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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Pins are almost always zero.
Otherwise the roll over of the minutes counter would advance datashfet hours counter datashert. At the end it will produce an accurate frequency of 2Hz on output pin 3.
This will produce a high going reset pulse on the output of IC10B. 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. I can see with the ‘scope that I have a nice 11Mhz sinusoidal waveform on the pin 11, and I see a not-so-nice square-ish waveform on the pin 9 so, I imagine that oscillator parts works fine. Both inputs of IC10D are high when the button is pressed, making its output low.
Dataheet Minutes Counter Next stop, the minutes counter. Therefore IC9C will inversely follow the low going carry dztasheet from the minutes counter. The Hours Counter And now the hours counter.
This makes the output of IC10C constant low, except during the carry pulse. The Buttons Let’s start simple, the buttons, which are used to set the time. 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. Axeman 3, 14 This reset pulse is very short, because once it is high, the counters are reset and the reset hef datasheet is gone again.
This counter is also formed by 2 decade counters. But I think that this could be a problem caused by the breadboard as apalopohapa said. But this time the maximum count value is limited to This allows hef datasheet to advance dataheet hours counter.
In SET mode the SET signal is high, and the seconds to minutes carry can never occur because the seconds counter is held in reset. Otherwise the roll over of the minutes counter would advance the hours counter too.
HEF4060 DATASHEET EPUB DOWNLOAD
Another link from an Illinois ECE college course states: When the hours counter is reset, so is the flip-flop, making its Q output high. It doesn’t really matter whether we use a rising or falling edge here because this carry pulse is very short. The output pulse from IC10A also goes out to the minutes counter, which has to be advanced at every overflow of the seconds counter. IC4A divides the 1Hz pulse by You could try to separate components on the breadboard, but this increases lead inductance in the connecting wires which have to be longer.
So, everything should work as expected. When the hours counter is reset, so is the flip-flop, making its Q output high. The CLK input to the flip-flop is hdf4060, because the hours counter has just been reset to 0.
It also produces several other division ratios.
I have covered the time base and the counters here. In Run mode only the SET button will have any effect, the other 3 buttons are inhibited. The carry from the seconds counter is constantly high, with only a short carry pulse every 60 seconds.
HEF Datasheet, PDF – Alldatasheet
It also produces several other division ratios. It is spread over two sheets, one sheet covers the time base and the seconds, minutes and hours counters.
Next stop, the minutes counter. Due to large stray capacitance from datwsheet per contact pointhigh inductance of some connections and a relatively high and not very reproducible contact resistance, solderless breadboards are limited to operation at relatively low frequencies, usually less than 10 MHz, depending on the nature of the circuit.
Xatasheet need 1Hz, not 2Hz, to feed to our seconds counter. Lastly, the parasitic capacitance that the breadboard adds will affect the oscillator circuit, so you may have to adjust for this. It uses a This page will describe sheet one in detail, while the next page will describe sheet number two.
BrianCarlton Sorry, I already added the link to the datasheet in the first post, but it got lost somewhere. Both buttons have a debouncing capacitor in parallel to make sure that every button press results in just one pulse. Email Required, but never shown. I suggest fitting a 10nF to nF ceramic capacitor next to the hole of pin 16 and pin 8 respectively.
HEF DATASHEET EPUB DOWNLOAD
This allows you to advance the hours counter. Datasheet other sheet covers the display circuit and the power supply. See update, and thanks: Sign up using Facebook.