DM9324 5-Bit Comparator
October 1988
Revised February 2000
DM9324
5-Bit Comparator
General Description
The DM9324 expandable comparators provide comparison
between two 5-bit words and give three outputs—“less
than”, “greater than” and “equal to”. A HIGH on the active
LOW Enable Input forces all three outputs LOW.
Ordering Code:
Order Number
DM9324N
Package Number
N16E
Package Description
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Logic Symbol
Connection Diagram
V
CC
=
Pin 16
GND
=
Pin 6
Pin Descriptions
Pin Names
E
A0–A4
B0–B4
A
<
B
A
>
B
A
=
B
Description
Enable Input (Active LOW)
Word A Parallel Inputs
Word B Parallel Inputs
A Less than B Output (Active HIGH)
A Greater than B Output (Active HIGH)
A Equal to B Output (Active HIGH)
Truth Table
Inputs
E
H
L
L
L
A
n
X
B
n
X
A
<
B
L
L
L
H
Outputs
A
>
B
L
L
H
L
A
=
B
L
H
L
L
Word A
=
Word B
Word A
>
Word B
Word B
>
Word A
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
© 2000 Fairchild Semiconductor Corporation
DS009792
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DM9324
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 decod-
ing 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
>
B output from one device into an A input on
another device and the A
<
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
>
B output will be HIGH regardless of all other
inputs except E.
Logic Diagram
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DM9324
Absolute Maximum Ratings
(Note 1)
Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
7V
5.5V
0°C to
+70°C
−65°C
to
+150°C
Note 1:
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 tables 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
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Parameter
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
0
Min
4.75
2
0.8
−0.8
16
70
Nom
5
Max
5.25
Units
V
V
V
mA
mA
°C
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol
V
I
V
OH
V
OL
I
I
I
IH
I
IL
I
OS
I
CC
Parameter
Input Clamp Voltage
HIGH Level
Output Voltage
LOW Level
Output Voltage
Input Current @ Max Input Voltage
HIGH Level Input Current
LOW Level Input Current
Short Circuit Output Current
Supply Current
Conditions
V
CC
=
Min, I
I
= −12
mA
V
CC
=
Min, I
OH
=
Max
V
IL
=
Max
V
CC
=
Min, I
OL
=
Max
V
IH
=
Min
V
CC
=
Max, V
I
=
5.5V
V
CC
=
Max, V
I
=
2.4V
V
CC
=
Max, V
I
=
0.4V
V
CC
=
Max (Note 3)
V
CC
=
Max
−20
2.4
3.4
0.2
0.4
1
80
−3.2
−70
81
Min
Typ
(Note 2)
Max
−1.5
Units
V
V
V
mA
µA
mA
mA
mA
Note 2:
All typicals are at V
CC
=
5V, T
A
=
25°C.
Note 3:
Not more than one output should be shorted at a time.
Switching Characteristics
V
CC
= +
5.0V, T
A
= +25°C
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay
E to A
=
B
Propagation Delay
A
n
, B
n
to A
>
B
Propagation Delay
A
n
, B
n
to A
<
B
Propagation Delay
A
n
, B
n
to A
=
B
Parameter
C
L
=
15 pF
Min
Max
14
14
25
22
26
21
30
32
Units
ns
ns
ns
ns
3
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DM9324 5-Bit Comparator
Physical Dimensions
inches (millimeters) unless otherwise noted
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N16E
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’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 FAIRCHILD
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 (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
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2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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