![]() ![]() It is the time taken from applying the input to the output produced. It is the amount of noise voltage allowed at the input and it should not affect the output. It is the product of the voltage which is supplied and current needed to produce the output. Number of inputs and outputs connected to the gate, which does not affect the usual performance and does not degrade the voltage. Characteristics of TTL: Fan in and Fan out: To increase the number of inputs, the number of emitters at transistor Q1 is increased accordingly. I recently learned about the NAND gate circuit with transistors in my circuits class as shown below. Q3 and Q4 transistors together form the output. How does the NAND Gate work using Transistors. Transistor Q1 consists of 2 emitters, two inputs are given through this 2 emitters. ![]() It also consists of four resistors R1,R2,R3,R4 and a diode D. It consists of four transistors Q1,Q2, Q3 and Q4. This is the two input TTL NAND gate circuit. Internal Structure of 2 input NAND Gate TTL ![]() Internal structure and characteristics of standard TTL NAND gate:
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