M48T08-150PC1TR STMICROELECTRONICS [STMicroelectronics], M48T08-150PC1TR Datasheet - Page 4

• Manufacturer Part Number: M48T08-150PC1TR
• Description: CMOS 8K x 8 TIMEKEEPER SRAM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M48T08, M48T08Y, M48T18
SUMMARY DESCRIPTION
The M48T08/18/08Y TIMEKEEPER
8K x 8 non-volatile static RAM and real time clock
which is pin and functional compatible with the
DS1643. The monolithic chip is available in two
special packages to provide a highly integrated
battery backed-up memory and real time clock so-
lution.
The M48T08/18/08Y is a non-volatile pin and func-
tion equivalent to any JEDEC standard 8K x 8
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
M48T08/18/08Y silicon with a quartz crystal and a
long- life lithium button cell in a single package.
Figure 3. Logic Diagram
4/27
A0-A12
E1
E2
W
G
13
V CC
V SS
M48T08Y
M48T08
M48T18
8
®
RAM is an
DQ0-DQ7
INT
AI01020
The 28-pin, 330mil SOIC provides sockets with
gold plated contacts at both ends for direct con-
nection to a separate SNAPHAT
taining the battery and crystal. 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. Inser-
tion of the SNAPHAT housing after reflow pre-
vents potential battery and crystal damage due to
the high temperatures required for device surface-
mounting. The SNAPHAT housing is keyed to pre-
vent reverse insertion.
The SOIC and battery/crystal packages are
shipped separately in plastic anti-static tubes or in
Tape & Reel form. For the 28 lead SOIC, the bat-
tery/crystal package (e.g., SNAPHAT) part num-
ber is “M4T28-BR12SH” or “M4T32-BR12SH”
(see
Table 1. Signal Names
A0-A12
DQ0-DQ7
INT
E1
E2
G
W
V
V
CC
SS
Table 17., page
Address Inputs
Data Inputs / Outputs
Power Fail Interrupt (Open Drain)
Chip Enable 1
Chip Enable 2
Output Enable
WRITE Enable
Supply Voltage
Ground
25).
®
housing con-