DS1558 Datasheet, PDF (18/18 Pages) Dallas Semiconductor – Watchdog Clock with NV RAM Control

AC TEST CONDITIONS
Output Load: 25pF
Input Pulse Levels: 0 to +3V
Timing Measurement Reference Levels:
Input: +1.5V
Output: +1.5V
Input Pulse Rise and Fall Times: 5ns
DS1558
NOTES:
1) Voltage referenced to ground.
2) Typical values are at +25°C and nominal supplies.
3) Outputs are open.
4) Battery switchover occurs at the lower of either the battery voltage or V_PF.
5) The IRQ /FT and RST outputs are open drain.
6) Using the recommended crystal on X1 and X2.
7) V_CCO, CER , and OER pins open.
8) t_AH1, t_DH1 are measured from WE going high.
9) t_AH2, t_DH2 are measured from CE going high.
10) Typical measured with V_BAT at 3.0V. Typical with I_CCO = 100µA and V_BAT = 3.0V is V_BAT - 0.322.
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