M48Z512A-70CS9 datasheet(3/17 Pages) STMICROELECTRONICS

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M48Z512A, M48Z512AY

The M48Z512A/512AY also has its own Power-fail

Detect circuit. The control circuitry constantly mon-

itors the single 5V supply for an out of tolerance

condition. When VCC is out of tolerance, the circuit

write protects the SRAM, providing a high degree

of data security in the midst of unpredictable sys-

tem operation brought on by low VCC.As VCC falls

below approximately 3V, the control circuitry con-

nects the battery which maintains data until valid

power returns.

The ZEROPOWER RAM replaces industry stan-

dard SRAMs. It provides the nonvolatility of

PROMs without any requirement for special write

Figure 3. Block Diagram

AI02045

INTERNAL

BATTERY

VCC

VSS

VOLTAGE SENSE

AND

SWITCHING

CIRCUITRY

512K x 8

SRAM ARRAY

A0-A18

DQ0-DQ7

POWER

timing or limitations on the number of writes that

can be performed.

The M48Z512A/512AY has its own Power-fail De-

tect Circuit. The control circuitry constantly moni-

tors the single 5V supply for an out of tolerance

condition. When VCC is out of tolerance, the circuit

write protects the SRAM, providing a high degree

of data security in the midst of unpredictable sys-

tem operations brought on by low VCC.As VCC

falls below approximately 3V, the control circuitry

connects the battery which sustains data until valid

power returns.

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