NB4N441 Datasheet, PDF (1/12 Pages) ON Semiconductor – 3.3V Serial Input MultiProtocol PLL Clock Synthesizer, Differential LVPECL Output

NB4N441
3.3V Serial Input
MultiProtocol PLL Clock
Synthesizer, Differential
LVPECL Output
Description
The NB4N441 is a precision clock synthesizer which generates a
differential LVPECL clock output frequency from 12.5 MHz to
425 MHz. A Serial Peripheral Interface (SPI) is used to configure the
device to produce one of sixteen popular standard protocol output
frequencies from a single 27 MHz crystal reference. The NB4N441
also has the added feature of allowing application specific output
frequencies from 12.5 MHz to 425 MHz using crystals within the
range of 10 MHz to 28 MHz.
Features
• Performs Precision Clock Generation and Synthesis from a Single
27 MHz Crystal Reference
• Serial Load Capability for Proprietary Frequencies
• Flexible Input Allows for External Clock Reference
• Exceeds Bellcore and ITU Jitter Generation Specification
• PLL Lock Detect Output
• Output Enable
• Fully Integrated Phase−Lock−Loop with Internal Loop Filter
• Operating Range: V_CC = 3.135 V to 3.465 V
• Small Footprint 24 Pin QFN
• These are Pb−Free Devices*
LOCKED
27 MHz
XTAL
OSC
B
R
FB
Feedback
Divider
SDATA
SCLOCK
SLOAD
Frequency Control Logic
Serial Load
http://onsemi.com
QFN−24
MN SUFFIX
CASE 485L
MARKING
DIAGRAM*
24
1
NB4N
441
ALYWG
G
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
*For additional marking information, refer to
Application Note AND8002/D.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
OUTDIV
B2, 4, 8,
16, 32
CLKOUT
CLKOUT
OE
V_CC − 2 V
Figure 1. Simplified 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.
© Semiconductor Components Industries, LLC, 2006
1
June, 2006 − Rev. 0
Publication Order Number:
NB4N441/D