XRT82L24 datasheet(10/43 Pages) EXAR

10 / 43 page

XRT82L24

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QUAD E1 LINE TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

REV. 1.2.3

INT

Interrupt Output.

This pin is asserted Low to indicate an alarm condition has occurred within the

device. Interrupt generation can be globally disabled by setting the GIE bit to a

"0" in the command control register.

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

Ω pull-up

resistor.

ICT

In-Circuit Testing (Active Low).

When this pin is tied Low, all output pins are forced to high impedance state for

in-circuit testing.

NOTE: Internally pulled -up with 50k

Ω.

LOOPSEL

DLoop-back Mode Select.

In Hardware Mode, if LOOPEN_(0-3) is “High”, this pin is used for selecting

loop-back mode. Connect this pin "High" to select local loop-back and Low to

select remote loop-back. Digital Loop-back is not supported in Hardware Mode.

LOOPEN_0

LOOPEN_1

LOOPEN_2

LOOPEN_3

Loop-back Enable - Channel_n:

In Hardware Mode:

Connect this pin “High” to enable channel_n loop-back operation. Remote or

local loop-back is determined by pin 58 setting.

FIFOS

FIFO Size Select.

In Hardware Mode, connect this pin "High" selects 64 bit FIFO depth and con-

nect Low to select 32 bit FIFO depth.

POWER SUPPLIES AND GROUNDS

AVDD

****

Analog Positive Supply(3.3V± 5%)

DVDD

****

Digital Positive Supply(3.3V± 5%)

DVDD

****

Digital Positive Supply(3.3V± 5%)

TVDD_0

TVDD_1

TVDD_2

TVDD_3

****

Transmitter_n Analog Positive Supply(3.3V± 5%).

AVDD

****

Analog Positive Supply(3.3V± 5%)

DVDD

****

Digital Positive Supply(3.3V± 5%)

DVDD

****

Digital Positive Supply(3.3V± 5%)

DVDD

****

Digital Positive Supply(3.3V± 5%)

AGND

****

Analog Ground

DGND

****

Digital Ground

DGND

****

Digital Ground

DGND

****

Digital Ground

TGND_0

TGND_1

TGND_2

TGND_3

****

Transmitter_n Analog Ground.

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

XRT82L24 Datasheet(PDF) 10 Page - Exar Corporation

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