54LS125 [NSC]
Quad TRI-STATE Buffers; 四三态缓冲器
| 型号： | 54LS125 |
| 厂家： | 
National Semiconductor |
| 描述： | Quad TRI-STATE Buffers |
| 文件： | 总6页 (文件大小：125K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1989
54LS125A/DM54LS125A/DM74LS125A
Quad TRI-STATE Buffers
É
General Description
This device contains four independent gates each of which
performs a non-inverting buffer function. The outputs have
the TRI-STATE feature. When enabled, the outputs exhibit
the low impedance characteristics of a standard LS output
with additional drive capability to permit the driving of bus
lines without external resistors. When disabled, both the
output transistors are turned off presenting a high-imped-
ance state to the bus line. Thus the output will act neither as
a significant load nor as a driver. To minimize the possibility
that two outputs will attempt to take a common bus to oppo-
site logic levels, the disable time is shorter than the enable
time of the outputs.
Features
Y
Alternate Military/Aerospace device (54LS125) is avail-
able. Contact a National Semiconductor Sales Office/
Distributor for specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6387–1
Order Number 54LS125ADMQB, 54LS125AFMQB, 54LS125ALMQB,
DM54LS125AJ, DM54LS125AW, DM74LS125AM or DM74LS125AN
See NS Package Number E20A, J14A, M14A, N14A or W14B
Function Table
e
Y
A
Inputs
Output
Y
A
C
L
H
X
L
L
L
H
H
Hi-Z
e
e
e
H
L
High Logic Level
Low Logic Level
X
Either Low or High Logic Level
e
Hi-Z
TRI-STATE (Outputs are disabled)
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/F/6387
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 and 54LS
DM74LS
b
b
a
a
55 C to 125 C
§
§
0 C to 70 C
§
§
a
65 C to 150 C
Storage Temperature Range
§
§
Recommended Operating Conditions
DM54LS125A
DM74LS125A
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
1
2.6
24
70
mA
mA
OH
OL
12
b
T
A
55
125
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
e
b
1.5
V
V
Input Clamp Voltage
V
Min, I
Min, I
18 mA
V
V
I
CC
I
High Level Output
Voltage
V
V
Max
Min
OH
CC
OH
2.4
3.4
e
e
Max, V
IL
IH
e
e
V
OL
Low Level Output
Voltage
V
V
Min, I
Max
DM54
DM74
DM74
0.25
0.35
0.25
0.4
CC
OL
e
Max
IL
0.5
0.4
V
e
e
I
12 mA, V
Min
OL
CC
@
Input Current Max
Input Voltage
e
e
I
I
I
I
V
V
V
Max, V
Max, V
Max, V
Max, V
7V
I
CC
I
0.1
20
mA
e
e
e
e
e
High Level Input
Current
2.7V
0.4V
mA
IH
CC
CC
I
Low Level Input
Current
IL
I
b
0.4
mA
e
Off-State Output Current
with High Level Output
Voltage Applied
V
CC
V
IH
2.4V
Max
OZH
O
e
e
Min, V
IL
20
mA
e
Max, V
e
I
Off-State Output Current
with Low Level Output
Voltage Applied
V
CC
V
IH
0.4V
OZL
O
e
e
b
20
Min, V
Max
mA
IL
e
(Note 2)
b
b
b
I
I
Short Circuit
Output Current
V
CC
Max
DM54
DM74
20
20
100
100
OS
CC
mA
mA
b
e
Supply Current
V
CC
Max (Note 3)
11
20
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
CC
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3: I is measured with the data control (C) inputs at 4.5V and the data inputs grounded.
A
CC
2
e
e
25 C (See Section 1 for Test Waveforms and Output Load)
Switching Characteristics at V
5V and T
§
CC
A
e
R
L
667X
e
e
L
Symbol
Parameter
C
50 pF
Max
C
150 pF
Max
Units
L
Min
Min
t
t
t
t
t
t
Propagation Delay Time Low
to High Level Output
PLH
PHL
PZH
PZL
PHZ
PLZ
15
18
25
25
20
20
21
22
35
40
ns
ns
ns
ns
ns
ns
Propagation Delay Time High
to Low Level Output
Output Enable Time to
High Level Output
Output Enable Time to
Low Level Output
Output Disable Time from
High Level Output (Note 1)
Output Disable Time from
Low Level Output (Note 1)
e
Note 1: C
5pF.
L
3
Physical Dimensions inches (millimeters)
Ceramic Leadless Chip Carrier Package (E)
Order Number 54LS125ALMQB
NS Package Number E20A
14-Lead Ceramic Dual-In-Line Package (J)
Order Number 54LS125ADMQB or DM54LS125AJ
NS Package Number J14A
4
Physical Dimensions inches (millimeters) (Continued)
14-Lead Small Outline Molded Package (M)
Order Number DM74LS125AM
NS Package Number M14A
14-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS125AN
NS Package Number N14A
5
Physical Dimensions inches (millimeters) (Continued)
14-Lead Ceramic Flat Package (W)
Order Number 54LS125AFMQB or DM54LS125AW
NS Package Number W14B
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