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SN74LSXXXD датащи(PDF) 2 Page - ON Semiconductor

номер детали SN74LSXXXD
подробное описание детали  DUAL 1-OF-4 DECODER
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

SN74LSXXXD датащи(HTML) 2 Page - ON Semiconductor

  SN74LSXXXD Datasheet HTML 1Page - ON Semiconductor SN74LSXXXD Datasheet HTML 2Page - ON Semiconductor SN74LSXXXD Datasheet HTML 3Page - ON Semiconductor SN74LSXXXD Datasheet HTML 4Page - ON Semiconductor  
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SN74LS155
http://onsemi.com
2
SN54/74LS156
LOGIC DIAGRAM
Ea Ea
A0 A1
Eb Eb
O0a
O1a
O2a
O3a
O0b
O1b
O2b
O3b
14
12
6
7
3
4
5
9
11
12
10
13
15
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
FUNCTIONAL DESCRIPTION
The LS156 is a Dual 1-of-4 Decoder/Demultiplexer with
common Address inputs and separate gated Enable inputs.
When enabled, each decoder section accepts the binary
weighted Address inputs (A0, A1) and provides four mutually
exclusive active LOW outputs (O0−O3). If the Enable
requirements of each decoder are not met, all outputs of that
decoder are HIGH.
Each decoder section has a 2-input enable gate. The
enable gate for Decoder “a” requires one active HIGH input
and one active LOW input (Ea•Ea). In demultiplexing
applications, Decoder “a” can accept either true or
complemented data by using the Ea or Ea inputs respectively.
The enable gate for Decoder “b” requires two active LOW
inputs (Eb•Eb). The LS155 or LS156 can be used as a 1-of-8
Decoder/Demultiplexer by tying Ea to Eb and relabeling the
common connection as (A2). The other Eb and Ea are
connected together to form the common enable.
The LS156 can be used to generate all four minterms of
two variables. These four minterms are useful in some
applications replacing multiple gate functions as shown in
Fig. a. The LS156 has the further advantage of being able to
AND the minterm functions by tying outputs together. Any
number of terms can be wired-AND as shown below.
f = (E + A0 + A1) ⋅ (E + A0 + A1) ⋅ (E + A0 + A1) ⋅
(E + A0 + A1)
where E = Ea + Ea; E = Eb + Eb
Figure a
E
A0
A1
E
A0
A1
E
A0
A1
E
A0
A1
O0
O1
O2
O3
E
A0
A1
E
A0
A1
E
A0
A1
E
A0
A1
O0
O1
O2
O3
TRUTH TABLE
ADDRESS
ENABLE “a”
OUTPUT “a”
ENABLE “b”
OUTPUT “b”
A0
A1
Ea
Ea
O0
O1
O2
O3
Eb
Eb
O0
O1
O2
O3
X
X
L
X
H
H
H
H
H
X
H
H
H
H
X
XX
HH
HH
HX
HH
HH
H
L
LH
LL
HH
H
L
LL
HH
H
H
LH
LH
LH
H
L
LH
LH
H
L
HH
LH
HL
H
L
LH
HL
H
H
H
H
L
H
H
H
L
L
L
H
H
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care


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Аналогичное описание - SN74LSXXXD

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