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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Also, have you 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. So your outputs should be connected like.
I added a 0. 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. Post as a guest Name.
74161 Datasheet PDF
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In that case, invert the signals going to your LEDs. Then I used a pullup resistor for the clear switch.
Email Required, but never shown. 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.
Without this buffering, your switch should not datashewt on a button push, only on a release. I switched the LEDs around and connected their input to 5V and their ground to the output pins.
TTL works much better pulling loads down. I have added a debounce circuit, but still to avail. As further issues arise I see datasyeet stuck once more with a dysfunctional circuit. Sign up or log in Sign up using Google.
4-bit Synchronous Counter with Asynchronous Clear
Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. Sign up using Facebook. I’m still getting the same effect. Oh, Ill change that and see what happens.
I’d reduce that down to something in the nF to 1uF range. It’s always the simple things. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms.