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M48Z512AYSH Datasheet(PDF) 3 Page - STMicroelectronics

Part # M48Z512AYSH
Description  4 Mbit 512Kb x8 ZEROPOWER SRAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48Z512AYSH Datasheet(HTML) 3 Page - 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
E
VCC
VSS
VOLTAGE SENSE
AND
SWITCHING
CIRCUITRY
512K x 8
SRAM ARRAY
A0-A18
DQ0-DQ7
W
G
POWER
E
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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