SN74LS283D资料

4-BIT BINARY FULL ADDERWITH FAST CARRY

The SN54/74LS283 is a high-speed 4-Bit Binary Full Adder with internalcarry lookahead. It accepts two 4-bit binary words (A1–A4, B1–B4) and aCarry Input (C0). It generates the binary Sum outputs (∑1–∑4) and the CarryOutput (C4) from the most significant bit. The LS283 operates with either ac-tive HIGH or active LOW operands (positive or negative logic).

CONNECTION DIAGRAM DIP (TOP VIEW)

VCC16B315A314Σ313A412B411Σ410C49NOTE:

The Flatpak versionhas the same pinouts(Connection Diagram) asthe Dual In-Line Package.

1Σ22B23A24Σ15A16B17C08GNDPIN NAMES

A1–A4B1–B4C0

∑1–∑4C4

Operand A InputsOperand B InputsCarry Input

Sum Outputs (Note b)Carry Output (Note b)

LOADING (Note a)HIGH1.0 U.L.1.0 U.L.0.5 U.L.10 U.L.10 U.L.LOW0.5 U.L.0.5 U.L.0.25 U.L.5 (2.5) U.L.5 (2.5) U.L.NOTES:

a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.

b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial(74) Temperature Ranges.

FAST AND LS TTL DATA

5-1

元器件交易网www.cecb2b.comSN54/74LS283LOGIC DIAGRAMC07A15B16A23B22A314B315A412B411C1C2C34∑1VCC = PIN 16GND = PIN 8 = PIN NUMBERS∑21∑313∑4109C4FUNCTIONAL DESCRIPTIONThe LS283 adds two 4-bit binary words (A plus B) plus theincoming carry. The binary sum appears on the sum outputs(∑1–∑4) and outgoing carry (C4) outputs.C0 + (A1 + B1) + 2(A2 + B2) + 4(A3 + B3) + 8(A4 + B4) = ∑1 + 2 ∑2+ 4 ∑3 + 8 ∑4 + 16C4Where: (+) = plusExample:C0logic levelsActive HIGHActive LOWL01A1L01A2H10A3L01A4H10B1H10B2L01Due to the symmetry of the binary add function the LS283can be used with either all inputs and outputs active HIGH(positive logic) or with all inputs and outputs active LOW(negative logic). Note that with active HIGH inputs, Carry Inputcan not be left open, but must be held LOW when no carry in isintended.B3L01B4H10∑1H10∑2H10∑3L01∑4L01C4H10(10+9=19)(carry+5+6=12)Interchanging inputs of equal weight does not affect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 7, 5 or 3.FAST AND LS TTL DATA5-2元器件交易网www.cecb2b.comSN54/74LS283FUNCTIONAL TRUTH TABLEC (n–1)LLLLHHHHAnLLHHLLHHBnLHLHLHLH∑nLHHLHLLHCnLLLHLHHHC1–C3 are generated internallyC0 is an external inputC4 is an output generated internallyGUARANTEED OPERATING RANGESSymbolVCCTAIOHIOLSupply VoltageOperating Ambient Temperature RangeOutput Current — HighOutput Current — LowParameter5474547454, 745474Min4.54.75–550Typ5.05.02525Max5.55.2512570–0.44.08.0UnitV°CmAmADC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)LimitsSymbolVIHVILVIKVOHParameterInput HIGH VoltageInput LOW VoltageInput Clamp Diode VoltageOutput HIGH Voltage547454, 74VOLOutput LOW Voltage74C0IIHInput HIGH CurrentAny A or BC0Any A or BIILIOSICCInput LOW CurrentC0Any A or B–200.350.520400.10.2–0.4–0.8–1003439VµAµAmAmAmAmAmAmA2.52.75474–0.653.53.50.250.4Min2.00.70.8–1.5TypMaxUnitVVVVVVTest ConditionsGuaranteed Input HIGH Voltage forAll InputsGuaranteed Input LOW Voltage forAll InputsVCC = MIN, IIN = –18 mAVCC = MIN, IOH = MAX, VIN = VIHor VIL per Truth TableIOL = 4.0 mAIOL = 8.0 mAVCC = VCC MIN,VIN = VIL or VIHper Truth TableVCC = MAX, VIN = 2.7 VVCC = MAX, VIN = 7.0 VVCC = MAX, VIN = 0.4 VVCC = MAXVCC = MAXShort Circuit Current (Note 1)Power Supply CurrentTotal, Output HIGHTotal, Output LOWNote 1: Not more than one output should be shorted at a time, nor for more than 1 second.FAST AND LS TTL DATA5-3元器件交易网www.cecb2b.comSN54/74LS283AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)LimitsSymboltPLHtPHLtPLHtPHLtPLHtPHLtPLHtPHLParameterPropagation Delay, C0 Inputto Any Σ OutputPropagation Delay, Any A or B Inputto Σ OutputsPropagation Delay, C0 Inputto C4 OutputPropagation Delay, Any A or B Inputto C4 OutputMinTyp1615151511111112Max2424242417221717UnitnsnsnsnsTest ConditionsCL = 15 pFFigures 1 & 2AC WAVEFORMS1.3 VtPHLVOUT1.3 VVOUTtPLH1.3 VtPLH1.3 VtPHLVINVINFigure 1Figure 2FAST AND LS TTL DATA5-4