I have an application for a timer signal that generates very short pulses, was wondering if you knew how short you could get a stable signal from the 555, given highest frequency and shortest duty cycle; and what the frequency range of a 555 is.... and if you had already posted a schematic, can you give me a link? I tried search for 555, but couldn't even get to a page that mentioned 555.
555 Timer
I have an application for a timer signal that generates very short pulses, was wondering if you knew how short you could get a stable signal from the 555, given highest frequency and shortest duty cycle; and what the frequency range of a 555 is.... and if you had already posted a schematic, can you give me a link? I tried search for 555, but couldn't even get to a page that mentioned 555.
the cmos version is much faster than the bipolar version.
up to 3 MHz for the cmos version as shown in the datasheet http://www.ti.com/lit/ds/symlink/lmc555.pdf
the cmos version is much faster than the bipolar version.
and what's the shortest duty cycle? 3Mhz is 333ns for a full cycle....Quote from bussi04 on November 14th, 2012, 03:03 AM up to 3 MHz for the cmos version as shown in the datasheet http://www.ti.com/lit/ds/symlink/lmc555.pdf
the cmos version is much faster than the bipolar version.
nevertheless you are not totally free because frequency and duty controlled by a single C and R influence each other.
for exact values you have to try. If your duty gets too high or low the pulse will stop immediately because charge/discharge dynamics come to an end.
I have an application for a timer signal that generates very short pulses, was wondering if you knew how short you could get a stable signal from the 555, given highest frequency and shortest duty cycle; and what the frequency range of a 555 is.... and if you had already posted a schematic, can you give me a link? I tried search for 555, but couldn't even get to a page that mentioned 555.
Not sure if this is what you are looking for.
See attachment.
element 119
This is page from Forrest M. Mims III Engineer’s Mini-Notebook.Quote from d3x0r on November 13th, 2012, 08:39 PM I have an application for a timer signal that generates very short pulses, was wondering if you knew how short you could get a stable signal from the 555, given highest frequency and shortest duty cycle; and what the frequency range of a 555 is.... and if you had already posted a schematic, can you give me a link? I tried search for 555, but couldn't even get to a page that mentioned 555.
Not sure if this is what you are looking for.
See attachment.
element 119
I'm working on a replication of Dally's Replication of TK's generators.... it is for a worthy cause :)
I really just need to know in practice, and since Russ has such a thing already configured, if not destroyed already :-/ ... Just need to tune it down with a scope attached. I have a TL-494 that operates similarly, but minimum pulse is 200ns (and only a few hundred Khz, so the 555's better there...) but below that, and I don't get a real output, it's sometimes not there, and soemtimes is there.Quote from element 119 on November 14th, 2012, 07:29 PM This is page from Forrest M. Mims III Engineer’s Mini-Notebook.Quote from d3x0r on November 13th, 2012, 08:39 PM I have an application for a timer signal that generates very short pulses, was wondering if you knew how short you could get a stable signal from the 555, given highest frequency and shortest duty cycle; and what the frequency range of a 555 is.... and if you had already posted a schematic, can you give me a link? I tried search for 555, but couldn't even get to a page that mentioned 555.
Not sure if this is what you are looking for.
See attachment.
element 119
I'm working on a replication of Dally's Replication of TK's generators.... it is for a worthy cause :)