74LS139 is two 2-wire 4-wiredecoderThere are 54/74S139 and 54/74LS139 line structures.It can decode 2-bit high bit addresses to generate 4Chip Select , up to 4 chips can be connected externally.
Select through end (G1) asLow level, the address end (A, B)Binary encodingTranslate at a low level at a corresponding output terminal.If the strobe terminal (G1) is used as the data input terminal, 139 can alsoData distributor。
