DS17485 Dallas, DS17485 Datasheet - Page 34

• Manufacturer Part Number: DS17485
• Description: (DS17486 / DS17487) 3V/5V Real-Time Clock
• Manufacturer: Dallas

BURST MODE TIMING WAVEFORM
NOTES:
1) Typical values are at +25°C and nominal supplies.
2) Outputs are open.
3) Write-protection trip point occurs during power-fail prior to switchover from V
4) Applies to the AD0 to AD7 pins, and the SQW pin when each is in a high-impedance state.
5) The IRQ and PWR pins are open-drain.
6) Measured with a load of 50pF + 1 TTL gate.
7) Wake-up kickstart timeout generated only when the oscillator is enabled and the countdown chain is
8) V
9) The DS17487 keeps time to an accuracy of ±1 minute per month during data retention time for the
10) t
11) I
12) RTC modules can be successfully processed through conventional wave-soldering techniques as long
not reset.
period of t
registers of the DS17487.
as temperature exposure to the lithium energy source contained within does not exceed +85°C. Post-
solder cleaning with water-washing techniques is acceptable, provided that ultrasonic vibration is not
used.
DR
BAT1
SW
is the amount of time that the internal battery can power the internal oscillator and internal
is determined by the larger of V
and I
DR
BAT2
.
are measured at V
BAT
BAT
= 3.5V.
and V
BAUX
34 of 38
.
CC
to V
BAT
.