XRT4500CV datasheet(25/99 Pages) EXAR

25 / 99 page

XRT4500

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MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

REV. 1.0.7

TX2B

SCTEB

RXCB

Transmitter 2 – Positive Data Differential Output to line.

The exact function of this output pin depends upon whether the

XRT4500 is operating in the DCE or DTE Mode.

DTE Mode Transmit Clock Echo (SCTE) – Positive Polarity

Output Signal

Transmitter 2 accepts a TTL level binary data system (as the

‘Transmit Clock Echo’ – SCTE) from the DTE terminal equip-

ment. Transmitter 2 converts this digital data into any of the fol-

lowing electrical formats: V10, V.11, V.28 or V.35 prior to

transmission to the line.

If this data is being converted into the V.11 or V.35 electrical format

then this pin outputs the ‘Positive Polarity’ portion of the ‘SCTE’

data to the line. If this data is being converted into the V.10 or V.28

electrical format, then this output pin is in-active.

DCE Mode Receive Clock (RXC) Signal – Positive Polarity

Output Line Signal

Transmitter 2 accepts a TTL level binary data system (as the

‘Receive Clock - RXC) from the DCE terminal equipment. Trans-

mitter 2 converts this digital data into any of the following electrical

formats: V.10, V.11, V.28 or V.35 prior to transmission to the line

If this data is being converted into the V.11 or V.35 electrical for-

mat then this pin outputs the ‘Positive Polarity’ portion of the

‘RXC’ data to the line. If this data is being converted into the V.10

or V.28 electrical format, then this output pin is in-active.

CM_TX2

Transmitter 2 Output Termination Center Tap in V.35 Mode –

This pin should be by-passed to ground with an external 0.1µF

capacitor.

Signal

DTE

MODE

DCE

MODE

TYPE

FUNCTION

XRT4500CV Datasheet(PDF) 25 Page - Exar Corporation

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