74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Binary Counters. These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. The DM74LSA and. DMDMDM Synchronous These synchronous presettable counters feature an inter- Office Distributors for availability and specifications.
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Since you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit. That’s probably causing as much trouble as no debounce was.
I have added a debounce circuit, but still to avail. So your outputs should be connected like. Post as a guest Name.
You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. For breadboards, use a cap for each IC. Sign up using Facebook.
It’s always the simple things.
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.
74LS Datasheet pdf – Synchronous 4-Bit Binary Counters – Fairchild Semiconductor
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. Oh, Ill change that and see what happens.
Also, have you added a 0. I’d reduce that down to something in the nF to 1uF range. 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.
Email Required, but never shown. Since you already need one section of aand there are 6 gates per IC, you simply go. I added a 0. TTL works much better pulling loads down. Then I used a pullup resistor for the clear switch.
Sign up or log in Sign up using Google. WhatRoughBeast 49k 2 28 Home Questions Tags Users Unanswered. 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.