IC 74161 DATASHEET PDF

These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. The DM74LSA and. µç×ÓÆ÷¼þ²É¹º½Ì¨£ IC×ÊÁϲéѯÍøÕ¾£º µç×Ó¹ ¤³Ì¼ÊõÂÛ£º / 4 位二进制同步计数器(异步. 74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Binary Counters.

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For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. So your outputs should be connected like.

You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. Oh, Ill change that and see what happens. Then I used a pullup resistor for the clear switch. 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.

Since you already need datassheet section of aand there are 6 gates per IC, you simply go simulate this circuit. I have added datasheer debounce circuit, but still to avail. 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. 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 datashset is subject to these policies.

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I’d reduce that down to something in the nF to 1uF range. I added a 0.

For breadboards, use a cap for each IC. Sign up using Email and Password. Sign up using Facebook.

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

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

In that case, invert the signals going to your LEDs. Post as a guest Name. Sign up or log in Sign up using Google. 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.

Finally, you should not count on TTL outputs driving high, as you have shown. WhatRoughBeast 49k 2 28 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. Without this buffering, your switch should not work on a button push, only on a release. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V.

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It’s always the simple things. Since you already need one section of aand there are 6 gates per IC, you simply go. Home Questions Tags Users Unanswered.

(PDF) 74161 Datasheet download

Get into the habit now. I’m still getting the same effect.

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.