© Semiconductor Components Industries, LLC, 2016
April, 2016 − Rev. 0
1 Publication Order Number:
NB3L204K/D
NB3L204K
2.5V, 3.3V Differential 1:4
HCSL Fanout Buffer
Description
The NB3L204K is a differential 1:4 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 four
identical copies operating up to 350 MHz.
The NB3L204K is optimized for ultra−low phase noise, propagation
delay variation and low output–to–output skew, and is DB400H
compliant. As such, system designers can take advantage of the
NB3L204K’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 W resistor from
IREF (Pin 14) to GND per Figure 11. Outputs can also interface to
LVDS receivers when terminated per Figure 12.
Features
• Maximum Input Clock Frequency > 350 MHz
• 2.5 V ±5% / 3.3 V ±10% Supply Voltage Operation
• 4 HCSL Outputs
• DB400H Compliant
• Individual OE Control Pin for Each Output
• 100 ps Max Output−to−Output Skew Performance
• 1 ns Typical Propagation Delay
• 500 ps Typical Rise and Fall Times
• 80 fs Maximum Additive RMS Phase Jitter
• −40°C to +85°C Ambient Operating Temperature
• QFN 24−pin Package, 4 mm x 4 mm
• These Devices are Pb−Free and are RoHS Compliant
Typical Applications
• PCI Express
• FBDIMM
• Mobile Computing
• Networking
• Gigabit Ethernet
MARKING
DIAGRAM
www.
onsemi.com
See detailed ordering and shipping information page 13 of this
data sheet.
ORDERING INFORMATION
NB3L204K = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
QFN24
4x4
CASE 485DJ
NB3L
204K
ALYWG
G
1
