54LS283/DM54LS283/DM74LS283 4-Bit Binary Adders with Fast Carry General Description Features These full adders perform the addition of two 4-bit binary numbers. The sum (R) outputs are provided for each bit and the resultant carry (C4) is obtained from the fourth bit. These adders feature full internal look ahead across all four bits. This provides the system designer with partial lookahead performance at the economy and reduced package count of a ripple-carry implementation. The adder logic, including the carry, is implemented in its true form meaning that the end-around carry can be accomplished without the need for logic or level inversion. Y Y Y Y Y Full-carry look-ahead across the four bits Systems achieve partial look-ahead performance with the economy of ripple carry Typical add times Two 8-bit words 25 ns Two 16-bit words 45 ns Typical power dissipation per 4-bit adder 95 mW Alternate Military/Aerospace device (54LS283) is available. Contact a National Semiconductor Sales Office/ Distributor for specifications. Connection Diagram Dual-In-Line Package TL/F/6421 – 1 Order Number 54LS283DMQB, 54LS283FMQB, 54LS283LMQB, DM54LS283J, DM54LS283W, DM74LS283M or DM74LS283N See NS Package Number E20A, J16A, M16A, N16E or W16A C1995 National Semiconductor Corporation TL/F/6421 RRD-B30M105/Printed in U. S. A. 54LS283/DM54LS283/DM74LS283 4-Bit Binary Adders with Fast Carry 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 DM54LS283 Parameter VCC 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 DM74LS283 Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 2 2 V 0.7 0.8 V b 0.4 b 0.4 mA 8 mA 70 §C 4 b 55 V 125 0 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Min Typ (Note 1) DM54 2.5 3.4 DM74 2.7 3.4 Conditions 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 Input Current @ Max Input Voltage VCC e Max VI e 7V A, B 0.2 C0 0.1 High Level Input Current VCC e Max VI e 2.7V A, B 40 C0 20 Low Level Input Current VCC e Max VI e 0.4V Short Circuit Output Current VCC e Max (Note 2) ICC1 Supply Current VCC e Max (Note 3) 19 34 mA ICC2 Supply Current VCC e Max (Note 4) 22 39 mA VOL II IIH IIL IOS A, B b 0.8 C0 b 0.4 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: ICC1 is measured with all outputs open, all B inputs low and all other inputs at 4.5V, or all inputs at 4.5V. Note 4: ICC2 is measured with all outputs open and all inputs grounded. 2 V V mA mA mA mA Switching Characteristics at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter RL e 2 kX From (Input) To (Output) CL e 15 pF Min Max CL e 50 pF Min Units Max tPLH Propagation Delay Time Low to High Level Output C0 to R1, R2 24 28 ns tPHL Propagation Delay Time High to Low Level Output C0 to R1, R2 24 30 ns tPLH Propagation Delay Time Low to High Level Output C0 to R3 24 28 ns tPHL Propagation Delay Time High to Low Level Output C0 to R3 24 30 ns tPLH Propagation Delay Time Low to High Level Output C0 to R4 24 28 ns tPHL Propagation Delay Time High to Low Level Output C0 to R4 24 30 ns tPLH Propagation Delay Time Low to High Level Output Ai or Bi to Ri 24 28 ns tPHL Propagation Delay Time High to Low Level Output Ai or Bi to Ri 24 30 ns tPLH Propagation Delay Time Low to High Level Output C0 to C4 17 24 ns tPHL Propagation Delay Time High to Low Level Output C0 to C4 17 25 ns tPLH Propagation Delay Time Low to High Level Output Ai or Bi to C4 17 24 ns tPHL Propagation Delay Time High to Low Level Output Ai or Bi to C4 17 26 ns Function Table TL/F/6421 – 3 H e High Level, L e Low Level Note: Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs R1 and R2 and the value of the internal carry C2. The values at C2, A3, B3, A4, and B4 are then used to determine outputs R3, R4, and C4. 3 Logic Diagram LS283 TL/F/6421 – 2 4 5 Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) Order Number 54LS283LMQB NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS283DMQB or DM54LS283J NS Package Number J16A 6 Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) Order Number DM74LS283M NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS283N NS Package Number N16E 7 54LS283/DM54LS283/DM74LS283 4-Bit Binary Adders with Fast Carry Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS283FMQB or DM54LS283W 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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