> the problem is the current o/p of the port 1 is
> 6.50milliamps and the requirement of the
> 7segment display is 15ma

Try transistors (voltage-follower circuit) for each load. It means: connect collector to power supply, ground emitter through current-limiting resistor and load, and base will be the input (current limiting resistor, usually about 10 kOhm, may be also required). One should use a NPN transistor for negative ground, which is a common case.

Transistor type is determined only by maximum forward collector current, as while in switch mode, very little power is lost in transistor itself. Switching time does little matter, because you have (if I understand right) a statically driven display.

==
Tomas