NE555: Min Pulse Width Needed to Initialize Timer

Matt Calvo

Part Number: NE555

Hey Clock and Timing team,

I have a customer evaluating the NE555 timer in monostable operation for a new project and we would like to know what the minimum pulse width for TRIG (Pin 2) is needed to initialize the timer. Is this something that is characterized or specified in the datasheet?

In their application the pulse width can be as short as 5us so we are trying to determine if that would work. If not, do you have any other circuit recommendations?

Let me know if you have any questions!

Best regards,

Matt Calvo

over 1 year ago

+1 Zach Olson over 1 year ago

TI__Genius 11795 points

Hi Matt,

According to page 10 of the NE555 datasheet, the minimum pulse width is 10μs.

If your requirements specify a pulse width of 5μs, I recommend the TLC555 timer which has a minimum pulse width of 1μs (see page 13 of TLC555 datasheet).

Regards,

Zach

0 Matt Calvo over 1 year ago in reply to Zach Olson

TI__Genius 14755 points

Thanks for the info and advice Zach!

I'll be sure to pass this along to the customer and will have them comment back on here directly with any follow-up questions they may have.

-Matt Calvo

Clock & timing

Clock & timing forum

NE555: Min Pulse Width Needed to Initialize Timer