83940AY-02

www.icst.com/products/hiperclocks.html

REV. A AUGUST 6, 2001

1

Integrated

Circuit

Systems, Inc.

ICS83940-02

PRELIMINARY

The ICS83940-02 is a low skew, 1-to-18 Fanout

Buffer and a member of the HiPerClockS™

family of High Performance Clock Solutions from

ICS. The low impedance LVCMOS out-

puts are designed to drive 50

Ω series or parallel

terminated transmission lines. The effective fanout can be in-

creased from 18 to 36 by utilizing the ability of the outputs to

drive two series terminated lines. The differential clock

input is designed to accept any differential input levels

including LVPECL.

The ICS83940-02 is characterized at full 3.3V, full 2.5V and

mixed 3.3V input and 2.5V output operating supply modes.

Guaranteed output and part-to-part skew characteristics

make the ICS83940 ideal for those clock distribution applica-

tions demanding well defined performance and repeatability.

• 18 LVCMOS outputs, 7Ω typical output impedance

• Output frequency up to 200MHz

• 150ps output skew

• Part to part skew: TBD

• Selectable LVCMOS or differential clock input

• LVTTL / LVCMOS clock select input

• Full 3.3V, 2.5V or mixed 3.3V, 2.5V supply modes

• 0°C to 70°C ambient operating temperature

• Industrial temperature information available upon request

HiPerClockS™

,&6

32-Lead LQFP

Y Pacakge

7mm x 7mm x 1.4mm package body

Top View

Q0

Q1 - Q16

Q17

CLK_SEL

CLK0

nCLK0

LVCMOS_CLK

0

1

32 31 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

Q6

Q7

Q8

VDDO

Q9

Q10

Q11

GND

GND

GND

LVCMOS_CLK

CLK_SEL

CLK

nCLK

VDDI

VDDO

ICS83940-02

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.