Hello,
I have a CMOS (3.3V) signal that goes high for an indeterminate amount of time. This signal is telling me if there is data present or not on my bus.
I need a circuit go high when my signal goes high but I need it to stay high for an additional…
Other Parts Discussed in Thread: LMC555 , NE555 , LM555 , NA555 , TLC551 , SE555 , TLC552 , TLC555 , SA555 , CD4060B , CD4024B , CD4040B , CD4020B What is the difference between the part numbers?
How is the output frequency and duty cycle set?
Why is the actual frequency…
Khio,
I start with this simplified equation for NE555 or LM555 astable timers to pick initial resistors and capacitor values.
For application above 80 kHz or those that need more accuracy, I suggest TLC555, LMC555 (or TLC551).
Wang,
I confirmed your observation on LMC555.
I tested other Texas Instrument timers.
Device
Max Control
TLC555
12.8 V
TLC551
12.6 V
NE555
12.4 V
LM555
12.1 V
LMC555
11.5 V
VCC was 12.4V , Threshold ramp up to 13.5V
TLC555 is the recommended…
Other Parts Discussed in Thread: LMC555 , NE555 , LM555 , NA555 , TLC551 , SE555 , TLC552 , TLC555 , SA555 , CD74HC4060 , SN74LV8154 This FAQ covers mono-stable circuits using the LM555, NA555, NE555, SA555, and SE555 timers that are called LM, NA, NE, SA, and SE…
This FAQ covers PWM circuits. Figure 1 below shows a pulse width modulator using the LM555 , NA555 , NE555 , SA555 and SE555 timers that are called LM, NA, NE, SA and SE respectively hereafter. As a group they are called bipolar timers due to their design. This…
Ravi,
There are general purpose logic timers here. http://www.ti.com/lsds/ti/logic/monostable-multivibrator-products.page
NE555 has newer versions, TLC555, and TLC551.
