Motorola M68000 - AC Electrical Specifications-MC68000 to M6800 Peripheral

MOTOROLA M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL 10-15
10.11 AC ELECTRICAL SPECIFICATIONS—MC68000 TO M6800
PERIPHERAL (V
CC
= 5.0 Vdc ±5%; GND=0 Vdc; T
A
= T
L
TO T
H
; refer to figures 10-6)
(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
12
1
Clock Low to AS, DS Negated — 62 — 50 — 40 — 40 3 30 3 25 ns
18
1
Clock High to R/W High
(Read)
055045040040030025ns
20
1
Clock High to R/W Low
(Write)
055045040040030025ns
23 Clock Low to Data-Out Valid
(Write)
—62—50—50—50—30—25ns
27 Data-In Valid to Clock Low
(Setup Time on Read)
10—10—10—7—5—5—ns
29 AS, DS Negated to Data-In
Invalid (Hold Time on Read)
0—0—0—0—0—0—ns
40 Clock Low to VMA Asserted — 70 — 70 — 70 — 50 — 50 — 40 ns
41 Clock Low to E Transition — 55 — 45 — 35 — 35 — 35 — 30 ns
42 E Output Rise and Fall Time — 15 — 15 — 15 — 15 — 15 — 12 ns
43 VMA Asserted to E High 200 — 150 — 90 — 80 — 80 — 60 — ns
44 AS, DS Negated to VPA
Negated
0 120 0 90 0 70 0 50 0 50 0 42 ns
45 E Low to Control, Address
Bus Invalid (Address Hold
Time)
30 — 10 — 10 — 10 — 10 — 10 — ns
47 Asynchronous Input Setup
Time
10 — 10 — 10 — 10 — 10 — 5 — ns
49
2
AS, DS, Negated to E Low -70 70 -55 55 -45 45 -35 35 -35 35 –30 30 ns
50 E Width High 450 — 350 — 280 — 220 — 220 — 190 — ns
51 E Width Low 700 — 550 — 440 — 340 — 340 — 290 — ns
54 E Low to Data-Out Invalid 30 — 20 — 15 — 10 — 10 — 5 — ns
*These specifications represent improvement over previously published specifications for the 8-, 10-, and 12.5-MHz
MC68000 and are valid only for product bearing date codes of 8827 and later.
** This frequency applies only to MC68HC000 and MC68HC001.
NOTES: 1. For a loading capacitance of less than or equal to 50 pF, subtract 5 ns from the value given in the
maximum columns.
2. The falling edge of S6 triggers both the negation of the strobes (AS and DS ) and the falling edge of E.
Either of these events can occur first, depending upon the loading on each signal. Specificaton
#49 indicates the absolute maximum skew that will occur between the rising edge of the strobes and the
falling edge of the E clock.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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