xrt5897 Exar Corporation, xrt5897 Datasheet - Page 10

• Manufacturer Part Number: xrt5897
• Description: Xrt5897 -seven-channel E1 Line Interface
• Manufacturer: Exar Corporation

Disabling Output Drivers
Output drivers may be individually disabled (hi-z output) by either of the following methods.
TRANSFORMER REQUIREMENTS
Note:
The same type 1:2 CT ratio device may be used at both receiver input and transmitter output.
The following transformers have been tested with the XRT5897:
HALO type TG26-1205(package contains two 1 CT:2 CT ratio transformers)
Pulse type PE-65535 (1:2 CT ratio)
Transpower Technologies type TTI 7154-R (1:2 CT ratio)
Magnetic Supplier Information:
HALO Electronics, Inc.
P.O. Box 5826
Redwood City, CA 94063
Tel. [phone]
Fax. [phone]
Pulse
Telecom Product Group
P.O. Box 12235
San Diego, CA 92112
Tel. [phone]
Fax. [phone]
Transpower Technologies, Inc.
24 Highway 28, Suite 202
Crystal Bay, NV 89402--0187
Tel. [phone]
Fax. [phone]
XRT5897
1. Either connect the transmit data inputs TXPOS
Rev. 1.11
Table 1. Input Transformer Requirements
and TXNEG for the channel to be disabled to a log-
ic 1 source (V
have internal pull--up resistors).
Turns Ratio
1:2 CT
CC
), or allow them to float (inputs
Line Impedance
75W or 120W
10
2. Connect TXCLK for the channel to be disabled to
Table 2. Output Transformer Requirements
logic 0 source (Ground), and also apply data to the
TXPOS and TXNEG inputs of that channel.
Turns Ratio
1:2
Line Impedance
75W or 120W