HCF40110B

3/10

TRUTH TABLES

X : Don’t Care

* : Typically 100 ns between clock-up and clock-down positive transitions are required to ensure proper counting

LOGIC DIAGRAM

CLOCK

UP*

CLOCK

DOWN*

LATCH

ENABLE

TOGGLE

ENABLE

RESET

COUNTER

DISPLAY

X

L

L

L

Increments by 1

Follows Counter

X

L

L

L

Decrements by 1

Follows Counter

X

X

L

No Change

No Change

XXXX

H

Goes to 00000

Follow Counter (Display = 0)

X

X

X

H

L

Inhibited

Remains Fixed

X

H

L

L

Increments by 1

Remains Fixed

X

H

L

L

Decrements by 1

Remains Fixed