Questions tagged [nand]

Use this tag when referring to any circuit that uses NAND gate / NAND logic, or for asking questions relating to NAND gates.

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64 views

NAND Simplified with xy + !x z

I've been trying to work on a few problems, though I'm not sure how to rewrite this a few circuits using only NAND/NOR --> an example is shown below; How am I able to rewrite only using NAND + NOR ...
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209 views

How can i make f(a,b,c) = \$A \cdot B \cdot \overline C + A \cdot \overline B\cdot C\$ using only XORs and NANDs?

i have this problem where i need to make the Logical Function represented by : f(A,B,C)= \$A \cdot B \cdot \overline C + A \cdot \overline B\cdot C\ \$ using only XORs and NANDs The function was as ...
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169 views

How to know the size (W/L) for a circuit to source or sink a minimum of 4 times as much current as a minimum sized conventional inverter?

Consider the tri-state NAND below (i.e. if EN is high, output is NAND of A&B; if EN low, output is floating. Assume EN and ~EN always track). Show work. a) Label each transistor with a size which ...
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3answers
116 views

Low voltage form a NAND logic gate then the state is high

I've been trying to learn how to use logic gates. I wanted to use logic gate to bump digital signal from 3.3V MCU to a 5V. I took a T74LS38D1 and mocked the solution using two switches connected to 3....
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1answer
43 views

Implementing a simple logic equation

I need to do a lab that seemed like it was simple, but for some reason i cant get the right output for this function. its G(0)= T1T3'+T5T7'. These are data inputs.. I can only use NAND and NOR gates. ...
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0answers
90 views

MOSFET burn down due to droping logic level voltage [duplicate]

I made 2 PCB, one is a logic driver with NAND Schmitt trigger (74HC132D & CD40106B) to drive FORWARD and BACKWARD of H-bridge channel, the other board is the H-bridge Power MOSFET, which used 4 P ...
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1answer
426 views

H-bridge MOSFET NAND gate driver suffered from logic voltage drop

I've tried to reproduce the NAND Schmitt triggers circuit to drive my H-bridge MOSFET as per following source: http://axotron.se/index_en.php?page=34&chapter=0 All my design files are at this ...
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2answers
4k views

How to extract data from an NAND chip with an NAND reader from iphone 6? [closed]

I am not an electrical engineer and I cannot take phones apart. I had an iphone 6 that suffered no water damage, no smashed screens, no dust... but suddenly it got an NAND memory issue. The phone ...
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1answer
304 views

TTL NAND logic circuit

how can find the maximum fan-out of the TTL-NAND gate using LTSpice ? i tried to solve problem by hand, but the problem how to find fan-out using ltspice
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2answers
138 views

CMOS NAND Image

I was looking at this image which shows a CMOS NAND standard cell. However, how can I see this depicts a NAND? A CMOS NAND has parallel PMOS and serial NMOS transistors but somehow I can't see this ...
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2answers
210 views

Momentary Switch NAND Latching IC Burning and (Possibly) Faulty Logic

Problem: My issue is that the momentary switch with NAND latching logic that I have designed is not functioning consistently. It does work as intended at first, but then fails to work after repeated ...
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1answer
2k views

Latching Press-on / hold-off toggle switch circuit. Works on breadboard not on PCB

I followed a schematic and mocked up a Latching toggle switch with NAND gates. (see picture below for what I followed) (Source) I have mocked it up onto a breadboard. Using the exact same values of ...
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1answer
62 views

How can i simulate this circuit to match with the truth table?

How can I simulate this NAND logic circuit to match the truth table?]2
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69 views

Writing unused areas of a page on a NAND flash

I'm working on a project based on the ESP32 that uses a NAND chip from the GD5F1 family (link to the datasheet). Sorry for the long question, but it's a bit convoluted, and it's driving me nuts for ...
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2answers
525 views

nand gate astable vibrator do not work at 400kHz

I want to build a 400kHz square wave oscillator with NAND GATE using the CD4011BE circuit. Unfortunately, it does not work as expected when I use R2 and C values according this schematic: ...
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1answer
81 views

Alternative for adder out of NAND-gates

Recently I was experimenting with the NAND-gate representation of an adder circuit and tried to implemenent it without crossing wires. So I got this: The carry is negated, but when chaining two of ...
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5answers
3k views

Is the NAND logic gate perfectly symmetrical?

