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XRT4500
(Rev.:2000)

MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

Exar Corporation 

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PIN DESCRIPTIONS

XRT4500

MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

REV. 1.01

PIN SYMBOL

#

DTE

MODE

DCE TYPE FUNCTION

MODE

60

TX1D

D_TXD D_RXD

I Transmitter 1 – Digital Data Input from Terminal Equipment.

The exact role that this input pin plays depends upon whether

the XRT4500 is operating in the DTE or DCE Modes.

DTE Mode – TXD (Transmit Data) Input:

The DTE Terminal Equipment is expected to input the TXD

(Transmit Data) via this input pin.

The XRT4500 will convert this binary data stream into either the

V.35, V.11, or V.28 format and will output this data via the TX1A

and TX1B output pin.

DCE Mode – RXD (Receive Data) Input:

The DCE Terminal Equipment is expected to input the RXD

(Receive Data) via this input pin.

The XRT4500 will convert this binary data stream into either the

V.35, V.11 or V.28 format and will output this data via the TX1A

and TX1B output pins.

61

CM_TX1

O AC GND- Transmitter 1 Output Termination center tap in V.35

Mode. Connect a 0.1µF capacitor to ground.

62

TX1B

TXDB RXDB

O Transmitter 1 – 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 Modes.

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

Line Signal

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

“Transmit Data” – TXD) from the DTE 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 transmis-

sion to the line.

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

then this pin outputs the positive-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 will output this data to the line, in a

single-ended manner.

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

Line Signal

Transmitter 1 accepts a CMOS (or TTL) level signal 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 positive 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.

19

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