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CY2291 Process Variation and Voltage/Temperature Stability

CY2291 Process Variation and Voltage/Temperature Stability

GrBa_3991371
Level 1
Level 1
‎Jul 17, 2019 11:45 AM
‎Jul 17, 2019 11:45 AM
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I am having a problem in production where the frequency output of the CY2291 is outside previously established tolerances.  I am trying to calculate what the realistic tolerances should be following the discussion in https://www.cypress.com/file/42656/download.  In order to do this, I need to know the process variation and voltage/temperature stability of the CY2291 (this is not listed in the datasheet).  Can anybody provide these numbers?

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Re: CY2291 Process Variation and Voltage/Temperature Stability

PradiptaB_11
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500 replies posted 250 solutions authored 250 replies posted
In response to GrBa_3991371
‎Jul 23, 2019 12:26 AM
‎Jul 23, 2019 12:26 AM
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Hi Greg,

The crystal you are using has a frequency tolerance of 20 ppm and temperature stability of 50 ppm as mentioned by you. For worst case our device can have internal Capacitance of 16.15 which takes the the limit to 37 ppm as mentioned by you and temperature stability as mentioned is 5 ppm. So total error which can be induced will be 112 ppm.

Thanks,

Pradipta.

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