M48T212V-70MH1 STMICROELECTRONICS [STMicroelectronics], M48T212V-70MH1 Datasheet - Page 4

• Manufacturer Part Number: M48T212V-70MH1
• Description: 5V/3.3V TIMEKEEPER CONTROLLER Supervisor
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M48T212Y, M48T212V
DESCRIPTION
The M48T212Y/V are self-contained devices that
include a real time clock (RTC), programmable
alarms, a watchdog timer, and two external chip
enable outputs which provide control of up to four
(two in parallel) external low-power static RAMs.
Access to all TIMEKEEPER
external RAM is the same as conventional byte-
wide SRAM. The 16 TIMEKEEPER Registers offer
Century, Year, Month, Date, Day, Hour, Minute,
Second, Calibration, Alarm, Watchdog, and Flags.
Externally attached static RAMs are controlled by
the M48T212Y/V via the E1
nals (see
The 44-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
4/32
Table 3., page
8).
CON
®
functions and the
and E2
®
housing con-
CON
sig-
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 and crystal damage due
to the high temperatures required for device sur-
face-mounting. The SNAPHAT housing is keyed
to prevent reverse insertion.
The SOIC and battery/crystal packages are
shipped separately in plastic anti-static tubes or in
Tape & Reel form. For the-44 lead SOIC, the bat-
tery/crystal package (e.g., SNAPHAT) part num-
ber
20., page
Caution: Do not place the SNAPHAT battery/crys-
tal top in conductive foam, as this will drain the lith-
ium button-cell battery.
is
30).
“M4TXX-BR12SH”
(see
Table