In other words: if we swap A and B, will Q behave exactly the same in DC and transient analysis?
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1answer
4k views

Current and Voltage in CMOS Logic Gate

So, in the NAND gate below, I understand how it works with the p-type and n-type transistors. However, my question is what happens with the current when the output is connected to Vdd? If the voltage ...
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2answers
435 views

NAND flash retention using USB charger?

NAND-based digital flash data storage devices such as SD,SSD,USBstick,eMMC,UFS,etc. do have transistors, where the small amount of electrical charge does slowly leak over time, resulting into data ...
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1answer
154 views

NAND technology - ecc error

Nand technology has some issues, which I find it a bit difficult to understand. It is said in nand devices that manufacture guaranty that a page will have no more than X (4/8/16,etc according to nand ...
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1answer
99 views

Transforming logical circuit in NANDs and ORs [closed]

I can't transform this circuit in an exclusively NOR and another NAND circuit. Everytime I tryed to simulate both circuits, neither of them gave me the correct result. F=(notB)+AC English is not my ...
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1answer
119 views

Circuit design using only NANDs and Inverters

So I'm having trouble with some circuit design for class. We're given a truth table with 4 inputs and 2 outputs. I have karnaugh maps for the inputs and simplified my boolean expression. We have to ...
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2answers
1k views

How would I draw A'B' + B'D + A'CD using only NAND Gates?

I keep getting stuck when trying to draw this out. Mainly because the NAND Gates we are using are 2 inputs one output.
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2answers
407 views

Create a circuit with max 6 NAND gates

We need to make a logic circuit, the given function is: f= (AB) + (not(C)) + (not(A)D) I already tried a bit, and I can manage to make a circuit with 7 NAND gates but not with less... Could anyone ...
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1answer
68 views

Embedded External Flash Device using NAND architecture

Our SoC device supports both external NAND devices as well as Multi-IO/QSPI NOR devices. I can use either of them. Now, for NAND device, it will store only Program Code and Const Data. That means SoC ...
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1answer
238 views

AND/NAND LED Flasher circuit help?

I've come across a circuit I'm not too familiar with: (Goggle Drive version) How do I tune R1, R2, R3, and C1 to adjust frequency and duty cycle? I get the general idea of how it works, but I've ...
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3answers
434 views

CD74HCT03E NAND Gate dont work

First of all I am new to this whole circuit building thing so please don't be too harsh on me. I recently tried to build my first adder with NAND gates. So I went to a shop and bought some CD74HCT03E ...
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1answer
2k views

nand gates inverter

There are 2 ways to use 2 input nand gates as a inverter. I know one of them, which is make 2 inputs connected to one input signal. simulate this circuit – Schematic created using CircuitLab ...
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1answer
4k views

Bitwise shift operation from NAND?

I'm building an 8-bit computer using the Ben Eater's videos and I would like to improve the ALU, e.g. add nand bitwise operation because every logic gates can be built from this. But I ask myself if ...
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1answer
669 views

Equivalent circuit composed entirely in NAND gates

Summary / Instructions I was given this problem in a test paper: Take this circuit and make an equivalent one only with NAND gates. The problem I've tried, with multiple combinations but almost ...
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1answer
193 views

obsolete DTL chip substitution

I'm trying to substitute the obsolete NAND chip in this circuit (part of an audio synthesizer) with a standard CMOS one (for example CD4011). The original NAND chip is a DTL chip by Motorola, MC846. ...
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1answer
10k views

TTL NAND gate (totem pole) current and voltage analysis

I am working on a few practice problems for my course and I am unsure about my working throughout. hoping for some feedback and guidance from the community as it's not my strongest topic. Here is ...
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5answers
2k views

Purpose of resistors in a NAND gate

I'm trying to build some logic gates out of transistors to eventually be able to make a full adder circuit. I've tried building a NAND gate multiple times but I can't seem to be able to get it right. ...
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1answer
109 views

Logical effort and delay estimation

So as I have understood the logical effort for a 2 input nand gate with only one of the inputs active = 4/3. Furthermore the net logical effort is 8/3 (considering both the inputs). Now given that the ...
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1answer
98 views

Does repeated NAND flash erasing cause more wear?

