101-1157 Rabbit Semiconductor, 101-1157 Datasheet - Page 79

• Manufacturer Part Number: 101-1157
• Description: KIT DEVELOPMENT USA RCM4100
• Manufacturer: Rabbit Semiconductor
• Series: RabbitCore 4000r
• Type: MPU Moduler

Specifications of 101-1157

• Contents: RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
• Processor To Be Evaluated: Rabbit 4001
• Data Bus Width: 8 bit
• Interface Type: SPI
• For Use With/related Products: RCM4100
• Lead Free Status / RoHS Status: Lead free / RoHS compliant by exemption
• Other names: 316-1123

A.3 I/O Buffer Sourcing and Sinking Limit
Unless otherwise specified, the Rabbit I/O buffers are capable of sourcing and sinking
8 mA of current per pin at full AC switching speed. Full AC switching assumes a
29.4 MHz CPU clock with the clock doubler enabled 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 3.6 V.
A.4 Bus Loading
You must pay careful attention to bus loading when designing an interface to the
RCM4100 series of modules. This section provides bus loading information for external
devices.
Table A-5 lists the capacitance for the various RCM4100 I/O ports.
Table A-6 lists the external capacitive bus loading for the various RCM4100 series 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-6.
User’s Manual
Table A-6. External Capacitive Bus Loading -40°C to +85°C
Parallel Ports A to E
All I/O lines with clock
doubler enabled
Output Port
Table A-5. Capacitance of Rabbit 4000 I/O Ports
I/O Ports
Clock Speed
(MHz)
58.98
Capacitance
Input
(pF)
12
Capacitive Loading (pF)
Maximum External
Capacitance
100
Output
(pF)
14
75