DM9324 - Fairchild Semiconductor

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

www.fairchildsemi.com 2

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

3 www.fairchildsemi.com

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

www.fairchildsemi.com 4

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.