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DM74LS540 Octal Buffer/Line Driver with TRI-STATE(RM) Outputs
February 1992
DM74LS540
Octal Buffer/Line Driver with TRI-STATE
É
Outputs
General Description
The `LS540 is similar in function to the 'LS240, except that
the inputs and outputs are on opposite sides of the package
(see Connection Diagram). This pinout arrangement makes
this device especially useful as an output port for microproc-
essors, allowing ease of layout and greater PC board
density.
Features
Y
Hysteresis at inputs to improve noise margin
Y
PNP inputs reduce loading
Y
TRI-STATE outputs drive bus lines
Y
Inputs and outputs opposite side of package, allowing
easier interface to microprocessors
Y
Fully TTL and CMOS compatible
Connection Diagram
Dual-In-Line Package
TL/F/9813±1
Order Number DM74LS540WM or DM74LS540N
See NS Package Number M20B or N20A
Pin Name Description
E1, E2 Output Enable (Active Low)
I0±7 Data Inputs
O0±7 Data Outputs
Truth Table
Inputs
Outputs
E1
E2
D
L
L
H
L
H
X
X
Z
X
H
X
Z
L
L
L
H
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
Z
e
High Impedance
TRI-STATE
É
is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/F/9813
RRD-B30M115/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
Note: The ``AbsoluteMaximumRatings'' are those values
beyondwhich the safety of thedevice cannot be guaran-
teed.Thedeviceshouldnotbeoperatedattheselimits.The
parametricvaluesdefinedinthe``ElectricalCharacteristics''
tablearenotguaranteedattheabsolutemaximumratings.
The``RecommendedOperatingConditions''tablewilldefine
theconditionsforactualdeviceoperation.
Input Voltage
7V
Operating Free Air Temperature
DM74LS
0
§
Cto
a
70
§
C
Storage Temperature Range
b
65
§
Cto
a
150
§
C
Recommended Operating Conditions
Symbol
Parameter
DM74LS540
Units
Min
Nom
Max
V
CC
Supply Voltage
4.75
5
5.25
V
V
IH
High Level Input Voltage
2
V
V
IL
Low Level Input Voltage
0.8
V
I
OH
High Level Output Current
b
3
mA
I
OL
Low Level Output Current
24
mA
T
A
Free Air Operating Temperature
0
70
§
C
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 1)
V
I
Input Clamp Voltage
V
CC
e
Min, I
I
eb
18 mA
b
1.5
V
V
OH
High Level Output
V
CC
e
Min, I
OH
e
Max,
2.7
3.4
V
Voltage
V
IL
e
Max
V
OL
Low Level Output
V
CC
e
Min, I
OL
e
Max,
0.35
0.5
Voltage
V
IH
e
Min
V
I
OL
e
4 mA, V
CC
e
Min
0.25
0.4
I
I
Input Current
@
Max
V
CC
e
Max, V
I
e
7V
0.1
mA
Input Voltage
I
IH
High Level Input Current
V
CC
e
Max, V
I
e
2.7V
20
m
A
I
IL
Low Level Input Current
V
CC
e
Max, V
I
e
0.4V
b
0.2 mA
I
OS
Short Circuit
V
CC
e
Max
b
50
b
225 mA
Output Current
(Note 3)
I
CC
Supply Current
V
CC
e
Max
50
mA
I
OZH
TRI-STATE Output Off
V
CC
e
Max, V
O
e
2.7V
20
m
A
Current High
I
OZL
TRI-STATE Output Off
V
CC
e
Max, V
O
e
0.4V
b
20
m
A
Current Low
Note 1: All typicals are at V
CC
e
5V, T
A
e
25
§
C.
Note 2: Not more than one output should be shorted at at time, and the duration should not exceed one second.
2
Switching Characteristics
at V
CC
e
5V and T
A
e
25
§
C
Symbol
Parameter
Conditions
Min
Max
Units
t
PLH
Propagation Delay
C
L
e
50 pF
14
ns
t
PHL
Data to Output
18
t
PZH
Output Enable Time
R
L
e
667
X
,C
L
e
50 pF
23
ns
t
PZL
30
t
PLZ
Output Disable Time
R
L
e
667
X
,C
L
e
50 pF
25
ns
t
PHZ
18
*DC limits apply over operating temperature range; AC limits apply at T
A
ea
25
§
and V
CC
ea
5.0V.
Physical Dimensions
inches (millimeters)
20-Lead Wide Small Outline Molded Package (M)
Order Number DM74LS540WM
NS Package Number M20B
3
Physical Dimensions
inches (millimeters) (Continued)
20-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS540N
NS Package Number N20A
LIFE SUPPORT POLICY
NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant
support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose
be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance
support device or system, or to affect its safety or
with instructions for use provided in the labeling, can
effectiveness.
be reasonably expected to result in a significant injury
to the user.
National Semiconductor
National Semiconductor
National Semiconductor
National Semiconductor
Corporation
Europe
Hong Kong Ltd.
Japan Ltd.
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Fax: (
a
49) 0-180-530 85 86
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