8725

www.icst.com/products/hiperclocks.html

REV. A MARCH 5, 2001

1

Integrated

Circuit

Systems, Inc.

ICS8725

PRELIMINARY

The ICS8725 is a high performance LVHSTL

zero delay buffer and a member of the

HiPerClockS™ family of High Performance

Clocks Solutions from ICS. The VCO operates

at a frequency range of 250MHz to 500MHz.

Utilizing one of the outputs as feedback to the PLL output

frequencies up to 500MHz can be regenerated with zero

delay with respect to the input. Dual reference clock inputs

support redundant clock or multiple reference applications.

• Fully integrated PLL

• 5 LVHSTL outputs each with the ability to drive 50Ω to

ground

• Voh (max) = 1.2V

• 31.25MHz to 500MHz output frequency range

• Spread Smart™ for regenerating spread spectrum clocks

• Differential reference clock inputs accept any differential

input signal

•· Differential reference clock inputs will accept single ended

input signal with one of the inputs biased with a resistor

network

• 31.25MHz to 622MHz input frequency range

• LVCMOS / LVTTL control inputs

• 3.3V core, 1.8V output operating supply voltage

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

package body, 0.8mm package lead pitch

• 0°C to 70°C ambient operating temperature

• Industrial temperature version available upon request

HiPerClockS™

,&6

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.

Q0

nQ0

Q1

nQ1

Q2

nQ2

Q3

nQ3

Q4

nQ4

DIV_SEL0

DIV_SEL1

REF_CLK1

nREF_CLK1

REF_CLK2

nREF_CLK2

REF_SEL

REF_DIV

FB_IN

nFB_IN

PLL_SEL

MR

0

1

PLL

÷1

÷2

÷4

÷8

0

1

÷8

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

VDDO

Q3

nQ3

Q2

nQ2

Q1

nQ1

VDDO

DIV_SEL0

DIV_SEL1

REF_CLK1

nREF_CLK1

REF_CLK2

nREF_CLK2

REF_SEL

MR

32-Lead LQFP

Y Package

Top View

ICS8725