DS1554 Datasheet, PDF (16/21 Pages) Dallas Semiconductor – 256K NV Y2KC Timekeeping RAM

POWER-UP/DOWN CHARACTERISTICS
PARAMETER
SYMBOL MIN
CE or WE at V_IH , Before
Power-Down
V_CC Fall Time: V_PF(MAX) to
V_PF(Min)
V_CC Rise Time: V_PF(MIN) to
V_PF(MAX)
V_PF to RST High
Expected Data Retention Time
(Oscillator On)
t_PD
0
t_F
300
t_R
0
t_REC
40
t_DR
10
DS1554
(0°C to 70°C; V_CC = 3.3V ±10%)
TYP MAX UNITS NOTES
µs
µs
µs
200
ms
years
6, 7
POWER-UP/DOWN WAVEFORM TIMING 3.3-VOLT DEVICE Figure 9
CAPACITANCE
PARAMETER
Capacitance on all input pins
Capacitance on IRQ /FT, RST ,
and DQ pins
SYMBOL MIN
C_IN
C_IO
TYP
MAX
7
10
(T_A = 25°C)
UNITS NOTES
pF
1
pF
1
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