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ICS8308I

LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

ICS8308I

LOW SKEW, 1-TO-8

DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER

GENERAL DESCRIPTION

The ICS8308I is a low-skew, 1-to-8 Fanout Buffer

and a member of the HiPerClockS™ family of

High Performance Clock Solutions from ICS. The

ICS8308I has two selectable clock inputs. The

CLK, nCLK pair can accept most differential input

levels. The LVCMOS_CLK can accept LVCMOS or LVTTL

input levels. The low impedance LVCMOS/LVTTL outputs

are designed to drive 50Ω series or parallel terminated

transmission lines. The effective fanout can be increased

from 8 to 16 by utilizing the ability of the outputs to drive two

series terminated transmission lines.

The ICS8308I is characterized for 3.3V core/3.3V output,

3.3V core/2.5V output or 2.5V core/2.5V output operation.

Guaranteed output and part-part skew characteristics make

the 8308I ideal for those clock distribution applications requiring

well defined performance and repeatability.

FEATURES

• 8 LVCMOS/LVTTL outputs (7Ω typical output impedance)

• Selectable LVCMOS_CLK or differential CLK, nCLK

inputs

• CLK, nCLK pair can accept the following differential

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

• Maximum Output Frequency: 350MHz

• Output Skew: (3.3V± 5%): 100ps (maximum)

• Part to Part Skew: (3.3V± 5%): 1ns (maximum)

• Supply Voltage Modes:

(Core/Output)

3.3V/3.3V

3.3V/2.5V

2.5V/2.5V

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

• Available in both, Standard and RoHS/Lead-Free

compliant packages

BLOCK DIAGRAM

CLK_EN Pullup

LVCMOS_CLK Pullup

1

CLK Pullup

nCLK Pulldown

0

CLK_SEL Pullup

D

Q

LE

OE Pullup

PIN ASSIGNMENT

Q0 1

24 VDDO

GND 2

23 Q2

CLK_SEL 3

22 GND

LVCMOS_CLK 4

21 Q3

Q0

CLK 5

20 VDDO

nCLK 6

19 Q4

Q1

CLK_EN 7

18 GND

OE 8

17 Q5

Q2

VDD 9

16 VDDO

GND 10 15 Q6

Q3

Q1 11 14 GND

VDDO 12 13 Q7

Q4

ICS8308I

Q5

24-Lead, 300-MIL TSSOP

Q6

4.4mm x 7.8mm x 0.92mm body package

G Package

Q7

Top View

8308AGI

www.icst.com/products/hiperclocks.html

1

REV. B JULY 25, 2005

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