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.
I switched the LEDs around and connected their input to 5V and their ground to the output pins.
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. Finally, you should not count on TTL outputs driving high, as you have shown. For a dahasheet board with a ground plane, the usual guideline is at least one cap per 5 ICs.
I’d reduce that down to something in the nF to 1uF range. Email Required, but never shown.
Sign up using Email and Password. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms.
Home Questions Tags Users Unanswered. I’m still getting the same effect.
4-bit Synchronous Counter with Asynchronous Clear
Sign up or log in Sign up using Google. Without this buffering, your switch should not work on a button push, only on a release. Then I used a pullup resistor for the clear switch. Datashfet added a 0.
N 4-bit counter not counting properly – Electrical Engineering Stack Exchange
In that case, invert the signals going to your LEDs. It’s always the simple things. As further issues arise I see myself stuck once more with a dysfunctional circuit. Whenever I press the clock button I get datasheeg of the leds on except maybe one or two, with some flashing during the button press.
That’s probably dataseet as much trouble as no debounce was. Since you already need one section of aand there are 6 gates per IC, you simply go. So your outputs should be connected like. Get into the habit now. Sign up using Facebook. Post as a guest Name. For breadboards, use a cap for each IC. 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 one section of aand there are 6 gates per IC, you simply go simulate this circuit.
Also, have you added a 0. Oh, Ill change that and see what happens.