MT8985AL Zarlink, MT8985AL Datasheet - Page 21

• Manufacturer Part Number: MT8985AL
• Description: Switch Fabric 256 x 256 16.384Mbps 5V 44-Pin MQFP Tray
• Manufacturer: Zarlink

Specifications of MT8985AL

• Package: 44MQFP
• Number Of Ports: 8
• Fabric Size: 256 x 256
• Switching Bandwidth: 16.384 Mbps
• Switch Core: Non-Blocking
• Port Speed: 2.048 Mbps
• Operating Supply Voltage: 5 V

† Timing is over recommended temperature & power supply voltages.
‡ Typical figures are at 25
* 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
12 Acknowledgement Delay:
13 Acknowledgement Hold Time
11 Data hold on write
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)
Reading/Writing Conn. Memory
Characteristics
Writing to Control Register
Reading Control Register
°
C and are for design aid only: not guaranteed and not subject to production testing.
Reading Data Memory
†
- Microprocessor Bus
Zarlink Semiconductor Inc.
Sym.
t
t
t
t
t
t
t
t
t
t
t
t
t
RWH
DHW
RWS
DDR
DHR
DSW
SWD
CSS
ADS
CSH
ADH
AKD
AKH
MT8985
21
Min.
L
30
10
10
20
10
, with timing corrected to cancel time taken to discharge C
0
5
0
5
5
8
300/370
Typ.
560
50
70
60
47
‡
730/800
Max.
1220
122
155
110
90
95
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
R
C
R
C
C
C
L
L
L
L
Test Conditions
L
L
=1 KΩ*,
=150 pF
=1 KΩ*,
=150 pF
=150 pF
=150 pF
Data Sheet
L
.