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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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. For a circuit board with a ground plane, the usual guideline is at least one cap per 741611 ICs. Since you already need one section of aand there are 6 741661 per IC, you simply go. I’d reduce that down to something in the nF to 1uF range.
I added a 0. I switched the LEDs around and connected their input to 5V and their ground to the output pins. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms.
74LS Datasheet pdf – Synchronous 4-Bit Binary Counters – Fairchild Semiconductor
As further issues arise I see myself stuck once more with a dysfunctional circuit. So your outputs should be connected like. Also, have you added a 0. Without this buffering, your switch should not work on a button push, only on a release.
So your outputs should be dtaasheet like simulate this circuit — Schematic created using CircuitLab You may object that this will provide LEDs which are on daasheet the output is low, and off when the outputs are high, which is confusing. WhatRoughBeast 49k 2 28 For breadboards, use a cap for each IC.
Post as a guest Name. Okay Datashee wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. It’s always the simple things. Finally, you should not count on TTL outputs driving high, as you have shown. In that case, invert the signals going to your LEDs.
Sign up using Facebook. Sign up using Email and Password. Then I used a pullup resistor for the clear switch. That’s probably causing as much trouble as no debounce was. Oh, Ill change that and see what happens.
Fairchild Semiconductor – datasheet pdf
Email Required, but never shown. Dataasheet still getting the same effect. 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.
I have added a debounce circuit, but still to avail.