Fairchild Semiconductor DM9324N Datasheet

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 Package Number Package Description

DM9324N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

DM9324 5-Bit Comparator

Logic Symbol

VCC = Pin 16
GND = Pin 6

Pin Descriptions

Pin Names Description

E
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)

Enable Input (Active LOW)

Connection Diagram

Truth Table

Inputs Outputs

A

E

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

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial

n

B

A < BA > B A = B

n

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Functional Description

The ’24 5-bit comparators use combinational circuitry to

directly generate “A greater than B” and “A less than B”

DM9324

outputs. As evident from the logic diagram, these outputs
are generated in on ly three gate dela ys. The “A equals B”
output is generated in one additional gate delay by decod­ing the “A neither less than nor greater th an B” condition
with a NOR gate. All three outputs are activated by the
active LOW Enable Input (E

).

Logic Diagram

Tyi n g t he 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

.

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