6.0 MC68SEC000 AC ELECTRICAL SPECIFICATIONS — CLOCK
TIMING (See Figure 2)
Add the following table and Figure 8 to Section 10.9 on page 10-9.
10MHz
MAX
16MHz
20MHz
NUM.
CHARACTERISTIC
Frequency of Operation
Cycle time
SYMBOL
MIN
0
min
0
max
16.7
—
min
0
max
20.0
—
UNIT
MHz
ns
f
10.0
—
1
tcyc
100
60
50
2,3
Clock Pulse Width
t
45
45
—
—
27
27
—
—
21
21
—
—
ns
CL
t
CH
4,5
Clock Rise and Fall Times
t
t
—
—
10
10
—
—
5
5
—
—
4
4
ns
Cr
Cf
Applies to 3.3V and 5V.
1
3
2
2.0 V
0.8 V
4
5
NOTE: Timing measurements are referenced to and from a low voltage of 0.8 V and a
high voltage of 2.0 V, unless otherwise noted. The voltage swing through this
range should start outside and pass through the range such that the rise or
fall will be linear between 0.8 V and 2.0 V.
Figure 8. MC68SEC000 Clock Input Timing Diagram
11
M68000 USER’S MANUAL ADDENDUM
MOTOROLA
MOTOROLA [ MOTOROLA ]
