54LS155/DM54LS155/DM74LS155, 54LS156/DM54LS156/DM74LS156 Dual 2-Line to 4-Line Decoders/Demultiplexers General Description Features 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. 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 TL/F/6395 – 1 3-Line-to-8-Line Decoder or 1-Line-to-8-Line Demultiplexer Inputs C² B A X L L L L H H H H X L L H H L L H H X L H L H L H L H G³ H L L L L L L L L (1) (2) (3) (4) A G1 C1 1Y0 1Y1 1Y2 1Y3 X L L H H X X L H L H X H L L L L X X H H H H L H L H H H H H H L H H H H H H L H H H H H H L H Inputs (5) (6) (7) 2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3 H L H H H H H H H H H L H H H H H H H H H L H H H H H H H H H L H H H H H H H H H L H H H Data B Outputs Strobe Select (0) Or Data Outputs Strobe H H H H H H L H H H H H H H H H L H H H H H H H H H L Select Outputs Strobe Data B A G2 C2 2Y0 2Y1 2Y2 2Y3 X L L H H X X L H L H X H L L L L X X L L L L H H L H H H H H H L H H H H H H L H H H H H H L H ² C e inputs C1 and C2 connected together ³ G e inputs G1 and G2 connected together H e high level, L e low level, X e don’t care C1995 National Semiconductor Corporation TL/F/6395 RRD-B30M105/Printed in U. S. A. 54LS155/DM54LS155/DM74LS155, 54LS156/DM54LS156/DM74LS156 Dual 2-Line to 4-Line Decoders/Demultiplexers June 1989 Absolute Maximum Ratings (Note) 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. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range b 55§ C to a 125§ C DM54LS and 54LS DM74LS 0§ C to a 70§ C Storage Temperature Range b 65§ C to a 150§ C Recommended Operating Conditions Symbol DM54LS155 Parameter VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage VOH High Level Output Current IOL Low Level Output Current TA Free Air Operating Temperature DM74LS155 Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 V 0.7 0.8 V b 0.4 b 0.4 mA 2 2 V 4 b 55 125 0 8 mA 70 §C Max Units b 1.5 V ’LS155 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ (Note 1) VI Input Clamp Voltage VCC e Min, II e b18 mA VOH High Level Output Voltage VCC e Min, IOH e Max VIL e Max, VIH e Min DM54 2.5 3.4 DM74 2.7 3.4 Low Level Output Voltage VCC e Min, IOL e Max VIL e Max, VIH e Min DM54 0.25 0.4 DM74 0.35 0.5 IOL e 4 mA, VCC e Min DM74 0.25 0.4 VOL II Input Current @ Max Input Voltage VCC e Max, VI e 7V IIH High Level Input Current IIL IOS ICC V V 0.1 mA VCC e Max, VI e 2.7V 20 mA Low Level Input Current VCC e Max, VI e 0.4V b 0.36 mA Short Circuit Output Current VCC e Max (Note 2) Supply Current VCC e Max (Note 3) DM54 b 20 b 100 DM74 b 20 b 100 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, and the duration should not exceed one second. Note 3: ICC is measured with all outputs open, A,B, and C1 inputs at 4.5V, and C2, G1, and G2 inputs grounded. 2 6.1 10 mA mA ’LS155 Switching Characteristics at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load) Symbol RL e 2 kX From (Input) To (Output) Parameter CL e 15 pF Min CL e 50 pF Max Min Units Max tPLH Propagation Delay Time Low to High Level Output A, B, C2, G1 or G2 to Y 18 22 ns tPHL Propagation Delay Time High to Low Level Output A, B, C2, G1 or G2 to Y 27 35 ns tPLH Propagation Delay Time Low to High Level Output A or B to Y 18 24 ns tPHL Propagation Delay Time High to Low Level Output A or B to Y 27 35 ns tPLH Propagation Delay Time Low to High Level Output C1 to Y 20 24 ns tPHL Propagation Delay Time High to Low Level Output C1 to Y 27 35 ns Recommended Operating Conditions Symbol DM54LS156 Parameter DM74LS156 Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage 0.7 0.8 VOH High Level Output Voltage 5.5 5.5 V IOL Low Level Output Current 4 8 mA TA Free Air Operating Temperature 70 §C Max Units b 1.5 V 100 mA 2 2 b 55 125 V V 0 V ’LS156 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI Parameter Conditions Min Typ (Note 1) Input Clamp Voltage VCC e Min, II e b18 mA ICEX High Level Output Current VCC e Min, VO e 5.5V VIL e Max, VIH e Min VOL Low Level Output Voltage VCC e Min, IOL e Max VIL e Max, VIH e Min DM54 0.25 0.4 DM74 0.35 0.5 IOL e 4 mA, VCC e Min DM74 0.25 0.4 V II Input Current @ Max Input Voltage VCC e Max, VI e 7V IIH High Level Input Current VCC e Max, VI e 2.7V 20 mA IIL Low Level Input Current VCC e Max, VI e 0.4V b 0.36 mA ICC Supply Current VCC e Max (Note 2) 10 mA Note 1: All typicals are at VCC e 5V, TA e 25§ C. Note 2: ICC is measured with all outputs open, A, B, and C1 inputs at 4.5V, and C2, G1, and G2 grounded. 3 0.1 6.1 mA ’LS156 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 2 kX CL e 15 pF Min Max CL e 50 pF Min Units Max tPLH Propagation Delay Time Low to High Level Output A, B, C2, G1 or G2 to Y 28 53 ns tPHL Propagation Delay Time High to Low Level Output A, B, C2, G1 or G2 to Y 33 43 ns tPLH Propagation Delay Time Low to High Level Output A or B to Y 28 53 ns tPHL Propagation Delay Time High to Low Level Output A or B to Y 33 43 ns tPLH Propagation Delay Time Low to High Level Output C1 to Y 28 53 ns tPHL Propagation Delay Time High to Low Level Output C1 to Y 34 43 ns Logic Diagram TL/F/6395 – 2 4 5 Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier (E) Order Number 54LS155LMQB NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS155DMQB, 54LS156DMQB, DM54LS155J or DM54LS156J NS Package Number J16A 6 Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) Order Number DM74LS155M or DM74LS156M NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS155N or DM74LS156N NS Package Number N16E 7 54LS155/DM54LS155/DM74LS155, 54LS156/DM54LS156/DM74LS156 Dual 2-Line to 4-Line Decoders/Demultiplexers Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS155FMQB, 54LS156FMQB, DM54LS155W or DM54LS156W NS Package Number W16A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. 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