Recommended pull-ups are 10k for 100kHz communication, about 2k2 for 400kHz comm
unication. Max. Io(L) for serial EEPROM does not exceed approx. 3mA (see e.g. Mi
crochip 24AAxxx types). If VCC=5V, min. pull-ups are 1k6.

Jan.

"Dr. Imre Bartfai" wrote:
>
> Hi,
>
> the pull-up should not exceed 4k7, for high-speed connection even 1k.
> Regards,
> Imre
>
> On Fri, 22 Oct 1999, Harry Febianto wrote:
>
> > Hi,
> > I am trying to write and read eeprom 24C16. However it does not work.
> > Did you ever did it ? I am using 16F84, 4MHz oscillator, SDA to RB7, SCL
> > to RB6. Using Resistor pull-up to Vcc, 22k in, in SDA and SCL. I think
> > the circuit is correct. I checked the voltage too.
> >
> > I followed the instruction in Application Notes AN567 and others,
> > modified it to run at  16F84. I just write and read 1 byte. However, my
> > 16F84 just read FF.
> >
> > Do you have any advises about it ? Is the algorithm wrong ? or Should I
> > buy the new eeprom?
> >
> > Thanks a lot for your help.
> >
> > Regards,
> > Harry
> >
> >