User`s manual

User’s Manual 67
A.4 I/O Buffer Sourcing and Sinking Limit
Unless otherwise specified, the Rabbit I/O buffers are capable of sourcing and sinking
6.8 mA of current per pin at full AC switching speed. Full AC switching assumes a
29.4 MHz CPU clock and capacitive loading on address and data lines of less than 70 pF
per pin. The absolute maximum operating voltage on all I/O is 5.5 V.
Table A-6 shows the AC and DC output drive limits of the parallel I/O buffers when the
Rabbit 3000 is used in the RCM3200.
Under certain conditions, you can exceed the limits outlined in Table A-6. See the Rabbit
3000 Microprocessor User’s Manual for additional information.
Table A-6. I/O Buffer Sourcing and Sinking Capability
Pin Name
Output Drive (Full AC Switching)
Sourcing/Sinking
Limits
(mA)
Sourcing Sinking
All data, address, and I/O
lines with clock doubler
enabled
6.8 6.8