參數(shù)資料
型號(hào)： SN54LS249
廠商： Motorola, Inc.
英文描述： BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS
中文描述： BCD碼到七段解碼器/驅(qū)動(dòng)器
文件頁(yè)數(shù)： 3/8頁(yè)
文件大小： 280K
代理商： SN54LS249
5-404
FAST AND LS TTL DATA
SN54/74LS247
SN54/74LS248
SN54/74LS249
LS247
FUNCTION TABLE
DECIMAL
FUNCTION
INPUTS
BI/RBO
OUTPUTS
NOTE
OR
LT
RBI
D
C
B
A
a
b
c
d
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
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
ON
ON
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
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
H
OFF
ON
ON
ON
ON
OFF
OFF
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
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
H
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
ON
ON
ON
ON
ON
ON
OFF
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
ON
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
H
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
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
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
2
3
4
LS248, LS249
FUNCTION TABLE
DECIMAL
FUNCTION
INPUTS
BI/RBO
OUTPUTS
NOTE
OR
LT
RBI
D
C
B
A
a
b
c
d
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
H
L
H
H
H
H
H
H
H
H
L
H
H
L
H
H
H
L
H
L
H
L
L
L
L
L
H
H
1
1
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
H
L
H
H
H
H
L
L
H
H
H
H
H
L
H
H
L
L
L
H
L
H
H
H
L
H
H
H
L
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
H
L
L
H
H
L
L
H
H
L
H
H
H
H
H
H
L
H
L
H
H
L
L
H
H
H
H
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
H
L
H
L
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
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).
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