National Semiconductor 5485, DM5485, DM7485 Technical data
查询5485供应商
5485/DM5485/DM7485
4-Bit Magnitude Comparators
5485/DM5485/DM7485 4-Bit Magnitude Comparators
June 1989
General Description
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 expandable to any number of bits without external gates. Words of
greater length may be compared by connecting comparators in cascade. The A
stage handling less-significant bits are connected to the corresponding inputs of the next stage handling more-significant bits. The stage handling the least-significant bits must
l
B, AkB, and AeB outputs of a
Connection Diagram
Dual-In-Line Package
have a high-level voltage applied to the A
cascading paths are implemented with only a two-gate-level
delay to reduce overall comparison times for long words.
e
B input. The
Features
Y
Typical power dissipation 275 mW
Y
Typical delay (4-bit words) 23 ns
Y
Alternate Military/Aerospace device (5485) is available.
Contact a National Semiconductor Sales Office/Distributor for specifications.
Order Number 5485DMQB, 5485FMQB, DM5485J, DM5485W or DM7485N
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
See NS Package Number J16A, N16E or W16A
TL/F/6530
TL/F/6530– 1
Absolute Maximum Ratings (Note)
The ‘‘Absolute Maximum Ratings’’ are those values
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage 7V
Input Voltage 5.5V
Operating Free Air Temperature Range
DM54 and 54
DM74 0
Storage Temperature Range
b
55§Ctoa125§C
Ctoa70§C
§
b
65§Ctoa150§C
Note:
beyond which the safety of the device cannot be guaranteed. 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.
Recommended Operating Conditions
Symbol Parameter
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
High Level Input Voltage 2 2 V
Low Level Input Voltage 0.8 0.8 V
High Level Output Current
Low Level Output Current 16 16 mA
Free Air Operating Temperature
DM5485 DM7485
Min Nom Max Min Nom Max
b
0.8
b
55 125 0 70
b
Units
0.8 mA
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
e
V
I
V
OH
V
OL
I
I
I
IH
Input Clamp Voltage V
High Level Output V
Voltage V
Low Level Output V
Voltage V
Input Current@Max V
Input Voltage
High Level Input V
Current V
CC
CC
IL
CC
IH
CC
CC
I
e
e
e
eb
Min, I
e
Min, I
Max, V
e
Min, I
Min, V
e
Max, V
e
Max AkB40
2.4V
12 mA
I
e
Max
OH
e
Min
IH
e
Max
OL
e
Max
IL
e
5.5V
I
AlB40mA
Others 120
I
IL
Low Level Input V
Current V
e
Max AkB
CC
e
0.4V
I
AlB
Others
I
OS
I
CC
Note 1: All typicals are at V
Note 2: Not more than one output should be shorted at a time.
Note 3: I
Short Circuit V
Output Current (Note 2)
Supply Current V
e
e
5V, T
CC
is measured with all outputs open, AeB input grounded and all other inputs at 4.5V.
CC
25§C.
A
e
Max DM54
CC
e
Max
CC
(Note 3)
DM74
2.4 V
b
20
b
18
Typ
(Note 1)
Max Units
b
1.5 V
0.4 V
1mA
b
1.6
b
1.6 mA
b
4.8
b
55
b
55
55 88 mA
mA
C
§
2
Loading...