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M48T212Y-70MH1E Datasheet(PDF) 4 Page - STMicroelectronics |
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M48T212Y-70MH1E Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 32 page  M48T212Y, M48T212V 4/32 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® 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 M48T212Y/V via the E1CON and E2CON sig- nals (see Table 3., page 8). The 44-pin, 330mil SOIC provides sockets with gold plated contacts at both ends for direct con- nection to a separate SNAPHAT® housing con- 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. 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 is “M4TXX-BR12SH” (see Table 20., page 30). Caution: Do not place the SNAPHAT battery/crys- tal top in conductive foam, as this will drain the lith- ium button-cell battery. |
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