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| DS1685_10 Datasheet, PDF (29/34 Pages) Maxim Integrated Products – 3V/5V Real-Time Clocks | |||
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POWER-UP/DOWN TIMINGâ5V
(TA = +25°C)
PARAMETER
SYMBOL
MIN
CS High to Power-Fail
tPF
Recovery at Power-Up
tREC
VCC Slew Rate Power-Down
tF
4.0 ï£ VCC ï£ 4.5V
300
VCC Slew Rate Power-Down
tFB
3.0 ï£ VCC ï£ 4.0V
10
VCC Slew Rate Power-Up
tR
4.5V ï³ VCC ï³ 4.0V
0
Expected Data Retention
tDR
10
DS1685/DS1687 3V/5V Real-Time Clocks
TYP MAX UNITS NOTES
0
ns
150
ms
ïs
ïs
ïs
years
9, 10
POWER-UP/DOWN TIMINGâ3V
(TA = +25°C)
PARAMETER
SYMBOL
MIN
CS High to Power-Fail
tPF
Recovery at Power-Up
tREC
VCC Slew Rate Power-Down
tF
2.5 ï£ VCC ï£ 2.7V
300
VCC Slew Rate Power-Up
tR
2.7V ï³ VCC ï³ 2.5V
0
Expected Data Retention
tDR
10
TYP MAX UNITS NOTES
0
ns
150
ms
ïs
ïs
years
9, 10
WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed
when device is in battery-backup mode.
CAPACITANCE
(TA = +25°C)
PARAMETER
Input Capacitance on All Inputs
Except X1 and X2
Output Capacitance on IRQ,
SQW and DQ pins
SYMBOL
CIN
COUT
MIN
TYP
MAX
UNITS NOTES
12
pF
12
pF
WAKE-UP/KICKSTART TIMING
(TA = +25°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS NOTES
Kickstart Input Pulse Width
tKSPW
2
ïs
Wake-Up/Kickstart Power On
Timeout
tPOTO
2
seconds
7
29 of 34
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