LMC555: minimum frequency possible to be generated with LMC555

Ramana Murthy

Expert 1765 points

Part Number: LMC555
Other Parts Discussed in Thread: LM555

Dear Sir,

I want to generate 1Hz frequency with 50% duty cycle

what is the minimum frequency possible to be generated with LMC555 (SOIC Package) in 50% duty cycle

Regards
Murthy

over 5 years ago

0 Ron Michallick over 5 years ago

TI__Guru**** 165846 points

Murthy,

1Hz is not the least bit low. 0.001Hz would be considered low. 1Hz is fine.

While not required in this case, it may be still helpful to read the a-stable timer FAQ.

e2e.ti.com/.../879112

0 Ramana Murthy over 5 years ago in reply to Ron Michallick

Expert 1765 points

Dear sir,

Thank you so much for your warm reply.

I go through all FAQ of LM555.

But I need one function that i want to Enable and Disable of LM555. BY Ov or 5V Signal.

Guide me how it can be implemented

Regards

Murthy

0 Ron Michallick over 5 years ago in reply to Ramana Murthy

TI__Guru**** 165846 points

Murthy,

The 0V,5V signal can be connected to the RESET pin. Note that the first output high pulse will be 59% longer than the pulses that follow. Figure 16 in the FAQ shows one method the keep all the pulse the same and allows turning the output stream on and off.

When RESET goes high, the output goes high to start the output clocking . When RESET goes low the output goes low immediately and stays low.

0 Ramana Murthy over 5 years ago in reply to Ron Michallick

Expert 1765 points

Dear Sir,

Thank you so much for your warm reply.

Once implementation done i will let you know.

Regards,

Murthy

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LMC555: minimum frequency possible to be generated with LMC555