© 2000 Fairchild Semiconductor Corporation DS009792 www .fairchildsemi.com
October 1988
Revised February 2000
DM9324 5-Bit Comparator
DM9324
5-Bit Comparator
General Descript ion
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:
Logic Symbol
VCC = Pin 16
GND = Pin 6
Pin Descriptions
Connection Diagram
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Order Number Package Number Package Description
DM9324N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Pin Names Description
EEnable Input (Active LOW)
A0–A4 Word A Parallel Inputs
B0–B4 Word B Parallel Inputs
A < B A Less than B Output (Active HIGH)
A > B A Greater than B Output (Active HIGH)
A = B A Equal to B Output (Active HIGH)
Inputs Outputs
EAnBnA < BA > B A = B
HX X LL L
LWord A = Word B L L H
LWord A > Word B L H L
LWord B > Word A H L L
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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 gen erated in onl y three gate dela ys. 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).
Ty i n g t he A > B output from one de vice into an A input on
another device and the A < B output into the corresponding
B in put 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 rega rdless of all other
inputs ex cept E.
Logic Diagram
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DM9324
Absolute Maximum Ratings(Note 1) Note 1: The “Absolut e Maximum R atings” are th ose values bey ond 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 “Re comm ended Operat ing Co ndition s” table will de fine the cond itions
for actu al device operation.
Recommended Operating Conditions
Electri cal Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: N ot m ore than one output sh ould be sh orted at a tim e.
Switching Characteristics
VCC = +5.0V, TA = +25°C
Supply Voltage 7V
Input Voltage 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range 65°C to +150°C
Symbol Parameter Min Nom Max Units
VCC Supply Voltage 4.75 5 5.25 V
VIH HIGH Level Input Voltage 2 V
VIL LOW Level Input Voltage 0.8 V
IOH HIGH Level Output Current 0.8 mA
IOL LOW Level Output Current 16 mA
TAFree Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min Typ Max Units
(Note 2)
VIInput Clamp Voltage VCC = Min, II = 12 mA 1.5 V
VOH HIGH Level VCC = Min, IOH = Max 2.4 3.4 V
Output Voltage VIL = Max
VOL LOW Level VCC = Min, IOL = Max 0.2 0.4 V
Output Voltage VIH = Min
IIInput Current @ Max Input Voltage VCC = Max, VI = 5.5V 1 mA
IIH HIGH Level Input Current VCC = Max, VI = 2.4V 80 µA
IIL LOW Level Input Current VCC = Max, VI = 0.4V 3.2 mA
IOS Short Circuit Output Current VCC = Max (Note 3) 20 70 mA
ICC Supply Current VCC = Max 81 mA
Symbol Parameter CL = 15 pF Units
Min Max
tPLH Propagation Delay 14 ns
tPHL E to A = B 14
tPLH Propagation Delay 25 ns
tPHL An, Bn to A > B 22
tPLH Propagation Delay 26 ns
tPHL An, Bn to A < B 21
tPLH Propagation Delay 30 ns
tPHL An, Bn to A = B 32
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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 no t assume any responsibility for use of any circuitry de scribed, no circuit patent licenses ar e 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 suppor t de vices o r systems a re devices or syste ms
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.
2. A critical compon ent i n any compon ent of a life su pport
device or system whose failure to perform can be rea-
sonabl y ex pect ed to ca use the fa i lure of the life su pp ort
device or system, or to affect its safety or effectiveness.
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