668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 24
668-0010
Manufacturer Part Number
668-0010
Description
IC MPU RABIT3000 55.5MHZ 128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0010
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Features
-
Other names
316-1016
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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 2-3.
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 core supply voltage
of 3.3 V and a temperature of 25°C. The doubled-clock low time increases by 20% when
the voltage is reduced to 2.5 V, and increases by about 40% when the voltage is reduced
further to 2.0 V. The values increase or decrease by 1% for each 5°C increase or decrease
in temperature. The doubled clock is created by xor’ing the delayed and inverted clock
with itself. If the original clock does not have a 50-50 duty cycle, then alternate clocks will
have a slightly different length. Since the duty cycle of the built-in oscillator can be as
14
Oscillator delayed
Example
Write
Cycle
Example
Read
Cycle
Doubled clock
and inverted
Delay
time
Oscillator
Address / CS
Address / CS
Early output enb
option
Early write pulse
option
Write pulse
Output enb
Figure 2-3. Effect of Clock Doubler
Data out
0.48P
48%
P
52%
0.52P
0.48P
Rabbit 3000 Microprocessor User’s Manual
0.52P
Data out from mem
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