DS1685-5 Datasheet

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DS1685/DS1687 3V/5V Real-Time Clocks

WAKE-UP/KICKSTART TIMING

*THIS CONDITION CAN OCCUR WITH THE 3V DEVICE.

NOTE:

TIME INTERVALS SHOWN ABOVE ARE REFERENCED IN

WAKE-UP/KICKSTART

SECTION.

Note 1:

Note 2:

Note 3:

Note 4:

Note 5:

Note 6:

Note 7:

Note 8:

Note 9:

All voltages are referenced to ground.

Typical values are at +25掳C and nominal supplies.

Outputs are open.

Applies to the AD0鈥揂D7 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

SW

is determined by the larger of V

BAT

and V

BAUX

.

The DS1687 keeps time to an accuracy of 卤1 minute per month at 25掳C during data retention time for the period of t

DR

.

Note 10:

t

DR

is the amount of time that the internal battery can power the internal oscillator and internal registers of the DS1687

at 25掳C.

Note 11:

RTC Encapsulate DIP modules can be successfully processed through conventional wave-soldering techniques as

long as temperature exposure to the lithium energy source contained within does not exceed +85掳C. Post-solder

cleaning with water-washing techniques is acceptable, if ultrasonic vibration is not used.

Note 12:

I

BAT1

and I

BAT2

are measured at V

BAT

or V

BAUX

= 3.5V and with recommended crystal type on X1 and X2.

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