Clock generator using LM2903-Q1

Tomohiro-san,

I do not think slew rate is the critical factor. I don't have any data on slew rate. Keeping capacitance on Vo node low will help slew rate , rise and fall times.

Propagation delay will be a more important factor. The characterization data shows a +/-10% variance in 5mV overdrive propagation delay, device to device. Across temperature is a different story. At 125C the delay increases by 63%. At -40C the delay decreases -26%

The overdrive in this application is time dependent. Increased overdrive lessens prop delay, however the overdrive also increases the peak to peak voltage on the capacitor which reduces frequency compared to the theoretical calculation.

Ron-san

Thank you for quick response.

I understand propagation delay is important factor of IC.

Calcurating the variance of temperature factor only,the variance of propagation delay is ＋63%/-26% at 5mV overdrive(1.3us typ). 

The variance of propagation delay @ 5mV is +0.819us(=1.3us×63%)/-0.338us(=1.3us×26%)

If set frequency to 51.2kHz(≒19.53us), laugh estimate of  frequency is <+8.3%(≒0.819us×2/19.53us)/-3.46%(≒-0.338us×2/19.53us)

Is it correct?

Regards

Tomohiro Nagasawa