74LS155 Decoders/Demultiplexers Datasheet

74LS155 Datasheet, PDF, Equivalent


Part Number

74LS155

Description

Dual 2-Line to 4-Line Decoders/Demultiplexers

Manufacture

National Semiconductor

Total Page 8 Pages
Datasheet
Download 74LS155 Datasheet


74LS155
June 1989
54LS155 DM54LS155 DM74LS155
54LS156 DM54LS156 DM74LS156
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
Y Choice of outputs
Totem-pole (LS155)
Open-collector (LS156)
Y Alternate Military Aerospace device (54LS155 156) is
available Contact a National Semiconductor Sales Of-
fice Distributor for specifications
Connection Diagram and Function Tables
Dual-In-Line Package
Order Number 54LS155DMQB 54LS155FMQB
54LS155LMQB DM54LS155J DM54LS155W
DM74LS155M DM74LS155N 54LS156DMQB
54LS156FMQB DM54LS156J DM54LS156W
DM74LS156M or DM74LS156N
See NS Package Number E20A J16A
M16A N16E or W16A
TL F 6395 – 1
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
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
Inputs
Outputs
Select Strobe Data
B A G2
C2 2Y0 2Y1 2Y2
XX
LL
LH
HL
HH
XX
H
L
L
L
L
X
X HHH
L LHH
L HLH
L HHL
L HHH
H HHH
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
1Y3
H
H
H
H
L
H
2Y3
H
H
H
H
L
H
C1995 National Semiconductor Corporation TL F 6395
RRD-B30M105 Printed in U S A

74LS155
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
7V
Operating Free Air Temperature Range
DM54LS and 54LS
b55 C to a125 C
DM74LS
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
VOH
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
DM54LS155
Nom
Max
5 55
07
b0 4
4
125
Min
4 75
2
0
DM74LS155
Nom
Max
5 5 25
08
b0 4
8
70
Units
V
V
V
mA
mA
C
’LS155 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
VOH
Input Clamp Voltage
High Level Output
Voltage
VCC e Min II e b18 mA
VCC e Min IOH e Max
VIL e Max VIH e Min
DM54
DM74
25
27
VOL Low Level Output
Voltage
VCC e Min IOL e Max
VIL e Max VIH e Min
DM54
DM74
IOL e 4 mA VCC e Min
DM74
II
Input Current Max
VCC e Max VI e 7V
Input Voltage
IIH
High Level Input Current
VCC e Max VI e 2 7V
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
b20
ICC Supply Current
VCC e Max (Note 3)
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 and the duration should not exceed one second
Note 3 ICC is measured with all outputs open A B and C1 inputs at 4 5V and C2 G1 and G2 inputs grounded
Typ
(Note 1)
34
34
0 25
0 35
0 25
61
Max
b1 5
04
05
04
01
20
b0 36
b100
b100
10
Units
V
V
V
mA
mA
mA
mA
mA
2


Features 54LS155 DM54LS155 DM74LS155 54LS156 DM54 LS156 DM74LS156 Dual 2-Line to 4-Line D ecoders Demultiplexers June 1989 54LS 155 DM54LS155 DM74LS155 54LS156 DM54LS1 56 DM74LS156 Dual 2-Line to 4-Line Deco ders Demultiplexers General Description These TTL circuits feature dual 1-line -to-4-line demultiplexers with individu al strobes and common binary-address in puts in a single 16-pin package When bo th sections are enabled by the strobes the common address inputs sequentially select and route associated input data to the appropriate output of each secti on The individual strobes permit activa ting or inhibiting each of the 4-bit se ctions as desired Data applied to input C1 is inverted at its outputs and data applied at C2 is true through its outp uts The inverter following the C1 data input permits use as a 3-to-8-line deco der or 1-to-8-line demultiplexer withou t external gating Input clamping diodes are provided on these circuits to mini mize transmission-line effects and simplify system design Feat.
Keywords 74LS155, datasheet, pdf, National Semiconductor, Dual, 2-Line, to, 4-Line, Decoders/Demultiplexers, 4LS155, LS155, S155, 74LS15, 74LS1, 74LS, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




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