HMN328D

NOTE: Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation should be restricted to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to higher than recommended voltage for extended periods of time could affect device reliability.

The HMN328D nonvolatile SRAM is a 262,144-bit static RAM organized as 32,768 bytes by 8 bits.  The HMN328D has a self-contained lithium energy source provide reliable non-volatility coupled with the unlimited  rite cycles of standard SRAM and integral control circuitry which constantly monitors the single 5V supply for an out- ftolerance condition. When such a condition occurs, the lithium energy source is automatically switched on to sustain the memory until after V_CC returns valid and write protection is unconditionally enabled to prevent garbled data. In  ddition the SRAM is unconditionally write-protected to prevent an inadvertent write operation. At this time the integral energy  ource is switched on to sustain the memory until after V_CC returns valid.

The HMN328D uses extremely low standby current CMOS SRAM's, coupled with small lithium coin cells to provide  onvolatility without long write-cycle times and the write-cycle limitations associated with EEPROM.