DATA SHEET

ICS810251AGI REVISION B OCTOBER 5, 2012

1

©2012 Integrated Device Technology, Inc.

VCXO and Synchronous Ethernet

Jitter Attenuator

ICS810251I

General Description

The ICS810251I is a high performance, low jitter/low phase noise

VCXO. The ICS810251i uses a low frequency and low cost pullable

crystal to achieve jitter attenuation for synchronous Ethernet

applications. The ICS810251I can take an input of either 25MHz or

125MHz and produce a single LVCMOS output of 25MHz.

The device is packaged in a small 16 lead TSSOP package and is

ideal for use on space constrained boards typically encountered in

most synchronous ethernet applications.

Applications

Features

output Impedance: 15



external crystal (XTAL)

ICS810251I

16-Lead TSSOP

4.4mm x 5.0mm x 0.925mm

package body

G Package

Top View

Pin Assignment

Block Diagram

VCXO-PLL

LF0

LF1

(External loop

filter inputs.)

Pre-

divider

PFD

CP

VCXO

25MHz

25MHz

CLK_IN

Q

(25MHz or 125MHz

input frequency auto

detect)

(÷1 or ÷5)

OE

1

0

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

OE

Q

Reserved

GND

PLL_SEL

CLK_IN

LF1

LF0

GND

XTAL_IN

XTAL_OUT

GND