a bridge between microcontrollers and digital logic nodes, eliminating the need for external latches or complex initialization sequences. Its EEPROM architecture ensures reliability in embedded environments where configuration retention is essential during power transitions.

Replacement Considerations

Direct substitutes include other models within the DS4520 family, such as DS4520E+ or DS4520E+TRL, which share identical functional specifications but may differ in packaging or RoHS compliance. Cross-family replacements require verification of pin compatibility and memory size.