DS1685 Maxim, DS1685 Datasheet - Page 32

• Manufacturer Part Number: DS1685
• Description: The DS1685/DS1687 are real-time clocks (RTCs) designed as successors to the industry-standard DS1285,DS1385, DS1485, and DS1585 PC RTCs
• Manufacturer: Maxim

WAKE-UP/KICKSTART TIMING
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10: t
Note 11: RTC Encapsulate DIP modules can be successfully processed through conventional wave-soldering techniques as
Note 12: I
All voltages are referenced to ground.
Typical values are at +25°C and nominal supplies.
Outputs are open.
Applies to the AD0–AD7 pins and the SQW pin when each is in a high-impedance state.
The IRQ and PWR pins are open-drain outputs.
Measured with a load of 50pF + 1 TTL gate.
Wake-up kickstart timeout generated only when the oscillator is enabled and the countdown chain is not reset.
V
The DS1687 keeps time to an accuracy of ±1 minute per month at 25°C during data retention time for the period of t
at 25°C.
long as temperature exposure to the lithium energy source contained within does not exceed +85°C. Post solder
cleaning with water washing techniques is acceptable, if ultrasonic vibration is not used.
DR
BAT1
SW
is the amount of time that the internal battery can power the internal oscillator and internal registers of the DS1687
is determined by the larger of V
and I
BAT2
*THIS CONDITION CAN OCCUR WITH THE 3V DEVICE.
NOTE: TIME INTERVALS SHOWN ABOVE ARE REFERENCED IN WAKE-UP/KICKSTART SECTION.
are measured at V
BAT
BAT
or V
and V
BAUX
BAUX
= 3.5V and with recommended crystal type on X1 and X2.
32 of 34
.
DS1685/DS1687 3V/5V Real-Time Clocks
DR
.