FM22LD16-55-BG is a 4-Mbit (256K × 16) F-RAM memory. It is a non-volatile memory that reads and writes similar to a standard SRAM. A ferroelectric random access memory or F-RAM is non-volatile, which means that data is retained after power is removed. It provides data retention for over 151 years while eliminating the reliability concerns, functional disadvantages, and system design complexities of battery-backed SRAM (BBSRAM). Fast write timing and high write endurance make the F-RAM superior to other types of memory. The FM22LD16 operation is similar to that of other RAM devices and therefore, it can be used as a drop-in replacement for a standard SRAM in a system. The FM22LD16 includes a low voltage monitor that blocks access to the memory array when VDD drops below VDD min. The memory is protected against inadvertent access and data corruption under this condition. The device also features software-controlled write protection.