XRT91L31 查看數據表（PDF） - Exar Corporation

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XRT91L31

STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER

Exar Corporation 

XRT91L31

STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER

TRANSMITTER SECTION

REV. 1.0.2

NAME

LEVEL

TYPE

PIN

DESCRIPTION

REFCLKP

LVPECL Diff

I

REFCLKN

16 Reference Clock Input (77.76 MHz or 19.44 MHz)

17 This differential clock input reference is used for the transmit

clock multiplier unit (CMU) and clock data recovery (CDR) to

provide the necessary high speed clock reference for this

device. It will accept either a 77.76 MHz or a 19.44 MHz Differ-

ential LVPECL clock source. Pin CMUFREQSEL determines

the value used as the reference. See Pin CMUFREQSEL for

more details. REFCLKP/N inputs are internally biased to 1.65V.

NOTE: In the event that TTLREFCLK LVTTL input is used

instead of these differential inputs for clock reference,

the REFCLKP should be tied to ground.

TTLREFCLK

LVTTL,

I

LVCMOS

36 Auxillary Reference Clock Input (77.76 MHz or 19.44 MHz)

This LVTTL clock input reference is used for the transmit clock

multiplier unit (CMU) and clock data recovery (CDR) to provide

the necessary high speed clock reference for this device. It will

accept either a 77.76 MHz or a 19.44 MHz LVTTL clock source.

Pin CMUFREQSEL determines the value used as the refer-

ence. See Pin CMUFREQSEL for more details.

NOTE: In the event that REFCLKP/N differential inputs is used

instead of this LVTTL input for clock reference, the

TTLREFCLK should be tied to ground.

10

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