74283 TTL 4位二进制全加器.pdf

© 2000 Fairchild Semiconductor CorporationDSAugust 1986Revised March 2000DM74LS283 4-Bit Binary Adder with Fast CarryDM74LS283 4-Bit Binary Adder with Fast CarryGeneral DescriptionThese 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.FeaturesI Full-carry look-ahead across the four bitsI Systems achieve partial look-ahead performance with the economy of ripple carryI Typical add timesTwo 8-bit words 25 nsTwo 16-bit words 45 nsI Typical power dissipation per 4-bit adder 95 mWOrdering Code:Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.Connection DiagramOrder NumberPackage NumberPackage DescriptionDM74LS283MM16A16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 NarrowDM74LS283NN16E16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 W2DM74LS283Function TableH = HIGH Level, L = LOW LevelInput 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.Logic DDM74LS283Absolute Maximum Ratings(Note 1)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 tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.Recommended Operating ConditionsElectrical Characteristics over recommended operating free air temperature range (unless otherwise noted)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.Supply Voltage7VInput Voltage7VOperating Free Air Temperature Range0°C to +70°CStorage Temperature Range−65°C to +150°CSymbolParameterMinNomMaxUnitsVCCSupply Voltage4.7555.25VVIHHIGH Level Input Voltage2VVILLOW Level Input Voltage0.8VIOHHIGH Level Output Current−0.4mAIOLLOW Level Output Current8mATAFree Air Operating Temperature070°CSymbolParameterConditionsMinTypMaxUnits(Note 2)VIInput Clamp VoltageVCC = Min, II = −18 mA−1.5VVOHHIGH Level VCC = Min, IOH = Max2.73.4VOutput VoltageVIL = Max, VIH = MinVOLLOW Level VCC = Min, IOL = Max0.350.5Output VoltageVIL = Max, VIH = MinVIOL = 4 mA, VCC = Min0.250.4IIInput Current @ MaxVCC = MaxA, B0.2mAInput VoltageVI = 7VC00.1IIHHIGH Level VCC = MaxA, B40µAInput CurrentVI = 2.7VC020IILLOW Level VCC = MaxA, B−0.8mAInput CurrentVI = 0.4VC0−0.4IOSShort Circuit Output CurrentVCC = Max−20−100mAICC1Supply CurrentVCC = Max (Note 4)1934mAICC2Supply CurrentVCC = Max (Note 5)2239mA4DM74LS283Switching Characteristics at VCC = 5V and TA = 25°C From (Input)RL = 2 kΩSymbolParameterTo (Output)CL = 15 pFCL = 50 pFUnitsMinMaxMinMaxtPLHPropagation Delay TimeC0 to ∑1, ∑22428nsLOW-to-HIGH Level OutputtPHLPropagation Delay TimeC0 to ∑1, ∑22430nsHIGH-to-LOW Level OutputtPLHPropagation Delay TimeC0 to ∑32428nsLOW-to-HIGH Level OutputtPHLPropagation Delay TimeC0 to ∑32430nsHIGH-to-LOW Level OutputtPLHPropagation Delay TimeC0 to ∑42428nsLOW-to-HIGH Level OutputtPHLPropagation Delay TimeC0 to ∑42430nsHIGH-to-LOW Level OutputtPLHPropagation Delay TimeAi or Bi to ∑i2428nsLOW-to-HIGH Level OutputtPHLPropagation Delay TimeAi or Bi to ∑i2430nsHIGH-to-LOW Level OutputtPLHPropagation Delay TimeC0 to C41724nsLOW-to-HIGH Level OutputtPHLPropagation Delay TimeC0 to C41725nsHIGH-to-LOW Level OutputtPLHPropagation Delay TimeAi or Bi to C41724nsLOW-to-HIGH Level OutputtPHLPropagation Delay TimeAi or Bi to C41726nsHIGH-to-LOW Level ODM74LS283Physical Dimensions inches (millimeters) unless otherwise noted16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A6DM74LS283 4-Bit Binary Adder with Fast CarryPhysical Dimensions inches (millimeters) unless otherwise noted (Continued)16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N16EFairchild does not assume any responsibility for use of any circuitry described, no circuit pate。