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54AC169L Scheda tecnica(PDF) 2 Page - National Semiconductor (TI) |
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54AC169L Scheda tecnica(HTML) 2 Page - National Semiconductor (TI) |
2 / 10 page Connection Diagrams Logic Diagram Functional Description The ’AC/’ACT169 uses edge-triggered J-K-type flip-flops and have no constraints on changing the control or data in- put signals in either state of the Clock. The only requirement is that the various inputs attain the desired state at least a setup time before the rising edge of the clock and remain valid for the recommended hold time thereafter. The parallel load operation takes precedence over the other operations, as indicated in the Mode Select Table. When PE is LOW, the data on the P 0–P3 inputs enters the flip-flops on the next ris- ing edge of the Clock. In order for counting to occur, both CEP and CET must be LOW and PE must be HIGH; the U/D input then determines the direction of counting. The Terminal Count (TC) output is normally HIGH and goes LOW, pro- vided that CET is LOW, when a counter reaches zero in the Count Down mode or reaches 15 in the Count Up mode. The TC output state is not a function of the Count Enable Parallel (CEP) input level. If an illegal state occurs, the ’AC169 will return to the legitimate sequence within two counts. Since Pin Assignment for DIP and Flatpak DS100276-3 Pin Assignment for LCC DS100276-4 DS100276-5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com 2 |
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