DS1212 Dallas Semiconducotr, DS1212 Datasheet
DS1212
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DS1212 Summary of contents
Page 1
... Power Fail PF DESCRIPTION The DS1212 Nonvolatile Controller x16 Chip is a CMOS circuit that solves the application problem of converting CMOS RAMs into nonvolatile memories. Incoming power is monitored for an out-of- tolerance condition. When such a condition is detected, the chip enables are inhibited to accomplish write protection and the battery is switched on to supply the RAMs with uninterrupted power ...
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... By combining the DS1212 Nonvolatile Controller chip and lithium batteries, nonvolatile RAM operation can be achieved for CMOS memories. OPERATION The DS1212 performs six circuit functions required to decode and battery back up a bank RAMs. First, the 4-to-16 decoder provides selection of one of 16 RAMs. Second, a switch is provided to direct power from the battery or V drop of less than 0 ...
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... DS1212 CE14 CE15 ...
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... UNITS NOTES 5 +0 4.75 to 5.5V PIN 3 = GND) = 4.5 to 5.5V, PIN MAX UNITS NOTES ,10 +1.0 µA +1.0 µA mA 4.0 mA 4.74 V 4.49 V (0°C to 70°C; V < V CCI MAX UNITS NOTES V 0.1 µA 100 µA 6, 10, 11 DS1212 CCO BAT ...
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... 300 PFL 25°C) A MAX UNITS NOTES 4.5 to 5.5V, PIN MAX UNITS NOTES < 4.75V, PIN 3 = GND) CCI < 4.5V, PIN CCI MAX UNITS NOTES 125 ms µs µs µs 1.5 µs µs DS1212 ) CCO CCO 7, 8 ...
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... TIMING DIAGRAM: DECODER TIMING DIAGRAM: POWER-UP TIMING DIAGRAM: POWER-DOWN DS1212 ...
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... For applications where higher currents are required, please see the Battery Manager chip data sheet (DS1259). 11. The DS1212 has a 5 kohm resistor in series with the battery input. As current from the battery increases over 100 A, the voltage drop will increase proportionately. The device cannot be damaged by higher currents in the battery path ...