74LS155 PDF File ( Datasheet )

DUAL 1-OF-4 DECODER, DEMULTIPLEXER The SN54 , 74LS155 and SN54 , 74LS156 are high speed Dual 1-of-4 Decoder, Demultiplexers. These devices have two decoders with common 2-bit Address inputs and separate gated Enable inputs. Decoder “a” has an Enable gate with one active HIGH and one active LOW input. Decoder “b” has two active LOW Enable inputs. If the Enable functions are satisfied, one output of each decoder will be LOW as selected by the address inputs. The LS156 has open collector

DM74LS155 DM74LS156 Dual 2-Line to 4-Line Decoders, Demultiplexers August 1986 Revised April 2000 DM74LS155 DM74LS156 Dual 2-Line to 4-Line Decoders, Demultiplexers General Description These TTL circuits feature dual 1-line-to-4-line demultiplexers with individual strobes and common binary-address inputs in a single 16-pin package. When both sections are enabled by the strobes, the common address inputs sequentially select and route associated input data to the appropriate output of each sec