Dual 2-Line to 4-Line Decoders/Demultiplexers - National Semiconductor
Description
54LS155 DM54LS155 DM74LS155 54LS156 DM54LS156 DM74LS156 Dual 2-Line to 4-Line Decoders Demultiplexers
June 1989
54LS155 DM54LS155 DM74LS155 54LS156 DM54LS156 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 section The individual strobes permit activating or inhibiting each of the 4-bit sections as desired Data applied to input C1 is inverted at its outputs and data applied at C2 is true through its outputs The inverter following the C1 data input permits use as a 3-to-8-line decoder or 1-to-8-line demultiplexer without external gating Input clamping diodes are provided on these circuits to minimize transmission-line effects and simplify system design
Features
Y
Y
Y Y
Y
Applications Dual 2-to-4-line decoder Dual 1-to-4-line demultiplexer 3-to-8-line decoder 1-to-8-line demultiplexer Individual strobes simplify cascading for decoding or demultiplexing larger words Input clamping diodes simplify system design Choice of outputs Totem-pole (LS155) Open-collector (LS156) Alternate Military Aerospace device (54LS155 156) is available Contact a National Semiconductor Sales Office Distributor for specifications
Connection Diagram and Function Tables
Dual-In-Line Package Order Number 54LS155DMQB 54LS155FMQB 54LS155LMQB DM54LS155J DM54LS155W DM74LS155M DM74LS155N 54LS156DMQB 54LS156FMQB DM54LS156J DM54LS156W DM74LS156M or DM74LS156N See NS Package Number E20A J16A M16A N16E or W16A
2-Line-to-4-Line Decoder or 1-Line-to-4-Line Demultiplexer Inputs Select B X L L H H X A X L H L H X Strobe G1 H L L L L X Inputs (5) (6) (7) Select B X L L H H X A X L H L H X Strobe G2 H L L L L X Data C2 X L L L L H 2Y0 H L H H H H 2Y1 H H L H H H 2Y2 H H H L ...
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