參數(shù)資料
型號(hào): 74138
廠商: Fairchild Semiconductor Corporation
英文描述: Decoder/Demultiplexer
中文描述: 解碼器/解復(fù)用器
文件頁數(shù): 4/8頁
文件大?。?/td> 124K
代理商: 74138
SN74LS138
http://onsemi.com
4
FUNCTIONAL DESCRIPTION
The LS138 is a high speed 1-of-8 Decoder/Demultiplexer
fabricated with the low power Schottky barrier diode
process. The decoder accepts three binary weighted inputs
(A
0
, A
1
, A
2
) and when enabled provides eight mutually
exclusive active LOW Outputs (O
0
–O
7
). The LS138
features three Enable inputs, two active LOW (E
1
, E
2
) and
one active HIGH (E
3
). All outputs will be HIGH unless E
1
and E
2
are LOW and E
3
is HIGH. This multiple enable
function allows easy parallel expansion of the device to a
1-of-32 (5 lines to 32 lines) decoder with just four LS138s
and one inverter. (See Figure a.)
The LS138 can be used as an 8-output demultiplexer by
using one of the active LOW Enable inputs as the data input
and the other Enable inputs as strobes. The Enable inputs
appropriate active HIGH or active LOW state.
TRUTH TABLE
INPUTS
OUTPUTS
E
1
E
2
E
3
A
0
A
1
A
2
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
H
X
X
L
L
L
L
L
L
L
L
X
H
X
L
L
L
L
L
L
L
L
X
X
L
H
H
H
H
H
H
H
H
X
X
X
L
H
L
H
L
H
L
H
X
X
X
L
L
H
H
L
L
H
H
X
X
X
L
L
L
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
O
0
O
31
A
0
A
1
A
2
A
3
A
4
H
LS04
A
0
A
1
A
2
E
LS138
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
LS138
123
123
123
123
Figure a
LS138
LS138
A
0
A
1
A
2
E
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
A
0
A
1
A
2
E
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
A
0
A
1
A
2
E
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
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