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DS1236AS-5 Datasheet, PDF (19/19 Pages) Maxim Integrated Products – MicroManager Chip
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CAPACITANCE
PARAMETER
Input Capacitance
Output Capacitance
SYMBOL
CIN
COUT
MIN
TYP
MAX
5
7
DS1236
(tA=25°C)
UNITS NOTES
pF
pF
NOTES:
1. All voltages referenced to ground. A 0.1 μF capacitor is recommended between VCC and GND.
2. Measured with VCCO, CEO , PF, ST , PBRST , RST, RST , and NMI pin open. IBAT specified at 25°C.
3. ICCO1 is the maximum average load which the DS1236 can supply at VCC-0.3V through the VCCO pin
during normal 5-volt operation.
4. ICCO2 is the maximum average load which the DS1236 can supply through the VCCO pin during data
retention battery supply operation, with a maximum drop of 0.8 volts.
5. With tR = 5 μs.
6. VCCO is approximately VBAT-0.5V at 1 μA load.
7. Sleep mode is not invoked.
8. Sleep mode is invoked.
9. tREC is the minimum time required before CEI / CEO memory access is allowed.
10. tCE maximum must be met to ensure data integrity on power loss.
11. IN input is less than VTP but VCC greater than VCCTP.
12. All outputs except RST which is 25 μA minimum.
13. All outputs except RST and NMI which is 25 μA maximum.
14. Pulse width of NMI requires that the IN pin remain below VTP. If the IN pin returns to a level above
VTP for a period longer than tIPD and before the tNMI period has elapsed, the NMI pin will immediately
return to a high.
15. IN pin greater than VTP when VCC supply rises to VBAT. Example: IN tied to GND.
16. IN pin less than VTP when VCC supply rises to VBAT.
17. CEI low.
18. The WC/ SC pin contains an internal latch which drives back on to the pin. This latch requires ±200
μamps to switch states. The ST pin will sink ±50 μamps in normal operation and ±1 μamp in the
sleep mode.
19. ST should be active low before the watchdog is disabled (i.e., before the ST input is tristated).
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