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XRT4500
(Rev.:2000)

MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

Exar Corporation 

XRT4500

MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

REV. 1.01

PIN DESCRIPTIONS

xr

PIN SYMBOL

#

11

TX4A

12

TX5A

13

TX5B

14

GND

DTE

MODE

RTSA

DTRA

DTRB

DCE

MODE

CTSA

TYPE FUNCTION

O Transmitter 4 – Negative Data Differential Output to Line

The XRT4500 accepts a TTL binary data stream from the Terminal

Equipment via the TX4D (pin 8) input pin. The XRT4500 will convert

this data into either the V.10, V.11 or V.28 modes, and will output it

via this pin and TX4B (pin 10). The exact function of this output pin

depends upon whether the XRT4500 device is operating in the

DTE or DCE mode.

DTE Mode – Negative Polarity portion of the RTS Line Signal.

DCE Mode – Negative Polarity portion of the CTS Line Signal.

DSRA

Note: This output pin is not used if the XRT4500 has been con-

figured to operate in either the V.35, V.28/EIA-232 or V.10

Modes.

O Transmitter 5 – Negative Data Differential Output to Line

The XRT4500 accepts a TTL binary data stream via the TX5D (pin

15) input pin. The XRT4500 will convert this data into either the V.11

or V.28 modes, and will output it via this pin and TX5B (pin 13). The

exact function of this output pin depends upon whether the

XRT4500 device is operating in the DTE or DCE mode.

DTE Mode – Negative Polarity portion of the DTR Line Signal.

Transmitter 5 accepts a TTL level binary data stream (as the

Data Terminal Read – DTR) from the terminal equipment.

DCE Mode – Negative Polarity portion of the DSR Line Signal.

DSRB

Note: This output pin is not used if the XRT4500 has been config-

ured to operate in either the V.35, V.28/EIA-232 or V.10 Modes.

O Transmitter 5 – Positive Data Differential Output to Line

The XRT4500 accepts a TTL binary data stream via the TX5D (pin

15) input pin. The XRT4500 will convert this data into either the V.11

or V.28 modes, and will output it via this pin and TX5A (pin 12). The

exact function of this output pin depends upon whether the

XRT4500 device is operating in the DTE or DCE mode.

DTE Mode – Positive Polarity portion of DTR Line signal.

DCE Mode – Positive Polarity portion of DSR Line signal.

Note: If the XRT4500 has been configured to operate in either the

V.35, V.28/EIA-232 or V.10 Modes, then all of the data will be out-

putted (to the line) in a single-ended manner, via this output pin.

Analog GND – For Transmitters 4, 5, 6, 7, and 8.

6

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