Motorola MC68020 User Manual page 283

AC ELECTRICAL CHARACTERISTICS—READ AND WRITE CYCLES
± 5%; GND = 0 V
(V = 5.0 V
CC dc
Num. Characteristics
6 Clock High to FC, Size, RMC, Address Valid
*
6A Clock High to ECS, OCS Asserted
7 Clock High to Address, Data, FC, Size, RMC
High Impedance
8 Clock High to Address, FC, Size,
RMC Invalid
9 Clock Low to AS, DS Asserted
1
9A AS to DS Assertion Skew (Read)
11
9B AS Asserted to DS Asserted (Write)
*
10 ECS Width Asserted
*
10A OCS Width Asserted
7
*
10B ECS, OCS Width Negated
11 Address, FC, Size, RMC Valid to AS
(and DS Asserted, Read)
12 Clock Low to AS, DS Negated
*
12A Clock Low to ECS, OCS Negated
13 AS, DS Negated to Address, FC, Size,
RMC Invalid
14 AS (and DS Read) Width Asserted
14A DS Width Asserted (Write)
15 AS, DS Width Negated
8
15A DS Negated to AS Asserted
16 Clock High to AS, DS , R/ W, DBEN
High Impedance
17 AS, DS Negated to R/W Invalid
18 Clock High to R/W High
20 Clock High to R/W Low
21 R/ W High to AS Asserted (Read)
22 R/ W Low to DS Asserted (Write)
23 Clock High to Data-Out Valid
25 AS , DS Negated to Data-Out Invalid
9
*
25A DS Negated to DBEN Negated (Write)
26 Data-Out Valid to DS Asserted (Write)
27 Data-In Valid to Clock Low (Setup) (Read)
27A Late BERR/HALT Asserted to Clock Low
(Setup)
28 AS, DS Negated to DSACK≈, BERR, HALT ,
AVEC Negated
10-8
; Temperature within defined ranges; see Figures 10-3–10-5)
dc
16.67 MHz
Min
0
0
0
0
3
–15
37
20
20
15
15
0
0
15
100
40
40
35
—
15
0
0
15
75
—
15
15
15
5
20
0
M68020 USER'S MANUAL
20 MHz 25 MHz
Max Min Max Min
30 0 25 0
20 0 15 0
60 0 50 0
— 0 — 0
30 3 25 3
15 –10 10 –10
— 32 — 27
— 15 — 15
— 15 — 15
— 10 — 5
— 10 — 6
30 0 25 0
30 0 25 0
— 10 — 10
— 85 — 70
— 38 — 30
— 38 — 30
— 30 — 25
60 — 50 —
— 10 — 10
30 0 25 0
30 0 25 0
— 10 — 5
— 60 — 50
30 — 25 —
— 10 — 5
— 10 — 5
— 10 — 5
— 5 — 5
— 15 — 10
80 0 65 0
**
33.33 MHz
Max Min Max Unit
25 0 21 ns
12 0 10 ns
40 0 30 ns
— 0 — ns
18 3 15 ns
10 –10 10 ns
— 22 — ns
— 10 — ns
— 10 — ns
— 5 — ns
— 5 — ns
15 0 15 ns
15 0 15 ns
— 5 — ns
— 50 — ns
— 25 — ns
— 23 — ns
— 18 — ns
40 — 30 ns
— 5 — ns
20 0 15 ns
20 0 15 ns
— 5 — ns
— 35 — ns
25 — 18 ns
— 5 — ns
— 5 — ns
— 5 — ns
— 5 — ns
— 5 — ns
50 0 40 ns
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