TRUTH TABLE

COMPARING INPUTS

CASCADING INPUTS

OUTPUTS

A>B

A<B

A=B

A>B

A<B

A=B

A3>B3

X

X

X

X

X

X

H

L

L

A3=B3

A2>B2

X

X

X

X

X

H

L

L

A3=B3

A2=B2

A1>B1

X

X

X

X

H

L

L

A3=B3

A2=B2

A1=B1

A0>B0

X

X

X

H

L

L

A3=B3

A2=B2

A1=B1

A0=B0

LL

L

H

H

L

XXH

L

L

H

LH

L

L

H

L

HL

L

H

L

L

H

H

LLL

L

A3=B3

A2=B2

A1=B1

A0<B0

X

X

X

L

H

L

A3=B3

A2=B2

A1<B1

X

X

X

X

L

H

L

A3=B3

A2<B2

X

X

X

X

X

L

H

L

A3<B3

X

X

X

X

X

X

L

H

L

X: DON’T CARE

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

Supply Voltage

-0.5 to +7

V

DC Input Voltage

V

DC Output Voltage

V

DC Input Diode Current

± 20

mA

DC Output Diode Current

± 20

mA

DC Output Source Sink Current Per Output Pin

± 25

mA

± 50

mA

Power Dissipation

500 (*)

mW

Storage Temperature

-65 to +150

Lead Temperature (10 sec)

300

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

(*) 500 mW:

M54/M74HC85

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