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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Without this buffering, your switch should not work on a button push, only on a release. Get into the xounter now. Finally, you should not count on TTL outputs driving high, as you have shown. TTL works much better pulling loads down. So your outputs should be connected like. 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.
74LS Datasheet pdf – Synchronous 4-Bit Binary Counters – Fairchild Semiconductor
Home Questions Tags Users Unanswered. That’s probably causing as much trouble as no debounce was. I’d reduce that down to something in the nF to 1uF range. Oh, Ill change that and see what happens.
So your outputs should be connected like simulate this circuit — Schematic created using CircuitLab You may object that this founter provide LEDs which are on when the output is datahseet, and off when the outputs are high, which is confusing. Since you already need one dahasheet of aand there are 6 gates per IC, you simply go simulate this circuit. WhatRoughBeast 49k 2 28 Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. Then I 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. I’m still getting the same effect. Also, have you added a 0.
I added a 0. It’s always the simple things. For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. For breadboards, use a cap for each IC.
You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. Sign up or log in Sign up using Google.
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4-bit Synchronous Counter with Asynchronous Clear