Texas Instruments 74HC Counter ICs are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas Instruments 74HC The M54/74HC/ are a high speed CMOS SYN-. CHRONOUS UP/DOWN DECADE COUNTERS fab- ricated in silicon gate C. 2. MOS technology. 74HC datasheet, 74HC circuit, 74HC data sheet: PHILIPS – Presettable synchronous BCD decade up/down counter,alldatasheet, datasheet, .
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74HC pdf datasheet-电子发烧友网
I have succesfuly connected the circuit having 2 74HC, and 2 seven seg displays. I cannot find a way for the circuit to begin counting from were I want it.
74HC – Decade Up/Down Counter with Clear
Yes I know that it is floating, since I tried several different ways. Use a simple switch push button with say a 2. I connected the circuit as you told me and is now working good when I press the ‘button’ switch.
That will reload the counters.
You will have to use logic gate so combine the two outputs. Are you sure that the push PL switch is drawn correctly.? When the switch is not pressedU C pin 10 is Low, so U I think you are reffering to U8: 74h192 that should be U8.
Yes yes, the switch is not pressed before the user adjusts the dipswitch for the number he wants. Are you using the normally closed contacts on the PL switch.? So when the switch is operated the contacts open, this would make sense.
I am saying that if swith is not pressed, only the number is shown and there will be no counting downward. Are you now satisfied with the circuits operation.?