XRT4500CV datasheet(11/99 Pages) EXAR

11 / 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

Loopback Command Input Pin – Active Low:

This active-low input pin permits the user to configure the

XRT4500 into a “Loop-Back” Mode. The exact loop-back will

depend upon whether the XRT4500 is operating in the DTE or

DCE Modes.

Setting this input pin to “LOW” enables the Loop-back Operation.

Setting this input pin to “HIGH” disables the Loop-back Operation.

This input pin contains an Internal 20K

Ω pull-up to VDD.

TX8O

RLA

RIA

Transmitter 8 – Single Ended Data Output to Line

The XRT4500 accepts a TTL level binary data stream, from the

local terminal equipment via the “TX8D” input pin (pin 17), and

outputs it, in either a V.10 or V.28 manner via this output pin. The

exact role that this output pin plays depends upon whether the

XRT4500 is operating in the DTE or DCE Modes.

If the XRT4500 is configured to operate in the DCE Mode:

This output pin will typically drive the state of either the “RI”

(Ring Indicator) or “TM” (Test Mode) signals to the Remote

Terminal Equipment.

If the XRT4500 is configured to operate in the DTE Mode:

This output pin will typically drive the state of the “RL” (Remote

Loop-back) signal to the Remote Terminal Equipment.

VDD

Analog VDD – For Receivers 4, 5, 6, 7 and 8.

CPP

Charge Pump Capacitor Pin: A 2.2µF tantalum capacitor must

be connected between pin 21 and pin 22.

CPM

Charge Pump Capacitor Pin: A 2.2µF tantalum capacitor must

be connected between pin 21 and pin 22.

XRT4500CV Datasheet(PDF) 11 Page - Exar Corporation

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