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TLC555: Minimum frequency in Astable Operation

Part Number: TLC555

Hi Team,

My customer is evaluating TLC555, and they want to set frequency in Astable Operation down to 1Hz.
The TLC555 datasheet, page 18, Figure 15. Free-Running Frequency vs Timing Capacitance, shows minimum 10Hz.
Q1: Is it possible to down to 1Hz in Astable Operation?
       If it is possible, what is the recommended capacitance value?

Q2: They tried the 10Hz frequency setting first.
       At the beginning after power-on, the frequency was almost 10Hz (T=90ms), but it became higher (T=80ms) after a day.
       Is that a issue of constant value setting of external R & C parts?
       Or, is that a normal operation of the TLC555 at the 10Hz setting?

Thank you.

Best Regards,

Koshi Ninomiya