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M74HC190RM13TR Arkusz danych(PDF) 2 Page - STMicroelectronics |
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2 / 14 page M74HC190 2/14 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION TRUTH TABLE X : Don’t Care a - d : The level of steady state inputs a through d respectively PIN No SYMBOL NAME AND FUNCTION 3, 2, 6, 7 QA to QD Flip-Flop Outputs 4 ENABLE Count Enable Input (Active LOW) 5 D/U Parallel Data Input 11 LOAD Load Input (Active LOW) 12 MAX/MIN Terminal Count Output 13 RCO Ripple Clock Output (Active LOW) 14 CLOCK Clock Input (LOW to HIGH, edge triggered) 15, 1, 10, 9 DATA A to D Data Inputs 8 GND Ground (0V) 16 Vcc Positive Supply Voltage INPUTS OUTPUTS FUNCTION LOAD ENABLE D/U CLOCK QAQBQCQD 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 |
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