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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Finally, you should not count on TTL outputs driving high, as you have shown.
Datasheet(PDF) – TI store
adtasheet It’s always the simple things. I switched the LEDs around and connected their input to 5V and their ground to the output pins. WhatRoughBeast 49k 2 28 For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. I have added a debounce circuit, but still to avail. Sign up or log in Sign up using Google.
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. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.
Sign up using Email and Password. Also, have you added a 0. Since you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit.
You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. ratasheet
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 of serviceprivacy policy and cookie policyand that your continued use of the website 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. Home Questions Tags Users Unanswered. I’m still getting the same effect. Email Required, but never shown. Since you already need one section of aand there are 6 gates per IC, you simply go.
As further issues arise I see myself stuck once more with a dysfunctional circuit. Then I used a pullup resistor for the clear switch.
(PDF) 74161 Datasheet download
Oh, Ill change that and see what happens. Without this buffering, your switch should not work on a button push, only on a release. So your outputs should be connected datasgeet 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’d reduce that down to something in the nF to 1uF range. For breadboards, use a cap for each IC. Post as a guest Name.
74LS161 Synchronous 4-Bit Counter
So your outputs should be connected like. Get into the habit now. I added a 0.
That’s probably causing as much trouble as no debounce was. TTL works much better pulling loads down. Okay Daatsheet wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. Sign up using Facebook.