mt8981de1 Zarlink Semiconductor, mt8981de1 Datasheet - Page 2

• Manufacturer Part Number: mt8981de1
• Description: Digital Switch
• Manufacturer: Zarlink Semiconductor

Pin Description
13-15 15-17 A0-A2 Address 0 to 2 (Inputs). These are the inputs for the address lines on the microprocessor interface.
16-18 19-21 A3-A5 Address 3 to 5 (Inputs). These are the inputs for the address lines on the microprocessor interface
DIP
2-4
6-9
10
11
12
19
20
21
40
1
5
Pin #
PLCC
8-11
STi3
VDD
3-5
44
12
13
14
22
23
24
C4i
2
7
F0i
A0
A1
A2
IC
IC
IC
IC
Name
STi0-
DTA Data Acknowledgement (Open Drain Output). This is the data acknowledgement on the
STi2
STi3 ST-BUS Input 3 (Input). These are the inputs for the 2048 kbit/s ST-BUS input streams.
R/W
V
C4i
F0i
DS
CS
IC
7
8
9
10
11
12
13
14
15
16
17
DD
microprocessor interface. This pin is pulled low to signal that the chip has processed the data. A
909 Ω, 1/4 W, resistor is recommended to be used as a pullup.
ST-BUS Input 0 to 2 (Inputs). These are the inputs for the 2048 kbit/s ST-BUS input streams.
Internal Connections. Must be connected to V
Power Input. Positive Supply.
Framing 0-Type (Input). This is the input for the frame synchronization pulse for the 2048 kbit/s
ST-BUS streams. A low on this input causes the internal counter to reset on the next negative
transition of C4i.
4.096 MHz Clock (Input). ST-BUS bit cell boundaries lie on the alternate falling edges of this clock.
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.
44 PIN PLCC
39
38
37
36
35
34
33
32
31
30
29
Figure 2 - Pin Connections
STo3
IC
IC
IC
IC
VSS
D0
D1
D2
D3
D4
Zarlink Semiconductor Inc.
MT8981D
2
Description
DD
.
VDD
DTA
STi0
STi1
STi2
STi3
R/W
C4i
F0i
DS
A0
A1
A2
A3
A4
A5
IC
IC
IC
IC
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
IC
ODE
STo0
STo1
STo2
STo3
IC
IC
IC
IC
VSS
D0
D1
D2
D3
D4
D5
D6
D7
CS
Data Sheet