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The mc1489 datasheet that I have is from on semiconductor.

The hysteresis can be increased significantly by using the compensation
pin as input, with a ~7k series input resistor. The datasheet suggests
this too (in the application section). This would give a hysteresis of
about 7V, suitable for full drive RS232 signals (+/-12V).

Having a small hysteresis with low slew rate signals is worse than having
none, in the presence of noise ime ;-)

Peter

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