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M48Z18-100PC1TR Datasheet(PDF) 4 Page - STMicroelectronics

Part # M48Z18-100PC1TR
Description  5V, 64 Kbit (8Kb x 8) ZEROPOWER짰 SRAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48Z18-100PC1TR Datasheet(HTML) 4 Page - STMicroelectronics

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M48Z08, M48Z18
4/16
Figure 4. Block Diagram
OPERATION MODES
The M48Z08/18 also has its own Power-fail Detect
circuit. The control circuitry constantly monitors
the single 5V supply for an out of tolerance condi-
tion. When VCC is out of tolerance, the circuit write
protects the SRAM, providing a high degree of
data security in the midst of unpredictable system
operation brought on by low VCC. As VCC falls be-
low approximately 3V, the control circuitry con-
nects the battery which maintains data until valid
power returns.
Table 2. Operating Modes
Note: X = VIH or VIL; VSO = Battery Back-up Switchover Voltage.
1. See Table 10., page 12 for details.
AI01394
LITHIUM
CELL
VPFD
VCC
VSS
VOLTAGE SENSE
AND
SWITCHING
CIRCUITRY
8K x 8
SRAM ARRAY
A0-A12
DQ0-DQ7
E
W
G
POWER
Mode
VCC
E
G
W
DQ0-DQ7
Power
Deselect
4.75 to 5.5V
or
4.5 to 5.5V
VIH
X
X
High Z
Standby
WRITE
VIL
X
VIL
DIN
Active
READ
VIL
VIL
VIH
DOUT
Active
READ
VIL
VIH
VIH
High Z
Active
Deselect
VSO to VPFD(min)
(1)
X
X
X
High Z
CMOS Standby
Deselect
≤ VSO(1)
X
X
X
High Z
Battery Back-up Mode


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