1©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, V
EE
= 0V
• ECL mode operating voltage supply range:
V
CC
= 0V, V
EE
= -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
V
EE
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