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74F139 bảng dữ liệu(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện 74F139
Giải thích chi tiết về linh kiện  Dual 1-of-4 Decoder/Demultiplexer
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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74F139 bảng dữ liệu(HTML) 2 Page - National Semiconductor (TI)

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Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
A0 A1
Address Inputs
1010
20 mA b06 mA
E
Enable Inputs (Active LOW)
1010
20 mA b06 mA
O0–O3
Outputs (Active LOW)
50333
b
1 mA20 mA
Functional Description
The ’F139 is a high-speed dual 1-of-4 decoderdemultiplex-
er The device has two independent decoders each of
which accepts two binary weighted inputs (A0–A1) and pro-
vides four mutually exclusive active LOW Outputs (O0–O3)
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 ’F139 generates all four minterms of two
variables These four minterms are useful in some applica-
tions replacing multiple gate functions as shown in
Figure 1
and thereby reducing the number of packages required in a
logic network
Truth Table
Inputs
Outputs
E
A0
A1
O0
O1
O2
O3
HX
X
H
H
H
H
LL
L
L
H
H
H
LH
L
H
L
H
H
LL
H
H
H
L
H
LH
H
H
H
H
L
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
TLF9479 – 6
FIGURE 1 Gate Functions
(each half)
Logic Diagram
TLF9479 – 5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
2


Số phần tương tự - 74F139

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Mô tả tương tự - 74F139

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