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ON Semiconductor - 3.3V Programmable 3-PLL Clock Synthesizer

Numéro de référence NB3N65027
Description 3.3V Programmable 3-PLL Clock Synthesizer
Fabricant ON Semiconductor 
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NB3N65027 fiche technique
NB3N65027
3.3V Programmable 3-PLL Clock
Synthesizer with
6 LVTTL/LVCMOS Outputs w/OE
The NB3N65027 is a LVCMOS PLLsynthesized clock generator.
It accepts a 10 MHz to 27 MHz clock or fundamental mode crystal as
the reference source and drives three independent, low noise
phaselocked loops (PLLs).
Control lines ACSx, BCSx and CCS will select their appropriate
bank output frequencies. ACS1 and BCS1 are twolevel
LVTTL/LVCMOS inputs, High and Low. ACS0, BCS0 and CCS are
threelevel LVCMOS inputs, High, Mid and Low.
The NB3N65027 has three independent LVTTL/LVCMOS output
banks of two outputs each. Banks A and B offer a 1X and a 1/2X
output. Using a 25 MHz crystal, the selectable output frequencies
range from 16 2/3 MHz to 133 1/3 MHz. A 12.5 MHz crystal offers
from 8 1/3 MHz to 66 2/3 MHz. In addition, the NB3N65027 will
generate a buffered reference LVTTL/LVCMOS output, REFOUT,
10 MHz to 27 MHz. See Tables 2 through 9 for the variety of available
output frequencies. The OE pin, when set LOW, will disable the output
drivers to high impedance.
The NB3N65027 operates from a single +3.3 V supply across the
operating temperature range from 40°C to +85°C, and is offered in a
QSOP20 RoHS compliant package.
The NB3N65027 provides the optimum combination of low cost,
flexibility, and high performance for Network, PCI and SDRAM
applications.
Features
http://onsemi.com
MARKING DIAGRAM
3N65027
AWLYWWG
QSOP20
CASE 492AC
3N65027 = Specific Device Code
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
G = PbFree Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
12.5 MHz or 25 MHz Fundamental Crystal or Clock
Input
Six Output Clocks with Selectable Frequencies
Buffered Crystal Reference Output
SDRAM Frequencies of 67, 83, 100, and 133 MHz
Operating Range: VCC = 3.3 V ±10%
QSOP20 Package, 150 mil
40°C to +85°C Ambient Operating Temperature
These Devices are PbFree and are RoHS Compliant
LVCMOS with 25 mA Output Drive Capability at TTL
Levels
VDD
ACS1
ACS0
BCS1
BCS0
CCS
25 or 12.5 MHz
crystal or clock
X1/ICLK
X2 CLX2
PLLA
PLLB
PLLC
Buffer /
Oscillator
Clock
Synthesis
and Control
Circuitry
CLX1
GND
Figure 1. Simplified Logic Diagram
CLKA1
B2 CLKA2
CLKB1
B2 CLKB2
CLKC1
CLKC2
REFOUT
OE (all outputs)
© Semiconductor Components Industries, LLC, 2011
June, 2011 Rev. 2
1
Publication Order Number:
NB3N65027/D

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