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NE555 Datasheet(PDF) 6 Page - ARTSCHIP ELECTRONICS CO.,LMITED.
ARTSCHIP [ARTSCHIP ELECTRONICS CO.,LMITED.]
NE555 Datasheet(HTML) 6 Page - ARTSCHIP ELECTRONICS CO.,LMITED.
/ 18 page
NORMALIZED OUTPUT PULSE DURATION
TA-Free-Air Temperature -℃
PROPAGATION DELAY TIME
LOWEST VOLTAGE LEVEL
OF TRIGGER PULSE
Lowest Voltage Level of Trigger Pulse
| Data for temperatures below 0℃ and above 70℃ are applicable for SE555 series circuits only.
For monostable operation, any of these timers can be connected as shown in Figure 9. if the output is low, application of a
negative-going pulse to the trigger (TRIG) sets the flip-flop (
goes low), drivers the output high, and turns off Q1, Capacitor C
then is charged through RA until the voltage across the capacitor reaches the threshold voltage of the threshold (THRES) input. If
TRIG has returned to a high level, the output of the threshold comparator resets the flip-flop (
goes high), drives the output low,
and discharges C through Q1.
Pin numbers shown are for the D,JG,P,PS, and PW packages.
Figure 9. Circuit for Monostable Operation
Monostable operation is initiated when TRIG voltage falls below
the trigger threshold. Once initiated, the sequence ends only if
TRIG is high at the end of the timing interval. Because of the
threshold level and saturation voltage of Q1, the output pulse
duration is approximately t
=1.1RAC. Figure 11 is a plot of the
time constant for various values of RA and C. The threshold
levels and charge rates both are directly proportional to the
supply voltage, Vcc. The timing interval is , therefore,
independent of the supply voltage, so long as the supply
voltage is constant during the time interval.
Applying a negative-going trigger pulse simultaneously to
RESET and reinitiates the cycle, commencing on the positive
edge of the reset pulse. The output is held low as long as the
reset pulse is low. To prevent false triggering, when RESET is
low. To prevent false triggering, when RESET is not used, it
should be connected to Vcc.
Figure 10. Typical Monostable Waveforms
Figure 11. Output Pulse Duration vs Capacitance
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