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M54HC194 Datasheet(PDF) 2 Page - STMicroelectronics |
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M54HC194 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 12 page INPUT AND OUTPUT EQUIVALENT CIRCUIT TRUTH TABLE INPUTS OUTPUS CLEAR MODE CLOCK SERIAL PARALLEL QA QB QC QD S1 S0 LEFT RIGHT ABCD L X X X X X XXXX L L L L H X X X X XXXX QA0 QB0 QC0 QD0 H H H X X abc d a b c d H L H X H XXXX H QAn QBn QCn H L H X L XXXX L QAn QBn QCn H H L H X XXXX QBn QCn QDn H H H L L X XXXX QBn QCn QDn L H L L X X X XXXX QA0 QB0 QC0 QD0 X: Don’t Care : Don’t Care a ~ d : The level of steady state input voltage at input A ~ D respactively QA0 ~ QD0 : No change QAn ~ QDn : The level of QA, QB, QC, respectively, before the mst recent positive transition of the clock. PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1 CLEAR Asynchronous Reset Input (Active LOW) 2 SR Serial Data Input (Shift Right) 3, 4, 5, 6 A to D Parallel Data Input 7 SL Serial Data Input (Shift Left) 9, 10 S0, S1 Mode Control Inputs 11 CLOCK Clock Input (LOW to HIGH Edge-triggered) 15, 14, 13, 12 QA to QD Paralle Outputs 8 GND Ground (0V) 16 VCC Positive Supply Voltage IEC LOGIC SYMBOL M54/M74HC194 2/12 |
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