Can a 74LS02 NOR package be used in place of a CD4001 NOR in an oscillator circuit?

TY

 

Can a 74LS02 NOR package be used in place of a CD4001 NOR in an oscillator circuit?

What is the power supply voltage? What will the oscillator be driving?

Please post a schematic so we can understand what you're talking about.

 

It depends which circuit is being used, what the power supply is and what load current is involved.

 

Depends. Show us a circuit diagram of the rest of the circuit.
Generally speaking, 7400 series TTL logic is not compatible with CMOS circuits.

 

Can a 74LS02 NOR package be used in place of a CD4001 NOR in an oscillator circuit?

The two parts switch at a different voltage. Most CMOS logic switches from 0/1 at 1/2 the supply voltage which is not "TTL" levels.
Also 74LSxx output has a week pull up.

It will probably will work.

 

The two parts switch at a different voltage. Most CMOS logic switches from 0/1 at 1/2 the supply voltage which is not "TTL" levels.
Also 74LSxx output has a week pull up.

It will probably will work.

Here is the schematic. Supply voltage is 5 volts.

 

Thanks for posting the circuit diagram. That certainly helps a lot.

If you are new to digital electronics, here are a few things you need to know.
I see in your circuit CD4001, 74161 and 7493 digital ICs.

Plain vanilla 7400, 7493, 74161, etc. are very old designs, are not used today in new designs and would be hard to find. If you already have stock then that is one possible reason to use them.

7400 series ICs were replaced by 74LS00 series a very long time ago. These consume less power. 74LS00 are available but not likely to be used in new designs.

74C00, 74HC00 and 74HCT00 series are more recent additions to the family (but still many years old) and are fabricated with CMOS structures. These consume very little power and some have wider range of supply voltages than the traditional 5V supply.

CD4000 and MC14000 series are CMOS digital families and are somewhat compatible with 74C00 and 74HC00 families. You can also find cross equivalents that would be pin compatible. For example, CD40161 would be the equivalent to 74161.

If you are in the process of buying and building up a stock of digital ICs, I would recommend staying with one family, for example, CD4000 series or 74HC00 series.

In your circuit, you are trying to divide a 32768Hz clock signal down to 1Hz. This means that you need a 15-stage counter. That doesn't necessarily mean that you must use a 7493 divide-by-8 stage. You can still use an extra 74161. But going even further, you ought to be looking at CD4020, CD4040, and CD4060 counter ICs.

CD4060, besides being a 14-stage counter, it has the oscillator circuitry included.

https://www.ti.com/lit/ds/symlink/cd4060b.pdf

 

Now, you have expressed a desire to get 1Hz signal from a 32768Hz quartz crystal.
If your project involves using a microcontroller, then you would not need a separate 1Hz clock. The MCU can generate 1Hz.

 

I would rather work with cmos because of all the advantages but is it not a pain dealing
with cmos because of static electricity, especially with solderless breadboard?
No microcomputer involved. I may not even build this circuit. At the present time I am
just researching.

 

Can a 74LS02 NOR package be used in place of a CD4001 NOR in an oscillator circuit?

TY

Generally speaking, the answer in no. The CMOS part is more adaptable to being biased into the linear region for use as an oscillator. That said you should consider using an unbuffered part as they have even more favorable characteristics for that application. The LSTTL part is not at all suitable for this purpose.

 

I would rather work with cmos because of all the advantages but is it not a pain dealing
with cmos because of static electricity, especially with solderless breadboard?
No microcomputer involved. I may not even build this circuit. At the present time I am
just researching.

If you are never going to build this then it does not matter what you choose since it will never be used.

Yes, CMOS is sensitive to static electricity along with all electronic components and devices, including your computer and smart phones. You just learn to take extra precautions when and where necessary and advised.

 

is it not a pain dealing
with cmos because of static electricity, especially with solderless breadboard?

I haven't found working with MOS parts on solderless breadboards to be much of a problem. Ground yourself before handling or use an ESD-strap.

If you're paranoid about ESD, get an insertion tool that can be grounded. Even without grounding, they would keep all of the pins at the same potential, so ESD isn't an issue.


I bought my set many years ago, but they're still available on eBay.

 

Can a 74LS02 NOR package be used in place of a CD4001 NOR in an oscillator circuit?

Maybe.

First, the impedance of the feedback network will have to be lower. For example, even if the crystal were a dead short, the 2.0 M net feedback resistance will not source nearly enough current to the input to cause any kind of action.

Second, the pinouts of the two parts are significantly different.

Note that everything in your schematic can be done with one CD4060 plus one extra divide-by-2 stage.

ak

 

The CF4060 IC has a built in XTAL oscillator and divider to get you down to 2hz all in one IC.
32768 to 1 link
On the 4060, pins 9,10,11 want to oscillate with a crystal or RC and the divider has 14 stages.