XRT83SL30 データシートの表示（PDF） - Exar Corporation

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XRT83SL30

SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

Exar Corporation 

XRT83SL30

SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

REV. 1.0.1

REDUNDANCY SUPPORT

SIGNAL NAME

PIN #

DMO

11

TYPE

O

DESCRIPTION

Driver Failure Monitor

This pin transitions "High" if a short circuit condition is detected in the trans-

mit driver, or no transmit output pulse is detected for more than 128 TCLK

cycles.

TERMINATIONS

SIGNAL NAME

GAUGE

TRATIO

RXTSEL

PIN #

49

26

44

TYPE

DESCRIPTION

I Twisted Pair Cable Wire Gauge Select

In Hardware Mode, connect this pin "High" to select 26 Gauge wire. Connect this pin

“Low” to select 22 and 24 gauge wire.

NOTE: Internally pulled “Low” with a 50kΩ resistor.

I Transmitter Transformer Ratio Select

In Hardware Mode, in external termination mode (TXTSEL = “0”), setting this pin "High"

selects a transformer ratio of 1:2 for the transmitter. A "Low" on this pin sets the transmit-

ter transformer ratio to 1:2.45. In the internal termination mode the transmitter trans-

former ratio is permanently set to 1:2 and the state of this pin is ignored.

NOTE: Internally pulled "Low" with a 50kΩ resistor.

I Receiver Termination Select

In Hardware Mode when this pin is “Low” the receive line termination is determined only

by the external resistor. When “High”, the receive termination is realized by internal

resistors or the combination of internal and external resistors according to RXRES[1:0].

These conditions are described in the following table:

RXTSEL

0

1

RX Termination

External

Internal

In Host Mode bit 7 in Control Register 1 (01h) determines if the if the receiver termina-

tion is external or internal. The function of RXTSEL can be transferred to the harware pin

by setting TERCNTL bit (bit 4)

NOTE: This pin is internally pulled "Low" with a 50kΩ resistor.

TXTSEL

45

I Transmit Termination Select

In Hardware Mode when this pin is “Low” the transmit line termination is determined

only by external resistor. When “High”, the transmit termination is realized only by an

internal resistor. These conditions are summarized in the following table:

TXTSEL

0

1

TX Termination

External

Internal

NOTE: This pin is internally pulled "Low" with a 50kΩ resistor.

11

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