![]() The chip is described as a hex buffer (or hex driver), because there are six independent channels, and the logic function is that each output gives a continuous copy of its input. There’s power (nominal 5 V) and ground, and then six input-output pairs, for a total of 14 pins. This is a schematic symbol for the SN7407N, showing the pinout. ![]() We’ll discuss what it means to have “open collector” outputs, and show some of the different ways that they are used. In what follows, we’ll work with the SN7407N, which is one of the most basic ICs with open-collector outputs. ![]() ![]() Open-collector outputs form the basis of a number of clever tricks for level-shifting and interfacing between different types of logic, and from logic to other types of electronic circuits. If you’ve played with chips like these, you’ve probably also come across chips with “open collector” outputs. One of the joys of working with basic digital electronics– and logic gate ICs in particular –is that it almost works like building with a set of Lego blocks: One output goes here, which connects to the next input here, and so forth until it does what you wanted. ![]()
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