参数资料
型号: RTC-7301SFB
元件分类: 时钟/数据恢复及定时提取
英文描述: REAL TIME CLOCK, PDSO24
封装: SSOP-24
文件页数: 17/28页
文件大小: 274K
代理商: RTC-7301SFB
RTC - 7301 SF / DG
Page - 21
MQ332-05
8. Shifting to backup and recovering
VDD
VCLK
CS1
Backup
tCD
tF
tR
tCU
VIL
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
CS1 time before
power fall
tCD
-
0
s
Power fall time
tF
-
2
s / V
Power rise time
tR
-
1
s / V
CS1 time after
power rise
tCU
-
0
s
*When shifting to backup, the CS1 should be at Low level and RTC should be in a non-
selectable state before switching the power supply.
9. External connection example
RTC7301
VDD
GND
+
Voltage
Detector
4.7
F
0.1
F
Schottky
Barrier
Diode
Note
VDD
VO
VDD
CS1
/CS0
/ IRQ
A 3
/ RD
A 2
A 1
A 0
D 3
D 2
D 1
D 0
/WR
CPU / Controller
Address
Decoder
A 3
/ RD
A 2
A 1
A 0
D 3
D 2
D 1
D 0
/ WR
Upper
Address
VSS
FOUT
Note : Use a secondary battery or a lithium battery.
If using a secondary battery, a diode is unnecessary.
If using a lithium
battery, a diode is necessary.
Talk with your battery dealer regarding the details of the values of resistors.
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