Pin-out for SEI Quartz Oscillator
Hi,
I realise this might be a bit off-topic, but I'm hoping that this is the right audience. I have recently acquired an SEI brand quartz oscillator about which I'm hoping to get some information on the pin-out and the supply voltage. It is labelled as follows (with the bold text hand written onto the label): SEI QUARTZ OSCILLATORThe case is 1.4" by 1.0", and about 0.4" thick. On the bottom there are four pins in a rectangle 1.0" by 0.5". One of the pins is clearly ground and is directly connected to the case, the other three are isolated. Below is a poor diagram showing the layout:QC. 1260PART No. With G being the ground pin and A, B, & C being the other three. Pins G, B, & C show signs of having been soldered to in the past, pin A looks clean in this respect. So, any suggestions about pin-out or supply voltage? I'm guessing that it will be a 5 Volt part with a full swing on the output, maybe TTL-like. Thanks in Advance, Brian. |
Re: Pin-out for SEI Quartz Oscillator
Frequency is a bit high for TTL I would have thought, more likely a sine wave or just possibly ECL in which case be careful as the supply may be -5.2 volts.
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Re: Pin-out for SEI Quartz Oscillator
If one of the pins appears isolated from the ground pin, when checked with a low voltage resistance test, it is probably the AC coupled sinewave output pin. The package may also have a second, square-wave output, as is the case with a 10MHz CQXL SPXO I have here.
Ron |
Re: Pin-out for SEI Quartz Oscillator
1 Attachment(s)
These were reported-on in April 1969 in Wireless World (see Americanradiohistory website).
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Re: Pin-out for SEI Quartz Oscillator
1 Attachment(s)
The only data I can find is this for these Cathodeon packages.
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Re: Pin-out for SEI Quartz Oscillator
Hi G6Tanuki,
That's very helpful, thanks. Now I know it's operational parameters, I can go on guess at the pin out - there's only two possibilities after all. I'll start with +9 Volts on the pin diagonally opposite ground and look for the output as I wind the voltage up (watching the current). Cheers, Brian. |
Re: Pin-out for SEI Quartz Oscillator
Dave,
Thanks for the Cathodeon info. Such a variety of pin-outs! Nothing like to standardisation of today. Cheers, Brian. |
Re: Pin-out for SEI Quartz Oscillator
Hi,
I finally got round to testing and sorting this oscillator. It does work (which is always a worry for second hand stuff from a radio rally). At 9.0 Volts it draws between 3 mA and 8 mA on the pin diagonally opposite the ground pin. The output is a sinewave, centred on ground, with an amplitude of 2.9 Volts peak-to-peak when loaded only with the 'scope and 1.8 Volts peak-to-peak when loaded with 50 Ohms. The pin-out, viewed from above (like normal chips are): +------------------------+ | 4 = Ground ... Out = 3 | | 1 = N/C .. 9 Volts = 2 | +------------------------+ Strangely my bench PSU seemed unable to deliver a solid supply, loads of ripple - 840 mVolts! Even with a 47 nF polyester & a 470 pF polystyrene right across the pins the ripple only got down to 530 mVolts. Ah well, the output looked like a clean sinewave no matter what. Cheers, Brian. |
Re: Pin-out for SEI Quartz Oscillator
Don't assume 9v just because some cathodeon oscillators were. They were competitors and each produced a very wide range of options. 12v was common, so were 6v and 8v.
Check pin 1 for diode + series resistor to ground. it may be a voltage operated frequency trim (also optional) It's about 35 years since I last saw Dave Standring and the quartz folk at Times Mill. They were good people and they made very good stuff. David |
Re: Pin-out for SEI Quartz Oscillator
David,
I used 9 Volts because of what I read from the press release in post #4. I did actually start powering it up with 5 Volts and, because it drew only a few milliAmps, I felt happy winding it up to 9 Volts. Cheers, Brian. |
Re: Pin-out for SEI Quartz Oscillator
That's good. These things were made to order and the datasheet was like a menu, choose the frequency choose the supply voltage, choose the temp range.... All the model number seemed to tie down is the package size.
David |
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