ICS844071 datasheet(1/15 Pages) IDT

Part #	ICS844071

Description	FEMTOCLOCKS??CRYSTAL-TO-LVDS CLOCK GENERATOR

PDF	15 Pages

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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FEMTOCLOCKS™ CRYSTAL-TO-LVDS

CLOCK GENERATOR

ICS844071

IDT™ / ICS™ LVDS CLOCK GENERATOR

1

ICS844071AG SEPTEMBER 26, 2007

General Description

The ICS844071 is a Serial ATA (SATA)/Serial

Attached SCSI (SAS) Clock Generator and a

member of the HiPerClocksTM family of high

performance devices from IDT. The ICS844071

uses an 18pF parallel resonant crystal over

the range of 20.833MHz - 28.3MHz. For SATA/SAS applications, a

25MHz crystal is used and either 75MHz or 150MHz may be

selected with the FREQ_SEL pin. The ICS844071 has excellent

<1ps phase jitter performance, over the 900kHz - 7.5MHz

integration range. The ICS844071 is packaged in a small 8-pin

TSSOP, making it ideal for use in systems with limited board

space.

Features

• One differential LVDS output

• Crystal oscillator interface, 18pF parallel resonant crystal

(20.833MHz – 28.3MHz)

• Output frequency range: 62.5MHz – 170MHz

• VCO range: 500MHz – 680MHz

• RMS phase jitter at 150MHz, using a 25MHz crystal

(900kHz – 7.5MHz): 0.45ps (typical)

• Full 3.3V or 2.5V operating supply

• 0°C to 70°C ambient operating temperature

• Available in both standard (RoHS 5) and lead-free (RoHS 6)

packages

Table 1. Common Configuration Table

Block Diagram

HiPerClockS™

ICS

Inputs

Output Frequency

(MHz)

Crystal Frequency (MHz)

FREQ_SEL

M

N

Multiplication Value M/N

25

0

24

4

6

150

25

1

24

8

3

75

26.041666

0

24

4

6

156.25

26.041666

1

24

8

3

78.125

26.5625

0

24

4

6

159.375

26.5625

1

24

8

3

79.675

OSC

Phase

Detector

VCO

500MHz - 680MHz

M = ÷24 (fixed)

FREQ_SEL

N

0

÷4

1

÷8

Q

nQ

FREQ_SEL

XTAL_IN

XTAL_OUT

Pullup

(Default)

1

2

3

4

8

7

6

5

VDD

GND

XTAL_OUT

XTAL_IN

VDD

Q

nQ

FREQ_SEL

Pin Assignment

ICS844071

8 Lead TSSOP

4.40mm x 3.0mm x 0.925mm

package body

G Package

Top View

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