User’s Manual
155
Table 15-2. Memory Access Time Requirements (V±5%, T -40°C to +70°C)
Clock
Speed
(MHz)
Period
(ns)
Wait
States
Memory
Access Time
@5 V 20 pF
Load
(ns)
Memory
Access Time
@5 V 70 pF Load
(ns)
Maximum PC-
Compatible
Baud Rate
(bps)
29.4912
34
0
59
52
921,600
27.6480 36.2
0
64
57
57,600
25.8048
38.7
0
69
62
115,200
25.8048
38.7
1
108
101
115,200
25.8048
38.7
2
147
140
115,200
24.576
40.7
0
73
66
38,400
23.9616
41.7
0
75
68
57,600
22.1184
45.2
0
82
75
230,400
22.1184
45.2
1
127
120
230,400
22.1184
45.2
2
173
165
230,400
20.2752
49.3
0
90
83
57,600
18.432
54.2
0
100 @ 5 V
96 @ 3.3 V
93 @ 5 V
87 @ 3.3 V
115,200
14.7456
67.8
0
127 @ 5 V/
123 @ 3.3 V
120 @ 5 V/
114 @ 3.3 V
460,800
14.7456
67.8
1
197 @ 5 V/
193 @ 3.3 V
190 @ 5 V/
184 @ 3.3 V
460,800
11.0592
90.5
0
172 @ 5 V
168 @ 3.3 V
162 @ 2.5 V(min)
165 @ 5 V/
159 @ 3.3 V
150 @ 2.5 V(min)
115,200
7.3728
135.6
0
263 @ 5 V/
259 @ 3.3 V
253 @ 2.5V(min)
256 @ 5 V/
250 @ 3.3 V/
241 @ 2.5 V(min)
230,400
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