XRT4500CV datasheet(47/99 Pages) EXAR

47 / 99 page

XRT4500

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MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

REV. 1.0.7

1.3.1

M[2:0] - The (Communication Interface)

Mode Control Select Pins.

As mentioned earlier, the XRT4500 is capable of sup-

porting each of the following “Communication Inter-

face” standards.

• ITU-T V.35

• ITU-T V.28 (EIA-232)

• EIA-449

• ITU-T V.36

• ITU-T X.21

• EIA-530

• EIA-530(A)

The XRT4500 can be configured to operate in either

one of these “Communication Interface” standards, by

setting the “M[2:0]” bit-fields to the appropriate val-

ues, as listed in Table 5.

NOTE: The M[2:0] input pins are internally pulled “high”. As

a consequence, the XRT4500 will automatically be config-

ured into the “POWER-DOWN” Mode, if the M[2:0] input

pins are left “floating”.

TABLE 5: THE RELATIONSHIP BETWEEN THE SETTINGS FOR THE M[2:0] BIT-FIELDS AND THE CORRESPONDING

COMMUNICATION INTERFACE THAT IS SUPPORTED

COMMUNICATION INTERFACE

COMMENTS

RS423 (V.10)

All Transmitters and Receivers are functioning in the V.10 Mode.

NOTE: This is not a standard Communication Interface.

EIA-530A (V.11)

EIA-530 (V.36)

RS449

010

X.21

011

V.35

100

Reserved

101

RS232 (V.28)

Power Down Mode

All Transmitters and Receivers are shut-off. Transmitter outputs are tri-stated

and all internal loads are disconnected. The charge pump and DC-DC con-

nect continues to operate.

XRT4500CV Datasheet(PDF) 47 Page - Exar Corporation

XRT4500CV Datasheet(HTML) 47 Page - Exar Corporation

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