CD74HC139M PDF 데이터시트 검색

S E M I C O N D U C T O R CD74HC139, CD74HCT139 High Speed CMOS Logic Dual 2-to-4 Line Decoder, Demultiplexer Description The Harris CD74HC139, CD74HCT139 contain two independent binary to one of four decoders each with a single active low enable input (1E or 2E). Data on the select inputs (1A0 and 1A1 or 2A0 and 2A1) cause one of the four normally high outputs to go low. If the enable input is high all four outputs remain high. For demultiplexer operation the enable input is the data input. Th