admin 27 February, 2019 0


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.

Author: Faekasa Moogurr
Country: Benin
Language: English (Spanish)
Genre: Education
Published (Last): 11 October 2015
Pages: 145
PDF File Size: 1.95 Mb
ePub File Size: 14.47 Mb
ISBN: 276-5-73705-348-9
Downloads: 27795
Price: Free* [*Free Regsitration Required]
Uploader: Tygolrajas

I’ve added it again.


The Hours Counter And now the hours counter. It’s output Q0 of the first decade counter IC4A. OK, that’s enough for this one page. We haven’t talked about the carry from the seconds counter to heff4060 minutes counter yet. The precision of the resistor value has no effect on the precision of the time base B. Moreover, I think dafasheet if I have a 11MHz signal output on the pin 9, it should means that the oscillator is working The Q output will be used by the display part of the circuit to suppress the leading 0 of the hours counter.

It’ll give stiffness on ‘s supply lines and will give extra capacity to the to drive various parasitic capacitance on its outputs. Its signal level is constantly low, with only a very short rising pulse when the counter reaches 60 minutes.

This allows hef datasheet to advance the hours counter. Solderless breadboards are further limited by their voltage and current ratings. Now IC9D will inverse the pulses coming from the push button.


When the carry pulse goes high too, the output dayasheet IC9B goes low briefly. The Wikipedia Page on them states pF per contact pointhef4600 you may have far too much capacitance on your crystal.: The clock can be in one of two different modes, in Run mode or in Set mode.

We’ll have to tell the clock what time it is when it has lost all its power anyway. Otherwise the roll over of the minutes counter would advance datashfet hours counter datashert.

However, it would make changing the crystal somewhat more involved. Test at lower frequencies and see what happens.

While the clock is in SET mode there won’t come any carry pulses from the minutes counter and that signal is constantly high. This not only prevents the clock from advancing every minute during SET mode, it also starts counting a whole new minute once the clock is set to RUN mode again.

But when the most significant digit of the hours counter increments the clock input of the flip-flop rises, which sets the flip-flop, making the Q output low.

But I think that this could be a problem caused by the breadboard as apalopohapa said.

When the hours counter is reset, so is the flip-flop, making its Q output high. The output pulse from IC10A also goes out to the minutes hdf4060, which has to be advanced at every overflow of the seconds counter. Navigation How to navigate Sponsors Please consider clicking on the Support Me button to show your appreciation.



Axeman 3, 14 I suggest fitting a 10nF to nF ceramic capacitor next to the hole of pin 16 and pin 8 respectively. Lastly, the parasitic capacitance that the breadboard adds will affect the oscillator circuit, so you may have to adjust he4f060 this. BrianCarlton Sorry, I already added the link to the datasheet in the first post, but it got lost datasheett.

IC2 forms hef datasheet time base oscillator and first pre-scaler stage.

SB-Projects – Projects – CMOS Clock – Hardware

Sign up using Facebook. PeterJ 16k 20 42 See update, and thanks: And now the hours counter. One significant factor that most people neglect is the series parasitic inductance on the supply line.

I dahasheet 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.

It also produces several other division ratios. The relative high contact resistance can already be a problem for DC and very low frequency circuits.