DM74LS241WM [NSC]
Octal TRI-STATE Buffers/Line Drivers/Line Receivers; 八路三态缓冲器/线路驱动器/线接收器
| 型号： | DM74LS241WM |
| 厂家： | 
National Semiconductor |
| 描述： | Octal TRI-STATE Buffers/Line Drivers/Line Receivers |
| 文件： | 总6页 (文件大小：145K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
April 1992
DM54LS240/DM74LS240,
DM54LS241/DM74LS241
Octal TRI-STATE Buffers/Line Drivers/Line Receivers
Y
É
Typical I (sink current)
OL
General Description
54LS
74LS
12 mA
24 mA
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.
Y
Y
Typical I
54LS
74LS
(source current)
OH
b
b
12 mA
15 mA
Typical propagation delay times
Inverting 10.5 ns
Noninverting 12 ns
Y
Y
Typical enable/disable time 18 ns
Typical power dissipation (enabled)
Features
Y
TRI-STATE outputs drive bus lines directly
Inverting 130 mW
Noninverting 135 mW
Y
PNP inputs reduce DC loading on bus lines
Y
Hysteresis at data inputs improves noise margins
Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
TL/F/6411–1
TL/F/6411–2
Order Number DM54LS240J,
DM54LS240W, DM54LS240E,
DM74LS240WM or DM74LS240N
See NS Package Number E20A, J20A,
M20B, N20A or W20A
Order Number DM54LS241J,
DM54LS241W, DM54LS241E,
DM74LS241WM or DM74LS241N
See NS Package Number E20A, J20A,
M20B, N20A or W20A
Function Tables
LS240
LS241
G
Inputs
Output
Y
Inputs
1A
Outputs
G
A
G
2A
1Y
2Y
L
L
L
H
X
H
L
X
X
X
H
H
L
L
L
L
H
X
X
X
X
X
X
X
L
L
H
Z
H
Z
H
X
X
X
L
H
Z
H
X
e
e
e
e
L
Low Logic Level
High Logic Level
H
X
Z
Either Low or High Logic Level
High Impedance
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/F/6411
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.
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.
Supply Voltage
Input Voltage
7V
7V
Operating Free Air Temperature Range
DM54LS, 54LS
b
b
a
55 C to 125 C
§
§
a
0 C to 70 C
DM74LS
§
§
a
65 C to 150 C
Storage Temperature Range
§
§
Recommended Operating Conditions
DM54LS240, 241
DM74LS240, 241
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Nom
Max
V
V
V
Supply Voltage
5
5.5
5
5.25
V
V
CC
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
IH
0.7
0.8
V
IL
b
b
I
I
12
12
125
15
24
70
mA
mA
OH
OL
b
T
A
55
0
C
§
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Typ
(Note 1)
Symbol
Parameter
Conditions
Min
Max Units
e
e
e b
I
b
1.5
V
Input Clamp Voltage
V
V
Min, I
18 mA
V
V
I
CC
b
HYS
Hysteresis (V
a
Data Inputs Only
V
)
b
T
Min
T
CC
0.2
2.7
2.4
2
0.4
e
e
V
OH
High Level Output Voltage
V
V
Min, V
Min
DM74
CC
IH
e
e b
Max, I
OH
1 mA
3 mA
IL
e
e
e
V
V
Min, V
IH
Max, I
Min
DM54/DM74
DM54/DM74
CC
3.4
V
e b
IL
OH
e
e
e
e
V
V
Min, V
IH
0.5V, I
Min
Max
CC
IL
OH
e
e
e
e
e
V
OL
Low Level Output Voltage
V
V
V
Min
Max
Min
I
I
12 mA
Max
DM74
DM54
DM74
0.4
CC
OL
IL
0.4
0.5
V
OL
IH
e
e
e
I
I
I
Off-State Output Current,
High Level Voltage Applied
V
V
V
Max
V
V
2.7V
0.4V
OZH
OZL
I
CC
O
20
mA
e
e
Max
Min
IL
IH
Off-State Output Current,
Low Level Voltage Applied
O
b
20 mA
e
e
7V (DM74)
Input Current at Maximum
Input Voltage
V
V
Max, V
I
10V (DM54)
CC
0.1
mA
e
I
e
e
e
e
e
e
I
I
I
I
High Level Input Current
Low Level Input Current
Short Circuit Output Current
Supply Current
V
V
V
V
Max, V
Max, V
2.7V
0.4V
20
mA
0.2 mA
b
225 mA
IH
CC
CC
CC
CC
I
b
IL
I
b
Max (Note 2)
