Rainbow Electronics DS1393 - Manual (Page 7)

DS1390/DS1391/DS1392/DS1393
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
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OUTPUTS
V
CC
V
PF(MAX)
INPUTS
HIGH-IMPEDANCE
RST
DON'T CARE
VALID
RECOGNIZED RECOGNIZED
VALID
V
PF(MIN)
tRST
tRPU
tR tF
V PF V PF
Figure 5. Power-Up/Down Timing
t RST PB DB
RST
Figure 6. Pushbutton Reset Timing
POWER-UP/POWER-DOWN CHARACTERISTICS
(T A = -40°C to +85°C) (Figures 5, 6)
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