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| SECOND |
| The basic unit of measure of time, equivalent to "the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom". For our purposes, one "second" is 1/60th of a minute. |
| SINE WAVE |
| A periodic wave that can be represented by a sine curve. The amplitude of such a wave is a function of the sine of a linear quantity such as phase or time. |
| SMD |
| The abbreviation for "Surface Mount Device". |
| SQUARE WAVE |
| An alternating or pulsating current or voltage whose wave shape is square. |
| STABILITY |
| The maximum amount of frequency deviation of the oscillator. Stability includes the tolerance at 25oC; drift over operating temperature range; changes in input voltage; changes in load, shock, vibration; and aging. |
| STANBY CURRENT |
| Amount of current consumed by the oscillator when it is in its standby mode. |
| STANDBY FUNCTION |
| A control function similar to the Enable/Disable function. In this case, the oscillator actually stops oscillating. This type of oscillator draws less current than an Enable/Disable type oscillator (when both are in their disabled states). START-UP TIME: The period from the instant voltage is applied to the oscillator until the oscillator output is stabilized. |
| SUPPLY VOLTAGE |
| Voltage required for the oscillator to operate within specification. |
| SURFACE MOUNT |
| Refers to a package with pads that mount to the surface of the PCB. |
| SYMMETRY |
| A measure of the uniformity of the output waveform. |