ICS840008AR-01 Просмотр технического описания (PDF) - Integrated Circuit Systems

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ICS840008AR-01

FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY SYNTHESIZER

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

PRELIMINARY

ICS840008-01

FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL

FREQUENCY SYNTHESIZER

GENERAL DESCRIPTION

The ICS840008-01 is an 8 output LVCMOS/LVTTL

ICS

Synthesizer designed to generate 125MHz for

HiPerClockS™ Gigabit Ethernet applications and is a member of

the HiPerClocksTM family of high performance clock

solutions from ICS. The ICS840008-01 uses ICS’

3rd generation low phase noise VCO technology and can achieve

1ps or lower typical random rms phase jitter, easily meeting

Gigabit Ethernet jitter requirements. The ICS840008-01 is

packaged in a small 24-pin SSOP package.

FEATURES

• Eight LVCMOS/LVTTL outputs, 15Ω typical output impedance

• Output frequency range: 125MHz - 160MHz

• Crystal oscillator interface, 25MHz - 32MHz crystal

• VCO range: 500MHz - 640MHz

• RMS phase jitter (1.875MHz - 20MHz): 0.52ps (typical)

• Output skew: 150ps (maximum) (design target)

• Voltages supply modes:

Core/Output

3.3V/3.3V

3.3V/2.5V

3.3V/1.8V

2.5V/2.5V

2.5V/1.8V

• 0°C to 70°C ambient operating temperature

• Industrial temperature information available upon request

BLOCK DIAGRAM

nPLL_SEL Pulldown

XTAL_IN

XTAL_OUT

25MHz

OSC

Phase

Detector

1

VCO

500MHz - 0

640MHz

MR Pulldown

OE Pullup

÷20 (fixed)

PIN ASSIGNMENT

÷4 (fixed)

8

8

Q0:Q7

VDDO 1

nc 2

XTAL_OUT 3

XTAL_IN 4

VDDA 5

OE 6

MR 7

nPLL_SEL 8

VDD 9

nc 10

GND 11

nc 12

24 Q0

23 Q1

22 GND

21 Q2

20 Q3

1 9 VDDO

18 Q4

17 Q5

16 GND

15 Q6

14 Q7

1 3 VDDO

ICS840008-01

24-Lead SSOP, 150MIL

3.9mm x 8.65mm x 1.5mm

package body

R Package

Top View

The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial

product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.

840008AR-01

www.icst.com/products/hiperclocks.html

REV. A APRIL 7, 2005

1

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