AB

1

N

When the loop stabilies rate R2 = rate R3, thus fclock (

.

) = fclock (

.

) therefore N = A.B.

16 16

16 16

APPLICATION NOTES

For words of more than 4 bits, HCC/HCF4089B devices may be cascaded in two different modes : an Add

mode and a Multiply mode.

Two HCC/HCF4089B’s cascaded in the ”Add” mode with a preset number of 189.

Nota :

In the Add mode some of the gaps left by the more

significant unit at the count of 15 are filled in by the

less significant units. For example, when two units

are cascaded in the Add mode and programmed to

11 and 13, respectively, the more significant unit will

have 11 output pulses for every 16 input pulses and

the other unit will have 13 output pulses for every

256 input pulses for a total of

11

13

189

+=

16

256

256

Two HCC/HCF4089B’s cascaded in the Multiply mode for Multiplication of two variables A and B with loop

circuit control.

HCC/HCF4089B

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