Logic Gates

Logic gate definitions

class schemdraw.logic.logic.And(*d, inputs: int = 2, nand: bool = False, inputnots: Optional[Sequence[int]] = None, **kwargs)

AND gate

Parameters

• inputs – Number of inputs to gate.

• nand – Draw invert bubble on output

• inputnots – Input numbers (starting at 1) of inputs that have invert bubble

Anchors:

out in[X] - for each input

class schemdraw.logic.logic.Buf(*d, **kwargs)

Buffer

Anchors:

in out

class schemdraw.logic.logic.Not(*d, **kwargs)

Not gate/inverter

Anchors:

in out

class schemdraw.logic.logic.NotNot(*d, **kwargs)

Double inverter

Anchors:

in out

class schemdraw.logic.logic.Or(*d, inputs: int = 2, nor: bool = False, xor: bool = False, inputnots: Optional[Sequence[int]] = None, **kwargs)

OR or XOR gate element.

Parameters

• inputs – Number of inputs to gate.

• nor – Draw invert bubble on output

• xor – Draw as exclusive-or gate

• inputnots – Input numbers (starting at 1) of inputs that have invert bubble

Anchors:

out in[X] - for each input

class schemdraw.logic.logic.Schmitt(*d, **kwargs)

Schmitt Trigger

Anchors:

in out

class schemdraw.logic.logic.SchmittAnd(*d, **kwargs)

Schmitt Trigger AND

Anchors:

in1 in2 out

class schemdraw.logic.logic.SchmittNot(*d, **kwargs)

Inverted Schmitt Trigger

Anchors:

in out

class schemdraw.logic.logic.Tgate(*d, **kwargs)

Transmission gate.

Anchors:

in out c cbar

logic_parser.logicparse(gateW: float = 2, gateH: float = 0.75, outlabel: Optional[str] = None) → schemdraw.schemdraw.Drawing

Parse a logic string expression and draw the gates in a schemdraw Drawing

Logic expression is defined by string using ‘and’, ‘or’, ‘not’, etc. for example, “a or (b and c)”. Parser recognizes several symbols and names for logic functions: [and, ‘&’, ‘∧’] [or, ‘|’, ‘∨’, ‘+’] [xor, ‘⊕’, ‘⊻’] [not, ‘~’, ‘¬’]

Parameters

• expr – Logic expression

• gateH – Height of one gate

• gateW – Width of one gate

• outlabel – Label for logic output

Returns

schemdraw.Drawing with logic tree