Single Precision Timer

The Nx555 and Sx555 devices are

precision timing circuits capable of producing accurate time delays or oscillation.

In time-delay or monostable operating modes, the timed interval is controlled by a

single external resistor and capacitor network. In the astable mode of operation,

the frequency and duty cycle are controlled independently with two external

resistors and a single external capacitor.

Each timer has a trigger level equal to approximately one-third of the supply voltage

and a threshold level equal to approximately two-thirds of the supply voltage. These

levels can be altered by use of the control voltage pin (CONT). When the trigger

input (TRIG) is less than the trigger level, the flip-flop is set and the output

goes high. If TRIG is greater than the trigger level and the threshold input (THRES)

is greater than the threshold level, the flip-flop is reset and the output is low.

The reset input (RESET) overrides all other inputs and is used to initiate a new

timing cycle. If RESET is low, the flip-flop is reset and the output is low.

Whenever the output is low, a low-impedance path is provided between the discharge

pin (DISCH) and the ground pin (GND). Tie all unused inputs to an appropriate logic

level to prevent false triggering

The output circuit is capable of

sinking or sourcing current up to 200mA. Operation is specified for supplies of 5V

to 15V. With a 5V supply, output levels are compatible with TTL inputs.