XRT4500CV datasheet(23/99 Pages) EXAR

23 / 99 page

XRT4500

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MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

REV. 1.0.7

PIN DESCRIPTIONS (CONT.)

Signal

DTE

MODE

DCE

MODE

TYPE

FUNCTION

TX1A

TXDA

RXDA

Transmitter 1 – Negative Data Differential Output to Line

The exact function of this output pin depends upon whether the

XRT4500 is operating in the DCE or DTE Modes.

DTE Mode: Transmit Data (TXD) – Negative Polarity Output

Signal

Transmitter 1 accepts a TTL level binary data stream (as the

“Transmit Data” – TXD) from the DTE Terminal Equipment. Trans-

mitter 1 converts this digital data into any of the following electrical

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

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

then this pin outputs the negative-polarity portion of the “TXD”

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

or V.28 formats, then this pin outputs this data to the line in a sin-

gle-ended manner.

DCE Mode: Receive Data (RXD) – Negative Polarity Output

Line Signal

Transmitter 1 accepts a TTL level binary data stream (as the

“Receive Data” – RXD) from the DCE Terminal Equipment.

Transmitter 1 converts this digital data into any of the following

electrical formats: V.10, V.11, V.28 and V.35 prior to transmission

to the line.

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

then this pin outputs the negative-polarity portion of the “RXD”

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

or V.28 formats, then this pin outputs this data to the line in a sin-

gle-ended manner.

XRT4500CV Datasheet(PDF) 23 Page - Exar Corporation