MH89770 Datasheet, PDF (2/36 Pages) Mitel Networks Corporation – T1/ESF Framer & Interface Preliminary Information

MH89770
Preliminary Information
NC 2
E1.5o 3
VDD 4
RxA 5
RxT 6
RxR 7
RxB 8
NC 9
CSTi1 10
CSTi0 11
E8Ko 12
XCtl 13
XSt 14
CSTo 15
NC 16
DSTi 17
C2i 18
E1.5o 19
F0i 20
40 NC
39 _NC
38 LOS
37 NC
36 _TxFDL
35 NC
34 TxFDLClk
33 VSS
32 RxFDLClk
31 DSTo
30 RxFDL
29 OUTB
28 C1.5i
27 RxSF
26 _TxSF
25 _OUTA
24 _NC
23 _NC
22 NC
21 _VSS
Pin Description
Pin #
Name
2
NC
3
E1.5o
4
V_DD
5
RxA
6
RxT
7
RxR
8
RxB
9
NC
10
CSTi1
11
CSTi0
12
E8Ko
13
XCtl
14
XSt
15
CSTo
16
NC
Figure 2 - Pin Connections
Description
No Connection.
1.544 MHz Extracted Clock (Output): This clock is extracted by the device from the
received DS1 signal. It is used internally to clock in data received at RxT and RxR.
System Power Supply. +5V.
Received A (Output): The bipolar DS1 signal received by the device at RxR and RxT is
converted to a unipolar format and output at this pin.
Receive Tip and Ring Inputs: Bipolar split phase inputs designed to be connected
directly to the input transformer. Impedance to ground is approximately 1kΩ.
Impedance between pins=430Ω.
Received B (Output): The bipolar DS1 signal received by the device at RxR and RxT is
converted to a unipolar format and output at this pin.
No Connection.
Control ST-BUS Input #1: A 2048 kbit/s serial control stream which carries 24
per-channel control words.
Control ST-BUS Input #0: A 2048 kbit/s serial control stream that contains 24 per
channel control words and two master control words.
8 kHz Extracted Clock (Output): This is an 8 kHz output generated by dividing the
extracted 1.544 MHz clock by 193 and aligning it with the received DS1 frame. The 8
kHz signal can be used for synchronizing system clocks to the extracted 1.544 MHz
clock. When digital loopback is enabled, the 8kHz is derived from C1.5.
External Control (Output): This is an uncommitted external output pin which is set or
reset via bit 3 in Master Control Word 1 on CSTi0. The state of XCtl is updated once per
frame.
External Status (Schmitt Trigger Input): The state of this pin is sampled once per
frame and the status is reported in bit 5 of Master Status Word 2 on CSTo.
Control ST-BUS Output: This is a 2048 kbit/s serial control stream which provides the
24 per-channel status words, and two master status words.
No Connection.
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