DM74LS283 4-Bit Binary Adders with Fast Carry General Description These full adders perform the addition of two 4-bit binary numbers. The sum (∑) 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 look-ahead 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. n Systems achieve partial look-ahead performance with the economy of ripple carry n Typical add times Two 8-bit words 25 ns Two 16-bit words 45 ns n Typical power dissipation per 4-bit adder 95 mW n Alternate Military/Aerospace device (54LS283) is available. Contact a Fairchild Semiconductor Sales Office/Distributor for specifications. Features n Full-carry look-ahead across the four bits Connection Diagram Dual-In-Line Package DS006421-1 Order Number 54LS283DMQB, 54LS283FMQB, 54LS283LMQB, DM54LS283J, DM54LS283W, DM74LS283M or DM74LS283N See Package Number E20A, J16A, M16A, N16E or W16A © 1998 Fairchild Semiconductor Corporation DS006421 www.fairchildsemi.com DM74LS283 4-Bit Binary Adders with Fast Carry March 1998 Absolute Maximum Ratings (Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range DM54LS and 54LS DM74LS Storage Temperature Range 7V 7V −55˚C to +125˚C 0˚C to +70˚C −65˚C to +150˚C Recommended Operating Conditions Symbol Parameter DM54LS283 DM74LS283 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 V IOH High Level Output Current −0.4 −0.4 mA IOL Low Level Output Current 8 mA TA Free Air Operating Temperature 70 ˚C 2 2 V 4 −55 125 V 0 Note 1: 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. Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ Max Units −1.5 V (Note 2) VI Input Clamp Voltage VOH High Level Output Voltage VOL Low Level Output Voltage Input Current @ Max II Input Voltage IIH High Level Input Current IIL Low Level Input Current IOS Short Circuit VCC = Min, II = −18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max Supply Current ICC2 Supply Current 2.5 DM74 2.7 V 3.4 DM54 0.25 0.4 DM74 0.35 0.5 DM74 0.25 0.4 A, B 0.2 C0 0.1 A, B 40 VI = 2.7V VCC = Max C0 20 A, B −0.8 VI = 0.4V VCC = Max C0 −0.4 DM54 −20 −100 DM74 −20 −100 VCC = Max (Note 4) VCC = Max (Note 5) Note 2: All typicals are at VCC = 5V, TA = 25˚C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 4: 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 5: ICC2 is measured with all outputs open and all inputs grounded. www.fairchildsemi.com 3.4 VI = 7V VCC = Max Output Current ICC1 DM54 2 V mA µA mA mA 19 34 mA 22 39 mA Switching Characteristics at VCC = 5V and TA = 25˚C RL = 2 kΩ From (Input) Symbol Parameter CL = 15 pF To (Output) Min tPLH Propagation Delay Time Low to High Level Output tPHL Propagation Delay Time High to Low Level Output tPLH Propagation Delay Time Low to High Level Output tPHL Propagation Delay Time High to Low Level Output tPLH Propagation Delay Time Low to High Level Output tPHL Propagation Delay Time High to Low Level Output tPLH Propagation Delay Time Low to High Level Output tPHL tPLH Propagation Delay Time tPLH C0 to Propagation Delay Time Propagation Delay Time High to Low Level Output 24 28 ns 24 30 ns 24 28 ns 24 30 ns 24 28 ns 24 30 ns 24 28 ns 24 30 ns 17 24 ns 17 25 ns 17 24 ns 17 26 ns ∑3 C0 to ∑3 C0 to ∑4 C0 to ∑4 Ai or Bi to ∑i Ai or Bi C0 to Low to High Level Output tPHL C0 to Propagation Delay Time High to Low Level Output Units Max ∑ 1, ∑ 2 to ∑i Propagation Delay Time CL = 50 pF Min ∑ 1, ∑ 2 High to Low Level Output Low to High Level Output tPHL C0 to Max C4 C0 to C4 Ai or Bi to C4 Ai or Bi to C4 3 www.fairchildsemi.com Function Table DS006421-3 H = High Level, L = Low Level Note 6: Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs ∑ 1 and ∑2 and the value of the internal carry C2. The values at C2, A3, B3, A4, and B4 are then used to determine outputs ∑3, ∑4, and C4. www.fairchildsemi.com 4 Logic Diagram LS283 DS006421-2 5 www.fairchildsemi.com Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Leadless Chip Carrier Package (E) Order Number 54LS283LMQB Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS283DMQB or DM54LS283J Package Number J16A www.fairchildsemi.com 6 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Molded Package (M) Order Number DM74LS283M Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS283N Package Number N16E 7 www.fairchildsemi.com DM74LS283 4-Bit Binary Adders with Fast Carry Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS283FMQB or DM54LS283W Package Number W16A LIFE SUPPORT POLICY FAIRCHILD’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 FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and (c) whose device or system, or to affect its safety or effectiveness. failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. Fairchild Semiconductor Corporation Americas Customer Response Center Tel: 1-888-522-5372 www.fairchildsemi.com Fairchild Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 8 141-35-0 English Tel: +44 (0) 1 793-85-68-56 Italy Tel: +39 (0) 2 57 5631 Fairchild Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: +852 2737-7200 Fax: +852 2314-0061 National Semiconductor Japan Ltd. Tel: 81-3-5620-6175 Fax: 81-3-5620-6179 Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.