(PDF) NE555 Datasheet PDF | Diodes

Features: Datasheet pdf NE555/SA555/NA555 PRECISION TIMERS Descr iption These devices are precision timi ng circuits capable of producing accura te time delays or oscillation. In the t imedelay or monostable mode of operatio n, the timed interval is controlled by a single external resistor and capacito r network. In the astable mode of opera tion, the frequency and duty cycle can be controlled independently with two ex ternal resistors and a single external capacitor. The threshold and trigger le vels normally are two-thirds and one-th ird, respectively, of VCC. These levels can be altered by use of the control-v oltage terminal. When the trigger input falls below the trigger level, the fli p-flop is set, and the output goes high . If the trigger input is above the tri gger level and the threshold input is a bove the threshold level, the flip-flop is reset and the output is low. The re set (RESET) input can override all othe r inputs and can be used to initiate a new timing cycle. When RESET goes low, the flip-flop is reset, .

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