668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 261

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668-0011

Manufacturer Part Number
668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet

Specifications of 668-0011

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
316-1043

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
668-0011
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
27.6 Reduced-Power External Main Oscillator
The circuit in Figure 27-9 can be used to generate the main clock using less power than
with the built-in oscillator buffer. The power consumption is less because of the current-
limiting resistors that cannot be used with the built-in buffer. The 2.2 k series resistor
must be reduced as the clock frequency increases, as must be the current-limiting resistors.
Table 27-13 lists results for the reduced-power external oscillator with no current-limiting
resistors.
Design Recommendations
• Add current-limiting resistors to reduce current without inhibiting oscillator start-up
• Increase the 1 M resistor to improve gain
• Minimize loop area to reduce EMI
Chapter 27 Specifications
Table 27-13. Current Draw Using Reduced-Power External Oscillator
Figure 27-9. Reduced-Power External Main Oscillator
Voltage
(0  current-limiting resistors)
(V)
3.3
2.5
1.8
Current (incl built-in buffer)
(mA)
0.635
0.380
0.252
W
W
251

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