DS1689 Datasheet, PDF (28/32 Pages) Dallas Semiconductor – 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control

POWER-UP POWER-DOWN TIMING 5-VOLT OPERATION
PARAMETER
SYMBOL
MIN TYP MAX
CS High to Power-Fail
t_PF
0
Recovery at Power-up
t_REC
150
V_CC Slew Rate Power-down
t_F
300
4.0 £ V_CC £ 4.5V
V_CC Slew Rate Power-down
t_FB
10
3.0 £ V_CC £ 4.0V
V_CC Slew Rate Power-up
t_R
0
4.5V ³ V_CC ³ 4.0V
Expected Data Retention
t_DR
10
DS1689/DS1693
(t_A = 25°C)
UNITS NOTES
ns
ms
ms
ms
ms
years 13, 14
POWER-UP POWER-DOWN TIMING 3-VOLT OPERATION
PARAMETER
SYMBOL
MIN TYP MAX
CS High to Power-Fail
t_PF
0
Recovery at Power-up
t_REC
150
V_CC Slew Rate Power-down
t_F
300
2.5 £ V_CC £ 3.0V
V_CC Slew Rate Power-up
t_R
0
3.0V ³ V_CC ³ 2.5V
Expected Data Retention
t_DR
10
(t_A = 25°C)
UNITS NOTES
ns
ms
ms
ms
years 13, 14
WARNING:
Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery
back-up mode.
CAPACITANCE
PARAMETER
Input Capacitance
Output Capacitance
SYMBOL
C_IN
C_OUT
MIN
TYP
MAX
12
12
(t_A = 25°C)
UNITS NOTES
pF
pF
WAKE-UP/KICKSTART TIMING
PARAMETER
SYMBOL MIN TYP
Kickstart Input Pulse Width
t_KSPW
2
Wake-up/Kickstart Power-on Timeout
t_POTO
2
MAX
(t_A = 25°C)
UNITS NOTES
ms
seconds 10
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