DS17285 Datasheet, PDF (30/38 Pages) Dallas Semiconductor – 3V/5V Real-Time Clock

POWER-UP/POWER-DOWN TIMING, 5V
PARAMETER
SYMBOL
MIN
CS High to Power-Fail
t_PF
Recovery at Power-Up
t_REC
V_CC Slew Rate Power-Down
t_F
4.0 £ V_CC £ 4.5V
300
V_CC Slew Rate Power-Down
t_FB
3.0 £ V_CC £ 4.0V
10
V_CC Slew Rate Power-Up
t_R
4.5 ³ V_CC ³ 4.0V
0
Expected Data Retention
t_DR
10
TYP
150
MAX
0
DS17285/DS17287
(T_A = +25°C)
UNITS NOTES
ns
ms
ms
ms
ms
years
9, 10
POWER-UP/POWER-DOWN TIMING, 3V
PARAMETER
SYMBOL
MIN
CS High to Power-Fail
t_PF
Recovery at Power-Up
t_REC
V_CC Slew Rate Power-Down
t_F
2.5 £ V_CC £ 3.0V
300
V_CC Slew Rate Power-Up
t_R
3.0 ³ V_CC ³ 2.5V
0
Expected Data Retention
t_DR
10
TYP
150
MAX
0
(T_A = +25°C)
UNITS NOTES
ns
ms
ms
ms
years
9, 10
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
(T_A = +25°C)
TYP MAX UNITS NOTES
12
pF
12
pF
WAKE-UP/KICKSTART TIMING
PARAMETER
SYMBOL
Kickstart-Input Pulse-Width
Wake-up/Kickstart Power-On
Timeout
t_KSPW
t_POTO
MIN
2
2
(T_A = +25°C)
TYP MAX UNITS NOTES
ms
s
7
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