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74LS47

更新时间： 2024-01-22 13:06:06
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 解码器驱动器
页数 文件大小 规格书
6页 70K
描述
BCD to 7-Segment Decoder/Driver with Open-Collector Outputs

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中文翻译

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74LS47 技术参数

生命周期：Contact Manufacturer包装说明：,
Reach Compliance Code：unknown风险等级：5.77
Base Number Matches：1

74LS47 数据手册

 浏览型号74LS47的Datasheet PDF文件第1页浏览型号74LS47的Datasheet PDF文件第3页浏览型号74LS47的Datasheet PDF文件第4页浏览型号74LS47的Datasheet PDF文件第5页浏览型号74LS47的Datasheet PDF文件第6页 
Truth Table  
Decimal  
or  
Inputs  
Outputs  
Note  
Function  
LT  
H
RBI  
H
A3  
L
A2  
L
A1  
L
A0 BI/RBO  
a
L
H
L
L
b
L
L
L
L
c
L
L
H
L
d
L
e
L
f
g
H
H
L
0
1
2
3
L
H
L
H
H
H
H
L
(Note 2)  
(Note 2)  
H
X
L
L
L
H
L
H
L
H
H
H
H
X
L
L
H
H
H
X
L
L
H
L
H
L
4
5
6
7
8
H
H
H
H
H
X
X
X
X
X
L
L
L
L
H
H
H
H
H
L
L
L
L
H
L
H
H
H
H
H
H
L
L
H
H
L
L
L
L
L
L
H
L
H
H
L
L
L
L
H
L
L
L
L
H
L
H
H
L
H
L
L
H
L
H
L
H
L
L
L
9
H
H
H
H
H
X
X
X
X
X
H
H
H
H
H
L
L
L
H
H
L
H
L
H
H
H
H
H
L
H
H
H
L
L
H
H
L
L
H
L
H
L
H
L
L
H
H
L
L
L
L
L
L
10  
11  
12  
13  
L
H
L
L
H
H
H
H
H
H
H
H
L
L
H
H
L
14  
15  
H
H
X
H
L
X
X
X
L
H
H
X
L
H
H
X
L
H
H
X
L
L
H
X
L
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
L
H
H
H
L
L
H
H
H
L
L
H
H
H
L
L
H
H
H
L
BI  
(Note 3)  
(Note 4)  
(Note 5)  
RBI  
LT  
L
X
X
X
X
X
H
Note 2: BI/RBO is wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO). The blanking out (BI) must be open or held at a HIGH  
level when output functions 0 through 15 are desired, and ripple-blanking input (RBI) must be open or at a HIGH level if blanking or a decimal 0 is not  
desired. X = input may be HIGH or LOW.  
Note 3: When a LOW level is applied to the blanking input (forced condition) all segment outputs go to a HIGH level regardless of the state of any other input  
condition.  
Note 4: When ripple-blanking input (RBI) and inputs A0, A1, A2 and A3 are LOW level, with the lamp test input at HIGH level, all segment outputs go to a  
HIGH level and the ripple-blanking output (RBO) goes to a LOW level (response condition).  
Note 5: When the blanking input/ripple-blanking output (BI/RBO) is OPEN or held at a HIGH level, and a LOW level is applied to lamp test input, all segment  
outputs go to a LOW level.  
Functional Description  
The DM74LS47 decodes the input data in the pattern indi-  
cated in the Truth Table and the segment identification  
illustration. If the input data is decimal zero, a LOW signal  
applied to the RBI blanks the display and causes a multi-  
digit display. For example, by grounding the RBI of the  
highest order decoder and connecting its BI/RBO to RBI of  
the next lowest order decoder, etc., leading zeros will be  
suppressed. Similarly, by grounding RBI of the lowest order  
decoder and connecting its BI/RBO to RBI of the next high-  
est order decoder, etc., trailing zeros will be suppressed.  
Leading and trailing zeros can be suppressed simulta-  
neously by using external gates, i.e.: by driving RBI of a  
intermediate decoder from an OR gate whose inputs are  
BI/RBO of the next highest and lowest order decoders. BI/  
RBO also serves as an unconditional blanking input. The  
internal NAND gate that generates the RBO signal has a  
resistive pull-up, as opposed to a totem pole, and thus BI/  
RBO can be forced LOW by external means, using wired-  
collector logic. A LOW signal thus applied to BI/RBO turns  
off all segment outputs. This blanking feature can be used  
to control display intensity by varying the duty cycle of the  
blanking signal. A LOW signal applied to LT turns on all  
segment outputs, provided that BI/RBO is not forced LOW.  
www.fairchildsemi.com  
2
123456

中文翻译

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