Fluke Biomedical 956A-201-M2 - Manual (Page 53)

3-27
MC6802 • MC6808 • MC6802NS
Bus Timing Characteristics
Ident.
Number
Characteristics Symbol
MC6802NS
MC6802
MC6808
MC68A02
MC68A08 MC68B02
MC68B08
Unit
Min. Max. Min. Max. Min. Max.
1 Cycle Time t cyc 1.0 10 0.667 10 0.5 10 µS
2 Pulse Width, E Low PW EL 450 5000 280 5000 210 5000 ns
3 Pulse Width, E High PW EH 450 9500 280 9700 220 9700 ns
4 Clock Rise and Fall Time t r, t f --- 25 --- 25 --- 20 ns
9 Address Hold Time t AH 20 --- 20 --- 20 --- ns
12
Non-Muxed Address Valid
Time to E (see note 5)
t AV1
t AV2
160
---
---
270
100
---
---
--- 50
---
---
--- ns
ns
17 Read Data Setup Time t DSR 100 --- 70 --- 60 --- ns
18 Read Data Hold Time t DHR 10 --- 10 --- 10 --- ns
19 Write Data Delay Time t DDW --- 225 --- 170 --- 160 ns
21 Write Data Hold Time t DHW 30 --- 20 --- 20 --- ns
29
Usable Access Time (See
Note 4)
t ACC 605 --- 310 --- 235 --- ns
Figure 3-4. Read/Write Timing Diagram
Notes:
1. Voltage levels shown are V
L
< 0.4 V, V
H
> 2.4 V, unless otherwise specified.
2. Measurement points shown are 0.8 V and 2.0 V, unless otherwise noted.
3. All electricals shown for the MC6802 apply to the MC6802NS and MC6808, unless otherwise noted.
4. Usable access time is computed by: 12 + 3 + 4 – 17.