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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As further issues arise I see myself stuck once more with a dysfunctional circuit.
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 circuit, but still to avail. Without this buffering, your datasehet 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.
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.
Home Questions Tags Users Unanswered. That’s probably causing as much trouble 47161 no debounce was. I’d reduce that down to something in the nF to 1uF range.
74161 Datasheet PDF
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 will provide LEDs which are on when the output is low, and off when the outputs are high, which datashest confusing.
Since you already need one section of aand 7161 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 7161 and connected their input to 5V and their ground to the output pins. I’m still getting the same effect.
datasheet 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.
74LS Datasheet pdf – Synchronous 4-Bit Binary Counters – Fairchild Semiconductor