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These devices are precision timing circuits capable of producing accurate time delays or oscillation. In the time-delay or monostable mode of operation, the timed interval is control°C by a single external resistor and capacitor network. In the astable mode of operation, the frequency and duty cycle can be control°C independently with two external resistors and a single external capacitor.
The threshold and trigger levels normally are two-thirds and one-third, respectively, of VCC. These levels can be altered by use of the control-voltage terminal. When the trigger input falls below the trigger level, the flip-flop is set, and the output goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level, the flip-flop is reset and the output is low. The reset (RESET) input can override all other inputs and can be used to initiate a new timing cycle. When RESET goes low, the flip-flop is reset, and the output goes low. When the output is low, a low-impedance path is provided between discharge (DISCH) and ground.
The output circuit is capable of sinking or sourcing current up
to 200mA. Operation is specified for supplies of 5V to 15V.
With a 5-V supply, output levels are compatible with TTL
The NE555, SA555 and NA555 are supplied in a small outline 8 pin package (SO-8).
Industry standard part number and specification
- Drop in replacement to alternative parts
- Vast amounts of free support available including cookbooks and calculators
Programmed by external resistors and capacitor
- Very simple to use. Allows easy programming into several different modes