frequency precision

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Have a kind of difficult question.

im looking for RTC chips for a micro controller project, i need an
accurat way of keeping time as well as interrupt alarms and can use
I2C or SPI for the application, my problem is understanding the
precision of these chips from there technical specification.

For example the sheet http://www.rapidonline.com/netalogue/specs/90-0398.pdf
Page 4, frequency characteristics shows 5 +- 23 * 10^-6. Just exaclty
how does one interpret this?

Any help is much appreciated.

Thanks for your time


Richard

 

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Thanks very much, got it now