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M48T35AYSH Datasheet(PDF) 2 Page - STMicroelectronics |
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M48T35AYSH Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 19 page  M48T35AY, M48T35AV 2/19 Figure 2A. DIP Connections A1 A0 DQ0 A7 A4 A3 A2 A6 A5 A13 A10 A8 A9 DQ7 W A11 G E DQ5 DQ1 DQ2 DQ3 VSS DQ4 DQ6 A12 A14 VCC AI02798B 8 1 2 3 4 5 6 7 9 10 11 12 13 14 16 15 28 27 26 25 24 23 22 21 20 19 18 17 M48T35AY M48T35AV Figure 2B. SOIC Connections AI02799 8 2 3 4 5 6 7 9 10 11 12 13 14 22 21 20 19 18 17 16 15 28 27 26 25 24 23 1 A1 A0 DQ0 A7 A4 A3 A2 A6 A5 A13 A10 A8 A9 DQ7 W A11 G E DQ5 DQ1 DQ2 DQ3 VSS DQ4 DQ6 A12 A14 VCC M48T35AY M48T35AV completion of the surface mount process. Inser- tion of the SNAPHAT housing after reflow pre- vents potential battery and crystal damage due to the high temperatures required for device surface- mounting. The SNAPHAT housing is keyed to pre- vent reverse insertion. The SOIC and battery/crystal packages are shipped separately in plastic anti-static tubes or in Tape & Reel form. For the 28 lead SOIC, the battery/crystal package (i.e. SNAPHAT) part number is "M4T28- BR12SH1". As Figure 3 shows, the static memory array and the quartz controlled clock oscillator of the M48T35AY/35AV are integrated on one silicon chip. The two circuits are interconnected at the up- per eight memory locations to provide user acces- sible BYTEWIDE™ clock information in the bytes with addresses 7FF8h-7FFFh. The clock locations contain the year, month, date, day, hour, minute, and second in 24 hour BCD for- mat. Corrections for 28, 29 (leap year), 30, and 31 day months are made automatically. Byte 7FF8h is the clock control register. This byte controls user access to the clock information and also stores the clock calibration setting. Table 1. Signal Names A0-A14 Address Inputs DQ0-DQ7 Data Inputs / Outputs E Chip Enable G Output Enable W Write Enable VCC Supply Voltage VSS Ground The 28 pin 600mil DIP CAPHAT™ houses the M48T35AY/35AV silicon with a quartz crystal and a long life lithium button cell in a single package. The 28 pin 330mil SOIC provides sockets with gold plated contacts at both ends for direct con- nection to a separate SNAPHAT housing contain- ing the battery and crystal. The unique design allows the SNAPHAT battery package to be mounted on top of the SOIC package after the |
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