Product Overview

Product Overview
NB3L208K: 2.5V, 3.3V Differential 1:8 HCSL Fanout Buffer
For complete documentation, see the data sheet
Product Description
The NB3L208K is a differential 1:8 Clock fanout buffer with
High-speed Current Steering Logic (HCSL) outputs. Inputs can
directly accept differential LVPECL, LVDS, and HCSL signals.
Single-ended LVPECL, HCSL, LVCMOS, or LVTTL levels are
accepted with a proper external Vth reference supply per Figures 4
and 6. The input signal will be translated to HCSL and provides eight
identical copies operating up to 350 MHz.
The NB3L208K is optimized for ultra-low phase noise, propagation
delay variation and low output–to–output skew, and is DB800H
compliant. As such, system designers can take advantage of the
NB3L208K’s performance to distribute low skew clocks across the
backplane or the motherboard making it ideal for Clock and Data
distribution applications such as PCI Express, FBDIMM, Networking,
Mobile Computing, Gigabit Ethernet, etc.
Output drive current is set by connecting a 475 resistor from
IREF (Pin 27) to GND per Figure 11. Outputs can also interface to
LVDS receivers when terminated per Figure 12.
Features
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Maximum Input Clock Frequency > 350 MHz
2.5 V ±5% / 3.3 V ±10% Supply Voltage Operation
8 HCSL Outputs
DB800H Compliant
Individual OE Control Pin for Each Bank of 2 Outputs
200 ps Max Output-to-Output Skew Performance
1 ns Typical Propagation Delay
450 ps Typical Rise and Fall Times
80 fs Maximum Additive Phase Jitter RMS
Applications
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Mobile Computing
Networking
Gigabit Ethernet
FBDIMM
PCI Express
Part Electrical Specifications
Product
Compliance
Status
Type
Chann
els
Input / Input
Output Level
Ratio
Output VCC
Level
Typ
(V)
tJitterR
MS
Typ
(ps)
tskew(oo) Max
(ps)
tpd Typ
(ns)
tR & tF
Max
(ps)
fmaxClo fmaxDat Packa
ck Typ a Typ ge
(MHz) (Mbps) Type
NB3L208KMNG
Pb-free
Active
Buffer
1
1:8
HCSL
0.046
20
1
700
350
QFN32
0.046
20
1
700
350
QFN32
Halide free
HCS
L
2.5
3.3
LVP
ECL
LVD
S
NB3L208KMNTXG
Pb-free
Halide free
Active
Buffer
1
1:8
LVD
S
HCSL
2.5
3.3
HCS
L
LVP
ECL
For more information please contact your local sales support at www.onsemi.com
Created on: 6/30/2016