Power-up/power-down characteristics (v, 5v ± 10%) – Rainbow Electronics DS1254 User Manual
Page 12
DS1254
12 of 17
Figure 9. POWER-UP/POWER-DOWN WAVEFORM TIMING (Note 14)
V
CC
V
PF(max)
V
PF(min)
t
F
t
FB
t
PD
t
DR
V
BAT
t
REC
t
BPU
Slews with V
CC
BW
t
R
Slews with V
CC
CE
WE
,
POWER-UP/POWER-DOWN CHARACTERISTICS
(V
CC
= 5V
±
10%)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
CE
and
WE
at V
IH
Before Power Down
t
PD
0
µ
S
V
CC
Fall Time: V
PF(max)
to V
PF(min)
t
F
300
µ
S
V
CC
Fall Time: V
PF(min)
to V
BAT
t
FB
10
µ
S
V
CC
Rise Time: 0V to V
PF(min)
t
R
150
µ
S
V
CC
Valid to End of Write Protection
t
REC
125
mS
V
CC
Valid to
BW
Valid
t
BPU
1
Sec
3
(T
A
= +25
°
C )
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Expected Data Retention Time
(Oscillator On)
t
DR
10
years
4
Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is
in battery-backup mode.