June 1989
54LS151/DM54LS151/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
YSelect one-of-eight data lines
YPerforms parallel-to-serial conversion
YPermits multiplexing from N lines to one line
YAlso for use as Boolean function generator
YTypical average propagation delay time data input to W output 12.5 ns
YTypical power dissipation 30 mW
YAlternate Military/Aerospace device (54LS151) is available. Contact a National Semiconductor Sales Office/ Distributor for specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6392 ± 1
Order Number 54LS151DMQB, 54LS151FMQB, 54LS151LMQB,
DM54LS151J, DM54LS151W, DM74LS151M or DM74LS151N
See NS Package Number E20A, J16A, M16A, N16E or W16A
Truth Table
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Inputs |
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Outputs |
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Select |
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Strobe |
Y |
W |
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S |
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C |
B |
A |
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X |
X |
X |
H |
L |
H |
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L |
L |
L |
L |
D0 |
D0 |
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L |
L |
H |
L |
D1 |
D1 |
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L |
H |
L |
L |
D2 |
D2 |
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L |
H |
H |
L |
D3 |
D3 |
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H |
L |
L |
L |
D4 |
D4 |
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H |
L |
H |
L |
D5 |
D5 |
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H |
H |
L |
L |
D6 |
D6 |
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H |
H |
H |
L |
D7 |
D7 |
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H e High Level, L e Low Level, X e Don't Care
D0, D1...D7 e the level of the respective D input
Selector/Multiplexer Data 54LS151/DM54LS151/DM74LS151
C1995 National Semiconductor Corporation |
TL/F/6392 |
RRD-B30M105/Printed in U. S. A. |
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 |
b55§C to a125§C |
DM54LS and 54LS |
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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 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.
Recommended Operating Conditions
Symbol |
Parameter |
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DM54LS151 |
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DM74LS151 |
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Units |
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Min |
Nom |
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Max |
Min |
Nom |
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Max |
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VCC |
Supply Voltage |
4.5 |
5 |
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5.5 |
4.75 |
5 |
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5.25 |
V |
VIH |
High Level Input Voltage |
2 |
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2 |
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V |
VIL |
Low Level Input Voltage |
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0.7 |
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0.8 |
V |
IOH |
High Level Output Current |
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b0.4 |
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b0.4 |
mA |
IOL |
Low Level Output Current |
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4 |
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8 |
mA |
TA |
Free Air Operating Temperature |
b55 |
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125 |
0 |
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70 |
§C |
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol |
Parameter |
Conditions |
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Min |
Typ |
Max |
Units |
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(Note 1) |
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VI |
Input Clamp Voltage |
VCC e Min, II e b18 mA |
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b1.5 |
V |
VOH |
High Level Output |
VCC e Min, IOH e Max |
DM54 |
2.5 |
3.4 |
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V |
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Voltage |
VIL e Max, VIH e Min |
DM74 |
2.7 |
3.4 |
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VOL |
Low Level Output |
VCC e Min, IOL e Max |
DM54 |
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0.25 |
0.4 |
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Voltage |
VIL e Max, VIH e Min |
DM74 |
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0.35 |
0.5 |
V |
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IOL e 4 mA, VCC e Min |
DM74 |
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0.25 |
0.4 |
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II |
Input Current @ Max |
VCC e Max, VI e 7V |
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0.1 |
mA |
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Input Voltage |
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IIH |
High Level Input Current |
VCC e Max, VI e 2.7V |
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20 |
mA |
IIL |
Low Level Input Current |
VCC e Max, VI e 0.4V |
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b0.4 |
mA |
IOS |
Short Circuit |
VCC e Max |
DM54 |
b20 |
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b100 |
mA |
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Output Current |
(Note 2) |
DM74 |
b20 |
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b100 |
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ICC |
Supply Current |
VCC e Max (Note 3) |
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6 |
10 |
mA |
Note 1: All typicals are at VCC e 5V, TA e 25§C. |
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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, strobe and data select inputs at 4.5V, and all other inputs open.
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