DM74LS244N [NSC]

Octal TRI-STATEE Buffers/Line Drivers/Line Receivers; 八TRI- STATEE缓冲器/线路驱动器/线接收器
DM74LS244N
型号: DM74LS244N
厂家: National Semiconductor    National Semiconductor
描述:

Octal TRI-STATEE Buffers/Line Drivers/Line Receivers
八TRI- STATEE缓冲器/线路驱动器/线接收器

驱动器
文件: 总6页 (文件大小:142K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
August 1989  
54LS244/DM74LS244 Octal TRI-STATE  
Buffers/Line Drivers/Line Receivers  
É
Y
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)  
Inverting 130 mW  
Noninverting 135 mW  
Features  
Y
TRI-STATE outputs drive bus lines directly  
Y
PNP inputs reduce DC loading on bus lines  
Y
Hysteresis at data inputs improves noise margins  
Connection Diagram  
Dual-In-Line Package  
TL/F/8442–1  
Order Number 54LS244DMQB, 54LS244FMQB, 54LS244LMQB,  
DM74LS244WM or DM74LS244N  
See NS Package Number E20A, J20A, M20B, N20A or W20A  
Function Table  
Inputs  
Output  
Y
G
A
L
L
L
H
X
L
H
Z
H
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/8442  
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  
54LS  
b
b
a
55 C to 125 C  
§
0 C to 70 C  
§
a
DM74LS  
Storage Temperature Range  
§
§
§
a
65 C to 150 C  
§
Recommended Operating Conditions  
54LS244  
DM74LS244  
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  
Symbol  
Parameter  
Conditions  
Min  
Max  
Units  
(Note 1)  
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  
1 mA  
3 mA  
IL  
OH  
e
e
V
V
Min, V  
Min  
54LS/DM74  
54LS/DM74  
CC  
IH  
3.4  
V
e
e b  
Max, I  
IL  
OH  
e
e
e
V
V
Min, V  
Min  
CC  
IH  
e
0.5V, I  
Max  
IL  
OH  
e
e
e
e
V
OL  
Low Level Output Voltage  
V
V
V
Min  
Max  
Min  
I
I
12 mA  
Max  
54LS/DM74  
DM74  
0.4  
CC  
OL  
V
IL  
e
0.5  
OL  
IH  
e
e
I
I
I
Off-State Output Current,  
High Level Voltage Applied  
V
V
V
Max  
V
2.7V  
0.4V  
OZH  
OZL  
I
CC  
O
O
20  
mA  
mA  
mA  
e
e
Max  
IL  
Min  
IH  
e
Off-State Output Current,  
Low Level Voltage Applied  
V
b
20  
e
e
Input Current at Maximum  
Input Voltage  
V
CC  
Max  
V
V
7V (DM74)  
10V (54LS)  
I
0.1  
20  
e
e
e
I
e
e
I
I
High Level Input Current  
Low Level Input Current  
V
V
Max  
Max  
V
2.7V  
0.4V  
mA  
mA  
IH  
IL  
CC  
I
I
b
b
V
0.5  
200  
225  
CC  
b
54LS  
50  
40  
e
b
I
I
Short Circuit Output Current  
Supply Current  
V
CC  
Max (Note 2)  
mA  
OS  
CC  
b
DM74  
e
Outputs Open  
V
CC  
Max,  
Outputs High  
Outputs Low  
Outputs Disabled  
13  
27  
32  
23  
46  
54  
mA  
e
e
25 C.  
Note 1: All typicals are at V  
5V, T  
§
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.  
CC  
A
2
e
e
25 C (see Section 1 for Test Waveforms and Output Load)  
Switching Characteristics at V  
5V, T  
§
CC  
A
Symbol  
Parameter  
Conditions  
54LS Max  
DM74LS Max  
Units  
e
e
t
t
t
t
t
t
t
t
t
t
Propagation Delay Time  
Low to High Level Output  
C
45 pF  
PLH  
PHL  
PZL  
PZH  
PLZ  
PHZ  
PLH  
PHL  
PZL  
PZH  
L
18  
18  
ns  
R
667X  
L
e
e
Propagation Delay Time  
High to Low Level Output  
C
L
45 pF  
18  
30  
23  
25  
18  
18  
30  
23  
25  
18  
21  
22  
33  
26  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
R
667X  
L
e
e
Output Enable Time to  
Low Level  
C
L
45 pF  
R
667X  
L
e
e
Output Enable Time to  
High Level  
C
L
45 pF  
R
667X  
L
e
e
Output Disable Time  
from Low Level  
C
L
5 pF  
R
667X  
L
e
e
Output Disable Time  
from High Level  
C
L
5 pF  
R
667X  
L
e
e
Propagation Delay Time  
Low to High Level Output  
C
L
150 pF  
R
667X  
L
e
e
Propagation Delay Time  
High to Low Level Output  
C
L
150 pF  
R
667X  
L
e
e
Output Enable Time to  
Low Level  
C
L
150 pF  
R
667X  
L
e
e
Output Enable Time to  
High Level  
C
L
150 pF  
R
667X  
L
e
Note: 54LS Output Load is C  
50 pF for t  
, t  
, t  
PLH PHL PZL  
and t  
.
PZH  
L
3
Physical Dimensions inches (millimeters)  
Ceramic Leadless Chip Carrier Package (E)  
Order Number 54LS244LMQB  
NS Package Number E20A  
20-Lead Ceramic Dual-In-Line Package (J)  
Order Number 54LS244DMQB  
NS Package Number J20A  
4
Physical Dimensions inches (millimeters) (Continued)  
20-Lead Wide Small Outline Molded Package (M)  
Order Number DM74LS244WM  
NS Package Number M20B  
20-Lead Molded Dual-In-Line Package (N)  
Order Number DM74LS244N  
NS Package Number N20A  
5
Physical Dimensions inches (millimeters) (Continued)  
20-Lead Ceramic Flat Package (W)  
Order Number 54LS244FMQB  
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,  
Ocean Centre, 5 Canton Rd.  
Tsimshatsui, Kowloon  
Hong Kong  
Tel: (852) 2737-1600  
Fax: (852) 2736-9960  
Tel: 81-043-299-2309  
Fax: 81-043-299-2408  
Email: cnjwge tevm2.nsc.com  
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English Tel:  
Fran3ais Tel:  
Italiano Tel:  
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49) 0-180-530 85 85  
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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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