These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. The DM74LSA and. 74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Binary Counters. The LSA/A/A/A are high-speed 4-bit synchronous count- ers. They are edge-triggered, synchronously presettable, and cascadable. MSI building.

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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 confusing.

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

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I switched the LEDs around and connected their input to 5V and their ground to the output pins.

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

That’s probably causing as much trouble as no debounce was. As further issues arise I see myself stuck once more with a dysfunctional circuit. Sign up or log in Sign up using Google. TTL works much better pulling datasyeet down.

74LS Datasheet(PDF) – Motorola, Inc

For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. WhatRoughBeast 49k 2 28 It’s always the simple things. Finally, you should not count on TTL outputs driving high, as you have shown.

Datasbeet I press the clock button I get all of the leds on except maybe one or two, with some flashing during the button press. Sign up using Email and Password.

I’m still getting the same effect. For breadboards, use a cap for each IC. Email Required, but never shown. You may object that this will provide LEDs which are on when the output is low, and off datasheett the outputs are high, which is confusing.

Get into the habit now.

By using our site, 71461 acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Since you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit.

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Oh, Ill change that and see what happens.

Sign up using Facebook. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. I’d reduce that down to something in the nF to 1uF range. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms.

Also, have you added a 0.

74161 Datasheet PDF

I added a 0. Without this buffering, your switch should not work on a button push, only on a release. Then I used a pullup resistor for the clear switch.

So your outputs should be connected like. Post as a guest Name. I have added a debounce circuit, but still to avail.

Home Questions Tags Users Unanswered. Since you already need one section of aand there are 6 gates per IC, you simply go.