On Sunday 28 Sep 2003 8:16 am, you wrote:
> Last post on this thread:
>
> The mc1489 datasheet that I have is from on semiconductor.

Funnily enough, so is mine.
>
> 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).

I must confess I had not read this far in the data sheet.  However, mine only
shows an example of using the control pin as an input via an 80K resistor and
makes no reference as to how this might alter the hysteresis.  Can you give
me a URL reference to your data sheet?
>

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

I am happy to agree that a larger hysteresis is preferable, especialy in the
presence of noise.

Ian

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