DS1556 Datasheet, PDF (14/20 Pages) Dallas Semiconductor – 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM

DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
POWER-UP/DOWN CHARACTERISTICS—5V
(V_CC = 5.0V ±10%, Over the Operating Range.)
PARAMETER
CE or WE at V_IH, Before
Power-Down
SYMBOL
t_PD
CONDITIONS
V_CC Fall Time: V_PF(MAX) to V_PF(MIN)
V_CC Fall Time: V_PF(MIN) to V_SO
V_CC Rise Time: V_PF(MIN) to V_PF(MAX)
V_PF to RST High
Expected Data-Retention Time
(Oscillator On)
t_F
t_FB
t_R
t_REC
t_DR
(Notes 6, 7)
MIN TYP MAX UNITS
0
ms
300
ms
10
ms
0
ms
40
200
ms
10
years
Figure 8. Power-Up/Down Waveform Timing (5V Device)
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