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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Also, have you 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. So your outputs should be connected like.

I added a 0. 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. Post as a guest Name.

74161 Datasheet PDF

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In that case, invert the signals going to your LEDs. Then I used a pullup resistor for the clear switch.

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

Email Required, but never shown. Finally, you should not count on TTL outputs driving high, as you have shown. 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.

Fairchild Semiconductor

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. That’s probably causing as much trouble as no debounce was. For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. Get into the habit now. WhatRoughBeast 49k 2 28 For breadboards, use a cap for each IC.

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Without this buffering, your switch should not datashewt on a button push, only on a release. I switched the LEDs around and connected their input to 5V and their ground to the output pins.

TTL works much better pulling loads down. I have added a debounce circuit, but still to avail. As further issues arise I see datasyeet stuck once more with a dysfunctional circuit. Sign up or log in Sign up using Google.

4-bit Synchronous Counter with Asynchronous Clear

Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. Sign up using Facebook. I’m still getting the same effect. Oh, Ill change that and see what happens.

I’d reduce that down to something in the nF to 1uF range. It’s always the simple things. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms.

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