SM802121UMGTR datasheet(3/10 Pages) MICREL

Il numero della parte	SM802121UMGTR

Spiegazioni elettronici	ClockWorks10GbE (156.25MHz), Ultra-Low Jitter, LVPECL Frequency Synthesizer

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Produttore elettronici	MICREL [Micrel Semiconductor]

Homepage	http://www.micrel.com

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Micrel, Inc.

SM802121

January 2012

3

M9999-011212-A

hbwhelp@micrel.com or (408) 955-1690

Pin Description

Pin Number

Pin Name

Pin Type

Pin Level

Pin Function

16, 17

/Q, Q

O, (DIF)

LVPECL

Differential Clock Output 156.25MHz.

1, 18

VDDO

PWR

Power Supply for Output.

2, 22

VSSO

PWR

Power Supply Ground for Output.

6

XTAL_SEL

I, (SE)

LVCMOS

Selects PLL Input Reference Source (0 = REF_IN, 1 =

XTAL, 45KΩ pull-up).

3, 4, 20, 21,

23, 24

NC

No Connect. Do not connect anything to these pins.

5, 7, 12, 15, 19

TEST

Factory Test Pins. Do not connect anything to these pins.

8

VDD

PWR

Core Power Supply.

13, 14

VSS

(Exposed Pad)

PWR

Core Power Supply Ground. The exposed pad must be

connected to the VSS ground plane.

9

REF_IN

I, (SE)

LVCMOS

Reference Clock Input.

10

XIN

I, (SE)

crystal

Crystal Reference Input. No load caps needed. (See Fig. 5)

11

XOUT

O, (SE)

crystal

Crystal Reference Output. No load caps needed. (See Fig. 5)

Application Information

Input Reference

When operating with a crystal input reference, do not

apply a switching signal to REF_IN.

Crystal Layout

Keep the layers under the crystal as open as possible

and do not place switching signals or noisy supplies

under the crystal.

Crystal load capacitance is built inside the die so no

external capacitance is needed. See the Selecting a

quartz crystal for the Clockworks Flex I Family of

Precision Synthesizers

application note for further

details.

Contact Micrel’s HBW applications group if you need

assistance on selecting a suitable crystal for your

application at hbwhelp@micrel.com

Truth Table

XTAL_SEL

INPUT

0

REF_IN

1

XTAL

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