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M74HC161B1R Datasheet(PDF) 2 Page - STMicroelectronics |
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M74HC161B1R Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 12 page M74HC161 2/12 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION TRUTH TABLE X : Don’t Care A, B, C, D : Logic level of data inputs Carry : CARRY = TE·QA·QB·QC·QD LOGIC DIAGRAM This logic diagram has not be used to estimate propagation delays PIN No SYMBOL NAME AND FUNCTION 1 CLEAR Asynchronous Master Reset 2 CLOCK Clock Input (LOW to HIGH, Edge-triggered) 3, 4, 5, 6 A, B, C, D Data Inputs 7 PE Count Enable Input 10 TE Count Enable Carry Input 9LOAD Parallel Enable Input 14, 13, 12, 11 QA to QD Flip Flop Outputs 15 CARRY Terminal Count Output 8 GND Ground (0V) 16 Vcc Positive Supply Voltage INPUTS OUTPUTS FUNCTION CLEAR LOAD PE TE CLOCK QA QB QC QD L X X X X L L L L RESET TO "0" H L X X A B C D PRESET DATA H H X L NO CHANGE NO COUNT H H L X NO CHANGE NO COUNT H H H H COUNT UP COUNT H X X X NO CHANGE NO COUNT |
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