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74155 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - DUAL 1-OF-4 DECODER/DEMULTIPLEXER - ON Semiconductor

भाग संख्या 74155
समारोह DUAL 1-OF-4 DECODER/DEMULTIPLEXER
मैन्युफैक्चरर्स ON Semiconductor 
लोगो ON Semiconductor लोगो 
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74155 pdf
LOGIC DIAGRAM
SN74LS155
SN54 / 74LS156
Ea Ea
12
A0 A1
13 3
Eb Eb
14 15
VGCNCD==PPININ186
= PIN NUMBERS
7
O0a
6
O1a
5
O2a
4
O3a
9
O0b
10
O1b
11 12
O2b O3b
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 (EaEa). 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 (EbEb). 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
TRUTH TABLE
ADDRESS ENABLE “a”
OUTPUT “a”
A0 A1 Ea Ea O0 O1 O2
XXL XHHH
XXXHHHH
L LH L LHH
HLHLHLH
L HH L HH L
HHH L HHH
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
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
EE
A0
A1
O0
A0
A1
O0
EE
A0 O1 A0
A1 A1
EE
A0 O2 A0
A1 A1
EE
A0 O3 A0
A1 A1
O1
O2
O3
Figure a
ENABLE “b”
OUTPUT “b”
O3 Eb Eb O0 O1 O2 O3
HH X H HH H
HXHHHHH
HL L L HHH
HL LH LHH
HL LHHLH
L L LHHH L
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