The FM22L16 is a 256Kx16 nonvolatile memory thatreads and writes like a standard SRAM. Aferroelectric random access memory or FRAM isnonvolatile, which means that data is retained afterpower is removed. It provides data retention for over10 years while eliminating the reliability concerns,functional disadvantages, and system designcomplexities of battery-backed SRAM (BBSRAM).Fast write timing and high write endurance makeFRAM superior to other types of memory.In-system operation of the FM22L16 is very similarto other RAM devices and can be used as a drop-inreplacement for standard SRAM. Read and writecycles may be triggered by /CE or simply bychanging the address. The FRAM memory isnonvolatile due to its unique ferroelectric memoryprocess. These features make the FM22L16 ideal fornonvolatile memory applications requiring frequentor rapid writes in the form of an SRAM.The FM22L16 includes a low voltage monitor thatblocks access to the memory array when VDD dropsbelow a critical threshold. The memory is protectedagainst an inadvertent access and data corruptionunder this condition. The device also featuressoftware-controlled write protection. The memoryarray is divided into 8 uniform blocks, each of whichcan be individually write protected.The device is available in a 400 mil 44-pin TSOP-IIsurface mount package. Device specifications areguaranteed over industrial temperature range –40°Cto +85°C.
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