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SN74HC139DR Arkusz danych(PDF) 2 Page - Texas Instruments |
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SN74HC139DR Arkusz danych(HTML) 2 Page - Texas Instruments |
2 / 22 page SN54HC139, SN74HC139 DUAL 2LINE TO 4LINE DECODERS/DEMULTIPLEXERS SCLS108D − DECEMBER 1982 − REVISED SEPTEMBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) The ’HC139 devices comprise two individual 2-line to 4-line decoders in a single package. The active-low enable (G) input can be used as a data line in demultiplexing applications. These decoders/demultiplexers feature fully buffered inputs, each of which represents only one normalized load to its driving circuit. FUNCTION TABLE INPUTS OUTPUTS G SELECT OUTPUTS G B A Y0 Y1 Y2 Y3 H X X H H H H L L LL HH H L L HH LH H L H LH HLH L H H H H H L logic diagram (positive logic) 1G 1Y0 1Y1 1Y2 1Y3 2Y0 2Y1 2Y2 2Y3 1A 1B 2G 2A 2B Pin numbers shown are for the D, DB, J, N, NS, PW, and W packages. 1 2 3 15 14 13 4 5 6 7 12 11 10 9 |
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