Quantcast Figure 3-26. Ring counter: A. Logic diagram; B. Timing diagram.

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
3-28 then only one device may be HIGH at one time. As the clock, or input, signal is received, the specified state will shift to the next device at a rate of 1 shift per clock, or input, pulse. Figure 3-26, view A, shows a typical four-stage ring counter. This particular counter is composed of R-S FFs. J-K FFs may be used as well. Notice that the output of each AND gate is input to the R, or reset side, of the nearest FF and to the S, or set side, of the next FF. The Q output of each FF is applied to the B input of the AND gate that is connected to its own R input. Figure 3-26. —Ring counter: A. Logic diagram; B. Timing diagram. The circuit input may be normal CLK pulses or pulses from elsewhere in the equipment that would indicate some operation has been completed. Now, let’s look at the circuit operation and observe the signal flow as shown in figure 3-26, view B. For an initial condition, let’s assume that the output of FF1 is HIGH and that the input and FF2, FF3, and FF4 are LOW. Under these conditions, lamp A will be lit; and lamps B, C, and D will be extinguished. The HIGH from FF1 is also applied to the B input of AND gate 1. The first input pulse is applied to the A input of each of the AND gates. The B inputs to AND gates 2, 3, and 4 are LOW since the outputs of FF2, FF3, and FF4 are LOW. AND gate 1 now has HIGHs on both inputs and produces a HIGH output. This HIGH simultaneously resets FF1 and sets FF2. Lamp A then goes out, and lamp B goes on. We now have a HIGH on AND gate 2 at the B input. We also have a LOW on AND gate 1 at input B.


Electrical News
Friday Quiz: Bipolar Transistors
Remember basic transistor physics? Let's see if you really do....
eetimes.com
9 Top Tech from Electronica 2014
After 50 years, Europe's bellwether conference Electronica shows the state...
eetimes.com
Micron Expands IoT & Auto Memory Products
Micron expanded its offerings for embedded applications and the connected...
eetimes.com
Moore's Law Competitor Wins $150K Elevator Pitch Prize
Quilt packaging wins $150,000 prize for best elevator pitch explaining...
eetimes.com
Nexus 6 Vs. iPhone 6 Plus: Phablet Deathmatch
There's never been a better time to buy a big-screened...
eetimes.com
Europe vs. Google
Google may not give much thanks for the gift Europe...
eetimes.com
Stephen Hawking: How He Speaks & Spells
The technology that helped resurrect the life of Stephen Hawking...
eetimes.com
Sony's 3-Year Plan: Treading Water or Just Sinking?
Sony's three-year outlook for its mobile business "isn't aiming for...
eetimes.com
HMC Spec Update Signals Healthy Adoption
The release of the Hybrid Memory Cube specification 2.0, along...
eetimes.com
Power Week: Si-Based Power Discretes to Continue to Dominate Over Next Decade
Discrete power electronics are predicted to become a $23 billion...
eetimes.com
Book Review: Deadly Odds by Allen Wyler
This is a great read that will have you on...
eetimes.com
Supercapacitors: A New Hero in the Spotlight
Today's supercapacitors are being used to replace rechargeable batteries in...
eetimes.com
EEVblog #687 – EFTPOS PIN Pad Terminal Teardown
What’s inside a smart card pinpad EFTPOS terminal? Dave looks...
eevblog.com
Your Part in the Recovery
Engineers and innovators are central to the slow but ongoing...
eetimes.com
Motor Controllers Offer Improved Noise Immunity
Operating at 5V gives these digital signal controllers enhanced noise...
eetimes.com
NXP to Pick Up Its Missing IoT Link - Bluetooth Low Energy
In pursuit of the Internet of Things market, NXP Semiconductors...
eetimes.com
USB Oscilloscopes Get Beta Drivers for Open-Source Hardware
Pico Technology has released beta versions of drivers for BeagleBoneBlack...
eetimes.com
It's Alive! The 3D Printing of Living Tissues
Within a generation, we likely will not just hear of...
eetimes.com
Curiosity Killed the Cat (Just Call Me Mr. Curiosity)
Max desperately needs a cat deterrent, but how should this...
eetimes.com
Memory Design Articles: Diagnostics, Datacenters & Failures
Here's a roundup of recent design articles that are relevant...
eetimes.com
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +