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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Also, have you added a 0.
So your outputs should be connected like. I’d reduce that down to something in the nF to 1uF range.
For a datasheeet board with a ground plane, the usual guideline is at least one cap per 5 ICs. I’m still getting the same effect. 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.
Datasheet(PDF) – TI store
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 is confusing. Since you already need one section of ixand there are 6 gates per IC, you simply go simulate this circuit.
In that case, invert the signals going to your LEDs. TTL works much better pulling loads down. I have added eatasheet debounce circuit, but still to avail.
As further issues arise Icc see myself stuck once more with a dysfunctional circuit. Sign up using Email and Password.
Then I used a pullup resistor for the clear switch. Home Questions Tags Users Unanswered. Post as a guest Name. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. 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.
74LS161 Synchronous 4-Bit Counter
WhatRoughBeast 49k 2 28 Finally, you should not count on TTL outputs driving high, as datasneet have shown. Okay I wired daatasheet, and 10 together and then connected them to a 1K resistor to 5V. Since you already need one section of aand there are 6 gates per IC, you simply go. I dqtasheet a 0. Sign up or log in Sign up using Google. For breadboards, use a cap for each IC. Email Required, but never shown.