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XRT73L00
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.2.0
50
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order
to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of
any circuits described herein, conveys no license under any patent or other right, and makes no represen-
tation that the circuits are free of patent infringement. Charts and schedules contained here in are only for
illustration purposes and may vary depending upon a user’s specific application. While the information in
this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where
the failure or malfunction of the product can reasonably be expected to cause failure of the life support sys-
tem or to significantly affect its safety or effectiveness. Products are not authorized for use in such applica-
tions unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury
or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corpo-
ration is adequately protected under the circumstances.
Copyright 2001 EXAR Corporation
Datasheet July 2001.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
REVISION HISTORY
Rev.P1.0.0 original
Rev. P1.0.1 Removed figures 34 &35, modified figures 3 & 4 to show timing more adequately
Rev. P1.0.2 modified figure 4 LCV signal
Rev. P1.0.3 added Device Monitor section to block diagram. Changed RxIN to RTIP/RRING in fig. 22.
Rev. P1.0.4 Transmit Digital Power Supply/Ground changed to Analog Power Supply/Ground
Rev. P1.0.5
Rev. P1.0.6 Figures 5,15,31,32 changed resistor values from 36ohms to 31.6ohms. Figure 16 changed
resistor value 37.5ohm to 37.4ohms. Changed the pin names in the pinout diagram and the pin descrip-
tions to include (A)nalog, (D)igital, (Rx)Receive, (Tx)Transmit on VDD and GND pins. Modified some of the
pin descriptions. Section 2.5 changed the resistor value from 36ohms to 31.6ohms. Revised Transformer
Vendor Information.
Rev 1.1.0 - Changed from preliminary to final
Rev 1.2.0 - Changed electrical characteristics tables for Transmit Output Pulse Amplitude (TxLev=0). STS-
1 min 0.65V from 0.68V, max 0.90V from 0.85V. DS3 min 0.65V from 0.68V.