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74155 Dataheets PDF



Part Number 74155
Manufacturers National Semiconductor
Logo National Semiconductor
Description Dual 2-Line to 4-Line Decoders/Demultiplexers
Datasheet 74155 Datasheet74155 Datasheet (PDF)

DM54155 DM74155 Dual 2-Line to 4-Line Decoders Demultiplexers February 1993 DM54155 DM74155 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 pe.

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DM54155 DM74155 Dual 2-Line to 4-Line Decoders Demultiplexers February 1993 DM54155 DM74155 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 Applications Dual 2-to-4-line decoder Dual 1-to-4-line demultiplexer 3-to-8-line decoder 1-to-8-line demultiplexer Y Individual strobes simplify cascading for decoding or demultiplexing larger words Y Input clamping diodes simplify system design Connection Diagram and Function Tables Dual-In-Line Package Select BA XX LL LH HL HH XX 2-Line-to-4-Line Decoder or 1-Line-to-4-Line Demultiplexer Inputs Outputs Strobe Data G1 C1 1Y0 1Y1 1Y2 H X HHH L H LHH L H HLH L H HHL L H HHH X L HHH 1Y3 H H H H L H TL F 6549 – 1 Order Number DM54155J DM54155W or DM74155N See NS Package Number J16A N16A or W16A Inputs Outputs Select Strobe Data B A G2 C2 2Y0 2Y1 2Y2 2Y3 XX LL LH HL HH XX H L L L L X X HHHH L LHHH L HLHH L HHLH L HHHL H HHHH C e inputs C1 and C2 connected together G e inputs G1 and G2 connected together H e high level L e low level X e don’t care 3-Line-to-8-Line Decoder or 1-Line-to-8-Line Demultiplexer Inputs Outputs Select Strobe Or Data (0) (1) (2) (3) (4) (5) (6) (7) C B A G 2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3 X XX L LL L LH L HL L HH H LL H LH H HL H HH H L L L L L L L L HHHHHHHH L HHHHHHH H L HHHHHH HH L HHHHH HHH L HHHH HHHH L HHH HHHHH L HH HHHHHH L H HHHHHHH L C1995 National Semiconductor Corporation TL F 6549 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage 7V Input Voltage 5 5V Operating Free Air Temperature Range DM54 b55 C to a125 C DM74 0 C to a70 C Storage Temperature Range b65 C to a150 C Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed The device should not be operated at these limits The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA Parameter Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature Min 45 2 b55 DM54155 Nom 5 Max 55 08 b0 8 16 125 Min 4 75 2 0 DM74155 Nom 5 Max 5 25 08 b0 8 16 70 Units V V V mA mA C Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Typ Min (Note 1) VI VOH VOL II Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Input Current Max Input Voltage VCCeMin IIe b12 mA VCC e Min IOH e Max VIL e Max VIH e Min VCC e Min IOL e Max VIH e Min VIL e Max VCC e Max VIe 5 5V 24 IIH High Level Input Current VCC e Max VI e 2 4V IIL Low Level Input Current VCC e Max VI e 0 4V IOS Short Circuit Output Current VCC e Max (Note 2) DM54 DM74 b20 b18 ICC Supply Current VCC e Max (Note 3) DM54 DM74 Note 1 All typicals are at VCC e 5V TA e 25 C Note 2 Not more than one output should be shorted at a time Note 3 ICC is measured with the outputs open A B and C1 inputs at 4 5V and C2 G1 and G2 inputs grounded 25 25 Max b1 5 04 1 40 b1 6 b55 b55 35 40 Units V V V mA mA mA mA mA 2 Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter From (Input) To (Output) RL e 400X CL e 15 pF Min Max Units tPLH Propagation Delay Time Low to High Level Output A B C2 G1 or G2 to Y 20 ns tPHL Propagation Delay Time High to Low Level Output A B C2 G1 or G2 to Y 27 ns tPLH Propagation Delay Time Low to High Level Output A or B to Y 32 ns tPHL Propagation Delay Time High to Low Level Output A or B to Y 32 ns tPLH Propagation Delay Time Low to High Level Output C1 to Y 24 ns tPHL Propagation Delay Time High to Low Level Output C1 to Y 27 ns Logic Diagram TL F 6549 – 2 3 4 Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Packa.


54155 74155 DM54155


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