> -----Original Message-----
> From: Olin Lathrop [SMTP:olin_piclist@EMBEDINC.COM]
> Sent: Thursday, February 28, 2002 12:27 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]: I2C Questions
>
> > Check the datasheet of an 82B715.
> > This is an I2C driver which has low Z outputs and can
> > drive quite some current.
>
> If you're saying it drives actively high instead of just low, then that is
> non-standard.  Some IIC bus function rely on the passive pullup
> configuration, like clock stretch.
>
The 82B715 has open collector outputs and still requires the use of pull-up
resistors but effectively provide current amplification for the device it is
buffering.  They have to be used at each node.

Mike

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