668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 25

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

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

asymmetric as 52% / 48%, the clock generated by the clock doubler will exhibit up to a
4% variation in period on alternate clocks. Memory access time is not affected because the
memory bus cycle is 2 clocks long and includes both a long and a short clock, resulting in
no net change due to asymmetry. However, if an odd number of wait states is used, then
the memory access time will be affected slightly
The maximum allowed clock speed must be slightly reduced if the clock is supplied via
the clock doubler. The only signals clocked on the falling edge of the clock are the mem-
ory and I/O write pulses and the early option memory output enable. See Chapter 5 for
more information on the early output enable and write enable options.
The power consumption is proportional to the clock frequency, and for this reason power
can be reduced by slowing the clock when less computing activity is taking place. The
clock doubler provides a convenient method of temporarily speeding up or slowing down
the clock as part of a power management scheme.
Chapter 2 Clocks
15