9-Bit I²C Nonvolatile I/O Expander Plus Memory

9-Channel, Nonvolatile Port Expander Integrates User-EEPROM

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The DS4520 is a 9-bit nonvolatile (NV) I/O expander with 64 bytes of NV user memory controlled by an I²C-compatible serial interface. The DS4520 offers users a digitally programmable alternative to hardware jumpers and mechanical switches that are being used to control digital logic nodes. Furthermore,the digital state of each pin can be read through the serial interface. Each I/O pin is independently configurable. The outputs are open drain with selectable pullups. Each output has the ability to sink up to 12mA. Since the device is NV, it powers up in the desired state allowing it to control digital logic inputs immediately on power-up without having to wait for the host CPU to initiate control.
DS4520: Typical Operating Circuit DS4520: Typical Operating Circuit Enlarge+

Key Features

  • Programmable Replacement for Mechanical Jumpers and Switches
  • Nine NV Input/Output Pins
  • 64-Byte NV User Memory (EEPROM)
  • I²C-Compatible Serial Interface
  • Up to 8 Devices Can be Multidropped on the Same I²C Bus
  • Open-Drain Outputs with Configurable Pullups
  • Outputs Capable of Sinking 12mA
  • Low Power Consumption
  • Wide Operating Voltage (2.7V to 5.5V)
  • Operating Temperature Range: -40°C to +85°C


  • Network Storage
  • PC Peripherals
  • RAM-Based FPGA Bank Switching for Multiple Profiles
  • Routers/Switches
  • Selecting Between Boot Flash
  • Servers
  • Setting ASIC Configurations/Profiles
  • Telecom Equipment
Part NumberInterfaceI/ODrive Current
minmaxSee Notes
DS4520 Serial - I2C Compatible9122.75.5
$1.45 @1k
See All I/O Port Expanders (31)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 3291 Using DS4510/DS4520/DS4550 to Select Backup Flash Memory

Quality and Environmental Data

Product Reliability Reports: DS4520.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • DS4520E+
  • DS4520E+TRL
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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