HEF Datasheet, HEF PDF, HEF Data sheet, HEF manual, HEF pdf, HEF, datenblatt, Electronics HEF, alldatasheet, free. 15 Apr Data sheet acquired from Harris Semiconductor. SCHSC − Revised October HCDB consists of an oscillator section and CMOS Stage Ripple-Carry Binary Counter/Divider and Oscillator. CMOS Stage Ripple-Carry Binary Counter/Divider and Oscillator – CDB. Datasheet.

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The Hardware Part 1 You can download the circuit diagram here.

On the next page I’ll explain the display circuit and power supply of the clock. IC2 forms the hef4060 datasheet base oscillator and first pre-scaler stage. Both inputs of IC10D are high when the button is hef4060 datasheet, making its output low. What is IC3B doing there?

It is spread over two sheets, one sheet covers the time base and the seconds, minutes and hours counters. While the clock is in SET mode there won’t come any carry hef4060 datasheet from the minutes counter and that signal is constantly high. The output pulse from IC10A also goes out to the minutes counter, which has to be advanced at every overflow of the seconds counter. From then on the flip-flop remains in that state, until the hours counter is reset to 0 again.

In my case the pulse was about ns wide. Please consider clicking on the Support Me button to show your appreciation. The Time Base IC2 forms the time base oscillator and first pre-scaler stage.


IC4A divides the 1Hz pulse by The precision of hef4060 datasheet resistor value hef4060 datasheet no effect on the precision of the time base B.

C5 is used hef4060 datasheet set the correct hef4060 datasheet. And now the hours counter. Next stop, the minutes counter. Both buttons have a debouncing capacitor in parallel to make sure that every dagasheet press results in just one pulse.

The CLK input to the flip-flop is low, because the hours counter has just been reset to 0.

You can download the circuit diagram here. At the end it will produce an accurate frequency of hef4060 datasheet on output pin 3. There’s one hff4060 we might use though. It’s output Q0 of the first decade counter IC4A. The oscillator part hef4060 datasheet built as described in the HEF data sheet.

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Once the counters reach that state hef4060 datasheet are hef4060 datasheet back to 0 again. I don’t need the output of the hef4060 datasheet counter itself, because I do not have a seconds display. This pulse is very short because its cause is removed by the reset almost instantly. When the clock is switched to SET mode though, the SET line goes low, which keeps the reset line to the seconds counter constantly high, preventing the seconds counter to count.

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IC4B tries to do the same for the 0. Its signal level is constantly low, with only a very short rising pulse when the counter reaches 60 minutes. It also produces several other hef4060 datasheet ratios. We are only interested in two others, the Hz and the 64Hz outputs, which are used hsf4060 the display section of the clock. The carry hef4060 datasheet the seconds counter is constantly high, with only a short carry pulse every 60 seconds. It’s a bed side table clock, I don’t need it to light up the entire room at night, you know.

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The Buttons Let’s start simple, the buttons, which are used to set the time. This makes the hef4060 datasheet of IC10C constant low, except during the carry pulse.

HEF datasheet, HEF datasheets, manuals for HEF electornic semiconductor part

It is very important to use 0 tempco capacitor for C4. The Q output will be used by the display part of the circuit hef4060 datasheet suppress the leading 0 of the hours counter. This allows you to advance the hours counter. When the second hef4060 datasheet reaches 6 the output of IC10A will go low.

This pulse is used to flash the colon between the hour digits and the minute digits on the display. This will produce a high going reset hef4060 datasheet on the output of IC10B.

This reset pulse is very short, because once it is high, the hef406 are reset and the reset pulse is hef4060 datasheet again.