40
OS
CC
Max,
Outputs High
Outputs Low
LS240, LS241
LS240
13
26
27
29
32
23
44
46
50
54
Outputs Open
LS241
mA
Outputs Disabled LS240
LS241
e
e
A
Note 1: All typicals are at V
5V, T
25 C.
§
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
CC
2
e
e
25 C
Switching Characteristics at V
5V and T
§
CC
A
DM54LS
Max
18
DM74LS
Max
14
Symbol
Parameter
Conditions
Units
ns
e
e
t
t
t
t
t
t
t
t
t
t
Propagation Delay Time
Low to High Level Output
C
45 pF
LS240
LS241
LS240
LS241
LS240
LS241
LS240
LS241
LS240
LS241
LS240
LS241
LS240
LS241
LS240
LS241
LS240
LS241
LS240
LS241
PLH
PHL
PZL
PZH
PLZ
PHZ
PLH
PHL
PZL
PZH
L
R
667X
L
18
18
e
e
Propagation Delay Time
High to Low Level Output
C
L
45 pF
18
18
ns
R
667X
L
18
18
e
e
Output Enable Time to
Low Level
C
L
45 pF
30
30
ns
R
667X
L
30
30
e
e
Output Enable Time to
High Level
C
L
45 pF
23
23
ns
R
667X
L
23
23
e
e
Output Disable Time
from Low Level
C
L
5 pF
25
25
ns
R
667X
L
25
25
e
e
Output Disable Time
from High Level
C
L
5 pF
18
18
ns
R
667X
L
18
18
e
e
Propagation Delay Time
Low to High Level Output
C
L
150 pF
18
ns
R
667X
L
21
e
e
Propagation Delay Time
High to Low Level Output
C
L
150 pF
22
ns
R
667X
L
22
e
e
Output Enable Time to
Low Level
C
L
150 pF
33
ns
R
667X
L
33
e
e
Output Enable Time to
High Level
C
L
150 pF
26
ns
R
667X
L
26
e
Note: 54LS Output load is C
50 pF for t
, t , t
PLH PHL PZL
and t
.
L
PZH
3
Physical Dimensions inches (millimeters)
Ceramic Leadless Chip Carrier Package (E)
Order Number DM54LS240E or DM54LS241E
NS Package Number E20A
20-Lead Ceramic Dual-In-Line Package (J)
Order Number DM54LS240J or DM54LS241J
NS Package Number J20A
4
Physical Dimensions inches (millimeters) (Continued)
20-Lead Wide Small Outline Molded Package (M)
Order Number DM74LS240WM or DM74LS241WM
NS Package Number M20B
20-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS240N or DM74LS241N
NS Package Number N20A
5
Physical Dimensions inches (millimeters) (Continued)
20-Lead Ceramic Flat Package (W)
Order Number DM54LS240W or DM54LS241W
NS Package Number W20A
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
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and 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 is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
National Semiconductor
Corporation
National Semiconductor
Europe
National Semiconductor
Hong Kong Ltd.
National Semiconductor
Japan Ltd.
a
1111 West Bardin Road
Arlington, TX 76017
Tel: 1(800) 272-9959
Fax: 1(800) 737-7018
Fax:
(
49) 0-180-530 85 86
@
13th Floor, Straight Block,
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Tel: (852) 2737-1600
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Tel: 81-043-299-2309
Fax: 81-043-299-2408
Email: cnjwge tevm2.nsc.com
a
a
a
a
Deutsch Tel:
English Tel:
Fran3ais Tel:
Italiano Tel:
(
(
(
(
49) 0-180-530 85 85
49) 0-180-532 78 32
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49) 0-180-534 16 80
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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