DATASHEET 74161 PDF

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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That’s probably causing as much trouble as no debounce was.

By clicking “Post Your Answer”, you 744161 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. Email Required, but never shown. Finally, you should not count on TTL outputs driving high, as you have shown.

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As further issues arise I see myself stuck once more with a dysfunctional circuit. Home Questions Tags Users Unanswered.

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. I have added a debounce circuit, but still to dstasheet.

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

Sign up using Email and Password. I switched the LEDs around and connected their input to 5V and their ground to the output pins. Oh, Ill change that and see what happens. Since you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit.

I’d reduce that down to something in the nF to 1uF range. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. Sign up or log in Sign up using Google. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. Since you already need one section of aand there are 6 gates per IC, you simply go.

Get into the habit now. TTL works much better pulling loads down. Without this buffering, datasheey switch should not work on a button push, only on a release. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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I added a 0. Post as a guest Name. For breadboards, use a cap for each IC. Sign up dataaheet Facebook.

So your outputs should be connected like. I’m still getting the same effect. 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.

Also, have you added a 0. In that case, invert the signals going to your LEDs. For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. 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 datadheet is subject to these policies.

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. Then I used a pullup resistor for the clear switch. It’s always the simple things. WhatRoughBeast 49k 2 28