74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Binary Counters. These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. The DM74LSA and. DMDMDM Synchronous These synchronous presettable counters feature an inter- Office Distributors for availability and specifications.

Author: Akirg Kerisar
Country: Anguilla
Language: English (Spanish)
Genre: Photos
Published (Last): 14 January 2009
Pages: 498
PDF File Size: 18.34 Mb
ePub File Size: 14.76 Mb
ISBN: 549-9-60538-970-6
Downloads: 22884
Price: Free* [*Free Regsitration Required]
Uploader: Tolrajas

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. As further issues arise I see myself stuck once more with a dysfunctional circuit.

Whenever I press the clock button I get all of the leds on except maybe one or two, with some flashing during the button press. I have added a debounce circuit, but still to avail.

Fairchild Semiconductor

Without this buffering, your switch should not work on a button push, only on a release. Get into the habit now.

Finally, you should not count on TTL outputs driving high, as you have shown. TTL works much better pulling loads down. So your outputs should be connected like. Datw may object that this will provide LEDs which are on when the output is low, and off when the outputs are high, which is confusing.

  DVLA V33 FORM PDF

In that case, invert the signals going to your LEDs. Since you already need one section of aand there are 6 gates per IC, you simply go.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Home Questions Tags Users Unanswered. That’s probably causing as much counrer as no debounce was. I’d reduce that down to something in the nF to 1uF range.

Oh, Ill change that and see what happens. So your outputs should be connected like simulate this circuit — Schematic created using CircuitLab You may object that this will provide LEDs which are on when the output is low, and off when the outputs are high, which is counrer. Since you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit. WhatRoughBeast 49k 2 28 Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. Then I used a pullup resistor for the clear switch.

  ICELAND GEODYNAMICS CRUSTAL DEFORMATION AND DIVERGENT PLATE TECTONICS PDF

I switched the LEDs around and connected their input to 5V and their ground to the output pins. I’m still getting the same effect.

4-bit Synchronous Counter with Asynchronous Clear

Also, have you added a 0. I added a 0.

It’s always the simple things. For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. For breadboards, dqta a cap for each IC. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms.

N 4-bit counter not counting properly – Electrical Engineering Stack Exchange

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

Email Required, but never shown. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.