That is repeatedly erasing pages without programming them. Or does it have to be a erase/program cycle to count?
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2answers
595 views

Nand gate for binary addition instead of XOR gate

i am a novice to electronics,actually i am java and android developer who doesn't know the very basic concepts of computing and trying to learn from ground level. i was checking out a video which ...
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2answers
431 views

Using only NAND and NOT gates to represent a logic function that isn't an SOP/POS?

I understand that I should repreatedly use deMorgan's theorem until I am left only with NAND/NOT gates. This is easy when the starting function is an SOP/POS. However when it isn't, I get confused as ...
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3answers
611 views

TTL NAND analog amplifier does not work in Multisim - why?

I have found in Dieter Nuhrmann's book an interesting approach to amplifier circuit and decided to test it. Unfortunately the Multisim simulation does not work as expected. The signal is not ...
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3answers
1k views

Implement AND gate multiple ways (positive & negative logic)

Could somebody explain to me how how negative and positive logic works? If I have an AND gate the truth table will be x y z 0 0 0 0 1 0 1 0 0 1 1 1 If I wanted ...
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1answer
199 views

Does the microcontroller need to support a given filesystem in USB Mass Storage Class scenario?

I've been thinking about designing a small flash drive of sorts with the AT32UC3A3256. I'm planning on using e.MMC managed NAND which I can hook up to the MCU without a problem. Just wondering does ...
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1answer
1k views

NAND Flash vs NAND EEPROM

I'm not clear how (if) NAND EEPROM (made by Toshiba) is different compared to regular NAND Flash memories (except is cheaper). We want to use with SAM9G device that is support NAND devices such as ...
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1answer
10k views

how can i build a 3-input OR gate using only 2-input NAND gates [closed]

How can i build the above circuit?I have to use the boolean algebra rules like de morgans law.I tried already to simplify the equation,but nothing correct yet
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0answers
1k views

How to make a multi emitter BJT transistor? [duplicate]

Im trying to create the 74XX series IC's from scratch, using just transistors, resistors and diodes. I intend to chain them together and create some logic systems. Right now i'm trying to create a ...
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3answers
527 views

NAND with LED not working

ive been trying to create this small circuit but its not working. The truth table should be that of a NAND gate, but instead i get this: A|B|Q 0 0 1 1 0 1 0 1 0 1 1 0 I've put up the circuit in ...
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1answer
444 views

How to build PIPO register

Ive got problem with simulating 8-bit register. Ive built register using eight D flip - flop. Every flip-flop was made with 5 NAND gates + 2 NAND gates for Preset. My problem is that register doesnt ...
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3answers
4k views

How do registers work in a CPU? [closed]

Im going to build simple 4-bit cpu using only NAND gates and I have a couple of questions. How actually register work in cpu? For example: PC points to load instruction and CPU should store some ...
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2answers
2k views

NAND gate with one pMOS and one nMOS

I have a question asking to draw a circuit for a NAND gate with one nMOS and one pMOS. The way the question is it sounds like it means only one of each. I know you can do that gate type with two nMOS ...
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1answer
3k views

Monostable out of NAND gates

For the diagram below, I can see that it functions as a monostable (I have built and tested it), but I can't really see why it works, I mean, I can see that there is an RC network, which a monostable ...
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3answers
36k views

Creating a logic circuit with only NAND gates

I am supposed to make a logic circuit with only NAND gates. I have created a truth table and i have extracted the boolean expression using a karnaugh map. My function is: \$\overline XZ + XY\$ How ...
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2answers
1k views

Logic Gate using Transistor and Diode not working on Proteus

Logic Gate using Transistor and Diode not working on Proteus, just show ON light different on MultiSims is always work as the Logic Gate's Schematic. For example Logic NOT : PROTEUS just Light "ON" ...