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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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 have added a debounce dwtasheet, but still to avail. Without this buffering, your switch should not work on a button push, only on a release. Get into the habit now.
Finally, you should not count on TTL outputs driving high, as you have shown.
4-bit Synchronous Counter with Asynchronous Clear
Fairchild Semiconductor – datasheet pdf
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 counte 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.
Since you already need one section 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 dattasheet a ground plane, the usual guideline is counrer 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. Sign up using Facebook. Sign up using Email and Password.