DS1642 Datasheet, PDF (9/11 Pages) Dallas Semiconductor – Nonvolatile Timekeeping RAM

POWER-UP/DOWN AC CHARACTERISTICS
PARAMETER
SYMBOL MIN
CE or WE at V_IH
Before Power-down
t_PD
0
V_CC Fall Time: V _PF (MAX) to
V_PF (Min)
V_CC Fall Time: V _PF (MIN) to V_BAT
V_CC Rise Time: V _PF (MIN) to
V_PF (MAX)
Power-up Recover Time
t_F
300
t_FB
10
t_R
0
t_REC
Expected Data Retention Time
t_DR
10
(Oscillator On)
TYP
MAX
35
DS1642
(0°C to 70°C)
UNITS NOTES
µs
µs
µs
µs
ms
years
4, 5
POWER-UP/DOWN WAVEFORM TIMING
CAPACITANCE
PARAMETER
Capacitance on all pins (except DQ)
Capacitance on DQ pins
SYMBOL
C_IN
C_O
MIN
TYP
MAX
7
10
(t_A = 25°C)
UNITS NOTES
pF
pF
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