XRT4500CV datasheet(27/99 Pages) EXAR

27 / 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

GND

Analog GND: Receivers 4, 5, 6, 7 and 8

RX3D

D_TXC

D_X

Receiver 3 – Digital Output to Terminal Equipment:

This output pin is the digital (CMOS level) representation of the

line signal that is received via the TR3A (pin 70) and TR3B (pin

71) input pins.

The exact role that this pin plays depends upon whether the

XRT4500 is operating in the DCE or DTE Mode.

DTE Mode: TXC – Transmit Clock Signal

This output pin functions as the “TXC” (Transmit Clock) output

signal to the Terminal Equipment. The DTE Terminal Equipment

will typically use this signal to synthesize the SCTE clock signal.

DCE Mode: This output pin is NOT used.

Note: If the “Internal Oscillator” (within the XRT4500) is enabled,

then this pin will output a 32kHz to 64kHz clock signal. This clock

signal can be used for “Stand-Alone DTE Diagnostic” Testing.

RX2D

R_RXC

D_SCTE

Receiver 2 – Digital Data Output to Equipment

This output pin is the digital (CMOS level) representation of the

line signal that is received via the RX2A (pin 77) and RX2B (pin

76) input pins.

The exact role that this pin plays depends upon whether the

XRT4500 is operating in the DCE or DTE Modes.

DCE Mode: SCTE – Transmit Clock Echo Signal:

This output pin functions as the SCTE (Transmit Clock Echo)

output signal to the Terminal Equipment. The DCE Terminal

Equipment will typically use this clock signal to sample the “TXD”

(Transmit Data).

DTE Mode: RXC – Receive Clock Signal:

This output pin functions as the “RXC” (Receive Clock) output

signal to the Terminal Equipment. The DTE Terminal Equipment

will typically use this signal to sample the “RXD” (Receive Data).

Note: If the “Internal Oscillator” (within the XRT4500) is enabled,

then this pin will output a 32kHz – 64kHz clock signal. This clock

signal can be used for “Stand-Alone DTE Diagnostic” testing.

EN_FLTR

Enable Glitch Filter on Receiver 4, 5, 6, 7, 8 inputs. Internal

20k

Ω pull-down

RX2B

RXCB

SCTEB

Receiver 2 – Positive Data Differential Input from Line

RX2A

RXCA

RXCB

Receiver 2 – Negative Data Differential Input from Line

XRT4500CV Datasheet(PDF) 27 Page - Exar Corporation

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