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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TTL works much better pulling loads down. That’s probably causing as much trouble as no debounce was. Since you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit. I’d reduce that down to something in the nF to 1uF range. Oh, Ill change that and see what happens. Then I used a pullup resistor for the clear switch. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V.
For a circuit board with darasheet ground plane, the usual guideline is at least one cap per 5 ICs. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. Whenever I press the clock ddatasheet I get all of the leds on except maybe one or two, with some flashing during the button press.
(PDF) 74161 Datasheet download
Without this buffering, your switch should not work on a button push, only on a release. Sign up using Email and Password. I’m still getting the same effect. For breadboards, use a cap for each IC.
74LS161 Synchronous 4-Bit Counter
Email Required, but never shown. You may object that this will provide LEDs which are on when datasheeh output is low, and off when the outputs are high, which is confusing. I added a 0. Get into the habit now.
4-bit Synchronous Counter with Asynchronous Clear
Sign up using Facebook. So your outputs should be connected like.
So your outputs should be connected like simulate this circuit — Schematic datsheet 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. I have added a debounce circuit, but still to avail. Also, have you added a 0.
Sign up or log in Sign up using Google. It’s always the simple things.
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