Is the CMOS output of a device operating on a low voltage connected directly to a device operating on a high voltage?
For example, if the output of a device operating on 3.3 V or 2.5 V is input to a device operating on 5 V, a sufficiently high level cannot be obtained even if the output of the device operating on a low voltage is pulled up to 5 V by using a pull-up resistor. Moreover, the output buffer of the device operating on a low voltage must have a tolerance of at least 5 V; otherwise the characteristics may degrade, causing defects after shipment. Be sure that the output buffer of the device operating on a low voltage is an open-drain buffer with a tolerance of at least 5 V.
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