# Full adder

The full adder or a cascade of full adders can be used to add multi-digit binary numbers.

The full adder has the label FA and has three inputs and two outputs. The two inputs A and B represent the bits to be added. With the input CI (carry in), a previous carry can be included in the addition.

The output S (sum) represents the last digit of the sum and the output CO (carry out) represents the carry.

The circuit diagram TP1012_08_3_1.circ

shows a 4-bit full adder.

Truth table

A | B | CI | S | CO |
---|---|---|---|---|

0 | 0 | 0 | 0 | 0 |

0 | 1 | 0 | 1 | 0 |

1 | 0 | 0 | 1 | 0 |

1 | 1 | 0 | 0 | 1 |

0 | 0 | 1 | 1 | 0 |

0 | 1 | 1 | 0 | 1 |

1 | 0 | 1 | 0 | 1 |

1 | 1 | 1 | 1 | 1 |

Adjustable parameters

Designation | Range | Default value |
---|---|---|

Voltage level (lo) | 0.1 ... 24 V | 0.8 |

Voltage level (hi) | 0.1 ... 24 V | 2 |

Designation | Range | Default value |
---|---|---|

Voltage level (lo) | 0 ... 24 V | 0 |

Voltage level (hi) | 0.1 ... 24 V | 5 |

Resistance | 0.1 ... 1000 Ohm | 50 |