Motorola MC68020 User Manual

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

Motorola MC68020 Specifications

General

Brand	Motorola
Model	MC68020
Category	Computer Hardware
Language	English