DS12CR885 Datasheet, PDF (7/22 Pages) Maxim Integrated Products – RTC with Constant-Voltage Trickle Charger

RTC with Constant-Voltage Trickle Charger
POWER-UP/POWER-DOWN CHARACTERISTICS
(T_A = -40°C to +85°C) (Note 1)
PARAMETER
Recovery at Power-Up
V_CC Fall Time; V_PF(MAX) to
V_PF(MIN)
SYMBOL
t_RPU
t_F
CONDITIONS
V_CC Rise Time; V_PF(MIN) to
V_PF(MAX)
t_R
CAPACITANCE
(T_A = +25°C)
PARAMETER
Capacitance on All Input Pins
Except X1 and X2
Capacitance on IRQ, SQW, and
DQ Pins
SYMBOL
C_IN
(Note 9)
C_IO
(Note 9)
CONDITIONS
MIN TYP MAX UNITS
20
200
ms
300
µs
0
µs
MIN TYP MAX UNITS
10
pF
10
pF
AC TEST CONDITIONS
PARAMETER
Input Pulse Levels (-5)
Input Pulse Levels (-33)
Output Load Including Scope and Jig (-5)
Output Load Including Scope and Jig (-33)
Input and Output Timing Measurement Reference Levels
Input-Pulse Rise and Fall Times
TEST CONDITIONS
0 to 3.0V
0 to 2.7V
50pF + 1TTL Gate
25pF + 1TTL Gate
Input/Output: V_IL maximum and V_IH minimum
5ns
WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode may cause loss of data.
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Limits at -40°C are guaranteed by design and not production tested.
All voltages are referenced to ground.
All outputs are open.
Specified with CS = DS = R/W = RESET = V_CC; MOT, AS, AD0–AD7 = 0; V_BACKUP open.
Applies to the AD0 to AD7 pins, the IRQ pin, and the SQW pin when each is in a high-impedance state.
The MOT pin has an internal 20kΩ pulldown.
Measured with a 32.768kHz crystal attached to X1 and X2.
Measured with a 50pF capacitance load.
Guaranteed by design. Not production tested.
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