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2 / 12 page M74HC166 2/12 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION TRUTH TABLE X : Don’t Care a........h : The level of steady input voltage at inputs a through H respectively PIN No SYMBOL NAME AND FUNCTION 1 SI Serial Data Inputs 2, 3, 4, 5, 10, 11, 12, 14 A to H Parallel Data Inputs 6 CLOCK INH Clock Enable Input (Active Low) 7 CLOCK Clock Input (LOW to HIGH, Edge Triggered 9 CLEAR Asynchronous Master Reset Input (Active Low) 13 QH Serial Output from the Last Stage 15 SHIFT/LOAD Parallel Enable Input (Active Low) 8 GND Ground (0V) 16 Vcc Positive Supply Voltage INPUTS INTERNAL OUTPUTS OUTPUTS CLEAR SHIFT/ LOAD CLOCK INH CLOCK SERIAL IN PARALLEL A..........H QA QB QH L XXXXX L L L L X X X X NO CHANGE H L L X a..............h a b h H H L H X H QAn QGn H H L L X L QAn QGn H X H X X X NO CHANGE |
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