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TL/F/9792
9324/DM9324 5-Bit Comparator
June 1989
9324/DM9324 5-Bit Comparator
General Description
The 9324 expandable comparators provide comparison between two 5-bit words and give three outputsБ‘less than’’,
‘‘greater than’’ and ‘‘equal to’’. A HIGH on the active LOW
Enable Input forces all three outputs LOW.
Connection Diagram
Dual-In-Line Package
TL/F/9792– 1
Order Number 9324DMQB, 9324FMQB, or DM9324N
See NS Package Number J16A, N16E or W16A
Pin Names Description
E Enable Input (Active LOW)
A0–A4 Word A Parallel Inputs
B0–B4 Word B Parallel Inputs
A
k
B A Less than B Output (Active HIGH)
A
l
B A Greater than B Output (Active HIGH)
A
e
B A Equal to B Output (Active HIGH)
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
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Absolute Maximum Ratings (Note)
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
Military
b
55§Ctoa125§C
Commercial 0
§
Ctoa70§C
Storage Temperature Range
b
65§Ctoa150§C
Note:
The ‘‘Absolute Maximum Ratings’’ are those values
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
Military Commercial
Units
Min Nom Max Min Nom Max
V
CC
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
V
IH
High Level Input Voltage 2 2 V
V
IL
Low Level Input Voltage 0.8 0.8 V
I
OH
High Level Output Current
b
0.8
b
0.8 mA
I
OL
Low Level Output Current 16 16 mA
T
A
Free Air Operating Temperature
b
55 125 0 70
§
C
Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
Typ
Max Units
(Note 1)
V
I
Input Clamp Voltage V
CC
e
Min, I
I
eb
12 mA
b
1.5 V
V
OH
High Level Output Voltage V
CC
e
Min, I
OH
e
Max
2.4 3.4 V
V
IL
e
Max
V
OL
Low Level Output Voltage V
CC
e
Min, I
OL
e
Max
0.2 0.4 V
V
IH
e
Min
I
I
Input Current@Max V
CC
e
Max, V
I
e
5.5V
1mA
Input Voltage
I
IH
High Level Input Current V
CC
e
Max, V
I
e
2.4V 80 mA
I
IL
Low Level Input Current V
CC
e
Max, V
I
e
0.4V
b
3.2 mA
I
OS
Short Circuit V
CC
e
Max MIL
b
20
b
70
mA
Output Current (Note 2)
COM
b
20
b
70
I
CC
Supply Current V
CC
e
Max 81 mA
Note 1: All typicals are at V
CC
e
5V, T
A
e
25§C.
Note 2: Not more than one output should be shorted at a time.
2
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Switching Characteristics
V
CC
ea
5.0V, T
A
ea
25§C (See Section 1 for waveforms and load configurations)
Symbol Parameter
C
L
e
15 pF
Units
Min Max
t
PLH
Propagation Delay 14
ns
t
PHL
E to AeB14
t
PLH
Propagation Delay 25
ns
t
PHL
An,Bnto AlB22
t
PLH
Propagation Delay 26
ns
t
PHL
An,Bnto AkB21
t
PLH
Propagation Delay 30
ns
t
PHL
An,Bnto AeB32
Functional Description
The ’24 5-bit comparators use combinational circuitry to directly generate ‘‘A greater than B’’ and ‘‘A less than B’’
outputs. As evident from the logic diagram, these outputs
are generated in only three gate delays. The ‘‘A equals B’’
output is generated in one additional gate delay by decoding
the ‘‘A neither less than nor greater than B’’ condition with a
NOR gate. All three outputs are activated by the active LOW
Enable Input (E
).
Tying the A
l
B output from one device into an A input on
another device and the A
k
B output into the corresponding
B input permits easy expansion.
The A4 and B4 inputs are the most significant inputs and
A0, B0 the least significant. Thus if A4 is HIGH and B4 is
LOW, the A
l
B output will be HIGH regardless of all other
inputs except E
.
Truth Table
Inputs Outputs
E A
n
B
n
AkBAlBAeB
HX X L L L
L Word A
e
Word B L L H
L Word A
l
Word B L H L
L Word B
l
Word A H L L
HeHIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
Logic Symbol
TL/F/9792– 2
V
CC
e
Pin 16
GND
e
Pin 6
3
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Logic Diagram
TL/F/9792– 3
4
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Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 9324DMQB
NS Package Number J16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM9324N
NS Package Number N16E
5
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9324/DM9324 5-Bit Comparator
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 9324FMQB
NS Package Number W16A
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with instructions for use provided in the labeling, can effectiveness.
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