which is which?

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Vasile Surducan
Sent: 23 October 2001 07:31
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: 16F877 - Why two sets of power pins?


analogic and digital section.
Vasile

On Tue, 23 Oct 2001, Bala Chandar wrote:

> While using the 16F877, I have been connecting only one set of power
supply
> pins (+5V and Gnd to pins 32 & 31) and haven't faced any problems so far.
>
> Sometime back, someone in this list had asked why there are two Vdd and
two
> ground pins in 16F877. I was under the impression that it is there merely
to
> ensure pinout compatibility with 28 pin devices, so that the socket in the
> programmer is suitable for both.
>
> But when I checked with the multimeter, I was surprised to find a
resistance
> of around 2.5 ohms between the two Vdd pins (11 & 32) and the two ground
> pins (12 & 31). If the two pins are internally connected, should not the
> resistance be zero ohm? Or is it necessary to tie both the pins together
for
> some reason?
>
> Any comments?
>
> Regards,
> Bala
>
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