LOGIC DIAGRAM (continued)

DISPLAY SEGMENTS

Ouptut Low (sink) Current Characterisitcs.

TRUTH TABLE

CLOCK UP*

CLOCK

DOWN*

LATCH

ENABLE

TOGGLE

ENABLE

RESET

COUNTER

DISPLAY

X

0

0

0

Increments by 1

Follows Counter

X

0

0

0

Decrement by 1

Follows Counter

X

X

0

No Change

No Change

X

X

X

X

1

Goes to 00000

Follows Counter

(Display = 0 )

X

X

X

1

0

Inhibited

Remains Fixed

X

1

0

0

Increments by 1

Remains Fixed

X

1

0

0

Decrement by 1

Remains Fixed

x = Don’t care 1 = High State 2 = Low State

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

HCC/HCF40110B

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