XRT5894 查看數據表（PDF） - Exar Corporation

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产品描述 (功能)

比赛名单

XRT5894

Four-Channel E1 Line Interface (3.3V or 5.0V)

Exar Corporation 

XRT5894

Disabling Output Drivers

Output drivers may be individually disabled (hi-z output) by either of the following methods.

1. Either connect the transmit data inputs TXPOS

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).

TRANSFORMER REQUIREMENTS

2. Connect TXCLK for the channel to be disabled to

logic 0 source (Ground), and also apply data to the

TXPOS and TXNEG inputs of that channel.

Turns Ratio

1:2 CT

Line Impedance

75W or 120W

Turns Ratio

1:2

Line Impedance

75W or 120W

Table 1. Input Transformer Requirements

Table 2. Output 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

Rev. 1.10

8

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