Data sheet acquired from Harris Semiconductor. SCHSC − Revised October HCDB consists of an oscillator section and December CDBMS. CMOS 14 Stage Ripple-Carry Binary Counter/ Divider and Oscillator. DATASHEET. Pinout. Functional Diagram. HEF Datasheet, HEF PDF, HEF Data sheet, HEF manual, HEF pdf, HEF, datenblatt, Electronics HEF, alldatasheet, free.

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Maybe this should datawheet another question Moreover I don’t have the datasheet for the specific xtal, so I don’t know how to find right capacitor values.

The Q output will be used by the display part of the circuit to suppress the leading 0 of the hours counter. IC4A divides the 1Hz pulse by The 16Mhz one still have some problem, because it starts to oscillate only if I remove the capacitor between PIN11 and ground. In Run mode only the SET button will have any effect, the other 3 buttons are inhibited. TP1 is a test point at hef datasheet you hef datasheet measure the buffered hef datasheet While the clock is in run mode SET is high, opening the gate for the carry pulse.

In SET mode the SET signal is high, and the seconds darasheet minutes carry dwtasheet never occur because the seconds counter is held in reset. The Minutes Counter Dahasheet stop, the minutes counter.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I’ve rebuilt the circuit datadheet a different layout on a different breadboard, and now it works with 4MHz, 11MHz and The 14 stage counter is receiving a signal from the oscillator stage as I can see it on the pin 9 but doesn’t count.



This pulse is used to flash the colon between the hour digits and the minute digits on the display. Therefore IC9C will inversely follow the low going carry signal from the minutes counter.

We haven’t talked about the carry from the seconds counter to the minutes counter yet.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Like I said in a comment before, you may need to start looking for the dataheet, or things that you take for granted because they usually don’t fail: Pins are almost always zero. However, it would make changing the crystal somewhat more involved.

The oscillator part datadheet built as described in the HEF data sheet. Axeman I’m happy you got it working!


We’ll have to tell the clock what time it is when it has lost all its power anyway. IC4B tries to do the same for the 0. Both inputs of IC10D are high when the button is pressed, making its output low.

Now IC9D will inverse the pulses hef datasheet from the push button. The problem could be related to testing at near the device’s maximum frequency on a breadboard. C5 is used to set the correct frequency. It also produces several other division ratios. This pulse is used to flash the colon between the hour digits and the minute digits on the display.


Basically, the intrinsic capacitance of the breadboard may already be equivalent to the needed crystal load caps. Everything is built on pad board using Road Runner wiring to connect all the components together.

You could try to separate components on the breadboard, but this increases lead inductance in the connecting wires which have to be longer. At the end it will produce an accurate frequency of 2Hz hf4060 output pin 3. I would make sure the capactor values C6 and C7 are within the range reccomended in the crystal data sheet.

This reset pulse is also used as carry to the hours counter. I tried with some random values, from 1 to pF, and nothing. Together with this knowledge you should be able to build the datasjeet yourself too. The first problem is with the 16Mhz xtal the thing doesn’t even start to oscillate. When the second decade reaches 6 the output of Daatasheet will go low.

So, everything should work as expected.

It is spread over two sheets, one sheet covers the time base and the seconds, minutes and hours counters.