Integrated

Circuit

Systems, Inc.

ICS8521I

8521BYI

www.icst.com/products/hiperclocks.html

REV. A NOVEMBER 17, 2005

1

PRELIMINARY

The ICS8521I is a low skew, 1-to-9 Differential-

to-HSTL Fanout Buffer and a member of the

HiPerClockS™family of High Performance Clock

Solutions from ICS. The ICS8521I has two se-

lectable clock inputs. The CLK, nCLK pair can

accept most standard differential input levels. The PCLK,

nPCLK pair can accept LVPECL, CML, or SSTL input levels.

The clock enable is internally synchronized to eliminate runt

pulses on the outputs during asynchronous asser tion/

deassertion of the clock enable pin.

Guaranteed output skew, part-to-part skew and crossover

voltage characteristics make the ICS8521I ideal for today’s

most advanced applications, such as IA64 and static RAMs.

HiPerClockS™

ICS

• Nine HSTL outputs

• Selectable differential CLK, nCLK or LVPECL clock inputs

• CLK, nCLK pair can accept the following differential

input levels: LVPECL, LVDS, HSTL, SSTL, HCSL

• PCLK, nPCLK supports the following input types:

LVPECL, CML, SSTL

• Maximum output frequency: 500MHz

• Output skew: 25ps (typical)

• Part-to-part skew: 200ps (typical)

• Propagation delay: 1.3ns (typical)

• V

• 3.3V core, 1.8V output operating supply voltages

• -40°C to 85°C ambient operating temperature

• Available in both standard and lead-free RoHS

compliant packages

32 3 1 30 29 28 27 26 25

9 10 11 12 13 14 15 16

1

2

3

4

5

6

7

8

24

23

22

21

20

19

18

17

Q3

nQ3

Q4

nQ4

Q5

nQ5

ICS8521I

CLK

nCLK

CLK_SEL

PCLK

nPCLK

GND

CLK_EN

32-Lead LQFP

7mm x 7mm x 1.4mm package body

Y Package

Top View

CLK

nCLK

PCLK

nPCLK

Q0

nQ0

Q1

nQ1

Q2

nQ2

Q3

nQ3

Q4

nQ4

Q5

nQ5

Q6

nQ6

Q7

nQ7

Q8

nQ8

D

Q

LE

CLK_EN

CLK_SEL

0

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.