MC68LC040RC25A Datasheet, PDF (389/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

Freescale Semiconductor, Inc.
MC68EC040 REV2.3 (01/31/2000)
B.7.5 Clock AC Timing Specifications (see Figure B-7)
Num
Characteristic
Frequency of Operation
20 MHz
Min Max
16.67 20
25 MHz
Min Max
16.67 25
33 MHz
Min Max
16.67 33.3
40 MHz
Min Max
20
40
Unit
MHz
1 PCLK Cycle Time
25
30
20
30
15
30 12.5 25 nS
2 PCLK Rise Time
—
1.7
—
1.7
—
1.7
—
1.5 nS
3 PCLK Fall Time
—
1.6
—
1.6
—
1.6
—
1.5 nS
4
PCLK Duty Cycle Measured at
1.5 V
48
52 47.5 52.5 46.67 53.33 46.00 54.00 %
4a*
PCLK Pulse Width High
Measured at 1.5 V
12
13
9.5 10.5
7
8
5.75 6.75 _nS
4b*
PCLK Pulse Width Low
Measured at 1.5 V
12
13
9.5 10.5
7
8
5.75 6.75 nS
5 BCLK Cycle Time
50
60
40
60
30
60
25
50 nS
6,7 BCLK Rise and Fall Time
—
4
—
4
—
3
—
3
nS
8
BCLK Duty Cycle Measured at
1.5 V
40
60
40
60
40
60
40
60
%
8a*
BCLK Pulse Width High
Measured at 1.5 V
20
30
16
24
12
18
10
15 nS
8b*
BCLK Pulse Width Low
Measured at 1.5 V
20
30
16
24
12
18
10
15 nS
9 PCLK, BCLK Frequency Stability — 1000 — 1000 — 1000 — 1000 ppm
10 PCLK to BCLK Skew
—
9
—
9
— N/A — N/A nS
*Specification value at maximum frequency of operation.
PCLK
10
BCLK
MOTOROLA
1
4A
4B
V_M
2
3
V_IH
V_IL
10
6
7
V_M
V_IH
V_IL
8A
8B
5
Figure B-7. Clock Input Timing Diagram
M68040 USER’S MANUAL
B-13
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