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Old 22nd Oct 2020, 8:51 am   #1
LXSTEIN45
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Default MC14451 Oscillator pinout?

Hi folks, has anyone got a datasheet/pinout for this IC?

Every datasheet I have checked online refers to the 1445 which is a 14 pin device, not this one.

Thanks.
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Old 22nd Oct 2020, 10:33 am   #2
barrymagrec
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Default Re: MC14451 Oscillator pinout?

Not this is it? :- https://www.google.com/search?client...x-b-d&q=cd4551
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Old 22nd Oct 2020, 10:35 am   #3
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Default Re: MC14451 Oscillator pinout?

Sorry - got the wrong number.
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Old 22nd Oct 2020, 10:51 am   #4
Jon_G4MDC
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Default Re: MC14451 Oscillator pinout?

I suppose it is this

MC14451 Oscillator / 2^11 to 2^19 Divider / Buffered Duty Cycle Control

No luck with a pinout so far.
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Old 22nd Oct 2020, 11:16 am   #5
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Default Re: MC14451 Oscillator pinout?

Datasheet
Attached Files
File Type: pdf MC14451.pdf (630.1 KB, 39 views)
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Old 22nd Oct 2020, 7:40 pm   #6
LXSTEIN45
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Default Re: MC14451 Oscillator pinout?

Thanks for your help folks... Looks like the IC is duff. Got a clock signal but it directly drives the emitter of a biased transistor (I guess high impedance and there is no signal coming out of the pin.

So my next question... Has anyone got an MC14551 NOS

I can always emulated with a pic micro..
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Old 22nd Oct 2020, 9:46 pm   #7
Herald1360
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Default Re: MC14451 Oscillator pinout?

Could you use a 4060 (or two)? Still readily available.
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Old 23rd Oct 2020, 10:10 am   #8
LXSTEIN45
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Default Re: MC14451 Oscillator pinout?

Quote:
Originally Posted by Herald1360 View Post
Could you use a 4060 (or two)? Still readily available.
Maybe, although I am struggling to work out what these folks have done with the signal. They have connected pin 1(Q11) to pin 7 (Duty-cycle reset) but also pin Q15 to pin 6 (driver in).
Now according to the table, With a 32.768kHz xtal, DCR to Q11 gives 31.2nS @ 16Hz, but on the same table pin Q15 connected to pin 6 (Driver in) you get 31.2mS @ 1Hz. Does this mean every 1000mS we will get single pulse for 31nS from the DCC out pin?

I have to admit I am a bit confused about this!

Last edited by LXSTEIN45; 23rd Oct 2020 at 10:18 am.
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