MT9044AL Zarlink, MT9044AL Datasheet - Page 25

• Manufacturer Part Number: MT9044AL
• Description: Framer E1/OC3/T1 5V 44-Pin MQFP
• Manufacturer: Zarlink

Specifications of MT9044AL

• Package: 44MQFP
• Maximum Data Rate: 2.048 Mbps
• Number Of Transceivers: 1
• Standard Framing Format: E1|OC3|T1
• Maximum Supply Current: 90 mA
• Minimum Single Supply Voltage: 4.5 V
• Maximum Single Supply Voltage: 5.5 V

Dual E1 Reference Sources with MT9044 in Manual Control
For systems requiring complex state machine control, the application circuit shown in Figure 16 using Manual
Control may be used.
In this circuit, the MT9044 is operating Manually and is using a controller for all mode changes. The controller sets
the MT9044 modes (Normal, Holdover or Freerun) by controlling the MT9044 mode/control select pins (MS2 and
MS1). The input (Primary or Secondary) is selected with the reference select pin (RSEL). TIE correction from
Primary Holdover Mode to Primary Normal Mode is enabled and disabled with the guard time input pin (GTi). The
input to output phase alignment is re-aligned with the TIE circuit reset pin (TCLR), and a complete device reset is
done with the RST pin.
The controller uses two stimulus inputs (LOS) directly from the MT9075 E1 interfaces, as well as an external
stimulus input. The external input may come from a device that monitors the status registers of the E1 interfaces,
and outputs a logic one in the event of an unacceptable status condition.
External Stimulus
RX Line
RX Line
To Line 1
TX Line
TX Line
To Line 2
XFMR
XFMR
XFMR
XFMR
To
To
To
To
Figure 16 - Dual E1 Reference Sources with MT9044 in 8 kHz Manual Control
TTIP
TRING
RTIP
RRING
TTIP
TRING
RTIP
RRING
MT9075
MT9075
MT8985
RxFP
RxFP
DSTo
DSTo
STo0
STo1
DSTi
DSTi
LOS
LOS
STi0
STi1
C4i
C4i
C4i
F0i
F0i
F0i
Zarlink Semiconductor Inc.
MT9044
25
CONTROLLER
SEC
PRI
LOS1
LOS2
TRST
RST
MS1
MS2
RSEL
MT9044
C1.5o
OSCi
C4o
FS1
FS2
F0o
GTi
+ 5 V
Out
20 MHz
Data Sheet
CLOCK
±
32 ppm