DS4550:I²C and JTAG Nonvolatile 9-Bit I/O Expander Plus Memory

The DS4550 is a 9-bit, nonvolatile (NV) I/O expander with 64 bytes of NV user memory controlled by either an I²C-compatible serial interface or an IEEE® 1149.1 JTAG port. The DS4550 offers a digitally programmable alternative to hardware jumpers and mechanical switches that are being used to control digital logic nodes. Each I/O pin is independently configurable. The outputs are open drain with selectable pullups. Each output has the ability to sink up to 16mA, and since the device is NV, it powers up in the desired state allowing it to control digital logic inputs immediately on powerup without having to wait for the host CPU to initiate control.

Key Features
  • Programmable Replacement for Mechanical Jumpers and Switches
  • Nine NV Inputs/Outputs
  • 64-Byte NV User Memory (EEPROM)
  • I²C-Compatible Serial Interface and JTAG
  • Up to 8 Devices can be Multidropped on the Same I²C Bus
  • IEEE 1149.1 Boundary Scan Compliant
  • Open-Drain Outputs with Configurable Pullups
  • Outputs Capable of Sinking 16mA
  • Low Power Consumption
  • Wide Operating Voltage Range: 2.7V to 5.5V
  • Operating Temperature Range: -40°C to +85°C
DS4550: Typical Operating Circuit
DS4550: Typical Operating Circuit
  • 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
titleDownload file
DS4550 Data SheetDS4550.pdf
Part NumberInterfaceI/OInputsOutputsDrive Current
minmaxSee Notes
DS4550Serial - I2C Compatible999162.75.5TSSOP/20$1.91 @1k
Quality and Environmental Data
Related Products
  • DS4520:9-Bit I²C Nonvolatile I/O Expander Plus Memory
  • DS4510:CPU Supervisor with Nonvolatile Memory and Programmable I/O
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS4550ENo Longer AvailableDS4550E+TSSOP,;20 pin;45.2 mm²-40°C to +85°CNo
DS4550E+ActiveTSSOP,;20 pin;45.2 mm²-40°C to +85°CLead Free
DS4550E+T&RActiveTSSOP,;20 pin;45.2 mm²-40°C to +85°CLead Free
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DS4550.pdf DS4550
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