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M48Z129V датащи(PDF) 5 Page - STMicroelectronics

номер детали M48Z129V
подробное описание детали  5.0V OR 3.3V, 1 Mbit (128 Kb x 8) ZEROPOWER SRAM
PDF  16 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48Z129V датащи(HTML) 5 Page - STMicroelectronics

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M48Z129Y*, M48Z129V
Figure 4. Block Diagram
OPERATION MODES
The M48Z129Y/V also has its own Power-Fail De-
tect circuit. This control circuitry constantly moni-
tors the supply voltage for an out of tolerance
condition. When VCC is out of tolerance, the circuit
write protects the SRAM, providing data security in
the midst of unpredictable system operation. As
VCC falls, the control circuitry automatically switch-
es to the battery, maintaining data until valid power
is restored.
Table 2. Operating Modes
Note: X = VIH or VIL; VSO = Battery Back-up Switchover Voltage.
1. See Table 10., page 12 for details.
AI03608
RST
VSS
VOLTAGE SENSE
AND
SWITCHING
CIRCUITRY
131,072 x 8
SRAM ARRAY
A0-A16
DQ0-DQ7
E
W
G
POWER
VCC
BL
E
INTERNAL
BATTERY
Mode
VCC
E
G
W
DQ0-DQ7
Power
Deselect
4.5 to 5.5V
or
3.0to 3.6V
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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