LM555J/883 National Semiconductor, LM555J/883 Datasheet - Page 10
LM555J/883
Manufacturer Part Number
LM555J/883
Description
IC,TIMER,BIPOLAR,DIP,8PIN,CERAMIC
Manufacturer
National Semiconductor
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Applications Information
50% DUTY CYCLE OSCILLATOR
For a 50% duty cycle, the resistors R
nected as in Figure 14 . The time period for the output high is
the same as previous, t
is t
Thus the frequency of oscillation is
2
=
1
= 0.693 R
A
C. For the output low it
A
and R
(Continued)
B
may be con-
10
Note that this circuit will not oscillate if R
R
down to 1/3 V
ADDITIONAL INFORMATION
Adequate power supply bypassing is necessary to protect
associated circuitry. Minimum recommended is 0.1µF in par-
allel with 1µF electrolytic.
Lower comparator storage time can be as long as 10µs
when pin 2 is driven fully to ground for triggering. This limits
the monostable pulse width to 10µs minimum.
Delay time reset to output is 0.47µs typical. Minimum reset
pulse width must be 0.3µs, typical.
Pin 7 current switches within 30ns of the output (pin 3) volt-
age.
A
because the junction of R
FIGURE 14. 50% Duty Cycle Oscillator
CC
and trigger the lower comparator.
A
and R
B
B
cannot bring pin 2
is greater than 1/2
DS007851-18