All About Circuits Forum Implementing a boolean function using a single 8:3 decoder and a single nand gate
 Register Blogs FAQ Members List Today's Posts Search Today's Posts Mark Forums Read

 Homework Help Stuck on a textbook question or coursework? Cramming for a test and need help understanding something? Post your questions and attempts here and let others help.

#1
10-20-2013, 12:59 PM
 dogadikbayir Junior Member Join Date: Oct 2013 Posts: 12
Implementing a boolean function using a single 8:3 decoder and a single nand gate

ok so I am asked to implement the following boolean function: F(w,x,y) with these minterms (0,2,3,5). I am allowed to use a single decoder(74138) and a single nand gate. I found the solution using De Morgan's laws of logic but it seems like I need inverters for the minterms 0,2,3,5. Please help me...

thank you...
#2
10-20-2013, 01:29 PM
 WBahn Senior Member Join Date: Apr 2012 Location: Larkspur, Colorado Posts: 7,166 Blog Entries: 8

As usual, you need to show YOUR attempt to solve YOUR homework problem. Then we can look at what you've done and where you need to go and make suggestions that will hopefully steer you down that path.
 The Following User Says Thank You to WBahn For This Useful Post: dogadikbayir (10-20-2013)
#3
10-20-2013, 02:15 PM
 dogadikbayir Junior Member Join Date: Oct 2013 Posts: 12

ok my solution is like this: I have one 3x8 decoder with bubbles on each output and 0,2,3,5 connected together to a single NAND gate. This is right I've tested it however the task is like this: "Implement F with a single decoder and a single NAND gate".
#4
10-20-2013, 04:05 PM
 ScottWang Senior Member Join Date: Aug 2012 Location: Taiwan,Asia (GMT +8) Posts: 1,077 Blog Entries: 2

The title ... using a single 8:3 decoder
But you using 74138, that is 3:8 decoder, does some mistake of the title?
#5
10-20-2013, 10:08 PM
 WBahn Senior Member Join Date: Apr 2012 Location: Larkspur, Colorado Posts: 7,166 Blog Entries: 8

Quote:
 Originally Posted by dogadikbayir ok my solution is like this: I have one 3x8 decoder with bubbles on each output and 0,2,3,5 connected together to a single NAND gate. This is right I've tested it however the task is like this: "Implement F with a single decoder and a single NAND gate".
You have the right idea. When you say that you've tested it, how did you test it? In simulation or with the real IC? If in simulation, did you use the model for the 74138 specifically, or just a generic 3:8 decoder?

Go look at the datasheet for the 74138 and I think you'll see your problem and how to fix it.
 The Following User Says Thank You to WBahn For This Useful Post: dogadikbayir (10-23-2013)

 Tags boolean, decoder, function, gate, implementing, nand, single

 Similar Threads Thread Thread Starter Forum Replies Last Post vol Homework Help 5 10-20-2013 08:13 PM mahmoud hassan Homework Help 2 02-21-2013 01:53 AM cazz0026 Homework Help 6 09-10-2012 12:51 AM mcc123pa Homework Help 3 12-06-2010 07:14 PM

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Electronics Forums     General Electronics Chat     The Projects Forum     Homework Help     Electronics Resources Software, Microcomputing, and Communications Forums     Programmer's Corner     Embedded Systems and Microcontrollers     Computing and Networks     Radio and Communications Circuits and Projects     The Completed Projects Collection Abstract Forums     Math     Physics     General Science All About Circuits Commmunity Forums     Off-Topic     The Flea Market     Feedback and Suggestions

All times are GMT. The time now is 12:18 PM.