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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In that case, invert the signals going to your LEDs. WhatRoughBeast 49k 2 28 I’m still getting the same effect.
Oh, Ill change that and see what happens. Email Required, but never shown. It’s always the simple datahseet. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. I 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.
I’d reduce that down to something in the nF to 1uF range. TTL works much better pulling loads down. 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. Sign up using Email and Password. That’s probably causing as much trouble as no debounce was. 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. For a circuit datashert with a ground plane, the usual guideline is at least one cap per 5 ICs. Home Questions Tags Users Unanswered.
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Since you already need one section of aand there are 6 gates per IC, you simply go. Without this buffering, your switch should not work on a button push, only on a release. Then Datasheeh used a pullup resistor for the clear switch. I switched the LEDs around and connected their input to 5V and their ground to the output pins.
As further issues arise I see myself stuck once more with a dysfunctional circuit.