Oscillators, their pins and sockets.

[rjd324]

There are many different oscillators and they all have different amounts of pins. The same for the sockets in which they fit.

1. I would like to know if a 50MHz crystal with 8 pins behaves exactly the same as a 50MHz crystal with 14 pins. I would guess so.

2. The Aca 1233 has the FPU crystal with 6 through holes, so is the only option a cyystal with 6 pins connected to a 6 pin socket? Or, could I use a 4 pin and miss out the middle pins?

[hooverphonique]

Generally, those types of oscillators have 4 terminals in either a DIP8 or DIP14 form factor, and can be interchanged if you account for the form factor.

Are you sure the ACA actually has a 6 terminal oscillator?

NB. Be careful about mixing the terms oscillator and crystal - a crystal usually has 2 terminals and doesn't oscillate on its own, whereas an oscillator will oscillate when you apply a voltage to the power terminals.

[rjd324]

Hello,

thanks for the reply.

https://www.vesalia.de/pic/aca1233n.jpg

You can see that there are 6 pins (u13) - but that part is partitioned, so I am not sure about that. Maybe you can help?

In summary I want to know what I need to put a 50MHz oscillator on there...

[rjd324]

Actually, I think my confusion is mainly due to this:
http://amigakit.amiga.store/product_...roducts_id=415

So, the socket accepts N number of legs. But, the socket - itself - has 4 legs: is this always the case with these sockets?

[Vypr]

Originally Posted by rjd324

Actually, I think my confusion is mainly due to this:
http://amigakit.amiga.store/product_...roducts_id=415

So, the socket accepts N number of legs. But, the socket - itself - has 4 legs: is this always the case with these sockets?

Yes, it's just a standard DIL socket with most of the legs removed.

[hooverphonique]

Originally Posted by rjd324

Hello,

thanks for the reply.

https://www.vesalia.de/pic/aca1233n.jpg

You can see that there are 6 pins (u13) - but that part is partitioned, so I am not sure about that. Maybe you can help?

In summary I want to know what I need to put a 50MHz oscillator on there...

To me that just looks like a pcb footprint that accommodates both sizes (DIP8 or DIP14), and they are interchangeable. If you have a multimeter, you can use the continuity test to check whether I'm right (if two of the pins correspond to two other pins).

[Nightshft]

Most Oscillators are in size DIL8 or DIL14 (as far as I know).
They have 4 electrical pins (Vss, Ground, Signal out and NC (not connected)).

I just soldered an Oscillator in size DIL8 onto the 1233 and it works fine.
I only had a DIL8 at home and was happily surprised both sizes fit.

I'm quite sure the other configuration fits for DIL14, also with 4 pins and you leave out the 2 pins in the middle.

Edit:
So to answer your question directly: Yes it's only 4 pins and the 6 holes are just for 2 different package sizes and when using the bigger package the two middle holes are left out (If I'm not totally wrong as I only tested the small package size. Also the pcb markings indicate that).

[cpiac64]

Dil8 and Dil14 are for 68882

the aca work with another 4 pin and multiplier