MT9174
Advance Information
24 PIN PDIP/ SSOP
Figure 2 - Pin Connections
Pin Description
Pin #
Name
24
1
2
3
4,5,
6
7
8
28
2
3
4
5,7,
8
9
11
L
OUT
V
Bias
V
Ref
Line Out.
Transmit Signal output (Analog). Referenced to V
Bias
.
Internal Bias Voltage
output. Connect via 0.33 µF decoupling capacitor to V
DD
.
Internal Reference Voltage
output. Connect via 0.33 µF decoupling capacitor to V
DD
.
Description
MS2-MS0
Mode Select
inputs (Digital). The logic levels present on these pins select the various
operating modes for a particular application. See Table 1 for the operating modes.
RegC
RxSB
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.
Receive Sync Bit
output (Digital). This output is held high until receive
synchronization occurs (i.e., until the sync bit in Status Register =1). Once low,
indicating synchronized transmission, a high going pulse (6.24
µs
wide pulse @ 160
kb/s and 12.5
µs
wide @ 80 kb/s) indicates the temporal position of the receive
"SYNC" bit in the biphase line transmission.
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).
Data ST-BUS Out/Data Out
(Digital). A 2.048 Mbit/s serial PCM/data output in DN
mode. 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.
9
10
F0/CLD
10
12
CDSTi/
CDi
CDSTo/
CDo
V
SS
DSTo/Do
DSTi/Di
11
13
12
13
14
14
15
16
9-156
CDSTi/CDi
CDSTo/CDo
VSS
DSTo/Do
DSTi/Di
F0o/RCK
NC
LOUT
VBias
VRef
MS2
MS1
MS0
RegC
RxSB
F0/CLD
CDSTi/CDi
CDSTo/CDo
VSS
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VDD
LIN
TEST
LOUT DIS
Precan
OSC1
NC
OSC2
C4/TCK
F0o/RCK
DSTi/Di
DSTo/Do
4
3
2
1
28
27
26
•
VRef
VBias
LOUT
NC
VDD
LIN
TEST
12
13
14
15
16
17
18
MS2
NC
MS1
MS0
RegC
F0/CLD
RxSB
5
6
7
8
9
10
11
25
24
23
22
21
20
19
NC
LOUT DIS
Precan
OSC1
OSC2
NC
C4/TCK
28 PIN PLCC
MITEL [ MITEL NETWORKS CORPORATION ]
