mt8981dl Mitel, mt8981dl Datasheet - Page 3

• Manufacturer Part Number: mt8981dl
• Description: Iso-cmos St-bus ?amily Digital Switch
• Manufacturer: Mitel

Pin Description (continued)
DIP
13-
16-
22-
25-
31-
36-
12
15
18
19
20
21
24
29
30
34
35
38
39
40
40
Pin #
PLCC
15-
19-
25-
29-
35-
41-
14
17
21
22
23
24
27
33
34
38
39
43
44
44
1
QFP
9-11 A0-A2 Address 0 to 2 (Inputs). These are the inputs for the address lines on the
13-
19-
23-
29-
35-
15
16
17
18
21
27
28
32
33
37
38
39
44
8
D7-D5 Data 7 to 5 (Three-state I/O Pins). These are the bidirectional data pins on the
D4-D0 Data 4 to 0 (Three-state I/O Pins). These are the bidirectional data pins on the
A3-A5 Address 3 to 5 (Inputs). These are the inputs for the address lines on the
Name
STo2-
STo3 ST-BUS Output 3 (Three-state Outputs). These are the pins for the four 2048 kbit/s
STo0
ODE Output Drive Enable (Input). If this input is held high, the STo0-STo3 output drivers
R/W
C4i
V
DS
CS
IC
IC
SS
4.096 MHz Clock (Input). ST-BUS bit cell boundaries lie on the alternate falling
edges of this clock.
microprocessor interface.
microprocessor interface
Data Strobe (Input). This is the input for the active high data strobe on the
microprocessor interface.
Read or Write (Input). This is the input for the read/write signal on the
microprocessor interface - high for read, low for write.
Chip Select (Input). This is the input for the active low chip select on the
microprocessor interface.
microprocessor interface.
microprocessor interface.
Power Input. Negative Supply (Ground).
Internal Connections. Leave pins disconnected.
ST-BUS output streams.
ST-BUS Output 2 to 0 (Three-state Outputs). These are the pins for the four 2048
kbit/s ST-BUS output streams.
function normally. If this input is low, the STo0-STo3 output drivers go into their high
impedance state. NB: Even when ODE is high, channels on the STo0-STo3 outputs
can go high impedance under software control.
Internal Connection. Leave pin disconnected.
Description
ISO-CMOS
MT8981D
2-19