DS4520E+

Overview

The DS4520E+ is a 9-bit nonvolatile I/O expander with 64 bytes of NV user memory controlled by an I²C-compatible serial interface. It operates within a supply voltage range of 2.7V to 5.5V and supports SCL clock frequencies up to 400kHz. The device features open-drain outputs capable of sinking 12mA, with selectable internal pullup resistors ranging from 4.0kΩ to 7.5kΩ. Standby current is typically 2µA. It functions in temperatures from -40°C to +85°C and is housed in a 16-pin TSSOP package.

Feature Summary

• Digitally programmable replacement for hardware jumpers and mechanical switches
• Nonvolatile memory ensures immediate control of digital logic inputs on power-up without host CPU initialization
• Up to eight devices can be multidropped on the same I²C bus using address pins A0, A1, and A2

Applications

• RAM-Based FPGA Bank Switching for Multiple Profiles
• Selecting Between Boot Flash
• Setting ASIC Configurations/Profiles
• Servers and Network Storage
• Routers and Telecom Equipment

Procurement Notes

Verify the specific ordering suffix when purchasing. The base model DS4520E+ indicates standard tube packaging. To obtain tape and reel packaging, add the TRL suffix to the part number (DS4520E+TRL). Confirm RoHS compliance status through official manufacturer documentation or authorized distributors before finalizing procurement orders.

Selection Notes

Select this component when a digitally programmable alternative to mechanical switches is required. Ensure the system controller supports I²C communication at speeds up to 400kHz. Verify that the application environment stays within the specified operating temperature range of -40°C to +85°C and that the supply voltage remains between 2.7V and 5.5V.

Part Context

The DS4520 belongs to the Maxim Integrated DS45xx series of nonvolatile I/O expanders. This family provides persistent state management for digital logic nodes. The DS4520 specifically offers nine bidirectional I/O pins and general-purpose EEPROM storage, distinguishing it from simpler expanders lacking nonvolatile memory capabilities.

Replacement Considerations

The DS4550E+ serves as a functional substitute within the same product family. Both devices provide nine nonvolatile I/O pins and similar electrical characteristics. Designers should verify pin compatibility and software register mapping differences when transitioning between these models.