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
DS4520 Applications
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
DS4520 Description
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.
