DS4520 memory equivalent, i/o expander plus memory.
* Programmable Replacement for Mechanical Jumpers and Switches
* Nine NV Input/Output Pins
* 64-Byte NV User Memory (EEPROM)
* I2C-Compatible Serial I.
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* RAM-Based FPGA Bank Switching for Multiple Profiles
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* Selecting Between Boot Flash
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* Settin.
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