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M41T256YMT7TR Datasheet(PDF) 4 Page - STMicroelectronics |
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M41T256YMT7TR Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 27 page M41T256Y 4/27 SUMMARY DESCRIPTION The M41T256Y Serial TIMEKEEPER® SRAM is a low power 256 Kbit static CMOS SRAM organized as 32K words by 8 bits. A built-in 32.768kHz oscil- lator (external crystal controlled) and 8 bytes of the SRAM (see Table 3., page 14) are used for the clock/calendar function and are configured in bina- ry coded decimal (BCD) format. Addresses and data are transferred serially via a two line, bi-directional I2C interface. The built-in address register is incremented automatically af- ter each WRITE or READ data byte. The M41T256Y has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power fail- ure occurs. The energy needed to sustain the SRAM and clock operations can be supplied by a lithium button-cell supply when a power failure oc- curs. Functions available to the user include a non-volatile, time-of-day clock/calendar, and Pow- er-on Reset. The eight clock address locations contain the year, month, date, day, hour, minute, second, and tenths/hundredths of seconds in 24- hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically. The first clock address loca- tion (7FF8h) stores the clock software calibration settings as well as the Write Clock Bit. The M41T256Y is supplied in a 44-lead SOIC SNAPHAT® package (MH - which integrates both crystal and battery in a single SNAPHAT top) or a 44-pin “hatless” SOIC (MT). 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/crystal package to be mounted on top of the SOIC package after the completion of the sur- face-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 also keyed to prevent reverse insertion. The 44-pin SOIC and crystal/battery packages are shipped separately in plastic, anti-static tubes or in Tape & Reel form. For the 44-lead SOIC, the battery/crys- tal package (e.g., SNAPHAT) part number is “M4Txx-BR12SH” (see Table 15., page 25). Caution: Do not place the SNAPHAT battery/crys- tal top in conductive foam, as this will drain the lith- ium, button-cell battery. Figure 3. Logic Diagram Note: 1. For 44-pin SNAPHAT (MT) package only. Table 1. Signal Names Note: 1. For 44-pin SNAPHAT (MT) package only. AI04754b SCL VCC M41T256Y VSS SDA TP FT RST VBAT (1) XI (1) XO (1) XI(1) Oscillator Input XO(1) Oscillator Output FT Frequency Test (Open drain) RST Reset Output (Open drain) SCL Serial Clock Input SDA Serial Data Input/Output VCC Supply Voltage VBAT (1) Battery Supply Voltage VSS Ground TP Tamper Input |
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