20-101-0404 Rabbit Semiconductor, 20-101-0404 Datasheet - Page 50

• Manufacturer Part Number: 20-101-0404
• Description: MODULE RABBITCORE RCM2000
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-0404

• Module/board Type: MPU Core Module
• Product: Microcontroller Modules
• Core Processor: Rabbit 2000
• Clock Speed: 25.8 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: RCM2000
• Processor Series: RCM2000
• Cpu Core: Rabbit 2000
• For Use With/related Products: RCM2000
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1083

A.2 Bus Loading
You must pay careful attention to bus loading when designing an interface to the RCM2000.
section provides bus loading for external devices.
Table A-2 lists the capacitance for the various RCM2000 I/O ports.
Table A-3 lists the external capacitive bus loading for the various Rabbit 2000 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.
46
Parallel Ports A to E
Data Lines D0–D7
Address Lines A0–A12
Table A-3. External Capacitive Bus Loading -40°C to +85°C
A[12:1]
D[7:1]
A[12:1]
D[7:1]
A0
D0
PD[3:0]
PA[7:0]
PB[7,6]
PC[6,4,2,0]
PD[7:4]
PE[7:0]
All data, address, and I/O
lines with clock doubler
disabled
I/O Ports
* The RCM2020 operating at 18.4 MHz will typically come with a
Output Port
flash EPROM whose access time is 55 ns. Because of the volatil-
ity of the memory market, a 90 ns flash EPROM could be used on
the RCM2020.
Table A-2. Capacitance of RCM2000 I/O Ports
16 pF
Input Capacitance
Typ.
6 pF
—
Clock Speed
25.8, 18.4,
25.8, 18.4
25.8, 18.4
12.9, 9.2
(MHz)
25.8
18.4
(pF)
12 pF
30 pF
Max.
—
Capacitive Loading (pF)
Maximum External
100 for 55 ns flash
55 for 90 ns flash
Output Capacitance
10 pF
24 pF
24 pF
Typ.
100
100
100
50
90
(pF)
RabbitCore RCM2000
*
14 pF
32 pF
32 pF
Max.
This