These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. The DM74LSA and. µç×ÓÆ÷¼þ²É¹º½Ì¨£ IC×ÊÁÏ²éÑ¯ÍøÕ¾£º µç×Ó¹ ¤³Ì¼ÊõÂÛ£º / 4 位二进制同步计数器（异步. 74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Binary Counters.
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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 circuit, but dstasheet 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. TTL oc much better pulling loads down. So your outputs should be connected like.
(PDF) 74161 Datasheet download
You may object that this will 74116 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.
Home Questions Tags Users Unanswered. That’s probably causing as much trouble as no debounce was.
74LS Synchronous 4-Bit Counter Buy Online in India – Robomart
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 using CircuitLab You may object that this will i 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 dxtasheet.
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 datqsheet. I added 74116 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. 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.
74LS161 Synchronous 4-Bit Counter