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MOTOROLA M68040 USER’S MANUAL C- 21
C.7.5 Clock AC Timing Specifications (See Figure C-12)
PRELIMINARY
0 - 16.67 MHz 25 MHz 33 MHz
Num Characteristic Min Max Min Max Min Max Unit
Frequency of Operation 0 16.67 16.67 25 16.67 33 MHz
5 BCLK Cycle Time 60 40 60 30 60 ns
6,7 1BCLK Rise and Fall Time —2—2—2ns
8 BCLK Duty Cycle Measured at 1.5 V 45 55 45 55 45 55 %
8a2BCLK Pulse Width High Measured at 1.5 V 28.5 18 22 13.63 16.66 ns
8b2BCLK Pulse Width Low Measured at 1.5 V 28.5 18 22 13.63 16.66 ns
9 BCLK edge to edge jitter 20 20 ps
NOTES:
1. Rising and falling edges of BCLK must be monotonic.
2. Specification value at maximum frequency of operation. BCLK must not exceed 16.67 MHz for low
frequency operation
VM
5
67
VIH
VIL
BCLK
8B8A
Figure C-12. Clock Input Timing Diagram
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