LMC555: LMC555CMMX/NOPB

Hello, 

The control pin should always be connected with a capacitor to ground if it is not being driven. The control pin is connected to the threshold comparator internally and adding the capacitor will low pass filter the comparator input in order to provide predictability and reject noise that would otherwise have the potential to trip the comparator. Unfortunately there isn't a model for this device. The TLC555 does have a more modern model however and can be used for high level design sim. 

Best Regards, 

Chris Featherstone

Hello, 

To follow up I wanted to provide one other resource. One of our engineers put together this FAQ page that has additional information as well that isn't in the product datasheets. 

https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/879112/faq-how-do-i-design-a-stable-timer-oscillator-circuits-using-lmc555-tlc555-lm555-na555-ne555-sa555-or-se555

He also did one for monostable and PWM if you ever need to do a design with those configurations. 

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

https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/906800/faq-how-do-i-design-a-pulse-width-modulator-pwm-circuit-using-lmc555-tlc555-lm555-na555-ne555-sa555-or-se555

Best of luck with your design and let us know if we can be of further assistance. 

Best Regards, 

Chris Featherstone