MC68LC302 Datasheet, PDF (133/169 Pages) Motorola, Inc – Low Power Integrated Multiprotocol Processor Reference Manual

Electrical Characteristics
6.10 AC ELECTRICAL SPECIFICATIONS—EXTERNAL MASTER
INTERNAL ASYNCHRONOUS READ/WRITE CYCLES
(see Figure 6-7 and Figure 6-8)
Num.
Characteristic
16.67 MHz 20 MHz
25 MHz
Symbol _{Min Max Min Max Min Max} Unit
100 R/W Valid to DS Low
t_RWVDSL 0
—
0
—
0
— ns
101 DS Low to Data-In Valid
t_DSLDIV — 30 — 25 — 20 ns
102 DTACK Low to Data-In Hold Time
t_DKLDH
0
—
0
—
0
— ns
103 AS Valid to DS Low
t_ASVDSL 0
—
0
—
0
— ns
104 DTACK Low to AS, DS High
t_DKLDSH 0
—
0
—
0
— ns
105 DS High to DTACK High
t_DSHDKH — 45 — 40 — 30 ns
106 DS Inactive to AS Inactive
t_DSIASI
0
—
0
—
0
— ns
107 DS High to R/W High
t_DSHRWH 0
—
0
—
0
— ns
108 DS High to Data High Impedance
t_DSHDZ — 45 — 40 — 30 ns
108A DS High to Data-Out Hold Time (see Note) t_DSHDH 0 — 0 — 0 — ns
109A Data Out Valid to DTACK Low
t_DOVDKL 15 — 15 — 10 — ns
NOTE: If AS is negated before DS, the data bus could be three-stated (spec 126) before DS is negated.
6-16
MC68LC302 REFERENCE MANUAL
MOTOROLA