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SN65C3243: VINH/VINL Thresholds

Part Number: SN65C3243

Hi Team,

According to Figure 5 in the datasheet, it says the specs were only tested at 5KHz.  Will the thresholds change if my customer is running faster?

Their typical RS-232 thresholds are +/-3V.  Does the +/- 2.7V only apply to the shutdown function?

 Is the +/-2.7V the correct number we should be using for the Vinh and Vinl?