bq4014

The CMOS bq4014 is a nonvolatile 2,097,152-bit static RAM organized as 262,144 words by 8 bits.  The integral control circuitry and lithium energy source provide reliable nonvolatility coupled with the unlimited write cycles of standard SRAM.


The control circuitry constantly of bq4014 monitors the single 5V supply for an out-of-tolerance condition.  When V_CC falls out of tolerance, the SRAM is unconditionally write-protected to prevent inadvertent write operation. At this time the integral energysource is switched on to sustain the memory until after V_CC returns valid.


The bq4014 uses extremely low standby current CMOS SRAMs, coupled with small lithium coin cells to provide nonvolatility without long write-cycle times and the write-cycle limitations associated with EEPROM.


The bq4014 requires no external circuitry and is compatible with the industry-standard 2Mb SRAM pinout.