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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For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. I’m still getting the same effect.
WhatRoughBeast 49k 2 28 Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. I added a 0.
For breadboards, use a cap for each IC. Sign up or log in Sign up using Google. So your outputs should be connected like. Since you already need one section of aand there are 6 gates datasgeet IC, you simply go.
4-bit Synchronous Counter with Asynchronous Clear
Sign up using Email and Password. Whenever Datashset press the clock button I get all of the leds on except maybe one or two, with some flashing during the button press.
You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. Then I used a pullup resistor for the clear switch.
74161 Datasheet PDF
As further issues arise I see myself stuck once more with a dysfunctional circuit. Post as a guest Name.
So your outputs should be connected like simulate this circuit dtasheet 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. In that case, invert the signals going to your LEDs. Oh, Ill change that and see what happens.
74LS Datasheet(PDF) – Motorola, Inc
Get into the habit now.
Also, datasheeet you added a 0. It’s always the simple things. I switched the LEDs around and connected their input to 5V and their ground to the output pins. TTL works much better pulling loads down. Email Required, but never shown. I’d reduce that down to something in the nF to 1uF range. Finally, dataxheet should not count on TTL outputs driving high, as you have shown.
Sign up using Facebook. Since you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit. Without this buffering, your switch should not work on a button push, only on a release.