MT90826 CMOS
Advanced Information
AC Electrical Characteristics - Motorola Non-Multiplexed Bus Mode
Characteristics
CS setup from DS falling
Sym
Min
Typ
Max Units Test Conditions
1
2
3
4
5
6
7
8
t
0
10
2
ns
ns
ns
ns
ns
ns
CSS
R/W setup from DS falling
Address setup from DS falling
CS hold after DS rising
t
RWS
t
ADS
CSH
RWH
t
0
R/W hold after DS rising
Address hold after DS rising
Data setup from DTA Low on Read
Data hold on read
t
2
t
10
27
12
ADH
DDR
DHR
t
ns
ns
C =150pF
L
t
20
55
C =150pF, R =1K
L
L
Note 1
9
Data setup on write (fast write)
t
t
0
ns
ns
DSW
SWD
10 Valid Data Delay on write (slow write)
50
85
185
11 Data hold on write
t
13
ns
ns
DHW
12a Acknowledgment Delay: Register RD or WR
t
C =150pF
L
AKD
12b Acknowledgment Delay: Memory RD or WR
16Mb/s, 16&8Mb/s, 8Mb/s, 4&8Mb/s
4Mb/s, 4&2Mb/s
t
AKD
100
140
240
ns
ns
ns
C =150pF
L
2Mb/s
13 Acknowledgment Hold Time
t
24
ns
C =150pF, RL=1K,
AKH
L
Note 1
Note:
1. High Impedance is measured by pulling to the appropriate rail with R , with timing corrected to cancel time taken to discharge C .
L
L
V
DS
CS
TT
t
t
CSH
CSS
V
TT
t
t
RWH
RWS
V
R/W
TT
t
t
ADS
ADH
V
Valid Address
TT
A0-A7
t
DHR
V
Valid Read Data
D0-D15
READ
TT
TT
t
t
DHW
DSW
t
SWD
V
Valid Write Data
D0-D15
WRITE
t
DDR
V
TT
DTA
t
AKD
t
AKH
Figure 14 - Motorola Non-Multiplexed Bus Timing
26
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