20-101-0383 Rabbit Semiconductor, 20-101-0383 Datasheet - Page 51

• Manufacturer Part Number: 20-101-0383
• Description: MODULE RABBITCORE RCM2020
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-0383

• Module/board Type: MPU Core Module
• Product: Microcontroller Modules
• Core Processor: Rabbit 2000
• Clock Speed: 18.432 MHz
• Interface Type: Ethernet, Serial
• Flash: 256 KB
• Timers: 5 x 8 bit, 2 x 10 bit
• Operating Supply Voltage: 4.75 V to 5.25 V
• Board Size: 48.3 mm x 58.4 mm x 14 mm
• Core: RCM2020
• Processor Series: RCM2000
• For Use With/related Products: RCM2020
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1082

The values from the table above are derived using 55 ns (25.8 MHz version) and 90 ns
(18.4 MHz version) memory access times. External capacitive loading can be improved
by 10 pF for commercial temperature ranges, but do not exceed 100 pF. See the AC timing
specifications in the Rabbit 2000 Microprocessor User’s Manual for more information.
Figure A-4 shows a typical timing diagram for the Rabbit 2000 microprocessor memory
read and write cycles.
Figure A-4. Memory Read and Write Cycles
T
is the time required for the address output to reach 0.8 V. This time depends on the
adr
bus loading. A0 has a stronger driver and can handle larger capacitive loads than the other
address lines. T
is the data setup time relative to the clock. Tsetup is specified from
setup
30%/70% of the V
voltage level. Add 1.5 ns to T
for each 10 pF of additional bus
DD
adr
loading above 70 pF.
User’s Manual
47