SN54/74LS83A 4-BIT BINARY FULL ADDER WITH FAST CARRY

1 5-1 FAST AND LS TTL DATA4-BIT BINARY FULL ADDERWITH FAST CARRYThe SN54 / 74LS83A 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 LS83A operates with eitheractive HIGH or active LOW operands (positive or negative logic). TheSN54 / 74LS283 is recommended for new designs since it is identical infunction with this device and features standard corner power 4C4C0 GNDB1A1 1A4 3A3 2B2A2 CONNECTION DIAGRAM DIP (TOP VIEW)B3 VCCNOTE:The Flatpak version has thesame pinouts (ConnectionDiagram) as the Dual NAMESLOADING (Note a)HIGHLOWA1 A4B1 B4C0 1 4C4 Operand A InputsOperand B InputsCarry InputSum Outputs (Note b) CARRY Output (Note b) ( ) ( ).

2 A) 1 TTL Unit Load ( ) = 40 A mA ) The Output LOW drive factor is for Military (54) and 5 for Commercial (74)Temperature BINARY FULL ADDERWITH FAST CARRYLOW POWER SCHOTTKYJ SUFFIXCERAMICCASE 620-09N SUFFIXPLASTICCASE 648-08161161 ORDERING INFORMATIONSN54 LSXXJC eramicSN74 LSXXNP lasticSN74 LSXXDSOIC161D SUFFIXSOICCASE 751B-03 LOGIC SYMBOL10 11 8 7 3 4 1 1696215141314C0B1A2B2A3B3A4B4C4 1 2 3 4C4 LOGIC DIAGRAMVCC = PIN 5 GND = PIN 12 = PIN NUMBERSC1C2C3C0A1B1A2B2A3B3A4B4C4 1 2 3 4153410111612679138145-2 FAST AND LS TTL DATASN54/74LS83 AFUNCTIONAL DESCRIPTIONThe LS83A adds two 4-BIT BINARY words (A plus B) plus the incoming CARRY . The BINARY sum appears on the sum outputs ( 1 4)and outgoing CARRY (C4) + (A1+B1)+2(A2+B2)+4(A3+B3)+8(A4+B4) = 1+2 2+4 3+8 4+16C4 Where: (+) = plusDue to the symmetry of the BINARY add function the LS83A can be used with either all inputs and outputs active HIGH (positivelogic) or with all inputs and outputs active LOW (negative logic).

3 Note that with active HIGH Inputs, CARRY Input can not be left open,but must be held LOW when no CARRY in is :C0A1A2A3A4B1B2B3B4 1 2 3 4C4 Logic LevelsLLHLHHLLHHHLLHA ctive HIGH00101100111001(10+9 = 19)Active LOW11010011000110( CARRY +5+6 = 12)Interchanging inputs of equal weight does not affect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 10, 11,13, TRUTH TABLEC (n 1)AnBn nCnLLLLLLLHHLLHLHLLHHLHHLLHLHLHLHHHLLHHH HHHC1 C3 are generated internallyC0 is an external inputC4 is an output generated internallyGUARANTEED OPERATING RANGESS ymbolParameterMinTypMaxUnitVCCS upply Ambient Temperature Range5474 550252512570 CIOHO utput Current High54, 74 Current AND LS TTL DATASN54/74LS83 ADC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

4 SblPLimitsUiTCdi iSymbolParameterMinTypMaxUnitTest ConditionsVIHI nput HIGH Input HIGH Voltage forAll InputsVILI nput LOW Input LOW Voltage forVILI nput LOW InputsVIKI nput clamp Diode Voltage = MIN, IIN = 18 mAVOHIGH V l542535 VVMIN IMAX VVVOHO utput HIGH = MIN, IOH = MAX, VIN = VIHVOHO utput HIGH ,OH,INIH per Truth TableVOLO utput LOW Voltage54, = mAVCC = VCC MIN,VIN=VILor VIHVOLO utput LOW = mAVIN = VIL or VIHper Truth TableIIHI nput HIGH CurrentC0A or B2040 AVCC = MAX, VIN = VIIHC0A or = MAX, VIN = VIILI nput LOW CurrentC0A or B = MAX, VIN = VIOSO utput Short Circuit Current (Note 1) 20 100mAVCC = MAXICCP ower Supply CurrentAll Inputs GroundedAll Inputs at V, Except BAll Inputs at V393434mAVCC = MAXNote 1: Not more than one output should be shorted at a time, nor for more than 1 CHARACTERISTICS (TA = 25 C)SblPLimitsUiTCdi iSymbolParameterMinTypMaxUnitTest ConditionstPLHtPHLP ropagation Delay, C0 Inputto any Output16152424nsV50 VtPLHtPHLP ropagation Delay, Any A orB Input to Outputs15152424nsVCC = VCL=15pFtPLHtPHLP ropagation Delay, C0 Inputto C4 Output11151722nsCL = 15 pFFigures 1 and 2tPLHtPHLP ropagation Delay, Any A orB Input to C4 Output11121717nsFigure 1 Figure 2AC VtPHL