DS1217 DALLAS [Dallas Semiconductor], DS1217 Datasheet
DS1217
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DS1217 Summary of contents
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... See Mech. Drawings Section remote method can be used to retrofit existing systems that have JEDEC 28-pin bytewide memory sites. The DS1217A cartridge has a lifetime energy source to retain data and circuitry needed to automatically protect memory contents. Reading and writing the memory lo- cations is the same as using conventional static RAM. If ...
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... CC inhibited and all accesses are ignored. WRITE MODE The DS1217A is in the write mode whenever both the WE and CE signals are in the active (low) state after ad- dress inputs are stable. The last falling edge to occur of either will determine the start of the write cycle ...
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... CARTRIDGE NUMBERING Table 1 PART NO. DENSITY DS1217A/16K- DS1217A/64K- DS1217A/128K-25 16K x 8 DS1217A/192K-25 24K x 8 DS1217A/256K-25 32K x 8 *Unused address inputs must be held low ( DS1217A UNUSED ADDRESS INPUTS *Address 11, 12, 13, 14 *Address 13, 14 *Address 14 030598 3/8 ...
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... DS1217A ABSOLUTE MAXIMUM RATINGS* Voltage on Any Connection Relative to Ground Operating Temperature Storage Temperature * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability ...
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... Output Active from WE t OEW Data Setup Time t DS Data Hold Time from =5V CC MIN TYP MAX UNITS NOTES 250 ns 250 ns 125 ns 250 125 250 ns 170 100 100 DS1217A 10 030598 5/8 ...
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... DS1217A READ CYCLE ( ADDRESSES OUT WRITE CYCLE 1 (2), (6), ( ADDRESSES OUT D IN WRITE CYCLE 2 (2), ( ADDRESSES COE D OUT D IN 030598 6 ...
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... Under no circumstances are negative undershoots, of any amplitude, allowed when the device is in battery backup mode. t REC DATA RETENTION TIME MIN MAX UNITS 100 125 ms (t MIN MAX UNITS 10 years DS1217A t R NOTES NOTES 9 030598 7/8 ...
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... low or the WE low transition occurs prior to or simultaneously with the CE low transition, the output buffers remains in a high impedance state during this period. 9. Each DS1217A is marked with a 4-digit date code AABB. AA designates the year of manufacture; BB desig- nates the week of manufacture. The expected t 10 ...