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TLC555-Q1 , Astable operation

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: TLC555-Q1

Hello,

I have the following questions about TLC555-Q1

1. EN function
Is the /RESET pin of TLC555-Q1 used for Enable pin?

2. OUTPUT state
Is the OUTPUT pin in Hi - Z state when not used or disabled?

3. Duty 25%, Frequency 40Hz
Why do we need to add a diode in parallel with R2 when the duty is 50% or less?

Best Regards,
Ryuji Asaka

  • 0
    TI__Genius 16410 points
    Hello Asaka-san,

    I've assigned this post to the appropriate applications engineer, she will respond to your question.

    Regards,
    Karl
  • 0
    TI__Mastermind 28340 points

    1- Yes the RESET pin can be used as enable. RESET is low and the output is low. RESET is high the output is switching.

    2- The output is not a Hi-Z. It is high or low.

    3- What R2 you are referring to? are you referring to figure 6 in Q1 datasheet? diode in parallel with Rb helps to discharge faster the timing capacitor and this may be used to achieve higher duty cycle. The high level duration is proportional to Ra + Rb and the low level duration in proportional to only Rb

    I hope this answers your questions