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MOTOROLA M68040 USER’S MANUAL 11-3
11.5 CLOCK AC TIMING SPECIFICATIONS (see Figure 11-1)
25 MHz 33 MHz 40 MHz
Num Characteristic Min Max Min Max Min Max Unit
Frequency of Operation 20 25 20 33 20 40 MHz
1 PCLK Cycle Time 20 25 15 25 12.5 25 ns
2 PCLK Rise Time 1.7 1.7 1.5 ns
3 PCLK Fall Time 1.6 1.6 1.5 ns
4 PCLK Duty Cycle Measured at 1.5 V 47.50 52.50 46.67 53.33 46.00 54.00 %
4a* PCLK Pulse Width High Measured at 1.5 V 9.50 10.50 7 8 5.75 6.75 ns
4b* PCLK Pulse Width Low Measured at 1.5 V 9.50 10.50 7 8 5.75 6.75 ns
5 BCLK Cycle Time 40 60 30 60 25 50 ns
6,7 BCLK Rise and Fall Time —4—3—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 16 24 12 18 10 15 ns
8b* BCLK Pulse Width Low Measured at 1.5 V 16 24 12 18 10 15 ns
9 PCLK, BCLK Frequency Stability 1000 1000 1000 ppm
10 PCLK to BCLK Skew 9 n/a n/a ns
*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 11-1. Clock Input Timing Diagram
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