20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 254
20-668-0011
Manufacturer Part Number
20-668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 20-668-0011
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
Data Bus Width
8 bit
Maximum Clock Frequency
55.5 MHz
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 55 C
Number Of Programmable I/os
56
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
316-1061
Available stocks
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Part Number:
20-668-0011
Manufacturer:
Rabbit Semiconductor
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The access time is given by
Similarly, the gross output-enable access time is T + minimum clock low time (it is
assumed that the early output enable option is enabled). This is reduced by the spectrum
spreader loss, the time from clock to output for the output enable signal, the data setup
time, and a correction for the asymmetry of the original oscillator clock.
Example Output-Enable Access Time Calculation
• clock = 29.49 MHz, so T = 34 ns
• operating voltage is 3.3 V
• the clock doubler has a nominal delay of 16 ns (see Table 27-8), resulting in a minimum
• clock to output enable is 5 ns (assuming 20 pF load)
• spectrum spreader is on in normal mode, resulting in a loss of 3 ns worst-case (see
• main clock asymmetry is 52% / 48%, resulting in a loss of 4% of the clock period, or
The output enable access time is given by
244
clock low time of 80% × 16 ns = 12.8 ns
Table 27-9)
1.4 ns
NOTE: There is some process and temperature variation in the clock doubler settings. As
a rule of thumb, a 20% variation should be considered. When the doubler is enabled,
80% of the nominal value should be used for the memory access time calculation.
access time
access time
= 2T - (clock to address) - (data setup) - (spreader delay)
= 68 ns - 8 ns - 1 ns - 3 ns
= 56 ns
= T + (min. clock low) - (clock to output enable) -
= 34 ns + 12.8 ns - 5 ns - 3 ns - 1.4 ns - 1 ns
= 36 ns
(spreader delay) - (asymmetry delay) - (data setup time)
Rabbit 3000 Microprocessor User’s Manual
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