DS1642 Datasheet, PDF (10/13 Pages) Dallas Semiconductor – Nonvolatile Timekeeping RAM

DS1642
POWER-UP/POWER-DOWN AC CHARACTERISTICS
(T_A = 0°C to +70°C)
PARAMETER
SYMBOL MIN TYP
CE or WE at V_IH Before Power-Down
t_PD
0
V_CC Fall Time: V_PF (MAX) to V_PF (MIN)
t_F
300
V_CC Fall Time: V_PF (MIN) to V_BAT
t_FB
10
V_CC Rise Time: V_PF (MIN) to V_PF (MAX)
t_R
0
Power-up Recover Time
t_REC
Expected Data Retention Time
(Oscillator On)
t_DR
10
MAX
35
UNITS
s
s
s
s
ms
years
NOTES
4, 5
POWER-UP/POWER-DOWN WAVEFORM TIMING
CAPACITANCE
(T_A = +25°C)
PARAMETER
Capacitance on All Pins (except DQ)
Capacitance on DQ Pins
SYMBOL
C_IN
C_O
MIN
TYP
MAX
7
10
UNITS
pF
pF
NOTES
10 of 13