XRT4500 datasheet(13/99 Pages) EXAR

13 / 99 page

XRT4500

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MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

REV. 1.0.7

PIN DESCRIPTIONS (CONT.)

Signal

DTE

MODE

DCE

MODE

TYPE

FUNCTION

RX8I

RIA

RLA

Receiver 8 – Line Input Pin:

This input pin accepts either a V.10 or V.28 type signal from the

line. Receiver 8 will then convert this signal into a “CMOS” level

(digital) signal and output this signal to the Terminal Equipment

via the RX8D output pin (Pin 23). The exact function of this out-

put pin depends upon whether the XRT4500 device is operating

in the DTE or DCE mode.

DTE Mode – The RI line signal

DCE Mode – The RL line signal

Notes:

1. For some DTE applications, this input pin would accept

the “RI” (Ring Indicator) line signal (in either the V.10 or

V.28 format) form the DCE Terminal Equipment.

2. For some DCE applications, this input pin would accept the

“RL” (Remote Loop-back”) line signal (in either the V.10 or

the V.28 format) from the DTE Terminal Equipment.

VSS

-6V Power: This supply voltage is internally generated by the

Switching Regulator Circuit within the XRT4500. The -6V is used

by receivers 4, 5, 6, 7 and 8. If a -6V supply is available, then the

external components can be eliminated.

TR7

LLA

I/0

Transceiver # 7 I/O Pins

The exact function of this pin depends upon whether the

XRT4500 is operating in the DCE or DTE Modes.

DTE Mode – Transmitter 7 – Single Ended Data Output to Line

Transceiver 7 accepts a CMOS level signal via the “TX76D” input

pin (pin 28). This digital data is converted into either a V.10 or

V.28 electrical signal; which is then output (via this pin), on the

line to the Remote Terminal Equipment.

DCE Mode – Receiver 7 – Single Ended Data Input from Line

This input pin accepts the line signal, from the Remote Terminal

Equipment, in a “single-ended” manner. This line signal is con-

verted into a CMOS level signal and is output (to the local Termi-

nal Equipment) via the “RX67D” output pin (Pin 32).

TX76D

D_LL

D_DCD

Digital Input – Refer to Mode Control Tables, Table 3 & Table 4 .

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