74LS Synchronous 4-bit Binary Counters. These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed. 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.
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I’m still getting the same effect. Post as a guest Name. Sign up using Email and Password. Also, have you added a 0. As further issues arise I see myself stuck once more with a dysfunctional circuit. You can often get away with less, but as you’ve just learned, insufficient decoupling can datasheey weird symptoms. Then I used a pullup resistor for the clear switch.
WhatRoughBeast 49k 2 28 Get into the habit now.
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74LS Datasheet pdf – Synchronous 4-Bit Binary Counters – Fairchild Semiconductor
Without this buffering, your switch should not work on a button push, only on a release. 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. That’s probably causing as much trouble as no debounce was. Okay I wired 744161, and 10 together and then connected them to a 1K resistor to 5V. Home Questions Tags Users Unanswered.
I have added a debounce countr, but still to avail.
So your outputs should be connected like. For counetr, use a cap for each IC. I’d reduce that down to something in the nF to 1uF range. TTL works much better pulling loads down. For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. I added a 0. Sign up using Facebook.
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 countrr the outputs are high, which is confusing. Oh, Ill change that and see what happens.
Since you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit. I switched the LEDs around and connected their input to 5V and their ground to the output pins.
Finally, you should not count on TTL outputs driving high, as you have shown.