XRT75R06DIB datasheet(13/105 Pages) EXAR

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XRT75R06D

SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

REV. 1.0.0

CLOCK INTERFACE

LEAD #

SIGNAL NAME

TYPE

DESCRIPTION

E15

E3CLK

E3 Clock Input (34.368 MHz ± 20 ppm):

If any of the channels is configured in E3 mode, a reference clock 34.368 MHz

is applied on this pin.

NOTE: In single frequency mode, this reference clock is not required.

G16

DS3CLK

DS3 Clock Input (44.736 MHz ± 20 ppm):

If any of the channels is configured in DS3 mode, a reference clock 44.736

MHz. is applied on this pin.

NOTE: In single frequency mode, this reference clock is not required.

C16

STS-1CLK/

12M

STS-1 Clock Input (51.84 MHz ± 20 ppm):

If any of the channels is configured in STS-1 mode, a reference clock 51.84

MHz is applied on this pin..

In Single Frequency Mode, a reference clock of 12.288 MHz ± 20 ppm is con-

nected to this pin and the internal clock synthesizer generates the appropriate

clock frequencies based on the configuration of the channels in E3, DS3 or

STS-1 modes.

L15

SFM_EN

Single Frequency Mode Enable:

Tie this pin “High” to enable the Single Frequency Mode. A reference clock of

12.288 MHz ± 20 ppm is applied.

In the Single Frequency Mode (SFM) a low jitter output clock is provided for

each channel if the CLK_EN bit is set thus eliminating the need for a separate

clock source for the framer.

Tie this pin “Low” if single frequency mode is not selected. In this case, the

appropriate reference clocks must be provided.

NOTE:

This pin is internally pulled down

B17

T17

D11

P11

CLKOUT_0

CLKOUT_1

CLKOUT_2

CLKOUT_3

CLKOUT_4

CLKOUT_5

Clock output for channel 0

Clock output for channel 1

Clock output for channel 2

Clock output for channel 3

Clock output for channel 4

Clock output for channel 5

Low jitter clock output for each channel based on the mode selection (E3,DS3

or STS-1) if the CLKOUTEN_n bit is set in the control register.

This eliminates the need for a separate clock source for the framer.

NOTES:

The maximum drive capability for the clockouts is 16 mA.

This clock out is available both in SFM and non-SFM modes.

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