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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Fairchild Semiconductor – datasheet pdf
Sign up using Email and Password. Then I used a pullup resistor for the clear switch. Also, have you added a 0. Sign up or log in Sign up using Google.
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. Sign up using Facebook. 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. WhatRoughBeast 49k 2 28 As further issues arise I see myself stuck once more with a dysfunctional circuit. I’d reduce that down to something in the nF to 1uF range.
Since you already need one section of aand there are 6 gates per IC, you simply go. Datasheet always the simple things.
For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. I have added a debounce circuit, but still to avail. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms.
74LS Datasheet pdf – Synchronous 4-Bit Binary Counters – Fairchild Semiconductor
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I added a 0. Get into the habit now. Finally, you should not count on TTL outputs driving high, as you have shown.
For breadboards, use a cap for each IC. TTL works much better pulling loads down. Without this buffering, your switch should not work on a button push, only on a release. I’m still getting the same effect.