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{{Note|Unlike analog and mixed-mode circuits that are excited using voltage or current sources, digital circuits require "'''Digital Input Ports'''" , which can only take either binary or hexadecimal data.}} Â {{Note|In analog and mixed-mode circuits, you measure node voltages and device currents. In digital circuits, you probe only binary or hexadecimal data at "'''Digital Output Ports'''".}}
Digital input and output ports are generic and virtual parts. You can get them from the "'''Digital I/O'''" submenu of the "'''Parts Menu'''". Or you can easily place them in your circuit by typing the keyboard shortcut {{key|N}} for '''Digital Input''' and the keyboard shortcut {{key|O}} for '''Digital Output'''. Similar to all other parts or devices, digital input and output ports have property dialogs that can be accessed by double-clicking on them. By default, the digital input and output takes 1-bit binary data in decimal format (rather then hexadecimal). The keyboard shortcut for the NAND gate is {{key|Alt+A}}, and keyboard shortcut for the inverter gate is {{key|Alt+O}}.