
10-24
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
MOTOROLA
10.14 MC68EC000 AC ELECTRICAL SPECIFICATIONS — READ AND
WRITE CYCLES
(VCC=5.0 VDC
±
5;PC; GND = 0 VDC; TA = TL TO TH; (See Figures
10-12 and 10-13)
Num
Characteristic
8 MHz
10 MHz
12.5 MHz
16.67 MHz
20 MHz
Unit
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
6
Clock Low to Address Valid
—
35
—
35
—
35
—
30
—
25
ns
6A
Clock High to FC Valid
—
35
—
35
—
35
—
30
0
25
ns
7
Clock High to Address, Data Bus
High Impedance (Maximum)
—
55
—
55
—
55
—
50
—
42
ns
8
Clock High to Address, FC Invalid
(Minimum)
0
—
0
—
0
—
0
—
0
—
ns
91
112
Clock High to
AS
,
DS
Asserted
3
35
3
35
3
35
3
30
3
25
ns
Address Valid to
AS, DS
Asserted
(Read)/
AS
Asserted (Write)
30
—
20
—
15
—
15
—
10
—
ns
11A2
FC Valid to
AS, DS
Asserted
(Read)/
AS
Asserted (Write)
45
—
45
—
45
—
45
—
40
—
ns
121
132
Clock Low to
AS
,
DS
Negated
3
35
3
35
3
35
3
30
3
25
ns
AS, DS
Negated to Address, FC
Invalid
15
—
15
—
15
—
15
—
10
—
ns
142
AS
(and
DS
Read) Width
Asserted
270
—
195
—
160
—
120
—
100
—
ns
14A2
152
DS
Width Asserted (Write)
140
—
95
—
80
—
60
—
50
—
ns
AS, DS
Width Negated
150
—
105
—
65
—
60
—
50
—
ns
16
Clock High to Control Bus High
Impedance
—
55
—
55
—
55
—
50
—
42
ns
172
181
201
AS, DS
Negated to R/
W
Invalid
15
—
15
—
15
—
15
—
10
—
ns
Clock High to R/
W
High (Read)
0
35
0
35
0
35
0
30
0
25
ns
Clock High to R/
W
Low (Write)
0
35
0
35
0
35
0
30
0
25
ns
20A
2,6
212
21A2
222
AS
Asserted to R/
W
Low (Write)
—
10
—
10
—
10
—
10
—
10
ns
Address Valid to R/
W
Low (Write)
0
—
0
—
0
—
0
—
0
—
ns
FC Valid to R/
W
Low (Write)
60
—
50
—
30
—
30
—
25
—
ns
R/
W
Low to
DS
Asserted (Write)
80
—
50
—
30
—
30
—
25
—
ns
23
Clock Low to Data-Out Valid
(Write)
—
35
—
35
—
35
—
30
—
25
ns
252
AS, DS
Negated to Data-Out
Invalid (Write)
40
—
30
—
20
—
15
—
10
—
ns
262
Data-Out Valid to
DS
Asserted
(Write)
40
—
30
—
20
—
15
—
10
—
ns
275
Data-In Valid to Clock Low (Setup
Time on Read)
5
—
5
—
5
—
5
—
5
—
ns
282
AS
,
DS
Negated to
DTACK
Negated (Asynchronous Hold)
0
110
0
110
0
110
0
110
0
95
ns
28A
Clock High to
DTACK
Negated
0
110
0
110
0
110
0
110
0
95
ns