Logic gate - nand gate, Other Engineering

NAND Gate;

When constructing a NAND gate using transistors as the switching devices, the output often represents the 'inversion' of the "AND" gate. Figure 4 shows an example of a 2 input digital gate consisting of two NPN transistors, TR1 and TR2, which are assumed to be perfect switches. In a positive logic system, when input A and input B are both at the 0 state (0v), both transistors are biased OFF and the output will adopt the 1 state (+ 5v). If input A only is now given the 1 state, transistor TR1 is biased ON but no collector current can flow as TR2 is still OFF. Similarly, if input B only is given the 1 state then transistor TR2 is biased ON but again no current can flow as TR1 is OFF. Only when both input A and input B are at the 1 state together, with both transistors ON, will current be allowed to flow taking the output to the 0 state.

33_nand gate.png

Posted Date: 9/13/2012 9:05:11 AM | Location : United States

Related Discussions:- Logic gate - nand gate, Assignment Help, Ask Question on Logic gate - nand gate, Get Answer, Expert's Help, Logic gate - nand gate Discussions

Write discussion on Logic gate - nand gate
Your posts are moderated
Related Questions
Interest Rate Calculations In considering the time value of money, it is convenient to represent mathematically the relationship between the current or present value of a sing

hardness of bore well water is less than sea water

Q. Write short note on laminating.                                                 OR    Explain the Laminating processes.

Q. What are the limitations of the powder metallurgy process ? How are some of these overcome ? Ans. Limitations : 1. Dies and equipment costs are high. So, the process

In this assignment you are asked to demonstrate your understanding of both exploratory and statistical inference techniques described in class to investigate how the currency marke

Fire alarm systems: Fire alarm systems can be very complex and it is usually not possible for an enforcing officer to check all the cabling, the components, the software and t