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LMX2820: Max SPI rate

Part Number: LMX2820
Other Parts Discussed in Thread: LMX2594

Is there any chance the LMX2820 can run at 50MHz? The datasheet specifies 40MHz max but the test conditions state 1/(tCWL + tCWH) which is 50MHz

Is there any margin in this specification? Also, the LMX2594 runs at 75MHZ write with a condition that tCWL + tCWL > 13.33nsec (75Mhz) so the two specs are confusing.