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  ON Semiconductor Electronic Components Datasheet  

NB4N507A Datasheet

PECL Clock Synthesizer

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NB4N507A pdf
NB4N507A
3.3V/5V, 50 MHz to 200 MHz
PECL Clock Synthesizer
Description
The NB4N507A is a precision clock synthesizer which generates a
very low jitter differential PECL output clock. It produces a clock
output based on an integer multiple of an input reference frequency.
The NB4N507A accepts a standard fundamental mode crystal,
using Phase-Locked-Loop (PLL) techniques, will produce output
clocks up to 200 MHz. In addition, the PLL circuitry will produce a
50% duty cycle square-wave clock output (see Figure 7).
The NB4N507A can be programmed to generate a selection of input
reference frequency multiples. An exact 155.52 MHz output clock can
be generated from a 19.44 MHz crystal and the x8 multiplier selection.
The NB4N507A is intended for low output jitter clock generation.
The PECL outputs are 15 mA open collector and must be DC loaded
and AC terminated. See Figures 4 and 6.
Features
ăInput Crystal Frequency of 10 - 27 MHz
ăEnable Usage of Common Low-Cost Crystal
ăDifferential PECL Output Clock Frequencies up to 200 MHz
ăDuty Cycle of 48%/52%
ăOperating Range: VCC = 3.0 V to 5.5 V
ăIdeal for SONET Applications and Oscillator Manufacturers
ăAvailable in Die Form
ăPackaged in 16-Pin Narrow SOIC
ăPb-Free Packages are Available*
http://onsemi.com
SOIC-16
D SUFFIX
CASE 751B
MARKING DIAGRAM
NB4N507AG
AWLYWW
Osc PD
CP VCO
PECL
CLKOUT
CLKOUT
Mult OE
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
G = Pb-Free Package
S0 S1
Figure 1. Simplified Logic Block Diagram
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
*For additional information on our Pb-Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
©Ă Semiconductor Components Industries, LLC, 2007
September, 2007 - Rev. 3
1
Publication Order Number:
NB4N507A/D


  ON Semiconductor Electronic Components Datasheet  

NB4N507A Datasheet

PECL Clock Synthesizer

No Preview Available !

NB4N507A pdf
NB4N507A
VDD
X1/CLK
Crystal
X2
Oscillator
Buffer
Feedback
Phase
Detector
Charge
Pump
VCO
PECL
Output
Multiplier
Select
CLKOUT
CLKOUT
OE
GND
Figure 2. NB4N507A Logic Diagram
S0 S1
X1/CLK
VDD
VDD
S1
GND
GND
NC
CLKOUT
1
2
3
4
5
6
7
8
16 X2
15 NC
14 S0
13 OE
12 NC
11 NC
10 NC
9 CLKOUT
Figure 3. 16-Pin SOIC (Top View)
Table 1. CLOCK MULTIPLIER SELECT TABLE
S1 S0 Multiplier
L L 9.72X*
L M 10X
L H 12X
M L 6.25X
M M 8X
M H 5X
H L NA
H M 3X
H H 4X
*Example Crystal = 16 MHz, fCLKOUT = 155.52 MHz
L = GND
H = VDD
M = OPEN
Table 2. OE, OUTPUT ENABLE FUNCTION
OE Function
0 Disable
1 Enable
http://onsemi.com
2


Part Number NB4N507A
Description PECL Clock Synthesizer
Maker ON Semiconductor
Total Page 8 Pages
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