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SN54/74LS249 PDF预览

SN54/74LS249

更新时间： 2022-04-23 23:00:11
品牌 Logo 应用领域
摩托罗拉 - MOTOROLA 驱动器
页数 文件大小 规格书
8页 283K
描述
BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS

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SN54/74LS249 数据手册

 浏览型号SN54/74LS249的Datasheet PDF文件第1页浏览型号SN54/74LS249的Datasheet PDF文件第2页浏览型号SN54/74LS249的Datasheet PDF文件第4页浏览型号SN54/74LS249的Datasheet PDF文件第5页浏览型号SN54/74LS249的Datasheet PDF文件第6页浏览型号SN54/74LS249的Datasheet PDF文件第7页 
SN54/74LS247 • SN54/74LS248 • SN54/74LS249  
LS247  
FUNCTION TABLE  
DECIMAL  
OR  
FUNCTION  
INPUTS  
OUTPUTS  
d
BI/RBO  
NOTE  
LT  
RBI  
D
C
B
A
a
b
c
e
f
g
0
1
2
3
H
H
H
H
H
X
X
X
L
L
L
L
L
L
L
L
L
L
H
H
L
H
L
H
H
H
H
ON  
OFF  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
OFF  
ON  
ON  
OFF  
ON  
ON  
ON  
OFF  
OFF OFF OFF  
ON  
OFF OFF  
OFF  
ON  
ON  
H
ON  
ON  
4
5
6
7
H
H
H
H
X
X
X
X
L
L
L
L
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
OFF  
ON  
ON  
ON  
ON  
OFF  
OFF  
ON  
ON  
ON  
ON  
ON  
OFF  
ON  
ON  
OFF  
OFF  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
H
OFF  
OFF OFF OFF  
1
8
9
10  
11  
H
H
H
H
X
X
X
X
H
H
H
H
L
L
L
L
L
L
H
H
L
H
L
H
H
H
H
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
OFF  
ON  
ON  
ON  
OFF  
ON  
ON  
ON  
ON  
OFF OFF OFF  
OFF OFF ON  
H
OFF OFF  
12  
13  
14  
15  
H
H
H
H
X
X
X
X
H
H
H
H
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
OFF  
ON  
ON  
OFF OFF  
OFF OFF  
OFF  
OFF  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
OFF OFF OFF  
OFF OFF OFF OFF  
H
OFF OFF OFF  
BI  
RBI  
LT  
X
H
L
X
L
X
X
L
X
X
L
X
X
L
X
X
L
X
L
L
H
OFF OFF OFF OFF  
OFF OFF OFF OFF  
OFF OFF OFF  
OFF OFF OFF  
2
3
4
ON  
ON  
ON  
ON  
ON  
ON  
ON  
LS248, LS249  
FUNCTION TABLE  
DECIMAL  
OR  
FUNCTION  
INPUTS  
OUTPUTS  
d
BI/RBO  
a
NOTE  
LT  
RBI  
D
C
B
A
b
c
e
f
g
0
1
2
3
H
H
H
H
H
X
X
X
L
L
L
L
L
L
L
L
L
L
H
H
L
H
L
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
L
H
H
H
L
H
L
H
L
L
L
L
L
H
H
1
1
H
H
4
5
6
7
H
H
H
H
X
X
X
X
L
L
L
L
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
L
H
H
H
H
L
L
H
H
H
H
L
H
H
L
L
L
H
L
H
H
H
L
H
H
H
L
H
H
1
8
9
10  
11  
H
H
H
H
X
X
X
X
H
H
H
H
L
L
L
L
L
L
H
H
L
H
L
H
H
H
H
H
H
L
H
H
L
H
H
L
H
H
H
H
H
L
H
L
H
H
L
H
H
H
H
H
L
L
H
L
12  
13  
14  
15  
H
H
H
H
X
X
X
X
H
H
H
H
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
L
H
L
H
L
L
L
L
L
L
L
L
H
H
L
L
L
H
L
H
H
H
L
H
H
H
L
H
L
BI  
RBI  
LT  
X
H
L
X
L
X
X
L
X
X
L
X
X
L
X
X
L
X
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
2
3
4
H = HIGH Level, L = LOW Level, X = Irrelevant  
NOTES: 1. The blanking input (BI) must be open or held at a high logic level when output functions 0 through 15 are desired. The ripple-blanking input (RBI) must  
NOTES: 1. be open or high if blanking of a decimal zero is not desired.  
2. When a low logic level is applied directly to the blanking input (BI), all segment outputs are off regardless of the level of any other input.  
3. When ripple-blanking input (RBI) and inputs A, B, C, and D are at a low level with the lamp test input high, all segment outputs go off and the  
NOTES: 1. ripple-blanking output (RBO) goes to a low level (response condition).  
4. When the blanking input/ripple blanking output (BI/RBO) is open or held high and a low is applied to the lamp-test input, all segment outputs are on.  
BI/RBO is wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO).  
FAST AND LS TTL DATA  
5-404  
12345678

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