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74AC163M 데이터시트(PDF) 2 Page - STMicroelectronics |
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2 / 12 page INPUT AND OUTPUT EQUIVALENT CIRCUIT LOGIC DIAGRAMS PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCT ION 1 CLEAR Master Reset 2 CLOCK Clock Input (LOW-to-HIGH, Edge- Triggered) 3, 4, 5, 6 A, B, C, D Data Inputs 7 ENABLE P Count Enable Input 10 ENABLE T Count Enable Carry Input 9 LOAD Parallel Enable Input 14, 13, 12, 11 QA to QD Flip-Flop Outpus 10 ENABLE T Count Enable Carry Input 8 GND Ground (0V) 16 VCC Positive Supply Voltage TRUTH TABLE INPUTS OUTPUT S FUNCT ION CLR LD PE T E CK QAQBQCQD L X X X LLLL 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 X X X X NO CHANGE NO COUNT NOTE: X:Don’t Care A,B, C,D: Logic level of data input CARRY=TE • QA• QB• QC • QD 74AC163 2/12 |
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