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Datasheet of 20-101-1194 - MODULE RABBITCORE RCM3309 ROHS
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A.2 Bus Loading
You must pay careful attention to bus loading when designing an interface to the
RCM3309/RCM3319. This section provides bus loading information for external devices.
Table A-2 lists the capacitance for the various RCM3309/RCM3319 I/O ports.
Table A-2. Capacitance of Rabbit 3000 I/O Ports
I/O Ports
Parallel Ports A to G
Table A-3 lists the external capacitive bus loading for the various RCM3309/RCM3319
output ports. Be sure to add the loads for the devices you are using in your custom system
and verify that they do not exceed the values in Table A-3.
Table A-3. External Capacitive Bus Loading -40°C to +85°C
Output Port
All I/O lines with clock
doubler enabled
User's Manual
Input
Capacitance
(pF)
12
Clock Speed
Maximum External
(MHz)
Capacitive Loading (pF)
44.2
Output
Capacitance
(pF)
14
100
73
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