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RTC72421B PDF预览

RTC72421B

更新时间： 2024-11-12 23:33:19
品牌 Logo 应用领域
其他 - ETC 时钟
页数 文件大小 规格书
2页 74K
描述
4-bit REAL TIME CLOCK MODULE(71.62 k)

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中文翻译

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RTC72421B 数据手册

 浏览型号RTC72421B的Datasheet PDF文件第2页 
Real time clock module  
4-bit REAL TIME CLOCK MODULE  
RTC-72421/72423  
•
•
•
•
•
•
Builtin crystal unit allows adjustment-free efficient operation.  
ALE input terminal available for 8048, 8051, and 8085 series.  
12/24H clock switchover function and automatic leap year setting.  
Interrupt masking.  
30 second adjustment function.  
Low current consumption and features a backup function.  
Actual size  
Specifications (characteristics)  
Absolute Max. rating  
Terminal connection  
RTC-72421  
Specifications  
-0.3 to 7.0  
Unit  
V
Symbol  
VDD  
Condition  
Ta=25˚C  
Item  
Power source voltage  
Input and output voltage  
No.  
1
2
72421  
STD. P  
CS  
No.  
1
2
72423  
STD. P  
CS0  
18 17 16 15 14 13 12 11 10  
0
GND -0.3 to VDD+0.3  
-55 to +85  
-55 to +125  
VI/O  
Ta=25˚C  
ALE  
3
3
NC  
A0  
4
4
ALE  
RTC-72421  
RTC-72423  
A1  
5
5
A0  
˚C  
TSTG  
TSOL  
Storage temperature  
Soldering condition  
A2  
6
6
NC  
A3  
Under 260˚C within 10 sec.  
(lead part) (package should  
be less than 150˚C)  
7
7
A1  
RD  
GND  
WR  
D3  
D2  
8
9
8
9
NC  
A2  
A3  
RD  
GND  
WR  
D3  
D2  
D1  
NC  
NC  
RTC-72421  
RTC-72423  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
Twice at under 260˚C within  
10 sec. or under 230˚C  
within 3 min.  
RTC-72423  
D1  
D0  
Operating range  
24 23 22 21 20 19 18 17 16 15 14 13  
CS  
1
Unit  
V
(
)
Item  
Symbol  
Specifications  
4.5 to 5.5  
-10 to 70  
VDD  
Condition  
(
)
VDD  
VDD  
Operating voltage  
VDD  
TOPR  
VDH  
D0  
RTC-72421  
RTC-72423  
˚C  
V
Operating temperature  
CS  
1
-40 to 85  
NC  
VDD  
VDD  
VDD  
(
(
)
)
Data holding voltage  
CSI data holding time  
Operation restoring time  
2.0 to 5.5  
tCDR  
tR  
1
2 3 4 5 6 7 8 9 10 11 12  
Refer to the data  
holding timing  
µs  
2.0 min.  
(VDD) and VDD are to have the same level of voltage. Do not connect it to any external terminals.  
NC is not connected internally.  
Frequency characteristics and current consumption  
characteristics  
(Unit: mm)  
External dimensions  
Symbol  
Condition  
Specifications Unit  
Item  
RTC-72421  
±10  
±50  
72421 A  
23.1 max.  
Ta=25˚C  
VDD=5V  
72421 B  
72423 A  
72423  
∆f/fo  
Frequency tolerance  
±20  
ppm  
RTC72421 A  
EPSON 5053C  
±50  
Frequency temperature  
characteristics  
-10 to +70˚C  
7.62  
+10/-120  
(25˚C reference temperature)  
VDD=5V, Ta=25˚C,  
first year  
ppm/Y  
fa  
±5 max.  
Aging  
0.25  
Three drops on a  
hard board from 75 cm  
or 3000G x 0.3ms x  
1/2 sine wave x 3 directions  
90° to  
105°  
ppm  
Shock resistance  
S.R.  
±10 max.  
CS1=0V VDD=5V  
IDD1  
10 max.  
5 max.  
µA  
Exclude input/  
Current consumption  
VDD=2V  
IDD2  
output current  
Electrical characteristics  
RTC-72423  
Applicable  
terminal  
Item  
Symbol Condition Min. Typ. Max. Unit  
16.3 max.  
All inputs  
other than  
“H” input voltage (1)  
“L” input voltage (1)  
Input leak current (1)  
Input leak current (2)  
“L” output voltage (1)  
“H” output voltage  
“L” output voltage (2)  
Off leak current  
VIH1  
VIL1  
ILK1  
2.2  
—
0.8  
±1  
—
V
CS  
1
Input other  
than D0 to D3  
V1=VDD/0V  
µA  
—
2.4  
—
ILK2  
±10  
0.4  
—
—
RTC72423 A  
EPSON 6150  
D0 to D3  
STD.P  
IOL=2.5mA  
IOH=-400µA  
IOL=2.5mA  
VOL1  
VOH  
VOL2  
V
0.4  
10  
IOFFLK V1=VDD/0V  
µA  
pF  
Input other  
than D0 to D3  
10  
20  
Input  
frequency 1 MHz  
0° to  
10°  
Input capacity  
C1  
0.05 min.  
1.0  
D0 to D3  
CS1  
—
2.8 max.  
“H” input voltage (2)  
“L” input voltage (2)  
4/5 VDD  
—
VIH2  
V
DD=2 to 5.5V  
—
V
1/5 VDD  
VIL2  
65  
12

中文翻译

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