Andy Kunz wrote:
> On the data sheet for the '77-ME chip, they have separate pins for Analog
> Gnd (labeled AVss) and Analog power (AVdd).  Curiously, they are not
> labeled as such on the '74-ME data sheet.  And they are on opposite sides
> of the chip, too, which is curiouser and curiouser.
>
Texas Instruments used to package their logic with multiple ground and
power pins centred on the package (much like the '74).  This allows
shorter trace runs to the decoupling capacitors (instead of the 5.5cm
runs required in a 40 pin DIP).
--Matt