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.
0
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1answer
23 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 ...
-2
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3answers
68 views
Determination of read/write lifespans of NAND drives
I check around and there are various numbers for different manufacturers solid state drives as read and write life terms. At the very fundamental level input/output speeds of these devices are pretty ...
1
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1answer
55 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 ...
0
votes
1answer
34 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 ...
0
votes
3answers
37 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....
0
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1answer
32 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. ...
2
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0answers
67 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 ...
0
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1answer
152 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 ...
0
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0answers
28 views
stm32 nand readback error
I'm using a NUCLEO-L496ZG-P board together with a Samsung K9F1G08U0E nand module. At the moment i'm testing read write operations. For certain values what i read from page differs from what i've ...
0
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2answers
537 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 ...
-4
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1answer
121 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
0
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2answers
96 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 ...
0
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2answers
127 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 ...
1
vote
1answer
334 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 ...
0
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1answer
49 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
0
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0answers
42 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 ...
0
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2answers
149 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:
...
0
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1answer
38 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 ...
8
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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?
0
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1answer
236 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 ...
0
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2answers
137 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 ...
0
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1answer
58 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 ...
1
vote
1answer
59 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 ...
0
votes
1answer
82 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 ...
0
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2answers
485 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.
1
vote
2answers
202 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 ...
0
votes
1answer
54 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 ...
0
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0answers
77 views
how to mathmatically write simplification of karnaugh map? (and nand)
i was asked to simplify \$F(w,x,y,z)=\sum(2,4,5,7,10,12,13,15)\$ into SOP and POS forms.
so i did the calculation and obtained:
\$y=bc'+bd+b'cd'\$ (boolean expression)
pos:
spc C'.D' C'.D C.D C....
1
vote
1answer
135 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 ...
2
votes
3answers
327 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 ...
0
votes
1answer
479 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
...
1
vote
1answer
2k 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 ...
0
votes
1answer
404 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 ...
0
votes
1answer
104 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.
...
0
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1answer
6k 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 ...
1
vote
5answers
770 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. ...
1
vote
1answer
72 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 ...
0
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1answer
65 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?
-1
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2answers
379 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 ...
-3
votes
2answers
282 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 ...
4
votes
3answers
327 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 ...
0
votes
0answers
80 views
There is some mitigation against Nand Mirroring, decapsulation and chemical (wet) etching, fault injection and microprobing techniques?
I read some pdf articles on Dr. Sergei Skorobogatov here
And while NAND flash memory manufacturers have so far managed to prevent the release of any documentation on how they actually work, it's ...
0
votes
3answers
413 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 ...
0
votes
1answer
117 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 ...
2
votes
1answer
672 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 ...
-1
votes
1answer
5k 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
1
vote
0answers
253 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 ...
3
votes
3answers
259 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 ...
-1
votes
1answer
212 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 ...
-1
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3answers
2k 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 ...
