SA555: Trigger hold time

Takumi Suzuki1

Mastermind 8610 points

Part Number: SA555

Hi,

I would like to ask you a question about the hold time of "trigger" signal.

In case the timing of "Reset off" and "Trigger on(low)" is the same, how long should we hold the trigger low time?

Will you tell me the min value of it? (**uSec)

I have attached the timing chart, please confirm it.

Thank you for your support.

Best Regards,

Takumi

SA555 timing.pdf

over 3 years ago

+1 Chris Featherstone over 3 years ago

TI__Mastermind 25060 points

Hello,

Please see the table below. Let me know if I can be of further assistance.

Best Regards,

Chris Featherstone

0 Takumi Suzuki1 over 3 years ago in reply to Chris Featherstone

Mastermind 8610 points

Hello Chris-san,

Thank you for your reply !

I understood that the min value of trigger is "1uSec" at SA555, is this correct?

That is to say, after disable "RESET" (=H), we must keep 1uSec "L".

And will you give me the document which includes the table you showed me?

Best Regards,

Takumi

+1 Chris Featherstone over 3 years ago in reply to Takumi Suzuki1

TI__Mastermind 25060 points

Hi Takumi-san,

Yes the trigger needs to be held for 1us minimum after reset is high. The document is under the frequently asked questions for monostable operation found here:

https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/857914/faq-how-do-i-design-monostable-timer-circuits-using-lmc555-tlc555-lm555-na555-ne555-sa555-or-se555

Best Regards,

Chris Featherstone

0 Takumi Suzuki1 over 3 years ago in reply to Chris Featherstone

Mastermind 8610 points

Chris-san,

Thank you for your reply !

I understood.

Best Regards,

Takumi

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SA555: Trigger hold time