by KMoffett » Wed Dec 24, 2014 7:07 pm
Googled: LMC6555 spice model 3MHZ
Depends on your simulator
[url]http://www.ti.com/product/tlc555[/url] There are spice models for the TLC555 that go up to 2MHz for several simulators
[url]http://www.ti.com/tool/tina-ti[/url]3MHz LMC555 for Tina-TI
[url]http://www.electronics-related.com/sci.electronics.design/thread/243924/new-555-spice-model.php[/url] from Jim Thompson
You can check for more.
Ken