April 1992
DM54LS240/DM74LS240,
DM54LS241/DM74LS241
Octal TRI-STATEÉ Buffers/Line Drivers/Line Receivers
General Description
These buffers/line drivers are designed to improve both the performance and PC board density of TRI-STATE buffers/ drivers employed as memory-address drivers, clock drivers, and bus-oriented transmitters/receivers. Featuring 400 mV of hysteresis at each low current PNP data line input, they provide improved noise rejection and high fanout outputs and can be used to drive terminated lines down to 133X.
Features
YTRI-STATE outputs drive bus lines directly
YPNP inputs reduce DC loading on bus lines
YHysteresis at data inputs improves noise margins
Y Typical IOL (sink current)
54LS |
12 mA |
74LS |
24 mA |
Y Typical IOH (source current)
54LS |
b12 mA |
74LS |
b15 mA |
Y Typical propagation delay times
Inverting |
10.5 ns |
Noninverting |
12 ns |
YTypical enable/disable time 18 ns
YTypical power dissipation (enabled)
Inverting |
130 mW |
Noninverting |
135 mW |
Connection Diagrams
Dual-In-Line Package |
Dual-In-Line Package |
TL/F/6411 ± 1 |
TL/F/6411 ± 2 |
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Order Number DM54LS240J, |
Order Number DM54LS241J, |
DM54LS240W, DM54LS240E, |
DM54LS241W, DM54LS241E, |
DM74LS240WM or DM74LS240N |
DM74LS241WM or DM74LS241N |
See NS Package Number E20A, J20A, |
See NS Package Number E20A, J20A, |
M20B, N20A or W20A |
M20B, N20A or W20A |
Function Tables
LS240
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Inputs |
Output |
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G |
A |
Y |
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L |
L |
H |
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L |
H |
L |
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H |
X |
Z |
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LS241
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Inputs |
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Outputs |
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G |
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G |
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1A |
2A |
1Y |
2Y |
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X |
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L |
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L |
X |
L |
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X |
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L |
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H |
X |
H |
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X |
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H |
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X |
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Z |
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H |
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X |
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X |
L |
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L |
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H |
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X |
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X |
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H |
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L |
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X |
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X |
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Z |
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L e Low Logic Level
H e High Logic Level
X e Either Low or High Logic Level
Z e High Impedance
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
C1995 National Semiconductor Corporation |
TL/F/6411 |
RRD-B30M105/Printed in U. S. A. |
DM54LS241/DM74LS241 DM54LS240/DM74LS240,
Receivers Drivers/Line Buffers/Line STATE-TRI Octal
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 |
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DM54LS, 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 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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DM54LS240, 241 |
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DM74LS240, 241 |
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Units |
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Min |
Nom |
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Max |
Min |
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Nom |
Max |
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VCC |
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Supply Voltage |
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4.5 |
5 |
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5.5 |
4.75 |
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5 |
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5.25 |
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VIH |
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High Level Input Voltage |
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2 |
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2 |
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VIL |
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Low Level Input Voltage |
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0.7 |
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0.8 |
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V |
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IOH |
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High Level Output Current |
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b12 |
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b15 |
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mA |
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IOL |
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Low Level Output Current |
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12 |
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24 |
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mA |
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TA |
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Free Air Operating Temperature |
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b55 |
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125 |
0 |
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70 |
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§C |
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Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) |
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Symbol |
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Parameter |
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Conditions |
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Min |
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Typ |
Max |
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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 |
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V |
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HYS |
Hysteresis (VTa b VTb) |
VCC e Min |
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0.2 |
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0.4 |
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Data Inputs Only |
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VOH |
High Level Output Voltage |
VCC e Min, VIH e Min |
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DM74 |
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2.7 |
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VIL e Max, IOH e b1 mA |
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VCC e Min, VIH e Min |
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2.4 |
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3.4 |
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VIL e Max, IOH e b3 mA |
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VCC e Min, VIH e Min |
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DM54/DM74 |
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2 |
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VIL e 0.5V, IOH e Max |
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VOL |
Low Level Output Voltage |
VCC e Min |
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IOL e 12 mA |
DM74 |
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0.4 |
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VIL e Max |
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IOL e Max |
DM54 |
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0.4 |
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VIH e Min |
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DM74 |
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IOZH |
Off-State Output Current, |
VCC e Max |
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VO e 2.7V |
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20 |
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mA |
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High Level Voltage Applied |
VIL e Max |
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IOZL |
Off-State Output Current, |
VIH e Min |
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VO e 0.4V |
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b20 |
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mA |
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Low Level Voltage Applied |
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II |
Input Current at Maximum |
VCC e Max, VI e 7V (DM74) |
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0.1 |
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mA |
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Input Voltage |
VI e 10V (DM54) |
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IIH |
High Level Input Current |
VCC e Max, VI e 2.7V |
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20 |
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mA |
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IIL |
Low Level Input Current |
VCC e Max, VI e 0.4V |
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b0.2 |
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mA |
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IOS |
Short Circuit Output Current |
VCC e Max (Note 2) |
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b40 |
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b225 |
mA |
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ICC |
Supply Current |
VCC e Max, |
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Outputs High |
LS240, LS241 |
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13 |
23 |
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Outputs Open |
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Outputs Low |
LS240 |
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26 |
44 |
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LS241 |
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27 |
46 |
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mA |
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Outputs Disabled |
LS240 |
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29 |
50 |
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LS241 |
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32 |
54 |
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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.
2
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