How do you denote an integrated circuit in a TPC schematic?

The correct choice for denoting an integrated circuit in a TPC schematic is a rectangular symbol with pins on either side. This representation is standard in electrical schematics to indicate an integrated circuit, which typically contains multiple interconnected components functioning as a single unit. The rectangular shape allows for clear visualization of the IC's footprint, and the pins signify the various input and output connections that the IC has with other components in the circuit.

In contrast, the other symbols mentioned do not accurately represent an integrated circuit's characteristics. For instance, a circle with internal connections typically indicates a discrete component or a particular type of connection rather than an integrated circuit. A square with arrows indicating flow might represent a different type of device, such as a switch or logic gate, rather than an IC. Similarly, a circular symbol with multiple outputs could suggest a specific type of component but lacks the conventional association with an integrated circuit's design and layout. Thus, the rectangular symbol with pins accurately captures the essential features and functional role of integrated circuits in schematics.