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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-8 shows the AC and DC output drive limits of the parallel I/O buffers when the
Rabbit 3000 is used in the RCM3400.
Table A-8. I/O Buffer Sourcing and Sinking Capability
Output Drive (Full AC Switching)
Pin Name
Sourcing/Sinking Limits
(mA)
All data, address, and I/O
Sourcing
Sinking
lines with clock doubler
6.8
6.8
enabled
Under certain conditions, the maximum instantaneous AC/DC sourcing or sinking current
may be greater than the limits outlined in Table A-8. The maximum AC/DC sourcing cur-
rent can be as high as 12.5 mA per buffer as long as the number of sourcing buffers does
not exceed three per V DD or V SS pad, or up to six outputs between pads. Similarly, the
maximum AC/DC sinking current can be as high as 8.5 mA per buffer as long as the num-
ber of sinking buffers does not exceed three per V DD or V SS pad, or up to six outputs
between pads. The V DD bus can handle up to 35 mA, and the V SS bus can handle up to
28 mA. All these analyses were measured at 100°C.
User ’s Manual
67
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