xrt5894 Exar Corporation, xrt5894 Datasheet - Page 8
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xrt5894
Manufacturer Part Number
xrt5894
Description
Four-channel E1 Line Interface 3.3v Or 5.0v
Manufacturer
Exar Corporation
Datasheet
1.XRT5894.pdf
(19 pages)
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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
XRT5894:
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. (415) 568-5800
Fax. (415)568-6161
Pulse
Telecom Product Group
P.O. Box 12235
San Diego, CA 92112
Tel. (619) 674-8100
Fax. (619) 674-8262
Transpower Technologies, Inc.
24 Highway 28, Suite 202
Crystal Bay, NV 89402--0187
Tel. (702) 831--0140
Fax. (702) 831--3521
XRT5894
1. Either connect the transmit data inputs TXPOS
Rev. 1.10
Table 1. Input Transformer Requirements
and TXNEG for the channel to be disabled to a log-
ic 1 source (VCC), or allow them to float (inputs
have internal pull--up resistors).
Turns Ratio
1:2 CT
Line Impedance
75W or 120W
8
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