GENERAL DESCRIPTION

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 write cycles of standard SRAM and integral control circuitry which constantly monitors the single 5V supply for an out -of tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on to sustain the memory until after VCC returnsvalid and write protection is unconditionally enabled to prevent garbled data.

FEATURES

Access time : 70, 85, , 120, 150ns

High-density design : 256Kbit Design

Battery internally isolated until power is applied

Industry-standard 28-pin 32K x 8 pinout

Unlimited write cycles

Data retention in the absence of VCC

10-years minimum data retention in absence of power

Automatic write-protection during power-up/power-down cycles

Data is automatically protected during power loss

Industrial temperature operation