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DS1643P Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS1643P Datasheet(HTML) 1 Page - Dallas Semiconductor |
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1 / 14 page  1 of 14 022101 FEATURES Integrated NV SRAM, real time clock, crystal, power-fail control circuit and lithium energy source Clock registers are accessed identically to the static RAM. These registers are resident in the eight top RAM locations. Totally nonvolatile with over 10 years of operation in the absence of power Access times of 70 ns and 100 ns BCD coded year, month, date, day, hours, minutes, and seconds with leap year compensation valid up to 2100 Power-fail write protection allows for ±10% VCC power supply tolerance Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time DS1643 only (DIP Module) – Standard JEDEC byte-wide 8K x 8 RAM pinout DS1643P only (PowerCap Module Board) – Surface mountable package for direct connection to PowerCap containing battery and crystal – Replaceable battery (PowerCap) – Power-fail output – Pin-for-pin compatible with other densities of DS164XP Timekeeping RAM ORDERING INFORMATION DS1643-XXX 28-pin DIP module -70 70 ns access -100 100 ns access *DS1643P-XXX 34-pin PowerCap Module Board -70 70 ns access -100 100 ns access *DS9034PCX PowerCap (Required; must be ordered separately) PIN ASSIGNMENT DS1643/DS1643P Nonvolatile Timekeeping RAM www.dalsemi.com 13 27 28-PIN Encapsulated Package (700-mil Extended) A7 A5 A3 A2 A1 A0 DQ0 DQ1 GND DQ2 VCC WE CE2 A8 A9 A11 OE A10 CE DQ7 DQ6 DQ5 DQ3 DQ4 1 2 3 4 5 6 7 8 9 10 11 12 14 28 26 25 24 23 22 21 20 19 18 17 15 16 A12 A6 A4 NC 1 NC 2 3 NC NC PFO 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 NC NC 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 NC A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 34 NC X1 GND VBAT X2 34-PIN PowerCap Module Board (USES DS9034PCX PowerCap) |
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