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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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22nd Oct 2020, 9:51 am | #1 |
Hexode
Join Date: Dec 2009
Location: South Manchester, UK.
Posts: 262
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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. |
22nd Oct 2020, 11:33 am | #2 |
Octode
Join Date: Dec 2017
Location: Morden, Surrey, UK.
Posts: 1,552
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Re: MC14451 Oscillator pinout?
Not this is it? :- https://www.google.com/search?client...x-b-d&q=cd4551
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22nd Oct 2020, 11:35 am | #3 |
Octode
Join Date: Dec 2017
Location: Morden, Surrey, UK.
Posts: 1,552
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Re: MC14451 Oscillator pinout?
Sorry - got the wrong number.
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22nd Oct 2020, 11:51 am | #4 |
Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,013
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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. |
22nd Oct 2020, 12:16 pm | #5 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,324
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Re: MC14451 Oscillator pinout?
Datasheet
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22nd Oct 2020, 8:40 pm | #6 |
Hexode
Join Date: Dec 2009
Location: South Manchester, UK.
Posts: 262
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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.. |
22nd Oct 2020, 10:46 pm | #7 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,527
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Re: MC14451 Oscillator pinout?
Could you use a 4060 (or two)? Still readily available.
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23rd Oct 2020, 11:10 am | #8 |
Hexode
Join Date: Dec 2009
Location: South Manchester, UK.
Posts: 262
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Re: MC14451 Oscillator pinout?
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 11:18 am. |