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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 RCM3209/RCM3229.
Table A-6. I/O Buffer Sourcing and Sinking Capability
Pin Name
All data, address, and I/O
lines with clock doubler
enabled
Under certain conditions, you can exceed the limits outlined in Table A-7. See the Rabbit
3000 Microprocessor User's Manual for additional information.
User's Manual
Output Drive (Full AC Switching)
Sourcing/Sinking Limits
(mA)
Sourcing
6.8
Sinking
6.8
63
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