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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Post as a guest Name. Since you already need one section of a 741161, and there are 6 gates per IC, you simply go simulate this circuit.
Datasheet(PDF) – TI store
In that case, invert the signals going to your LEDs. So your outputs should be connected like. Finally, you should not count on TTL outputs driving high, as you have shown. I’m still getting the same effect. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. So your outputs should be connected like simulate this circuit — Schematic created using CircuitLab You datssheet object that this will provide LEDs datasueet are on when the output is low, and off when the outputs are high, which is confusing.
TTL works much better pulling loads down. Home Questions Tags Users Unanswered. For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs.
74LS161 Synchronous 4-Bit Counter
Also, have you added a 0. WhatRoughBeast 49k 2 28 Without this buffering, your switch should not work on a button push, only on a release.
Then I used a pullup resistor for the clear switch. 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. I added a 0.
(PDF) 74161 Datasheet download
It’s always the simple things. Sign up using Email and Password. As further issues arise I see myself stuck once more with a dysfunctional circuit.
Get into the habit now. Since you already need one section of aand there are 6 gates per Dstasheet, you simply go. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. Oh, Ill change that and see what happens.
For breadboards, use a cap for each IC. Email Required, but never shown.
That’s probably causing as much trouble as no debounce was. I have added a debounce circuit, but still to avail. Whenever I press the clock button I get all of the leds on except maybe one or two, datashete some flashing during the button press.