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DS1251YP Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS1251YP Datasheet(HTML) 1 Page - Dallas Semiconductor |
1 / 22 page 1 of 22 112801 FEATURES § Real-time clock keeps track of hundredths of seconds, minutes, hours, days, date of the month, months, and years § 512k x 8 NV SRAM directly replaces volatile static RAM or EEPROM § Embedded lithium energy cell maintains calendar operation and retains RAM data § Watch function is transparent to RAM operation § Month and year determine the number of days in each month; valid up to 2100 § Over 10 years of data retention in the absence of power § Full 10% operating range § Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time § DIP Module only – Standard 32-pin JEDEC pinout – Upward comparable with the DS1248 § PowerCap ® Module Board only – Surface mountable package for direct connection to PowerCap containing battery and crystal – Replaceable battery (PowerCap) – Pin for pin compatible with other densities of DS124XP phantom clocks PIN ASSIGNMENT DS1251/DS1251P 4096k NV SRAM with Phantom Clock www.maxim-ic.com 13 1 2 3 4 5 6 7 8 9 10 11 12 14 31 32-Pin Encapsulated Package 740mil Flush A14 A7 A5 A4 A3 A2 A1 A0 DQ1 DQ0 VCC A15 A17 WE A13 A8 A9 A11 OE A10 CE DQ7 DQ5 DQ6 32 30 29 28 27 26 25 24 23 22 21 19 20 A16 A12 A6 A18/RST DQ2 GND 15 16 18 17 DQ4 DQ3 1 RST 2 3 A15 A16 NC VCC WE OE CE DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 GND 4 5 6 7 8 9 10 11 12 13 14 15 16 17 A17 A14 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 34 A18 X1 GND VBAT X2 34-Pin PowerCap Module Board (Uses DS9034PCX PowerCap) PowerCap is a registered trademark of Dallas Semiconductor. |
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