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M54HC192 数据表(PDF) 2 Page - STMicroelectronics |
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M54HC192 数据表(HTML) 2 Page - STMicroelectronics |
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2 / 15 page  INPUT AND OUTPUT EQUIVALENT CIRCUIT TRUTH TABLE 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 X: Don’t Care PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 3, 2, 6, 7 QA to QD Flip-Flop Outputs 4CPD Count Down Clock Input 5CPU 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 DA to DD Data Inputs 8 GND Ground (0V) 16 VCC Positive Supply Voltage IEC LOGIC SYMBOL (HC193) IEC LOGIC SYMBOL (HC191) M54/M74HC192/193 2/15 |
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