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SN54LS83AN Datasheet(PDF) 2 Page - Motorola, Inc |
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SN54LS83AN Datasheet(HTML) 2 Page - Motorola, Inc |
2 / 3 page 5-82 FAST AND LS TTL DATA SN54/74LS83A FUNCTIONAL DESCRIPTION The 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) outputs. C0 + (A1+B1)+2(A2+B2)+4(A3+B3)+8(A4+B4) = ∑1+2∑2+4∑3+8∑4+16C4 Where: (+) = plus Due to the symmetry of the binary add function the LS83A can 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 Input can not be left open, but must be held LOW when no carry in is intended. Example: C0 A1 A2 A3 A4 B1 B2 B3 B4 ∑1 ∑2 ∑3 ∑4 C4 Logic Levels L L H L H H L L H H H L L H Active HIGH 0 0 1 0 1 1 0 0 1 1 1 0 0 1 (10+9 = 19) Active LOW 1 1 0 1 0 0 1 1 0 0 0 1 1 0 (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, etc. FUNCTIONAL TRUTH TABLE C (n–1) An Bn ∑n Cn L L L L L L L H H L L H L H L L H H L H H L L H L H L H L H H H L L H H H H H H C1 — C3 are generated internally C0 — is an external input C4 — is an output generated internally GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 74 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 74 – 55 0 25 25 125 70 °C IOH Output Current — High 54, 74 – 0.4 mA IOL Output Current — Low 54 74 4.0 8.0 mA |
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