![]() ![]() For bipolar timers, a is required because of current surges during output switching. (Note: CMOS timers have a lower minimum voltage rating, which varies depending on the part number.) See the supply min and max columns in the. ![]() ![]() 8 14 V CC Power Positive supply: the guaranteed voltage range of bipolar timers is typically 4.5 to 15 Volts (some timers are spec'ed for up to 16 Volts or 18 Volts), though most will operate as low as 3 Volts. 7 1,13 DISCH Output Discharge: this is an (O.C.) output (CMOS timers are open-drain), which can be used to discharge a between intervals, in phase with output. 6 2,12 THRES Input Threshold: when the voltage at this pin is greater than the voltage at CONT pin ( 2⁄ 3 V CC except when CONT is driven by an external signal), then the timing (OUT high) interval ends. This control pin input can be used to build an astable multivibrator with a frequency-modulated output. In most applications this pin is not used, thus a 10 ( or ) should be connected between this pin and GND to ensure electrical noise doesn't affect the internal voltage divider.
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