MT8985 Mitel Networks Corporation, MT8985 Datasheet - Page 17

• Manufacturer Part Number: MT8985
• Description: Enhanced Digital Switch
• Manufacturer: Mitel Networks Corporation

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† 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
AC Electrical Characteristics
Voltages are with respect to ground (VSS) unless otherwise stated .
10 Valid Data Delay on write
11 Data hold on write
12 Acknowledgement Delay:
13 Acknowledgement Hold Time
DS
CS
R/W
A0-A6
D0-D7
READ
D0-D7
WRITE
DTA
1
2
3
4
5
6
7
8
9
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
Data setup on write (fast write)
(slow write)
2.0V
0.8V
2.0V
0.8V
2.0V
0.8V
2.0V
0.8V
2.0V
0.8V
2.0V
0.8V
2.0V
0.8V
Reading/Writing Conn. Memory
Characteristics
Writing to Control Register
Reading Control Register
Reading Data Memory
Figure 17 - Motorola Non-Multiplexed Bus Timing
†
- Microprocessor Bus
t
t
ADS
CSS
t
RWS
Sym
t
t
t
t
t
t
t
t
t
t
t
t
t
RWS
RWH
DSW
SWD
DHW
CSS
ADS
CSH
ADH
DDR
DHR
AKD
AKH
t
SWD
Min
30
10
10
20
10
L
0
5
0
5
5
8
, with timing corrected to cancel time taken to discharge C
t
AKD
t
DDR
300/370
Typ
560
50
70
60
47
‡
VALID DATA
VALID DATA
t
730/800
DSW
1220
Max
122
155
110
90
95
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
t
DHW
t
AKH
t
CSH
R
C
R
C
t
t
C
C
ADH
RWH
L
L
L
L
Test Conditions
L
L
t
=1 K *,
=150 pF
=1 K *,
=150 pF
DHR
=150 pF
=150 pF
MT8985
L
.
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