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M74HC192 数据表(PDF) 2 Page - STMicroelectronics |
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M74HC192 数据表(HTML) 2 Page - STMicroelectronics |
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2 / 14 page  M74HC192 2/14 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION TRUTH TABLE X : Don’t Care PIN No SYMBOL NAME AND FUNCTION 3, 2, 6, 7 QA to QD Flip-Flop Outputs 4 COUNT DOWN Count Down Clock Input 5 COUNT UP Count Up Clock Input 11 LOAD Asynchronous Parallel Load Input (Active LOW) 12 CARRY Count Up (Carry) Output (Active LOW) 13 BORROW Count Down (Borrow) Output (Active LOW) 14 CLEAR Asynchronous Reset Input (Active High) 15, 1, 10, 9 A to D Data Inputs 8 GND Ground (0V) 16 Vcc Positive Supply Voltage COUNT UP COUNT DOWN LOAD CLEAR FUNCTION H H L COUNT UP H H L NO COUNT H H L COUNT DOWN H H L NO COUNT X X L L PRESET X X X H RESET |
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