Datasheet

I
2
C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
Maxim Integrated 5
DS1388
POWER-UP/POWER-DOWN CHARACTERISTICS
(T
A
= -40°C to +85°C) (Note 2) (Figures 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
Detect to Recognize Inputs
(V
CC
Rising)
t
RST
(Note 18) 160 180 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
Figure 1. Power-Up/Down Timing
t
RST
PB
DB
RST
Figure 2. Pushbutton Reset Timing