參數(shù)資料
型號: MC74AC139N
廠商: ON SEMICONDUCTOR
元件分類: 通用總線功能
英文描述: DUAL 1-OF-4 DECODER/DEMULTIPLEXER
中文描述: AC SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, PDIP16
封裝: PLASTIC, DIP-16
文件頁數(shù): 2/12頁
文件大?。?/td> 108K
代理商: MC74AC139N
MC74AC139, MC74ACT139
http://onsemi.com
2
E
A
0
A
1
O
0
O
1
O
2
O
3
DECODER a
Figure 2. Logic Symbol
E
A
0
A
1
O
0
O
1
O
2
O
3
DECODER b
E
a
A
0a
A
1a
E
b
A
0b
A
1b
0
0a
0
1a
0
2a
0
3a
0
0b
0
1b
0
2b
0
3b
NOTE:
This diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation
delays.
Figure 3. Logic Diagram
FUNCTIONAL DESCRIPTION
The MC74AC139/74ACT139 is a high–speed dual
1–of–4 decoder/demultiplexer. The device has two
independent decoders, each of which accepts two binary
weighted inputs (A
0
–A
1
) and provides four mutually
exclusive active–LOW outputs (O
0
–O
3
). Each decoder has
an active–LOW enable (E). When E is HIGH all outputs are
forced HIGH. The enable can be used as the data input for
a 4–output demultiplexer application. Each half of the
MC74AC139/74ACT139 generates all four minterms of
two variables. These four minterms are useful in some
applications, replacing multiple gate functions as shown in
Figure 4, and thereby reducing the number of packages
required in a logic network.
E
A
0
A
1
E
A
0
A
1
E
A
0
A
1
E
A
0
A
1
E
A
0
A
1
E
A
0
A
1
E
A
0
A
1
E
A
0
A
1
O
0
O
0
O
1
O
1
O
2
O
2
O
3
O
3
Figure 4. Gate Functions (Each Half)
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