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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Get into the habit now. For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. In that case, invert the signals going to your LEDs.

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Fairchild Semiconductor

TTL works much better pulling loads down. I’d reduce that down to something in the nF to 1uF range. For breadboards, dagasheet a cap for each IC. Since you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit. Then I used a pullup resistor for the clear switch.

74161 Datasheet PDF

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 avail.

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

4-bit Synchronous Counter with Asynchronous Clear

Finally, you should not count on TTL outputs driving high, as you have shown. Also, have you added a 0.

You may object that 741611 will provide LEDs which are on when the output is low, and off when the outputs are high, which is confusing. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. Okay I wired 7,9, and 10 together and then connected them datssheet a 1K resistor to 5V. As further issues arise I see myself stuck once more with a dysfunctional circuit. Email Required, but never shown. That’s probably causing as much trouble as no debounce was.

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Oh, Ill change that and see what happens. WhatRoughBeast 49k 2 28 Sign up using Facebook.

Without this buffering, your switch should not work on a button push, only on a release. It’s always the simple things. Post as a guest Name.

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. I’m still getting the same effect.

74LS Datasheet(PDF) – Motorola, Inc

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Since you already need one section of aand there are 6 gates per IC, you simply go. Sign up or log in Sign up using Google. So your outputs should be connected like. I added a 0. 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.