M48T201Y-70MH1 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M48T201Y-70MH1 Datasheet PDF : 35 Pages
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M48T201Y, M48T201V
1
Description
Description
Caution:
The M48T201Y/V are self-contained devices that include a real time clock (RTC),
programmable alarms, a watchdog timer, and a square wave output which provides control
of up to 512K x 8 of external low-power static RAM. Access to all RTC functions and the
external RAM is the same as conventional bytewide SRAM. The 16 TIMEKEEPER®
registers offer year, month, date, day, hour, minute, second, calibration, alarm, century,
watchdog, and square wave output data. Externally attached static RAMs are controlled by
the M48T201Y/V via the GCON and ECON signals.
The 44-pin, 330mil SOIC provides sockets with gold plated contacts at both ends for direct
connection to a separate SNAPHAT® housing containing 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.
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 separately in plastic
anti-static tubes or in Tape & Reel form. For the 44-lead SOIC, the battery/crystal package
(e.g., SNAPHAT) part number is “M4Txx-BR12SH” (see Table 19 on page 33).
Do not place the SNAPHAT battery/crystal top in conductive foam as this will drain the
lithium button-cell battery.
Figure 1. Logic diagram
VCC
19
A0-A18
WDI
W
E
G
RSTIN1
RSTIN2
M48T201Y
M48T201V
8
DQ0-DQ7
IRQ/FT
RST
GCON
ECON
SQW
VOUT
VSS
AI02240
5/35
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