M48Z35-70MH1 STMICROELECTRONICS [STMicroelectronics], M48Z35-70MH1 Datasheet - Page 3

• Manufacturer Part Number: M48Z35-70MH1
• Description: 256 Kbit 32Kb x8 ZEROPOWER SRAM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Table 3. Operating Modes
Note: 1. X = V
Figure 3. Block Diagram
The M48Z35/35Y 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 M48Z35/35Y silicon with a
long life lithium button cell in a single package.
The 28 pin 330mil SOIC provides sockets with
gold plated contacts at both ends for direct con-
Deselect
Write
Read
Read
Deselect
Deselect
Mode
2. See Table 7 for details.
LITHIUM
IH
CELL
or V
IL
V
; V
SO
SO
4.75V to 5.5V
4.5V to 5.5V
to V
= Battery Back-up Switchover Voltage.
V
PFD
V
or
CC
SO
(1)
(min)
VOLTAGE SENSE
SWITCHING
CIRCUITRY
(2)
AND
V CC
V
V
V
V
E
X
X
IH
IL
IL
IL
POWER
V PFD
V
V
G
X
X
X
X
IH
IL
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.
V
V
V
W
X
X
X
SRAM ARRAY
IH
IH
IL
32K x 8
V SS
DQ0-DQ7
High Z
High Z
High Z
High Z
D
D
OUT
IN
M48Z35, M48Z35Y
Battery Back-up Mode
CMOS Standby
Standby
Power
A0-A14
DQ0-DQ7
E
W
G
Active
Active
Active
AI01619B
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