54LS42,DM54LS42,DM74LS42 54LS42 DM54LS42 DM74LS42 BCD to Decimal Decoders Literature Number: SNOS309A 54LS42/DM54LS42/DM74LS42 BCD/Decimal Decoders General Description Features These BCD-to-decimal decoders consist of eight inverters and ten, four-input NAND gates. The inverters are connected in pairs to make BCD input data available for decoding by the NAND gates. Full decoding of input logic ensures that all outputs remain off for all invalid (10–15) input conditions. Y Connection Diagram Function Table Y Y Diode clamped inputs Also for applications as 4-line-to-16-line decoders; 3line-to-8-line decoders All outputs are high for invalid input conditions Alternate Military/Aerospace device (54LS42) is available. Contact a National Semiconductor Sales Office/ Distributor for specifications. Dual-In-Line Package No. BCD Inputs C 0 1 2 3 4 L L L L L L L L L H 5 6 7 8 9 L L L H H H H H L L Decimal Outputs B A 0 1 2 L L H H L L H L H L L H H H H H L H H H H H H H H H H H H H H H H H H H L H H H H H H H H L H H H H H H H H L H H H H H 3 4 5 6 7 8 9 L H H L L H L H L H H H H H H H H H H H et D e Y bs ol H H H L H H H H H H H H H H H H H H H H TL/F/6365 – 1 Order Number 54LS42DMQB, 54LS42FMQB, DM54LS42J, DM54LS42W, DM74LS42M or DM74LS42N See NS Package Number J16A, M16A, N16E or W16A I N V A L I D H H H H H H L L H H H H H H L L H H L H L H L H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H L H H H H L H H H H L H H H H L H H H H H H H H H H H H H H H H H H H H H H H H H e High Level L e Low Level O Logic Diagram TL/F/6365 – 2 C1995 National Semiconductor Corporation TL/F/6365 RRD-B30M105/Printed in U. S. A. 54LS42/DM54LS42/DM74LS42 BCD/Decimal Decoders 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 DM54LS42 Parameter Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage IOH High Level Output Current IOL Low Level Output Current TA Free Air Operating Temperature Electrical Characteristics Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 2 2 0.7 b 0.4 4 b 55 125 0 0.8 V b 0.4 mA 8 mA 70 §C over recommended operating free air temperature range (unless otherwise noted) Parameter Conditions Min Typ (Note 1) Max Units b 1.5 V 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 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 V V bs ol Symbol Units Nom e VCC DM74LS42 Min et Symbol DM54 2.5 3.4 DM74 2.7 3.4 V V 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 0.4 mA IOS Short Circuit Output Current VCC e Max (Note 2) Supply Current VCC e Max (Note 3) O II ICC 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 and all inputs grounded. 2 0.1 7 13 mA mA mA Switching Characteristics at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load) RL e 2 kX Symbol Parameter From (Input) To (Output) CL e 15 pF Min Max CL e 50 pF Min Units Max Propagation Delay Time High to Low Level Output A, B, C, or D (2 Levels of Logic) to Output 25 30 ns tPHL Propagation Delay Time High to Low Level Output A, B, C, or D (3 Levels of Logic) to Output 30 35 ns tPLH Propagation Delay Time Low to High Level Output A, B, C, or D (2 Levels of Logic) to Output 25 30 ns tPLH Propagation Delay Time Low to High Level Output A, B, C, or D (3 Levels of Logic) to Output 30 35 ns O bs ol et e tPHL 3 e Physical Dimensions inches (millimeters) O bs ol et 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS42DMQB or DM54LS42J NS Package Number J16A 4 e Physical Dimensions inches (millimeters) (Continued) O bs ol et 16-Lead Small Outline Molded Package (M) Order Number DM74LS42M NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS42N NS Package Number N16E 5 e et 16-Lead Ceramic Flat Package (W) Order Number 54LS42FMQB or DM54LS42W NS Package Number W16A bs ol 54LS42/DM54LS42/DM74LS42 BCD/Decimal Decoders Physical Dimensions inches (millimeters) (Continued) LIFE SUPPORT POLICY O 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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