DM74LS151
Data Selector/Multiplexer
General Description
This data selector/multiplexer contains full on-chip decoding
to select the desired data source. The ’LS151 selects
one-of-eight data sources. The ’LS151 has a strobe input
which must be at a low logic level to enable these devices. A
high level at the strobe forces the W output high, and the Y
output low.
The ’LS151 features complementary W and Y outputs.
Features
nSelect one-of-eight data lines
nPerforms parallel-to-serial conversion
nPermits multiplexing from N lines to one line
nAlso for use as Boolean function generator
nTypical average propagation delay time data input to W
output 12.5 ns
nTypical power dissipation 30 mW
Connection Diagram
Dual-In-Line Package
DS006392-1
Order Number 54LS151DMQB, 54LS151FMQB, 54LS151LMQB,
DM54LS151J, DM54LS151W, DM74LS151M or DM74LS151N
See Package Number E20A, J16A, M16A, N16E or W16A
March 1998
DM74LS151 Data Selector/Multiplexer
© 1998 Fairchild Semiconductor Corporation DS006392 www.fairchildsemi.com
Truth Table
Inputs Outputs
Select Strobe Y W
CBA S
XXX H L H
LLL L D0D0
L L H L D1 D1
LHL L D2D2
L H H L D3 D3
H L L L D4 D4
HLH L D5D5
H H L L D6 D6
HHH L D7D7
H
=
High Level, L =Low Level, X =Don’t Care
D0, D1...D7 =the level of the respective D input
www.fairchildsemi.com 2
Absolute Maximum Ratings (Note 1)
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range
DM54LS and 54LS −55˚C to +125˚C
DM74LS 0˚C to +70˚C
Storage Temperature Range −65˚C to +150˚C
Recommended Operating Conditions
Symbol Parameter DM54LS151 DM74LS151 Units
Min Nom Max Min Nom Max
V
CC
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
V
IH
High Level Input Voltage 2 2 V
V
IL
Low Level Input Voltage 0.7 0.8 V
I
OH
High Level Output Current −0.4 −0.4 mA
I
OL
Low Level Output Current 4 8 mA
T
A
Free Air Operating Temperature −55 125 0 70 ˚C
Note 1:
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. 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.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min Typ Max Units
(Note 2)
V
I
Input Clamp Voltage V
CC
=Min, I
I
=−18 mA −1.5 V
V
OH
High Level Output V
CC
=Min, I
OH
=Max DM54 2.5 3.4 V
Voltage V
IL
=Max, V
IH
=Min DM74 2.7 3.4
V
OL
Low Level Output V
CC
=Min, I
OL
=Max DM54 0.25 0.4
Voltage V
IL
=Max, V
IH
=Min DM74 0.35 0.5 V
I
OL
=4 mA, V
CC
=Min DM74 0.25 0.4
I
I
Input Current @Max V
CC
=Max, V
I
=7V 0.1 mA
Input Voltage
I
IH
High Level Input Current V
CC
=Max, V
I
=2.7V 20 µA
I
IL
Low Level Input Current V
CC
=Max, V
I
=0.4V −0.4 mA
I
OS
Short Circuit V
CC
=Max DM54 −20 −100 mA
Output Current (Note 3) DM74 −20 −100
I
CC
Supply Current V
CC
=Max (Note 4) 6 10 mA
Note 2: All typicals are at VCC =5V, TA=25˚C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 4: ICC is measured with all outputs open, strobe and data select inputs at 4.5V, and all other inputs open.
Switching Characteristics
at V
CC
=5V and T
A
=25˚C
From (Input) R
L
=2kΩ
Symbol Parameter To (output) C
L
=15 pF C
L
=50 pF Units
Min Max Min Max
t
PLH
Propagation Delay Time Select 43 46 ns
Low to High Level Output (4 Levels) to Y
t
PHL
Propagation Delay Time Select 30 36 ns
High to Low Level Output (4 Levels) to Y
t
PLH
Propagation Delay Time Select 23 25 ns
Low to High Level Output (3 Levels) to W
3 www.fairchildsemi.com
Switching Characteristics (Continued)
at V
CC
=5V and T
A
=25˚C
From (Input) R
L
=2kΩ
Symbol Parameter To (output) C
L
=15 pF C
L
=50 pF Units
Min Max Min Max
t
PHL
Propagation Delay Time Select 32 40 ns
High to Low Level Output (3 Levels) to W
t
PLH
Propagation Delay Time Strobe 42 44 ns
Low to High Level Output to Y
t
PHL
Propagation Delay Time Strobe 32 40 ns
High to Low Level Output to Y
t
PLH
Propagation Delay Time Strobe 24 27 ns
Low to High Level Output to W
t
PHL
Propagation Delay Time Strobe 30 36 ns
High to Low Level Output to W
t
PLH
Propagation Delay Time D0 thru D7 32 35 ns
Low to High Level Output to Y
t
PHL
Propagation Delay Time D0 thru D7 26 33 ns
High to Low Level Output to Y
t
PLH
Propagation Delay Time D0 thru D7 21 25 ns
Low to High Level Output to W
t
PHL
Propagation Delay Time D0 thru D7 20 27 ns
High to Low Level Output to W
www.fairchildsemi.com 4
Logic Diagram
LS151
DS006392-2
See Address Buffers to the Right
Address Buffers for 54LS151/74LS151
DS006392-3
5 www.fairchildsemi.com
Physical Dimensions inches (millimeters) unless otherwise noted
Ceramic Leadless Chip Carrier Package (E)
Order Number 54LS151LMQB
Package Number E20A
Ceramic Dual-In-Line Package (J)
Order Number 54LS151DMQB or DM54LS151J
Package Number J16A
www.fairchildsemi.com 6
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS151M
Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS151N
Package Number N16E
7 www.fairchildsemi.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE-
VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMI-
CONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or sys-
tems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, and (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
Fairchild Semiconductor
Corporation
Americas
Customer Response Center
Tel: 1-888-522-5372
www.fairchildsemi.com
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Europe Fax: +49 (0) 1 80-530 85 86
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Tel: +852 2737-7200
Fax: +852 2314-0061
National Semiconductor
Japan Ltd.
Tel: 81-3-5620-6175
Fax: 81-3-5620-6179
16-Lead Ceramic Flat Package (W)
Order Number 54LS151FMQB or DM54LS151W
Package Number W16A
DM74LS151 Data Selector/Multiplexer
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
