Datasheet

(T
A
= -40°C to +85°C) (Figures 5, 6)
Figure 5. Power-Up/Down Timing
Figure 6. Pushbutton Reset Timing
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
Detect to Recognize Inputs
(V
CC
Rising)
t
RST
(Note 17) 160 200 ms
V
CC
Fall Time; V
PF(MAX)
to
V
PF(MIN)
t
F
300 µs
V
CC
Rise Time; V
PF(MIN)
to
V
PF(MAX)
t
R
0 µs
OUTPUTS
V
CC
V
PF(MAX)
INPUTS
HIGH IMPEDANCE
RST
DON'T CARE
VALID
RECOGNIZED
RECOGNIZED
VALID
V
PF(MIN)
t
RST
t
RPU
t
R
t
F
V
PF
V
PF
t
RST
PB
DB
RST
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Maxim Integrated │ 8
DS1390–DS1394 Low-Voltage SPI/3-Wire RTCs
with Trickle Charger
Power-Up/Power-Down Characteristics