I came across this question in my homework:
Implement the following gates using only one TTL IC: one inverter, one 2-input NAND and one 3-input NAND.
The type of IC they're talking about has 14 pins, where pins 7 and 14 are GND and Vcc respectively. Also, the rest of the pins are the in/outputs of 4 gates of the same type.
This example is given:
Using only one TTL IC (OR gates) to implement a 4-input OR gate.
So far, I can only figure out the following:
- The gates inside the IC should be NAND.
- 1 NAND gate can be used to make the inverter:
- 1 NAND gate as the 2-input NAND (obviously).
- 3 NAND gates can be used as the 3-input NAND:
However, there are not enough NAND gates inside the IC for all of this. How do I fit them all?