DS1248 Datasheet, PDF (12/21 Pages) Dallas Semiconductor – 1024k NV SRAM with Phantom Clock

POWER-DOWN/POWER-UP TIMING
PARAMETER
SYMBOL
CE at V_IH before Power-Down
t_PD
V_CC Slew from V_PF(MAX) to
t_F
V_PF(MIN)( CE at V_IH)
V_CC Slew from V_PF(MAX) to
t_R
V_PF(MIN)( CE at V_IH)
CE at V_IH after Power-Up
t_REC
DS1248/DS1248P
Over the operating range (3.3V)
MIN TYP MAX UNITS NOTES
0
ms
300
ms
0
ms
1.5
2.5
ms
PARAMETER
Expected Data Retention Time
SYMBOL MIN TYP
t_DR
10
MAX
(T_A = +25°C)
UNITS NOTES
years
9
Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is
in battery-backup mode.
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