ANV31A81ASC66 T vs ANV31A81ASC66 R vs ANV31A81ASK66 R

PartNumber	ANV31A81ASC66 T	ANV31A81ASC66 R	ANV31A81ASK66 R
Description	NVRAM Non volatile 66 MHz 256Kb nvSRAM SPI interface	NVRAM Non volatile 66 MHz 256Kb nvSRAM SPI interface	NVRAM Non volatile 66 MHz 256Kb nvSRAM SPI interface