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| DM74LS283 4-Bit Binary Adders with Fast Carry March 1998 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 (c) 1998 Fairchild Semiconductor Corporation DS006421 www.fairchildsemi.com Absolute Maximum Ratings (Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range 7V 7V DM54LS and 54LS DM74LS Storage Temperature Range -55C to +125C 0C to +70C -65C to +150C Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature -55 4.5 2 0.7 -0.4 4 125 0 DM54LS283 Nom 5 Max 5.5 Min 4.75 2 0.8 -0.4 8 70 DM74LS283 Nom 5 Max 5.25 V V V mA mA C Units 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 VI VOH Parameter Input Clamp Voltage High Level Output Voltage VOL Low Level Output Voltage Conditions 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 VI = 7V VCC = Max VI = 2.7V VCC = Max VI = 0.4V VCC = Max VCC = Max (Note 4) VCC = Max (Note 5) Min Typ (Note 2) -1.5 DM54 DM74 DM54 DM74 DM74 A, B C0 A, B C0 A, B C0 DM54 DM74 -20 -20 19 22 2.5 2.7 3.4 3.4 0.25 0.35 0.25 0.4 0.5 0.4 0.2 0.1 40 20 -0.8 -0.4 -100 -100 34 39 mA mA mA mA A mA V V V Max Units II IIH IIL IOS ICC1 ICC2 Input Current @ Max Input Voltage High Level Input Current Low Level Input Current Short Circuit Output Current Supply Current Supply Current Note 2: All typicals are at VCC = 5V, TA = 25C. 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 2 Switching Characteristics at VCC = 5V and TA = 25C From (Input) Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Parameter Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output To (Output) C0 to 1, 2 RL = 2 k CL = 15 pF Min Max 24 24 24 24 24 24 24 24 17 17 17 17 CL = 50 pF Min Max 28 30 28 30 28 30 28 30 24 25 24 26 ns ns ns ns ns ns ns ns ns ns ns ns Units C0 to 1, 2 C0 to 3 C0 to 3 C0 to 4 C0 to 4 Ai or Bi to i Ai or Bi to i C0 to 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 Fairchild Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com 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 www.fairchildsemi.com 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. |
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