M48Z35-70MH1TR STMICROELECTRONICS [STMicroelectronics], M48Z35-70MH1TR Datasheet - Page 3

• Manufacturer Part Number: M48Z35-70MH1TR
• Description: 256 Kbit (32 Kbit x 8) ZEROPOWER SRAM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

DESCRIPTION
The M48Z35/Y ZEROPOWER
x 8, non-volatile static RAM that integrates power-
fail deselect circuitry and battery control logic on a
single die. The monolithic chip is available in two
special packages to provide a highly integrated
battery backed-up memory solution.
The M48Z35/Y 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/Y silicon with
a long life lithium button cell in a single package.
Figure 3. Logic Diagram
A0-A14
W
G
E
15
V CC
V SS
M48Z35Y
M48Z35
®
RAM is a 32 Kbit
8
DQ0-DQ7
AI01616D
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.
The SOIC and battery packages are shipped sep-
arately in plastic anti-static tubes or in Tape & Reel
form.
For the 28 lead SOIC, the battery package (i.e.
SNAPHAT) part number is “M4Z28-BR00SH1.”
Table 1. Signal Names
DQ0-DQ7
A0-A14
V
V
W
G
E
CC
SS
Address Inputs
Data Inputs / Outputs
Chip Enable Input
Output Enable Input
WRITE Enable Input
Supply Voltage
Ground
M48Z35, M48Z35Y
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