
10-10
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
MOTOROLA
10.10 AC ELECTRICAL SPECIFICATIONS — READ AND WRITE CYCLES
(V CC=5.0 VDC±5+; GND=0 V; TA=TL to TH; (see Figures 10-4 and 10-5) (Applies To All
Processors Except The MC68EC000)
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
6
Clock Low to Address Valid
—
62
—
50
—
50
—
50
30
—
25
ns
6A
Clock High to FC Valid
—
62
—
50
—
45
—
45
0
30
0
25
ns
7
Clock High to Address, Data
Bus High Impedance
(Maximum)
—
80
—
70
—
60
—
50
—
42
ns
8
Clock High to Address, FC
Invalid (Minimum)
0—
0—ns
91
Clock High to AS, DS
Asserted
360350
340340
330325
ns
112
Address Valid to AS, DS
Asserted (Read)/
AS Asserted
(Write)
30
—
20
—
15
—
15
—
15
—
10
—
ns
11A2
FC Valid to AS ), DS Asserted
(Read)/ AS ) Asserted (Write)
90
—
70
—
60
—
30
—
45
—
40
—
ns
121
Clock Low to AS, DS Negated
—
62
—
50
—
40
—
40
3
30
3
25
ns
132
AS, DS Negated to Address,
FC Invalid
40
—
30
—
20
—
10
—
15
—
10
—
ns
142
ASand DS Read) Width
Asserted
270
—
195
—
160
—
120
—
120
—
100
—
ns
14A
DS Width Asserted (Write)
140
95
80
60
—
50
—
ns
152
AS, DS Width Negated
150
—
105
—
65
—
60
—
60
—
50
—
ns
16
Clock High to Control Bus
High Impedance
—80—70
—60—50
—50—42
ns
172
AS, DS Negated to R/W
Invalid
40
—
30
—
20
—
10
—
15
—
10
—
ns
181
Clock High to R/W High
(Read)
055045
040040
030025
ns
201
Clock High to R/W Low
(Write)
055045
040040
030025
ns
20A2,6 AS Asserted to R/W Valid
(Write)
—10—10
ns
212
Address Valid to R/W Low
(Write)
20
—0
—
ns
21A2
FC Valid to R/W Low (Write)
60
—
50
—
30
—
20
—
30
—
25
—
ns
222
R/ W Low to DS Asserted
(Write)
80
—
50
—
30
—
20
—
30
—
25
—
ns
23
Clock Low to Data-Out Valid
(Write)
—
62
—
50
—
50
—
550
—
30
—
25
ns
252
AS, DS) Negated to Data-Out
Invalid (Write)
401
0
—30—20
—15—15
—10—
ns
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Freescale Semiconductor, Inc.
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