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M48Z129Y-85PMTR View Datasheet(PDF) - STMicroelectronics

Part Name
Description
Manufacturer
M48Z129Y-85PMTR
ST-Microelectronics
STMicroelectronics ST-Microelectronics
M48Z129Y-85PMTR Datasheet PDF : 16 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Figure 4. Block Diagram
VCC
M48Z129Y*, M48Z129V
A0-A16
POWER
131,072 x 8
E
VOLTAGE SENSE
SRAM ARRAY
AND
SWITCHING
CIRCUITRY
E
INTERNAL
BATTERY
DQ0-DQ7
W
G
RST BL
VSS
AI03608
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
Table 2. Operating Modes
Mode
VCC
E
G
Deselect
VIH
X
WRITE
READ
4.5 to 5.5V
or
3.0to 3.6V
VIL
X
VIL
VIL
READ
VIL
VIH
Deselect VSO to VPFD (min)(1)
X
X
Deselect
≤ VSO(1)
X
X
Note: X = VIH or VIL; VSO = Battery Back-up Switchover Voltage.
1. See Table 10., page 12 for details.
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.
W
DQ0-DQ7
X
High Z
VIL
DIN
VIH
DOUT
VIH
High Z
X
High Z
Power
Standby
Active
Active
Active
CMOS Standby
X
High Z
Battery Back-up Mode
5/16
 

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