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B- 14 M68040 USER’S MANUAL MOTOROLA
B.7.5 Clock AC Timing Specifications (see Figure B-7)
20 MHz 25 MHz 33 MHz
Num Characteristic Min Max Min Max Min Max Unit
Frequency of Operation 16.67 20 16.67 25 16.67 33.3 MHz
1 PCLK Cycle Time 25 30 20 30 15 30 ns
2 PCLK Rise Time 1.7 1.7 1.7 ns
3 PCLK Fall Time 1.6 1.6 1.6 ns
4 PCLK Duty Cycle Measured at 1.5 V 48 52 47.5 52.5 46.67 53.33 %
4a* PCLK Pulse Width High Measured at 1.5 V 12 13 9.5 10.5 7 8 ns
4b* PCLK Pulse Width Low Measured at 1.5 V 12 13 9.5 10.5 7 8 ns
5 BCLK Cycle Time 50 60 40 60 30 60 ns
6,7 BCLK Rise and Fall Time —4—4—3ns
8 BCLK Duty Cycle Measured at 1.5 V 40 60 40 60 40 60 %
8a* BCLK Pulse Width High Measured at 1.5 V 20 30 16 24 12 18 ns
8b* BCLK Pulse Width Low Measured at 1.5 V 20 30 16 24 12 18 ns
9 PCLK, BCLK Frequency Stability 1000 1000 1000 ppm
10 PCLK to BCLK Skew —9—9—n/ans
*Specification value at maximum frequency of operation.
23
1
5
6 71010
PCLK
BCLK
8B8A
4A 4B
VM
V
V
IH
IL
VIH
VIL
VM
Figure B-7. Clock Input Timing Diagram
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