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DS1390 Datasheet, PDF (7/24 Pages) Maxim Integrated Products – Low-Voltage SPI/3-Wire RTCs with Trickle Charger
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Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
POWER-UP/POWER-DOWN CHARACTERISTICS
(TA = -40°C to +85°C) (Figures 5, 6)
PARAMETER
SYMBOL
CONDITIONS
VCC Detect to Recognize Inputs
(VCC Rising)
VCC Fall Time; VPF(MAX) to
VPF(MIN)
tRST (Note 17)
tF
VCC Rise Time; VPF(MIN) to
VPF(MAX)
tR
MIN TYP MAX UNITS
160
200
ms
300
µs
0
µs
VCC
VPF(MAX)
VPF(MIN)
VPF
tF
RST
INPUTS
RECOGNIZED
OUTPUTS
VALID
Figure 5. Power-Up/Down Timing
RST
PBDB
tRST
Figure 6. Pushbutton Reset Timing
VPF
tR
tRPU
tRST
DON'T CARE
HIGH-IMPEDANCE
RECOGNIZED
VALID
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