General Description
   The DS4550 is a 9-bit, nonvolatile (NV) I/O expander with 64 bytes of NV user memory controlled by either an I2CTM-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.

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

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