XRT4500CV datasheet(17/99 Pages) EXAR

17 / 99 page

XRT4500

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MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

REV. 1.0.7

PIN DESCRIPTIONS (CONT.)

NOTE: Signal names beginning with D_ are digital signals.

NOTE: Signal names ending with B and A are the positive

and negative polarities of differential signals respectively.

Signal

DTE

MODE

DCE

MODE

TYPE

FUNCTION

RX5B

DSRB

DTRB

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 result-

ing 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.

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

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

RX5A

DSRA

DTRA

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.

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

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

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

RX4A

CTSA

RTSA

Receiver 4 – 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 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.

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

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

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

RX4B

CTSB

RTSB

Receiver 4 – 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 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: This output pin is not used if the XRT4500 has been con-

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

XRT4500CV Datasheet(PDF) 17 Page - Exar Corporation

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