MT8985 Mitel Networks Corporation, MT8985 Datasheet - Page 2

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

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MT8985
Pin Description
2-46
13-18 15-17
DIP
2-9
10
11
12
19
20
40
1
VDD
STi3
STi4
STi5
STi6
STi7
C4i
F0i
19-21
A0
A1
A2
Pin #
PLCC
7-11
3-5
12
13
14
22
23
44
2
1819 20 21 22
7
8
9
10
11
12
13
14
15
16
17
41-43
13-15
6 5 4 3 2
9-11
QFP
1-5
40
16
17
44
6
7
8
Name
A0-A5 Address 0 to 5 (Inputs). These lines provide the address to MT8985 internal
44 PIN PLCC
STi0-
STi7
R/W Read/Write (Input). This input controls the direction of the data bus lines (D0-D7)
DTA
V
F0i
C4i
DS
DD
23
1
24 25 26 27 28
44 43 42 41 40
Data Acknowledgement (Open Drain Output). This active low output indicates that
a data bus transfer is complete. A pull-up resistor is required at this output.
ST-BUS Input 0 to 7 (Inputs). Serial data input streams. These streams have 32
channels at data rates of 2.048 Mbit/s.
+5 Volt Power Supply rail.
Frame Pulse (Input): This input accepts and automatically identifies frame
synchronization signals formatted according to different backplane specifications
such as ST-BUS and GCI.
Clock (Input). 4.096 MHz serial clock for shifting data in and out of the data streams.
registers.
Data Strobe (Input). This is the input for the active high data strobe on the
microprocessor interface. This input operates with CS to enable the internal read and
write generation.
during a microprocessor access.
29
39
38
37
36
35
34
33
32
31
30
Figure 2 - Pin Connections
STo3
STo4
STo5
STo6
STo7
VSS
D0
D1
D2
D3
D4
VDD
DTA
STi0
STi1
STi2
STi3
STi4
STi5
STi6
STi7
R/W
C4i
F0i
DS
A0
A1
A2
A3
A4
A5
40 PIN PLASTIC DIP
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
Description
CSTo
ODE
STo0
STo1
STo2
STo3
STo4
STo5
STo6
STo7
VSS
D0
D1
D2
D3
D4
D5
D6
D7
CS
STi3
STi4
STi5
STi6
STi7
VDD
C4i
F0i
A0
A1
A2
1
2
3
4
5
6
7
8
9
10
11
44 PIN QFP
23
33
32
31
30
29
28
27
26
25
24
STo3
STo4
STo5
STo6
STo7
VSS
D0
D1
D2
D3
D4