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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SB-Projects – Projects – CMOS Clock – Hardware

IC2 also contains a 14 bit divider chain. At the end it will produce an accurate frequency of 2Hz on output pin 3. You can hef4060 datasheet the circuit diagram here. This not only prevents hef4060 datasheet clock from advancing every hef4060 datasheet during SET mode, it also starts counting a whole new minute once the clock is set to RUN hef4060 datasheet again.

Hef4060 datasheet output pulse from IC10A also goes out to the minutes counter, which has to be advanced at every overflow of the seconds counter.

In Run mode only the SET button will have any effect, the other 3 buttons are inhibited. Once the counters reach that state they are reset back to 0 again. 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 hef4060 datasheet same job. The Buttons Let’s start simple, the buttons, which are used to set the time. This will produce a high going reset pulse on the output of IC10B.


Let’s start simple, the buttons, which are used to set the time. But when the most significant digit of the hours counter increments the clock input of the flip-flop rises, which sets hef4060 datasheet flip-flop, making the Q output low. There’s one output we might use though. The precision of the resistor value has no effect on hef4060 datasheet precision of the time base B. This pulse is used to flash the colon between the hour digits and the minute digits on the display. This reset pulse is very short, because once it is high, the counters are reset and the reset pulse is gone again.

CDB CMOS Stage Ripple-Carry Binary Counter/Divider and Oscillator |

The Q output will be used by the display part of the circuit to suppress the leading 0 of the hours counter. We are only interested in two others, the Hz and the 64Hz outputs, which are used in the display section of the clock. It doesn’t really matter whether we hef4060 datasheet a rising or falling edge here because this carry pulse is very short. The CLK input to the flip-flop is low, because the hours counter hef4060 datasheet just been reset to 0.

Результаты поиска для HEF4060

And now the hours counter. IC4B tries to do the same for the 0.

It’s output Q0 of the first decade counter IC4A. When the second decade reaches 6 the output of IC10A will hef4060 datasheet low. It is very important to use 0 tempco capacitor for Hec4060. When the clock is switched hef4060 datasheet 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.


The other sheet covers the display circuit and the power supply.

hef4060 datasheet It also produces several other division ratios. The carry from the seconds counter is constantly high, with only a short carry pulse every 60 seconds.

When the carry pulse goes high too, the output of Hef4060 datasheet goes low briefly. My way of keeping this site alive. Hef4060 datasheet is a test point at which you can measure the buffered The Hours Counter And now the hours datashset. This helps to tune the frequency of the time base to the correct value.

When the hours counter is reset, hef4060 datasheet is the flip-flop, making its Q output high. Hef4060 datasheet uses a This page will describe sheet one in detail, while the next page will describe sheet number two. Both buttons have a debouncing capacitor in parallel to make sure that every button press results in just one pulse.

We’ll have to tell the clock what time it hef4060 datasheet vatasheet it has lost all its power anyway. Together with this knowledge you should be able to build the clock yourself hef4060 datasheet. The Time Base IC2 forms the time base oscillator and first pre-scaler stage.