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M74HC191 数据表(PDF) 2 Page - STMicroelectronics |
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M74HC191 数据表(HTML) 2 Page - STMicroelectronics |
2 / 14 page INPUT AND OUTPUT EQUIVALENT CIRCUIT TRUTH TABLE INPUTS OUTPUS FUNCTION LOAD ENABLE D/U CLOCK QA QB QC QD L X X X a b c d PRESET DATA H L L UP COUNT UP COUNT H L H DOWN COUNT DOWN COUNT H H X NO CHANGE NO COUNT H X X NO CHANGE NO COUNT X: Don’t Care a - d: The level of steady state inputs at inputs a through D respectively PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 3, 2, 6, 7 QA to QD Flip-Flop Outputs 4 ENABLE Count Enable Input (Active LOW) 5 U/D Parallel Data Input 11 LOAD Load Input (Active LOW) 12 MA/MI OUT Terminal Count Output 13 RC Ripple Clock Output (Active LOW) 14 CLOCK Cloack Input (LOW to HIGH, Edge-triggered) 15, 1, 10, 9 DA to DD Data Inputs 8 GND Ground (0V) 16 VCC Positive Supply Voltage IEC LOGIC SYMBOL (HC191) IEC LOGIC SYMBOL (HC190) M54/M74HC190/191 2/14 |
类似零件编号 - M74HC191 |
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类似说明 - M74HC191 |
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