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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74LS161 Synchronous 4-Bit Counter
I have added a debounce circuit, but still to avail. 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.
Sign up using Email and Password. It’s always the simple things. As further issues arise I see myself stuck once more with a dysfunctional circuit. Also, have you added a 0. 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. Post as a guest Name.
4-bit Synchronous Counter with Asynchronous Clear
74LS Synchronous 4-Bit Counter Buy Online in India – Robomart
So your outputs should be connected like. Sign up or log in Sign up using Google. I added a 0.
That’s probably causing as much trouble as no debounce was. Finally, you should not count on TTL outputs driving high, as you have shown. Since you already need one section of aand there are 6 gates per IC, you simply go simulate this circuit.
(PDF) 74161 Datasheet download
I’d reduce that down to something in the nF to 1uF range. Email Required, but never shown. Then I used a pullup 71461 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.
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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. Oh, Ill change that and see what happens. I switched the LEDs around and connected their input to 5V and their ground to the output pins. TTL works much better pulling loads down. Since you already need one section of aand there are 6 gates per IC, you simply go.