MOTOROLA
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
10-11
Num
Characteristic
8 MHz*
10 MHz*
12.5 MHz*
16.67 MHz
12F
16 MHz
20 MHz
Unit
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
262
Data-Out Valid to DS Asserted
(Write)
40
—
30
—
20
—
15
—
15
—
10
—
ns
275
Data-In Valid to Clock Low
(Setup Time on Read)
10
—
10
—
10
—7
—5
—
ns
27A5
Late BERR Asserted to Clock
Low (setup Time)
45
—
45
—
45
——
—
ns
282
AS, DS Negated to DTACK
Negated (Asynchronous Hold)
0
2401
1
0
190
0
150
0
110
0
110
0
95
ns
28A
AS, DS Negated to Data-In
High Impedance
—
187
—
150
—
120
—
110
—
110
—
95
ns
29
AS, DS Negated to Data-In
Invalid (Hold Time on Read)
0—
0—ns
29A
AS, DS Negated to Data-In
High Impedance
—
187
—
150
—
120
—
90
—
90
—
75
ns
30
AS, DS) Negated to BERR
Negated
0—
0—ns
312,5
DTACK Asserted to Data-In
Valid (Setup Time)
—90—65
—50—40
—50—42
ns
32
HALT) and RESET Input
Transition Time
0
200
0
200
0
200
0
150
—
150
0
150
ns
33
Clock High to BG Asserted
—
62
—
50
—
40
—
40
0
30
0
25
ns
34
Clock High to BG Negated
—
62
—
50
—
40
—
40
0
30
0
25
ns
35
BR Asserted to BG Asserted
1.5
3.5
1.5
3.5
1.5
3.5
1.5
3.5
1.5
3.5
1.5
3.5
Clks
367
BR Negated toBG Negated
1.5
3.5
1.5
3.5
1.5
3.5
1.5
3.5
1.5
3.5
1.5
3.5
Clks
37
BGACK Asserted to BG
Negated
1.5
3.5
1.5
3.5
1.5
3.5
1.5
3.5
1.5
3.5
1.5
3.5
Clks
37A8
BGACK Asserted to BR
Negated
20
1.5
Clks
20
1.5
Clks
20
1.5
Clks
10
1.5
Clks
10
1.5
Clks
10
1.5
Clks
ns
38
BG Asserted to Control,
Address, Data Bus High
Impedance (AS Negated)
—80—70
—60—50
—50—42
ns
39
BG Width Negated
1.5
—
1.5
—
1.5
—
1.5
—
1.5
—
1.5
—
clks
40
Clock Low to VMA Asserted
—
70
—
70
—
70
—
50
—
50
—
40
ns
41
Clock Low to E Transition
—
5512
—45—35
—35—35
—30
ns
42
E Output Rise and Fall Time
—
15
—
15
—
15
—
15
—
15
—
12
ns
43
VMA Asserted to E High
200
—
150
—
90
—
80
—
80
—
60
—
ns
44
AS, DS Negated to VPA
Negated
0
120
0
90
0
70
0
50
0
50
0
42
ns
45
E Low to Control, Address
Bus Invalid (Address Hold
Time)
30
—
10
—
10
—
10
—
10
—
10
—
ns
46
BGACK Width Low
1.5
—
1.5
—
1.5
—
1.5
—
1.5
—
1.5
—
ns
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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