8344

www.icst.com

REV. B FEBRUARY 2, 2001

1

PRELIMINARY

Integrated

Circuit

Systems, Inc.

ICS8344

The ICS8344 is a low voltage, low skew fanout

buffer and a member of the HiPerClockS™

family of High Performance Clock Solutions from

ICS. The ICS8344 is designed to translate any

differential signal levels to LVCMOS levels. The

low impedance LVCMOS outputs are designed to drive 50

Ω

series or parallel terminated transmission lines. The effective

fanout can be increased to 48 by utilizing the ability of the

outputs to drive two series terminated lines. Redundant clock

applications can make use of the dual clock input. The dual

clock inputs also facilitate board level testing. ICS8344 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 ICS8344 ideal for those clock distribution applica-

tions demanding well defined performance and repeatability.

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.

• 24 LVCMOS outputs, 7Ω typical output impedance

• Output frequency up to 167MHz

• 275ps output skew, 600ps part to part skew

• Translates any differential input signal (PECL, HSTL, LVDS)

to LVCMOS without external bias networks

• Translates any single-ended input signal to LVCMOS with

resistor bias on nCLK input

• Translates and inverts any single-ended input signal to

LVCMOS with resistor bias on CLK input

• Multiple differential clock input pairs for redundant clock

applications

• LVCMOS control inputs

• Multiple output enable pins for disabling unused outputs in

reduced fanout applications

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

• 48 lead low-profile QFP(LQFP), 7mm x 7mm x 1.4mm

package body, 0.5mm package lead pitch

• 0°C to 70°C ambient operating temperature

• Industrial temperature versions available upon request

48 47 46 45 44 43 42 41 40 39 38 37

13 14 15 16 17 18 19 20 21 22 23 24

1

2

3

4

5

6

7

8

9

10

11

12

36

35

34

33

32

31

30

29

28

27

26

25

Q16

Q17

VDDO

GND

Q18

Q19

Q20

Q21

VDDO

GND

Q22

Q23

Q7

Q6

VDDO

GND

Q5

Q4

Q3

Q2

VDDO

GND

Q1

Q0

0

1

0

1

CLK0

nCLK0

OE1

OE2

OE3

Q0 - Q7

O8 - Q15

O16 - Q23

CLK_SEL

CLK1

nCLK1

48-Lead LQFP

Y Package

Top View

ICS8344

HiPerClockS™

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