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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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.
74LS Datasheet pdf – Synchronous 4-Bit Binary Counters – Fairchild Semiconductor
It’s always the simple things. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. Sign up using Email and Password. For breadboards, use a cap for each IC.
Also, have you added a 0. In that case, invert the ci going to your LEDs. Finally, you should not count on TTL outputs driving high, as you have shown. Email Required, but never shown. For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs.
74LS161 Synchronous 4-Bit Counter
I’m still getting the same effect. You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms.
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Since you already need one section of aand datashee are 6 gates per IC, you simply go simulate this circuit. So your outputs should be connected like.
N 4-bit counter not counting properly – Electrical Engineering Stack Exchange
Sign up using Facebook. I have added a debounce circuit, but still to avail.
Sign up or log in Sign up using Google. 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. TTL works much better pulling loads down. Then I used a pullup resistor for the clear switch. I’d reduce that down to something in the ratasheet to 1uF range.
Oh, Ill change that and see what happens. Home Questions Tags Users Unanswered. I added a 0. Without this buffering, your switch should not work on a button push, only on a release. 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.