83940DYI-01

www.icst.com/products/hiperclocks.html

REV. A MARCH 1, 2004

1

Integrated

Circuit

Systems, Inc.

ICS83940I-01

PRELIMINARY

The ICS83940I-01 is a low skew, 1-to-18

LVPECL-to-LVCMOS/LVTTL Fanout Buffer and a

member of the HiPerClockS™family of High Per-

for mance Clock Solutions from ICS. The

ICS83940I-01 has two selectable clock inputs.

The PCLK, nPCLK pair can accept LVPECL, CML or SSTL

input levels. The single ended clock input accepts LVCMOS

or LVTTL input levels. The low impedance LVCMOS/LVTTL

outputs are designed to drive 50

Ω series or parallel termi-

nated transmission lines. The effective fanout can be increased

from 18 to 36 by utilizing the ability of the outputs to drive two

series terminated lines.

The ICS83940I-01 is characterized at full 3.3V, full 2.5V and

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

anteed output and part-to-part skew characteristics make the

ICS83940I-01 ideal for those clock distribution applications de-

manding well defined performance and repeatability.

HiPerClockS™

ICS

32-Lead LQFP

Y Pacakge

7mm x 7mm x 1.4mm package body

Top View

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

Q9

Q10

Q11

GND

GND

GND

LVCMOS_CLK

CLK_SEL

PCLK

nPCLK

ICS83940I-01

• 18 LVCMOS/LVTTL outputs, 23Ω typical output impedance

• Selectable LVCMOS_CLK or LVPECL clock inputs

• LVCMOS_CLK supports the following input types:

LVCMOS or LVTTL

• PCLK, nPCLK supports the following input types:

LVPECL, CML, SSTL

• Maximum output frequency: 250MHz

• Output skew: 150ps (maximum)

• Part-to-part skew: 750ps (maximum)

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

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

• Pin compatible with the MPC940L in single supply

applications

Q0:Q17

CLK_SEL

PCLK

nPCLK

LVCMOS_CLK

0

1

18

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.