![]() ![]() For a 1 of 8 decoder, look at the 74138 and its variants. MC4513B does it in CMOS with active high outputs. The light-emitting element normally takes the form of a diode so electricity will only flow in one direction, keeping the individual "row" and "column" lines of the matrix electrically isolated from each other. 2 Assuming you are looking for a display decoder: How about a SN7447/8 Study the gate diagram in the datasheet to resolve your questions about the concepts involved. Instead, sub-units of the display (typically, rows or columns for a dot matrix display or individual characters for a character orientated display, occasionally individual display elements) are multiplexed, that is, driven one at a time, but the electronics and the persistence of vision combine to make the viewer believe the entire display is continuously active.In senven segment displays the various segments of each character are connected in a two-dimensional matrix and will only illuminate if both the "row" and "column" lines of the matrix are at the correct electrical potential. In the technique of multiplexing the entire display is not driven at one time. ![]()
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