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National Semiconductor Electronic Components Datasheet

74155 Datasheet

Dual 2-Line to 4-Line Decoders/Demultiplexers

No Preview Available !

74155 pdf
February 1993
DM54155 DM74155 Dual 2-Line to 4-Line
Decoders Demultiplexers
General Description
These TTL circuits feature dual 1-line-to-4-line demultiplex-
ers with individual strobes and common binary-address in-
puts in a single 16-pin package When both sections are
enabled by the strobes the common address inputs se-
quentially select and route associated input data to the ap-
propriate output of each section The individual strobes per-
mit activating or inhibiting each of the 4-bit sections as de-
sired Data applied to input C1 is inverted at its outputs and
data applied at C2 is true through its outputs The inverter
following the C1 data input permits use as a 3-to-8-line de-
coder or 1-to-8-line demultiplexer without external gating
Input clamping diodes are provided on these circuits to mini-
mize transmission-line effects and simplify system design
Features
Y Applications
Dual 2-to-4-line decoder
Dual 1-to-4-line demultiplexer
3-to-8-line decoder
1-to-8-line demultiplexer
Y Individual strobes simplify cascading for decoding or
demultiplexing larger words
Y Input clamping diodes simplify system design
Connection Diagram and Function Tables
Dual-In-Line Package
Select
BA
XX
LL
LH
HL
HH
XX
2-Line-to-4-Line Decoder or
1-Line-to-4-Line Demultiplexer
Inputs
Outputs
Strobe Data
G1 C1 1Y0 1Y1 1Y2
H X HHH
L H LHH
L H HLH
L H HHL
L H HHH
X L HHH
1Y3
H
H
H
H
L
H
TL F 6549 – 1
Order Number DM54155J DM54155W or DM74155N
See NS Package Number J16A N16A or W16A
Inputs
Outputs
Select Strobe Data
B A G2
C2 2Y0 2Y1 2Y2 2Y3
XX
LL
LH
HL
HH
XX
H
L
L
L
L
X
X HHHH
L LHHH
L HLHH
L HHLH
L HHHL
H HHHH
C e inputs C1 and C2 connected together
G e inputs G1 and G2 connected together
H e high level L e low level X e don’t care
3-Line-to-8-Line Decoder or
1-Line-to-8-Line Demultiplexer
Inputs
Outputs
Select
Strobe
Or Data
(0)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
C B A G 2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3
X XX
L LL
L LH
L HL
L HH
H LL
H LH
H HL
H HH
H
L
L
L
L
L
L
L
L
HHHHHHHH
L HHHHHHH
H L HHHHHH
HH L HHHHH
HHH L HHHH
HHHH L HHH
HHHHH L HH
HHHHHH L H
HHHHHHH L
C1995 National Semiconductor Corporation TL F 6549
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

74155 Datasheet

Dual 2-Line to 4-Line Decoders/Demultiplexers

No Preview Available !

74155 pdf
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
5 5V
Operating Free Air Temperature Range
DM54
b55 C to a125 C
DM74
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
Min
45
2
b55
DM54155
Nom
5
Max
55
08
b0 8
16
125
Min
4 75
2
0
DM74155
Nom
5
Max
5 25
08
b0 8
16
70
Units
V
V
V
mA
mA
C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Typ
Min
(Note 1)
VI
VOH
VOL
II
Input Clamp Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Current Max
Input Voltage
VCCeMin IIe b12 mA
VCC e Min IOH e Max
VIL e Max VIH e Min
VCC e Min IOL e Max
VIH e Min VIL e Max
VCC e Max VIe 5 5V
24
IIH
High Level Input Current
VCC e Max VI e 2 4V
IIL
Low Level Input Current
VCC e Max VI e 0 4V
IOS Short Circuit
Output Current
VCC e Max
(Note 2)
DM54
DM74
b20
b18
ICC Supply Current
VCC e Max
(Note 3)
DM54
DM74
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time
Note 3 ICC is measured with the outputs open A B and C1 inputs at 4 5V and C2 G1 and G2 inputs grounded
25
25
Max
b1 5
04
1
40
b1 6
b55
b55
35
40
Units
V
V
V
mA
mA
mA
mA
mA
2


Part Number 74155
Description Dual 2-Line to 4-Line Decoders/Demultiplexers
Maker National Semiconductor
Total Page 6 Pages
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