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The LM555 is a highly stable controller capable of producing accurate timing pulses. With a monostable operation, the delay is controlled by one external resistor and one capacitor. With astable operation, the frequency and duty cycle are accurately controller by two external resistors and one capacitor.
Full Technical Data Sheet is available in PDF format.
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Number of Pins: 8
Row-to-Row Spacing: 0.300" (7.62mm)
Pin Spacing: 0.1" (2.54mm)
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Adjustable Duty Cycle and Frequency