MT8985
AC Electrical Characteristics†- Microprocessor Bus
Voltages are with respect to ground (VSS) unless otherwise stated .
‡
Characteristics
Sym
Min
Typ
Max
Units
Test Conditions
1
2
3
4
5
6
7
8
CS Setup from DS rising
R/W Setup from DS rising
Add setup from DS rising
CS hold after DS falling
R/W hold after DS falling
Add hold after DS falling
Data setup from DTA Low on Read
Data hold on read
tCSS
tRWS
tADS
tCSH
tRWH
tADH
tDDR
tDHR
0
30
5
ns
ns
ns
ns
ns
ns
ns
ns
0
5
5
10
10
C =150 pF
L
50
90
R =1 KΩ*,
L
C =150 pF
L
9
Data setup on write (fast write)
tDSW
tSWD
20
8
ns
ns
10 Valid Data Delay on write
(slow write)
122
11 Data hold on write
tDHW
tAKD
ns
12 Acknowledgement Delay:
C =150 pF
L
Reading Data Memory
560
1220
ns
ns
ns
ns
Reading/Writing Conn. Memory
Writing to Control Register
Reading Control Register
300/370 730/800
47
70
95
155
13 Acknowledgement Hold Time
tAKH
10
60
110
ns
R =1 KΩ*,
L
C =150 pF
L
† Timing is over recommended temperature & power supply voltages .
‡ Typical figures are at 25°C and are for design aid only: not guaranteed and not subject to production testing.
* High Impedance is measured by pulling to the appropriate rail with R , with timing corrected to cancel time taken to discharge C .
L
L
2.0V
0.8V
DS
CS
2.0V
0.8V
t
t
CSS
CSH
t
t
RWH
RWS
2.0V
0.8V
R/W
t
t
ADH
ADS
2.0V
0.8V
A0-A6
2.0V
0.8V
D0-D7
READ
VALID DATA
t
t
t
DSW
DHR
SWD
2.0V
0.8V
D0-D7
WRITE
VALID DATA
t
DHW
t
DDR
t
t
AKH
AKD
2.0V
0.8V
DTA
Figure 17 - Motorola Non-Multiplexed Bus Timing
2-61
MITEL [ MITEL NETWORKS CORPORATION ]
