參數(shù)資料
型號(hào)： M48T212V-85MH1F
廠商： STMICROELECTRONICS
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： REAL TIME CLOCK, PDSO44
封裝： 0.330 INCH, ROHS COMPLIANT, PLASTIC, SOH-44
文件頁數(shù)： 31/35頁
文件大?。?/td> 348K
代理商： M48T212V-85MH1F
Obsolete
Product(s)
- Obsolete
Product(s)
M48T212V
Description
1
Description
The M48T212V is a self-contained device that includes 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 functions and the 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 M48T212V via the E1CON and E2CON signals (see Table 3 on
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 and crystal
damage due to the high temperatures required for device surface-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 battery/crystal package (e.g., SNAPHAT)
part number is “M4TXX-BR12SH” (see Table 20 on page 33).
Caution:
Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the
lithium button-cell battery.
Figure 1.
Logic diagram
AI03019
4
A0-A3
A
DQ0-DQ7
VCC
M48T212V
G
VSS
8
EX
E2CON
E1CON
W
RSTIN2
RSTIN1
RST
IRQ/FT
VOUT
WDI
E
VCCSW
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參數(shù)描述
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