4-pin Crystal

These are oscillators, ie crystals + the required circuitry to make them oscillate. The pins are vcc, gnd, clock out and the last is not connected.

They orivide a good accuracy and can be used as a clock line for several chips.

vic

A crystal oscillator has power/gnd/out and possibly adjust or a no-connect. There are 4-connector surface mount crystals. Two opposite corners are the crystal and the other two seem to connect to the case (so you could ground it).

Three of them are: VCC, GND and OUTPUT.

Sometimes they have an ENABLE.

Thanks a lot folks! I couldn't find the datasheet for the 4-pin oscillators I have. Is there a general way to test which pin is which? I knew only one of them is connected to the case, and I don't want to blow it up by putting the power pin in the wrongest place.

other

no-connect.

Should be on Mouser.com

...

Most of these oscillators would fit in a 14 pin IC socket. Pin 1 is marked (sharp corner while others are rounded) and may be a control or enable input. Pin 7 is ground, 8 is output, and 14 is +5 volts.

Have a look at Digikey for oscillators - the package and pinout is common to most manufacturers.

cool..... thank you all :)

oscillators

one

putting