Motorola MC68EC000, User Manual

Page: 11 / 26

11 M68000 USER’S MANUAL ADDENDUM MOTOROLA
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.
Applies to 3.3V and 5V.
Figure 8. MC68SEC000 Clock Input Timing Diagram
10MHz 16MHz 20MHz
NUM. CHARACTERISTIC SYMBOL MIN MAX min max min max UNIT
Frequency of Operation f 0 10.0 0 16.7 0 20.0 MHz
1 Cycle time tcyc 100 — 60 — 50 — ns
2,3 Clock Pulse Width t
CL
t
CH
45
45 —
— 27
27 —
— 21
21 —
— ns
4,5 Clock Rise and Fall Times t
Cr
t
Cf
—
— 10
10 —
— 5
5 —
— 4
4 ns
0.8 V
2.0 V
4 5
1
2
3
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.
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Freescale Semiconductor, Inc.
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