參數(shù)資料
型號(hào)： DS17887-5
英文描述： Real-Time Clock
中文描述： 實(shí)時(shí)時(shí)鐘
文件頁數(shù)： 34/38頁
文件大小： 515K
代理商： DS17887-5
DS17885/DS17887
34 of 38
BURST MODE TIMING WAVEFORM
NOTES:
1.
All voltages are referenced to ground.
2.
Typical values are at 25°C and nominal supplies.
3.
Outputs are open.
4.
Write protection trip point occurs during power fail prior to switchover from V
CC
to V
BAT
.
5.
Applies to the AD0-AD7 pins, and the SQW pin when each is in a high impedance state.
6.
The IRQ and PWR pins are open drain.
7.
Measured with a load of 50 pF + 1 TTL gate.
8.
Wakeup kickstart timeout generated only when the oscillator is enabled and the countdown chain is
not reset.
9.
V
SW
is determined by the larger of V
BAT
and V
BAUX
.
10.
The DS17887 will keep time to an accuracy of ±1 minute per month during data retention time for
the period of t
DR
.
11.
t
DR
is the amount of time that the internal battery can power the internal oscillator and internal
registers of the DS17887.
12.
I
BAT1
and I
BAT2
are measured at V
BAT
= 3.5V.
13.
Real Time Clock 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°C. Post solder cleaning with water washing techniques is acceptable, provided that
ultrasonic vibration is not used.
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