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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Without this buffering, your switch should not work on a button push, only on a release.
I added a 0. Get into the habit now. Also, have you added a 0. Sign up using Facebook. Home Questions Tags Users Unanswered. 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.
For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. So your datazheet 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. Oh, Ill change that and datahseet what happens. In that case, invert the signals going to your LEDs. I switched the LEDs around and connected their input to 5V and their ground to the output pins.
Then I used a pullup resistor for the clear switch. Finally, you should not count on TTL outputs driving high, as you have shown. 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. It’s always the simple things. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V.
Sign up or log in Sign up using Google. I’m still getting the same effect.
74161 Datasheet PDF
WhatRoughBeast 49k 2 28 For breadboards, use a cap for each IC. Sign up using Email and Password. Post as a guest Name.
Datasheet PDF –
Since you already need one section of aand there are 6 gates per IC, you simply go. Since you already need one section of aand there are 6 gates datawheet IC, you simply go simulate this circuit. I’d reduce that down to something in the nF to 1uF range. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms.
I have added a debounce circuit, but still to avail.