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M48Z35AY Datasheet(PDF) 3 Page - STMicroelectronics

Part No. M48Z35AY
Description  256 Kbit 32Kb x8 ZEROPOWER SRAM
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M48Z35AY, M48Z35AV
The M48Z35AY/35AV is a non-volatile pin and
function equivalent to any JEDEC standard 32K x8
SRAM. It also easily fits into many ROM, EPROM,
and EEPROM sockets, providing the non-volatility
of PROMs without any requirement for special
write timing or limitations on the number of writes
that can be performed. The 28 pin 600mil DIP
CAPHAT™ houses the M48Z35AY/35AV silicon
with a long life lithium button cell in a single pack-
age.
The 28 pin 330mil SOIC provides sockets with
gold plated contacts at both ends for direct con-
nection to a separate SNAPHAT housing contain-
ing the battery. The unique design allows the
SNAPHAT battery package to be mounted on top
of the SOIC package after the completion of the
surface mount process. Insertion of the SNAPHAT
housing after reflow prevents potential battery
damage due to the high temperatures required for
device surface-mounting. The SNAPHAT housing
is keyed to prevent reverse insertion.
Table 3. Operating Modes (1)
Note: 1. X = VIH or VIL; VSO = Battery Back-up Switchover Voltage.
2. See Table 7 for details.
Mode
VCC
E
G
W
DQ0-DQ7
Power
Deselect
4.5V to 5.5V
or
3.0V to 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)
(2)
X
X
X
High Z
CMOS Standby
Deselect
≤ VSO
X
X
X
High Z
Battery Back-up Mode
Figure 3. Block Diagram
AI01619B
LITHIUM
CELL
VPFD
VCC
VSS
VOLTAGE SENSE
AND
SWITCHING
CIRCUITRY
32K x 8
SRAM ARRAY
A0-A14
DQ0-DQ7
E
W
G
POWER




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