MC68LC302 Datasheet, PDF (142/169 Pages) Motorola, Inc – Low Power Integrated Multiprotocol Processor Reference Manual

Electrical Characteristics
6.14 AC ELECTRICAL SPECIFICATIONS—CHIP-SELECT TIMING
EXTERNAL MASTER
(see Figure 6-14)
Num.
154
160
161
162
164
165
167
Characteristic
16.67 MHz
Symbol _{Min Max}
Clock Low to DTACK Low (1-6 Wait States) t_CLDTKL — 30
AS Low to CS Low
t_ASLCSL —
30
AS High to CS High
t_ASHCSH —
30
Address Valid to AS Low
t_AVASL
15
—
AS Negated to Address Hold Time
t_ASHAI
0—
AS Low to DTACK Low (0 Wait State)
t_ASLDTKL —
45
AS High to DTACK High
t_ASHDTKH —
30
20 MHz
Min Max
— 25
— 25
— 25
12 —
0—
— 40
— 25
25 MHz
Min Max ^Unit
— 20 ns
— 20 ns
— 20 ns
10 — ns
0 — ns
— 30 ns
— 20 ns
CLKO
A23-A1
(INPUT)
AS
(INPUT)
CS3-CS0,
OE
WEH, WEL,
(OUTPUT)
R/W
(INPUT)
DTACK
(OUTPUT)
BERR
(OUTPUT)
S0
S1
S2
S3
S4
S5
S6
S7
S0
164
162
160
163
165
168
161
150
167
158
169
Figure 6-14. External Master Chip-Select Timing Diagram
MOTOROLA
MC68LC302 REFERENCE MANUAL
6-25