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2 / 10 page HCF4555B 2/10 IINPUT EQUIVALENT CIRCUIT PIN DESCRIPTION TRUTH TABLE X : Don’t Care FUNCTIONAL DIAGRAM PIN No SYMBOL NAME AND FUNCTION 2, 3 A, B Select Inputs (1/2 of dual) 1E Enable Input (1/2 of dual) 4, 5, 6, 7 Q0 to Q3 Outputs (1/2 of dual) 14, 13 A, B Select Inputs (1/2 of dual) 15 E Enable Input (1/2 of dual) 12, 11, 10, 9 Q0 to Q3 Outputs (1/2 of dual) 8 VSS Negative Supply Voltage 16 VDD Positive Supply Voltage INPUTS ENABLE SELECT OUTPUTS E B A Q3 Q2 Q1 Q0 LLL LLL H L L H L LHL LHL LHL L L H H H LLL H X X LLLL |
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