XRT83SL38IB datasheet(19/88 Pages) EXAR

19 / 88 page

XRT83SL38

REV. 1.0.2

OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

ALARM FUNCTIONS/REDUNDANCY SUPPORT

SIGNAL NAME

LEAD #

TYPE

DESCRIPTION

GAUGE

J18

Twisted Pair Cable Wire Gauge Select - Hardware Mode

Connect this pin “High” to select 26 Gauge wire. Connect this pin “Low” to select 22

and 24 gauge wire for all channels.

NOTE: Internally pulled “Low” with a 50k

Ω resistor.

DMO_0

DMO_1

DMO_2

DMO_3

DMO_4

DMO_5

DMO_6

DMO_7

C15

C13

U17

V14

Driver Failure Monitor Channel _0:

This pin transitions “High” if a short circuit condition is detected in the transmit driver of

Channel _0, or no transmit output pulse is detected for more than 128 TCLK_0 cycles.

Driver Failure Monitor Channel _1

Driver Failure Monitor Channel _2

Driver Failure Monitor Channel _3

Driver Failure Monitor Channel _4

Driver Failure Monitor Channel _5

Driver Failure Monitor Channel _6

Driver Failure Monitor Channel _7

ATAOS

µPCLK

T13

Automatic Transmit “All Ones” Pattern - Hardware Mode

A "High" level on this pin enables the automatic transmission of an "All Ones" AMI pat-

tern from the transmitter of any channel that the receiver of that channel has detected

an LOS condition. A "Low" level on this pin disables this function.

Note: All channels share the same ATAOS control function.

Microprocessor Clock Input - Host mode

SEE”MICROPROCESSOR CLOCK INPUT - HOST MODE:” ON PAGE 14.

NOTE: This pin is internally pulled “Low” for asynchronous microprocessor interface

when no clock is present.

TRATIO

INT

L16

Transmitter Transformer Ratio Select - Hardware mode

In external termination mode (TXTSEL = 0), setting this pin “High” selects a trans-

former ratio of 1:2 for the transmitter. A “Low” on this pin sets the transmitter trans-

former ratio to 1:2.45. In the internal termination mode the transmitter transformer

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

Interrupt Output - Host mode

This pin is asserted “Low” to indicate an alarm condition.

SEE”INTERRUPT OUT-

PUT - HOST MODE” ON PAGE 14.

NOTE: This pin is an open drain output and requires an external 10k

Ω pull-up resistor.

RESET

Hardware Reset (Active “Low”):

When this pin is tied “Low” for more than 10µs, the device is put in the reset state.

Exar recommends initiating a Hardware reset upon power up.

NOTE: This pin is internally pulled “High” with a 50k

Ω resistor.

SR/DR

Single-Rail/Dual-Rail Data Format:

Connect this pin “Low” to select transmit and receive data format in Dual-Rail mode. In

this mode, HDB3 or B8ZS encoder and decoder are not available.

Connect this pin “High” to select single-rail data format.

NOTE: Internally pulled “Low” with a 50k

Ω resistor.

XRT83SL38IB Datasheet(PDF) 19 Page - Exar Corporation

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