84025EM

www.icst.com/products/hiperclocks.html

REV. A APRIL 16, 2003

1

Integrated

Circuit

Systems, Inc.

ICS84025

PRELIMINARY

The ICS84025 is a Crystal-to-LVCMOS/LVTTL

Frequency Synthesizer with Fanout Buffer and

a member of the HiPerClockS™ family of High

Performance Clock Solutions from ICS. The

VCO frequency is programmed in steps equal

to the value of the crystal frequency. The VCO and

output frequency can be programmed using the feedback and

output frequency select pins. The low phase noise character-

istics of the ICS84025 make it an ideal clock source for Fibre

Channel 1 and Gigabit Ethernet applications.

• 6 LVCMOS/LVTTL outputs

• Crystal oscillator interface

• Output frequency range: 53.125MHz to 125MHz

• Crystal input frequency: 25MHz and 25.5MHz

• RMS phase jitter at 106.25, using a 25.5MHz crystal

(637KHz to 10MHz): 3.25ps

• Phase noise:

Offset

Noise Power

100Hz ................. -100 dBc/Hz

1KHz ................. -115 dBc/Hz

10KHz ................. -125 dBc/Hz

100KHz ................. -127 dBc/Hz

• 3.3V core, outputs may either be 3.3V, 2.5V or 1.8V

• 0°C to 70°C ambient operating temperature

• Industrial temperature information available upon request

HiPerClockS™

,&6

Q0:Q5

PLL

Feedback

Divider

OSC

Output

Divider

0

1

XTAL1

XTAL2

F_SEL1

PLL_SEL

MR

F_SEL0

ICS84025

24-Lead, 300-MIL SOIC

7.5mm x 15.33mm x 2.3mm body package

M Package

Top View

Q0

GND

Q1

Q2

GND

Q3

Q4

GND

Q5

1

2

3

4

5

6

7

8

9

10

11

12

F_SEL0

F_SEL1

MR

XTAL1

XTAL2

GND

PLL_SEL

GND

nc

24

23

22

21

20

19

18

17

16

15

14

13

s

t

u

p

n

IL

A

T

Xy

c

n

e

u

q

e

r

F

t

u

p

t

u

O

R

M1

L

E

S

_

F0

L

E

S

_

FT

U

O

_

F

1X

X

W

O

L

00

0

z

H

M

5

.

5

2z

H

M

5

2

1

.

3

5

00

1

z

H

M

5

.

5

2z

H

M

5

2

.

6

0

1

01

0

z

H

M

5

2z

H

M

5

.

2

6

01

1

z

H

M

5

2z

H

M

5

2

1

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.