The standard TTL 555 can operate from a supply voltage between 4.5 volts and 18 volts, with its output voltage approximately 2 volts lower than its supply voltage V CC. The two 555 timers within the 556 operate independently of each other but share a common V CC supply and ground (0V) connection. As the 555 timer is one of our favourite, cheapest and easily configurable chips, let’s look at using it to create some different 555 circuits.Īs we have seen previously, the 555 timer comes as a single device within an 8-pin dual-in-line package (DIP) or as the 556 device which has two 555 chips in a single 14-pin dual-in-line package. We have seen in the last few tutorials that the 555 Timer can be configured with externally connected components as multivibrators, oscillators and timers, with timing intervals ranging from a few microseconds to many hours.
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