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©2016 Integrated Device Technology, Inc.

Revision B, February 18, 2016

General Description

The 85311I is a low skew, high performance 1-to-2

Differential-to-2.5V/3.3V ECL/LVPECL Fanout Buffer. The CLK,

nCLK pair can accept most standard differential input levels.The

85311I is characterized to operate from either a 2.5V or a 3.3V

power supply. Guaranteed output and part-to-part skew

characteristics make the 85311I ideal for those clock distribution

applications demanding well defined performance and repeatability.

Features

• Two differential 2.5V/3.3V LVPECL / ECL outputs

• One CLK, nCLK input pair

• CLK, nCLK pair can accept the following differential input levels:

LVDS, LVPECL, LVHSTL, SSTL, HCSL

• Maximum output frequency: 1GHz

• Translates any single ended input signal to 3.3V LVPECL levels

with resistor bias on nCLK input

• Output skew: 20ps (maximum)

• Part-to-part skew: 350ps (maximum)

• Propagation delay: 2.1ns (maximum)

• Additive phase jitter, RMS: 0.14ps (typical), 3.3V

• LVPECL mode operating voltage supply range: 

V

CC = 2.375V to 3.465V, VEE = 0V

• ECL mode operating voltage supply range:

V

CC = 0V, VEE = -2.375V to -3.465V

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

• Available in lead-free (RoHS 6) package

Q0

nQ0

Q1

nQ1

CLK

nCLK Pullup

Pulldown

1

2

3

4

8

7

6

5

VCC

CLK

nCLK

VEE

Q0

Q1

nQ1

nQ0

85311I

8-Lead SOIC

3.90mm x 4.903mm x 1.37mm package body

M Package

Top View

Pin Assignment

Block Diagram

Low Skew, 1-to-2, Differential-to-2.5V, 3.3V

LVPECL/ ECL Fanout Buffer

85311I

Datasheet