NB4L6254 Datasheet, PDF (1/9 Pages) ON Semiconductor – 2.5V / 3.3V Differential LVPECL 2x2 Clock Switch and Low Skew Fanout Buffer

NB4L6254
2.5V / 3.3V Differential
LVPECL 2x2 Clock Switch
and Low Skew Fanout
Buffer
Description
The NB4L6254 is a differential 2x2 clock switch and drives
precisely aligned clock signals through its LVPECL fanout buffers. It
employs a fully differential architecture with bipolar technology,
offers superior digital signal characteristics, has very low clock output
skew and supports clock frequencies from DC up to 3.0 GHz.
The NB4L6254 is designed for the most demanding, skew critical
differential clock distribution systems. Typical applications for the
NB4L6254 are clock distribution, switching and data loopback
systems of high−performance computer, networking and
telecommunication systems, as well as on−board clocking of OC−3,
OC−12 and OC−48 communication systems. In addition, the
NB4L6254 can be configured as a single 1:6 or dual 1:3 LVPECL
fanout buffer.
The NB4L6254 can be operated from a single 3.3 V or 2.5 V power
supply.
Features
• Maximum Clock Input Frequency, 3 GHz
• Maximum Input Data Rate, 3 Gb/s
CLK0
• Differential LVPECL Inputs and Outputs
CLK0
• Low Output Skew: 50 ps Maximum Output−to−Output Skew
• Synchronous Output Enable Eliminating Output Runt Pulse
Generation and Metastability
• Operating Range: Single 3.3 V or 2.5 V Supply
CLK1
CLK1
V_CC = 2.375 V to 3.465 V
• LVCMOS Compatible Control Inputs
• Packaged in LQFP−32
SEL0
• Fully Differential Architecture
SEL1
• −40°C to 85°C Ambient Operating Temperature
OEA
• These are Pb−Free Devices*
OEB
http://onsemi.com
MARKING
DIAGRAM*
LQFP−32
FA SUFFIX
CASE 873A
NB4L
6254
AWLYYWWG
A
= Assembly Location
WL = Wafer Lot
YY
= Year
WW = Work Week
G
= Pb−Free Package
*For additional marking information, refer to
Application Note AND8002/D.
V_CC
Bank A
QA0
0
QA0
QA1
QA1
1
QA2
QA2
V_CC
Bank B
QB0
0
QB0
QB1
QB1
1
QB2
QB2
Figure 1. Functional Block Diagram
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
1
August, 2006 − Rev. 1
Publication Order Number:
NB4L6254/D