The chip was completed by designing and adhering the top metal layers that provided the interconnecting pathways to form logic gates (NAND, NOR, etc.). These final masking stages were less costly ...

One of the things that every student of digital electronics learns, is that every single logic function can be made from a combination of NAND gates ... has been a recent example, a modular ...

There are a range of integrated circuits that most of us would regard as definitive examples of their type ... 5400 and 7400 TTL quad 2-input NAND gate has been in continuous production since ...