MT8972B Mitel Networks Corporation, MT8972B Datasheet - Page 2

• Manufacturer Part Number: MT8972B
• Description: (MT8971B) ISO2-CMOS ST-BUS FAMILY Digital Subscriber Interface Circuit Digital Network Interface Circuit
• Manufacturer: Mitel Networks Corporation

MT8971B/72B
Pin Description
9-108
DIP PLCC
4,5,
10
12
13
14
15
16
11
1
2
3
6
7
8
9
Pin #
5,7,
10
12
13
14
15
16
17
19
21
2
3
4
8
9
CDSTo/CDo
CDSTi/CDi
MS2-MS0 Mode Select inputs (Digital). The logic levels present on these pins select the various
F0o/RCK Frame Pulse Out/Receive Bit Rate Clock output (Digital). In DN mode a 244 ns wide
DSTo/Do Data ST-BUS Out/Data Out (Digital). A 2.048 Mbit/s serial PCM/data output in DN mode.
C4/TCK
F0/CLD
CDSTo/
DSTi/Di
CDSTi/
F0/CLD
OSC2
RegC
Name
L
V
CDo
LOUT
VBias
V
RegC
CDi
V
VRef
MS2
MS1
MS0
OUT
VSS
Bias
Ref
SS
22 PIN PDIP/CERDIP
10
11
1
2
3
4
5
6
7
8
9
Line Out. Transmit Signal output (Analog). Referenced to V
Internal Bias Voltage output. Connect via 0.33 µF decoupling capacitor to V
Internal Reference Voltage output. Connect via 0.33 µF decoupling capacitor to V
operating modes for a particular application. See Table 1 for the operating modes.
Regulator Control output (Digital). A 512 kHz clock used for switch mode power
supplies. Unused in MAS/MOD mode and should be left open circuit.
Frame Pulse/C-Channel Load (Digital). In DN mode a 244 ns wide negative pulse input
for the MASTER indicating the start of the active channel times of the device. Output for
the SLAVE indicating the start of the active channel times of the device. Output in MOD
mode providing a pulse indicating the start of the C-channel.
Control/Data ST-BUS In/Control/Data In (Digital). A 2.048 Mbit/s serial control &
signalling input in DN mode. In MOD mode this is a continuous bit stream at the bit rate
selected.
Control/Data ST-BUS Out/Control/Data Out (Digital). A 2.048 Mbit/s serial control &
signalling output in DN mode. In MOD mode this is a continuous bit stream at the bit rate
selected.
Negative Power Supply (0V).
In MOD mode this is a continuous bit stream at the bit rate selected.
Data ST-BUS In/Data In (Digital). A 2.048 Mbit/s serial PCM/data input in DN mode. In
MOD mode this is a continuous bit stream at the bit rate selected.
negative pulse indicating the end of the active channel times of the device to allow daisy
chaining. In MOD mode provides the receive bit rate clock to the system.
Data Clock/Transmit Baud Rate Clock (Digital). A 4.096 MHz TTL compatible clock
input for the MASTER and output for the SLAVE in DN mode. For MOD mode this pin
provides the transmit bit rate clock to the system.
Oscillator Output. CMOS Output.
22
21
20
19
18
17
16
15
14
13
12
VDD
LIN
TEST
LOUT DIS
Precan
OSC1
OSC2
C4/TCK
F0o/RCK
DSTi/Di
DSTo/Do
Figure 2 - Pin Connections
Description
F0/CLD
RegC
MS2
MS1
MS0
NC
NC
5
6
7
8
9
10
11
28 PIN PLCC
Bias
.
25
24
23
22
21
20
19
NC
LOUT DIS
Precan
OSC1
OSC2
C4/TCK
NC
DD
.
DD
.