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HCC4089BF Datasheet(PDF) 8 Page - STMicroelectronics |
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HCC4089BF Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 13 page 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 8/13 |
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