DM5485J [NSC]
4-Bit Magnitude Comparators; 4位幅度比较
| 型号： | DM5485J |
| 厂家： | 
National Semiconductor |
| 描述： | 4-Bit Magnitude Comparators |
| 文件： | 总6页 (文件大小：137K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1989
5485/DM5485/DM7485
4-Bit Magnitude Comparators
General Description
e
These 4-bit magnitude comparators perform comparison of
straight binary or BCD codes. Three fully-decoded decisions
about two 4-bit words (A, B) are made and are externally
available at three outputs. These devices are fully expand-
able to any number of bits without external gates. Words of
greater length may be compared by connecting compara-
have a high-level voltage applied to the A
B input. The
cascading paths are implemented with only a two-gate-level
delay to reduce overall comparison times for long words.
Features
Y
Typical power dissipation 275 mW
l
k
e
tors in cascade. The A B, A B, and A
B outputs of a
Y
Typical delay (4-bit words) 23 ns
stage handling less-significant bits are connected to the cor-
responding inputs of the next stage handling more-signifi-
cant bits. The stage handling the least-significant bits must
Y
Alternate Military/Aerospace device (5485) is available.
Contact a National Semiconductor Sales Office/Distrib-
utor for specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6530–1
Order Number 5485DMQB, 5485FMQB, DM5485J, DM5485W or DM7485N
See NS Package Number J16A, N16E or W16A
C
1995 National Semiconductor Corporation
TL/F/6530
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
5.5V
Operating Free Air Temperature Range
DM54 and 54
DM74
b
b
a
55 C to 125 C
§
0 C to 70 C
§
a
§
§
a
65 C to 150 C
Storage Temperature Range
§
§
Recommended Operating Conditions
DM5485
DM7485
Nom
5
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Max
V
V
V
Supply Voltage
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
0.8
0.8
V
IL
b
b
I
I
0.8
16
125
0.8
16
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
e
b
1.5
V
V
Input Clamp Voltage
V
Min, I
Min, I
12 mA
V
V
I
CC
I
High Level Output
Voltage
V
V
Max
Min
OH
CC
OH
2.4
e
e
Max, V
IL
IH
e
e
V
OL
Low Level Output
Voltage
V
V
Min, I
Max
CC
OL
0.4
V
e
e
Min, V
Max
IH
IL
@
Input Current Max
e
e
I
I
I
V
Max, V
5.5V
I
CC
1
mA
Input Voltage
k
e
High Level Input
Current
V
V
Max
A
A
B
B
40
40
IH
IL
CC
e
2.4V
I
l
mA
Others
120
k
e
b
I
Low Level Input
Current
V
V
Max
A
A
B
B
1.6
1.6
4.8
CC
e
0.4V
I
l
b
b
mA
Others
DM54
DM74
e
(Note 2)
b
b
b
b
I
I
Short Circuit
V
Max
20
18
55
55
OS
CC
CC
mA
mA
Output Current
e
(Note 3)
Supply Current
V
Max
CC
55
88
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.
CC
A
e
B input grounded and all other inputs at 4.5V.
Note 3: I
CC
is measured with all outputs open, A
2
e
e
25 C (See Section 1 for Test Waveforms and Output Load)
Switching Characteristics at V
5V and T
§
CC
A
e
e
R
400X
L
From
Input
To
Output
Number of
Symbol
Parameter
C
15 pF
Units
L
Gate Levels
Min
Max
k
l
t
Propagation Delay Time
Low-to-High Level Output
Any A or B
Data Input
A
A
B
B
PLH
PHL
3
4
3
4
1
26
35
30
30
11
ns
ns
e
A
B
k
l
t
Propagation Delay Time
High-to-Low Level Output
Any A or B
Data Input
A
A
B
B
e
l
A
A
B
B
k
B
t
t
t
t
t
t
Propagation Delay Time
Low-to-High Level Output
A
PLH
PHL
PLH
PHL
PLH
PHL
ns
ns
ns
ns
ns
ns
e
or A
B
k
B
Propagation Delay Time
High-to-Low Level Output
A
l
e
e
k
k
A
A
A
A
A
B
B
B
B
B
1
2
2
1
1
17
20
17
11
17
e
or A
B
Propagation Delay Time
Low-to-High Level Output
e
A
B
Propagation Delay Time
High-to-Low Level Output
e
l
A
A
B
Propagation Delay Time
Low-to-High Level Output
B
e
or A
B
l
B
Propagation Delay Time
High-to-Low Level Output
A
e
or A
B
Function Table
Comparing
Inputs
Cascading
Inputs
Outputs
l
k
l
k
e
e
A3, B3
A2, B2
A1, B1
A0, B0
A
B
A
B
A
B
A
B
A
B
A
B
l
A3 B3
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
L
X
X
X
X
X
X
X
X
L
X
X
X
X
X
X
X
X
L
H
L
L
H
L
L
L
L
L
L
L
L
L
L
L
H
H
L
L
k
A3 B3
l
e
e
e
e
e
e
e
e
e
e
e
e
A3
A3
A3
A3
A3
A3
A3
A3
A3
A3
A3
A3
B3
B3
B3
B3
B3
B3
B3
B3
B3
B3
B3
B3
A2 B2
H
L
k
A2 B2
H
L
l
e
e
e
e
e
e
e
e
e
e
A2
A2
A2
A2
A2
A2
A2
A2
A2
A2
e
B2
A1 B1
H
L
k
A1 B1
B2
B2
B2
B2
B2
B2
B2
B2
B2
X
H
L
l
e
e
e
e
e
e
e
e
A1
A1
A1
A1
A1
A1
A1
A1
B1
B1
B1
B1
B1
B1
B1
B1
A0 B0
H
L
k
A0 B0
H
L
e
e
e
e
e
e
A0
A0
A0
A0
A0
A0
B0
B0
B0
B0
B0
B0
H
L
H
L
L
H
L
L
H
H
L
L
X
H
L
X
H
L
L
L
L
L
L
H
H
e
e
Don’t Care
H
High Level, L
Low Level, X
3
Logic Diagram
TL/F/6530–2
4
Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 5485DMQB or DM5485J
NS Package Number J16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM7485N
NS Package Number N16E
5
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Packge (W)
Order Number 5485FMQB or DM5485W
NS Package Number W16A
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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.
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