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DS1286I Datasheet(PDF) 4 Page - Dallas Semiconductor |
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DS1286I Datasheet(HTML) 4 Page - Dallas Semiconductor |
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4 / 18 page  DS1284/DS1286 4 of 18 PIN DIP EDIP PLCC NAME FUNCTION 28 28 28 VCC Primary Power-Supply Input. When voltage is applied within normal limits, the device is fully accessible and data can be written and read. When a backup supply is connected to the device and VCC is below VTP, read and writes are inhibited. However, the timekeeping function continues unaffected by the lower input voltage. Figure 1. Block Diagram Internal Registers Internal Counters Internal Registers Oscillator ÷ 8 ÷ 40.96 ÷ 40.96 PF delay ÷ 10 Update seconds through years and check time of day alarm User RAM 50 Bytes Command Register External Registers, clock, calendar, time of day alarm Power Switch ÷ 4 Swap pins External Registers Hundredths of Seconds External Registers Watchdog Alarm Internal Counters Data I/O Buffers A0-A5 CE OE WE V CC V BAT SQW INTA INTB/ (INTB) 1024Hz TD INT WD INT DS1286 only 100Hz 100Hz DS1286 only GND DQ0–DQ7 DS1284/DS1286 X1 X2 P N N V CC IBH |
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