Motorola M68000 - MC68 EC000 AC Electrical Specifications-Read and Write

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; T
A
= T
L
TO T
H
; (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
9
1
Clock High to AS, DS Asserted 3 35 3 35 3 35 3 30 3 25 ns
11
2
Address Valid to AS, DS Asserted
(Read)/AS Asserted (Write)
30 — 20 — 15 — 15 — 10 — ns
11A
2
FC Valid to AS, DS Asserted
(Read)/ AS Asserted (Write)
45 — 45 — 45 — 45 — 40 — ns
12
1
Clock Low to AS, DS Negated 3 35 3 35 3 35 3 30 3 25 ns
13
2
AS, DS Negated to Address, FC
Invalid
15 — 15 — 15 — 15 — 10 — ns
14
2
AS (and DS Read) Width
Asserted
270 — 195 — 160 — 120 — 100 — ns
14A
2
DS Width Asserted (Write) 140 — 95 — 80 — 60 — 50 — ns
15
2
AS, DS Width Negated 150 — 105 — 65 — 60 — 50 — ns
16 Clock High to Control Bus High
Impedance
— 55 — 55 — 55 — 50 — 42 ns
17
2
AS, DS Negated to R/W Invalid 15 — 15 — 15 — 15 — 10 — ns
18
1
Clock High to R/W High (Read) 0 35 0 35 0 35 0 30 0 25 ns
20
1
Clock High to R/W Low (Write) 0 35 0 35 0 35 0 30 0 25 ns
20A
2,6
AS Asserted to R/W Low (Write) — 10 — 10 — 10 — 10 — 10 ns
21
2
Address Valid to R/W Low (Write) 0 — 0 — 0 — 0 —0—ns
21A
2
FC Valid to R/W Low (Write) 60 — 50 — 30 — 30 — 25 — ns
22
2
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
25
2
AS, DS Negated to Data-Out
Invalid (Write)
40 — 30 — 20 — 15 — 10 — ns
26
2
Data-Out Valid to DS Asserted
(Write)
40 — 30 — 20 — 15 — 10 — ns
27
5
Data-In Valid to Clock Low (Setup
Time on Read)
5— 5 — 5 —5 —5—ns
28
2
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
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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