ICS8308I 데이터 시트보기 (PDF) - Integrated Device Technology

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ICS8308I

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

Integrated Device Technology 

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

Perfor mance Clock Solutions from IDT. 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 trans-

mission 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.

ICS8308I

FEATURES

• Eight 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 (RoHS 5) and lead-free (RoHS 6)

packages

BLOCK DIAGRAM

CLK_EN Pullup

LVCMOS_CLK Pullup

1

CLK Pullup

nCLK Pulldown

0

CLK_SEL Pullup

D

Q

LE

OE Pullup

IDT™ / ICS™ LVCMOS FANOUT BUFFER

PIN ASSIGNMENT

Q0 1

GND 2

24 VDDO

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, 173-MIL TSSOP

Q6

4.4mm x 7.8mm x 0.925mm body package

G Package

Q7

Top View

1

ICS8308AGI REV. B OCTOBER 16, 2007

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