Integrated Circuits¶

The schemdraw.elements.intcircuits.Ic class is used to make integrated circuits, multiplexers, and other black box elements. The schemdraw.elements.intcircuits.IcPin class is used to define each input/output pin before adding it to the Ic.

All pins will be given an anchor name of inXY where X is the side (L, R, T, B), and Y is the pin number along that side. Pins also define anchors based on the name parameter. If the anchorname parameter is provided for the pin, this name will be used, so that the pin name can be any string even if it cannot be used as a Python variable name.

Here, a J-K flip flop, as part of an HC7476 integrated circuit, is drawn with input names and pin numbers.

JK = elm.Ic(pins=[elm.IcPin(name='>', pin='1', side='left'),
                  elm.IcPin(name='K', pin='16', side='left'),
                  elm.IcPin(name='J', pin='4', side='left'),
                  elm.IcPin(name=r'$\overline{Q}$', pin='14', side='right', anchorname='QBAR'),
                  elm.IcPin(name='Q', pin='15', side='right')],
            edgepadW = .5,  # Make it a bit wider
            pinspacing=1).label('HC7476', 'bottom', fontsize=12)
display(JK)

Notice the use of $overline{Q}$ to acheive the label on the inverting output. The anchor positions can be accessed using attributes, such as JK.Q for the non-inverting output. However, inverting output is named $overline{Q}, which is not accessible using the typical dot notation. It could be accessed using getattr(JK, r’$overline{Q}$’), but to avoid this an alternative anchorname of QBAR was defined.

Multiplexers¶

Multiplexers and demultiplexers are drawn with the schemdraw.elements.intcircuits.Multiplexer class which wraps the Ic class.

elm.Multiplexer(
    pins=[elm.IcPin(name='C', side='L'),
          elm.IcPin(name='B', side='L'),
          elm.IcPin(name='A', side='L'),
          elm.IcPin(name='Q', side='R'),
          elm.IcPin(name='T', side='B', invert=True)],
    edgepadH=-.5)

See the Circuit Gallery for more examples.

Seven-Segment Display¶

A seven-segment display, in schemdraw.elements.intcircuits.SevenSegment, provides a single digit with several options including decimal point and common anode or common cathode mode. The schemdraw.elements.intcircuits.sevensegdigit() method generates a list of Segment objects that can be used to add a digit to another element, for example to make a multi-digit display.

DIP Integrated Circuits¶

Integrated circuits can be drawn in dual-inline package style with schemdraw.elements.intcircuits.IcDIP. Anchors allow connecting elements externally to show the IC in a circuit, or interanally to show the internal configuration of the IC (see 741 Opamp, DIP Layout.)