ICS843256BGLF datasheet(1/16 Pages) IDT

Part #	ICS843256BGLF

Description	FemtoClock Crystal-to-3.3V LVPECL Frequency Synthesizer With/Integrated Fanout Buffer

PDF	16 Pages

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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FemtoClock

® Crystal-to-3.3V LVPECL

Frequency Synthesizer With/Integrated Fanout Buffer

843256

DATASHEET

843256 REVISION B DECEMBER 18, 2014

1

GENERAL DESCRIPTION

The 843256 is a Crystal-to-3.3V LVPECL Clock Synthesizer/Fanout

Buffer designed for Fibre Channel and Gigabit Ethernet applications.

The output frequency can be set using the frequency select pins and

a 25MHz crystal for Ethernet frequencies, or a 19.44MHz crystal for

SONET. The low phase noise characteristics of the 843256 make it

an ideal clock for these demanding applications.

FEATURES

• Six 3.3V differential LVPECL output pairs

• Output frequency range: 62.5MHz to 625MHz

• Crystal input frequency range: 15.625MHz to 25.5MHz

• RMS phase jitter at 156.25MHz, using a 25MHz crystal

(1.875MHz to 20MHz): 0.41ps (typical) @ 3.3V

• Operating supply modes:

Core/Output

3.3V/3.3V

3.3V/2.5V

• 0°C to 70°C ambient operating temperature

• Available in lead-free (RoHS 6) package

BLOCK DIAGRAM

OSC

PLL

M

Feedback

Divider

N

Output

Divider

1

0

Q0

nQ0

Q1

nQ1

Q2

nQ2

Q3

nQ3

Q4

nQ4

Q5

nQ5

XTAL_IN

XTAL_OUT

PLL_BYPASS

FB_SEL

N_SEL1

Pullup

Pulldown

N_SEL0

24-Lead TSSOP, E-Pad

4.40mm x 7.8mm x 0.92mm

body package

G Package

Top View

SELECT FUNCTION TABLE

Inputs

Function

FB_SEL

N_SEL1

N_SEL0

M Divide

N Divide

M/N

00

025

1

25

0

1

25

2

12.5

0

1

0

25

4

6.25

01

125

5

10

032

1

32

10

132

2

16

11

032

4

8

11

132

8

4

PIN ASSIGNMENT

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