668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 81

• Manufacturer Part Number: 668-0003-C
• Description: IC CPU RABBIT2000 30MHZ 100PQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 668-0003-C

• Rohs Status: RoHS non-compliant
• Processor Type: Rabbit 2000 8-Bit
• Speed: 30MHz
• Voltage: 2.7V, 3V, 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 100-MQFP, 100-PQFP
• Features: -
• Other names: 316-1004; 668-0003

When the clock doubler is used and there is no subsequent division of the clock, the output
clock will be asymmetric, as shown in Figure 7-2.
The doubled clock-low time is subject to wide (50%) variation since it depends on process
parameters, temperature, and voltage. The times given above are for a supply voltage of 5 V
and a temperature of 25°C. The doubled clock-low time increases by 20% when the voltage
is reduced to 4 V, and increases by about 40% when the voltage is reduced further to 3.3 V.
The values increase or decrease by 1% for each 5°C increase or decrease in temperature.
Chapter 7 Miscellaneous I/O Functions
Oscillator delayed
and inverted
Doubled clock
Example
Read
Cycle
Example
Write
Cycle
Oscillator
Delay
Time
Address, /CS
Early write pulse
option
Address, /CS
Early output enb
option
Write pulse
Output enb
Data out
Figure 7-2. Effect of Clock Doubler
0.48P
48%
P
52%
0.52P
0.48P
0.52P
Valid data out from mem
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