DS12CR887 Maxim, DS12CR887 Datasheet - Page 7

• Manufacturer Part Number: DS12CR887
• Description: The DS12R885 is a functional drop-in replacement for the DS12885 real-time clock (RTC)
• Manufacturer: Maxim

DATA RETENTION (DS12CR887)
POWER-UP/POWER-DOWN CHARACTERISTICS
(T
CAPACITANCE
(T
AC TEST CONDITIONS
WARNING:
Note 1: Limits at -40°C are guaranteed by design and not production tested.
Note 2: All voltages are referenced to ground.
Note 3: All outputs are open.
Note 4: Specified with CS = DS = R/W = RESET = V
Note 5: Applies to the AD0 to AD7 pins, the IRQ pin, and the SQW pin when each is in a high-impedance state.
Note 6: The MOT pin has an internal 20kΩ pulldown.
Note 7: Measured with a 32.768kHz crystal attached to X1 and X2.
Note 8: Measured with a 50pF capacitance load.
Note 9: Guaranteed by design. Not production tested.
Expected Data Retention
Capacitance on All Input Pins
Except X1 and X2
Capacitance on IRQ, SQW, and
DQ Pins
Recovery at Power-Up
V
V
V
V
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
A
A
CC
PF(MIN)
CC
PF(MAX)
= -40°C to +85°C) (Note 1)
= +25°C)
Fall Time; V
Rise Time; V
RTCs with Constant-Voltage Trickle Charger
PARAMETER
PARAMETER
PARAMETER
PF(MAX)
Negative undershoots below -0.3V while the part is in battery-backed mode may cause loss of data.
PF(MIN)
to
to
PARAMETER
SYMBOL
SYMBOL
SYMBOL
t
C
C
t
RPU
DR
t
t
IO
F
R
IN
_____________________________________________________________________
T
(Note 9)
(Note 9)
A
= +25°C
CC
; MOT, AS, AD0–AD7 = 0; V
CONDITIONS
CONDITIONS
CONDITIONS
0 to 3.0V
0 to 2.7V
50pF + 1TTL Gate
25pF + 1TTL Gate
Input/Output: V
5ns
IL
maximum and V
BACKUP
TEST CONDITIONS
open.
MIN
MIN
MIN
300
20
5
0
IH
minimum
TYP
TYP
TYP
MAX
MAX
MAX
200
10
10
UNITS
UNITS
UNITS
Years
pF
pF
ms
µs
µs
7