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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

#

35

RX5B

36

RX5A

37

RX4A

38

RX4B

DTE

MODE

DSRB

DSRA

CTSA

CTSB

DCE

MODE

DTRB

TYPE FUNCTION

I Receiver 5 – Positive Data Differential Input from Line

The XRT4500 will accept either a V.10, V.11 or V.28 type signal

via this input pin, along with RX5A (Pin 36) and will generate a

resulting CMOS level binary data stream, via the RX5D (Pin 33)

output pin. The exact function of this input pin depends upon

whether the XRT4500 device is operating in the DTE or DCE

mode.

DTE Mode – Positive polarity portion of the DSR line signal.

DCE Mode – Positive polarity portion of the DTR line signal.

DTRA

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-

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

I Receiver 5 – Negative Data Differential Input from Line

The XRT4500 will accept either a V.10, V.11 or V.28 type signal

via this input pin, along with RX5B (pin 35) and will generate a

resulting CMOS level binary data stream, via the RX5D (Pin 33)

output pin. The exact function of this input pin depends upon

whether the XRT4500 device is operating in the DTE or DCE

mode.

DTE Mode – Negative polarity portion of the DSR line signal.

DCE Mode – Negative polarity portion of the DTR line signal.

RTSA

Note: This input 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.

I Receiver 4 – Negative Data Differential Input from Line

The XRT4500 will accept either a V.11 or V.28 type signal via

this input pin, along with RX4B (pin 38) and will generate a

resulting CMOS level binary data stream, via the RX4D output

pin (Pin 40). The exact function of this input pin depends upon

whether the XRT4500 device is operating in the DTE or DCE

mode.

RTSB

Note: This input 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.

I Receiver 4 – Positive Data Differential Input from Line

The XRT4500 will accept either a V.11 or V.28 type signal via

this input pin, along with RX4A (pin 37) and will generate a

resulting CMOS level binary data stream, via the RX4D output

pin (Pin 40). The exact function of this input pin depends upon

whether the XRT4500 device is operating in the DTE or DCE

mode.

NOTE: Symbol names beginning with D_ are digital signals.

NOTE: Symbol names ending with B and A are the positive and negative polarities of differential signals respectively.

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