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| O.C.X.O |
| The abbreviation for "Oven Control Crystal Oscillator". Such an oscillator contains a thermistor sensing network that adjusts the output frequency, thereby allowing the frequency to remain constant over a specified temperature range. |
| OEM |
| The abbreviation for "Original Equipment Manufacture". |
| OSCILLATORS |
| A circuit or device that produces an alternating current of a specific frequency at its output terminals. |
| OUTPUT CURRENT |
| Is represented by IOL and IOH, which is the output current at VOL and VOH. |
| OUTPUT LOAD (FAN OUT) |
| The capacity of the oscillator to drive other devices. TTL devices are specified in the number of gates that can be driven; i.e., 10 TTL gates. CMOS outputs are specified in picoFarads (pF); i.e., 15pF or 50pF loads. |
| OUTPUT VOLTAGE |
| Is represented by VOL, which is the maximum voltage that output low will be and VOH, which is the minimum voltage that output high, will be. |
| OVERLAP TIME |
| The time, measured at 50% Vp-p, at which the two outputs of a complementary output ECL oscillator overlap. |