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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We haven’t talked about the carry from the seconds counter to the minutes counter yet. Eventually the output of IC10C goes high when a button is pressed.


In Run mode only the SET button will have any effect, the other 3 buttons are inhibited. This is a nice 0. It uses a From then on the flip-flop remains in that state, until the hours counter is reset to 0 again.

It’s a bed side table clock, I don’t need it to light up the entire room at night, you know. BPete This could be a problem with the original 16MHz crystal Unfortunately I don’t have the datasheetbut the 11MHz one that Hwf4060 used, with 22pF capacitors, is the one that I used in dozens of other circuits, without problems.

However that would require one extra chip for just one gate, whereas I had a spare flip-flop available which could be ab used for the same job. Once the counters reach that state they are reset back to 0 again. This will daatsheet the stability of your clock. Dataasheet that would require one extra chip for just one gate, whereas I had a spare flip-flop available which could be ab used for the same job.


This counter is also formed by 2 decade counters. As such, your effective crystal loading capacitance may be far exceeding the point where the circuit will successfully begin or sustain oscillation. You could try to separate components on the breadboard, but this increases lead inductance in the connecting wires which have to be longer.

So, the logic and Master Reset is working, but the counter is not.

SB-Projects – Projects – CMOS Clock – Hardware

Moreover I don’t have the datasheet for the specific xtal, so I don’t know how to find right capacitor values. Basically, the intrinsic capacitance of the breadboard may already be equivalent to the needed crystal load caps. On the next page I’ll explain the display circuit and power supply of the clock.

Moreover, I think that if I have a 11MHz signal output on the pin 9, it should means that the oscillator is working Its signal level is constantly low, with only a very short rising pulse when the counter reaches 60 minutes.

Home Questions Tags Users Unanswered. And when some pin is at 1, if I raise MR, pin goes to 0. In SET mode the SET signal is high, and the seconds darasheet minutes carry can never occur because the seconds counter is held in reset.

When the second decade reaches 6 the output of IC10A will go low.

As a matter of fact, there’s no more on sheet number one to be explained. Post as a guest Name. It also produces several other division ratios.


We need 1Hz, not 2Hz, to feed to our seconds counter. But this time the maximum count value is limited to I would make sure the capactor values C6 and C7 are within the range reccomended in the hec4060 data sheet. Axeman I’m happy you got it working! Let’s start simple, the buttons, which are used to set the time.

One significant factor that most people neglect is the series parasitic inductance on the supply line. This makes the output of IC10C constant low, except during the carry pulse. This is negligible for most frequencies, but if you are operating in the RF spectrum this quickly datashfet problematic.

The Minutes Counter Next stop, the minutes counter. I suggest fitting a 10nF to nF ceramic capacitor next to the hole of pin 16 and pin 8 respectively. In my case the pulse was about ns wide. The length of supply lines is almost always more than two inches from the power supply to the breadboard. When the hours counter is reset, so is the flip-flop, making its Q output high.

IC2 forms hef datasheet time base oscillator and first pre-scaler stage. You can download the circuit diagram here. This reset pulse is very short, because once it is high, the counters are reset and the reset hef datasheet is gone again.

This is generally why high frequency devices avoid breadboards.