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PDF ICS309 Data sheet ( Hoja de datos )
| Número de pieza | ICS309 | |
| Descripción | SERIAL PROGRAMMABLE TRIPLE PLL SS VERSACLOCK SYNTHESIZER | |
| Fabricantes | Integrated Circuit Systems | |
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ICS309
SERIAL PROGRAMMABLE TRIPLE PLL SS VERSACLOCK SYNTHESIZER
Description
The ICS309 is a versatile serially-programmable, triple
PLL with spread spectrum clock source. The ICS309
can generate any frequency from 250kHz to 200 MHz,
and up to 6 different output frequencies simultaneously.
The outputs can be reprogrammed on-the-fly, and will
lock to a new frequency in 10 ms or less.
To reduce system EMI emissions, spread spectrum is
available that supports modulation frequencies of
31 kHz and 120 kHz, as well as modulation amplitudes
of +/-0.25% to +/-2.0%. Both center and down-spread
options are available.
The device includes a PDTS pin which tri-states the
output clocks and powers down the entire chip.
The ICS309 default for non-programmed start-up are
buffered reference clock outputs on all clock output
pins.
ICS’ VersaClockTM programming software allows the
user to configure up to 9 outputs with target
frequencies, spread spectrum capabilities or buffered
reference clock outputs. The VersaClockTM software
automatically configures the PLLs for optimal overall
performance.
Block Diagram
Features
• Packaged in 20-pin SSOP (QSOP)
• Highly accurate frequency generation
• M/N Multiplier PLL: M = 1..2048, N = 1..1024
• Serially programmable: user determines the output
frequency via a 3-wire interface
• Spread Spectrum frequency modulation for reduced
system EMI
• Center or Down Spread up to 4% total
• Selectable 32 kHz and 120 kHz modulation
• Eliminates need for custom quartz oscillators
• Input crystal frequency of 5 - 27 MHz
• Input clock frequency of 3 - 50 MHz
• Output clock frequencies up to 200 MHz
• Operating voltage of 3.3 V
• Up to 9 reference clock outputs
• Power down tri-state mode
• Very low jitter
STROBE
SCLK
DATA
Crystal or
clock input
X1/ICLK
X2
Crystal
O s c illa to r
External capacitors are
required with a crystal input.
VDD 3
PLL1 with
Spread
S p e c tru m
PLL2
PLL3
Divide
Logic
and
Output
Enable
Control
GND 2
PDTS
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
CLK9
MDS 309 G
1
Revision 122704
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
1 page  
ICS309
SERIAL PROGRAMMABLE TRIPLE PLL SS VERSACLOCK SYNTHESIZER
Spread Spectrum Modulation
The ICS309 utilizes frequency modulation (FM) to
distribute energy over a range of frequencies. By
modulating the output clock frequencies, the device
effectively lowers energy across a broader range of
frequencies; thus, lowering a system’s
electro-magnetic interference (EMI). The modulation
rate is the time from transitioning from a minimum
frequency to a maximum frequency and then back to
the minimum.
Spread Spectrum Modulation can be applied as either
“center spread” or “down spread”. During center spread
modulation, the deviation from the target frequency is
equal in the positive and negative directions. The
effective average frequency is equal to the target
frequency. In applications where the clock is driving a
component with a maximum frequency rating, down
spread should be applied. In this case, the maximum
frequency, including modulation, is the target
frequency. The effective average frequency is less than
the target frequency.
The ICS309 operates in both center spread and down
spread modes. For center spread, the frequency can
be modulated between ±0.125% to ±2.0%. For down
spread, the frequency can be modulated between
-0.25% to -4.0%.
Both output frequency banks will utilize identical spread
spectrum percentage deviations and modulation rates,
if a common VCO frequency can be identified.
Spread Spectrum Modulation Rate
The spread spectrum modulation frequency applied to
the output clock frequency may occur at a variety of
rates. For applications requiring the driving of
“down-circuit” PLLs, Zero Delay Buffers, or those
adhering to PCI standards, the spread spectrum
modulation rate should be set to 30-33 kHz. For other
applications, a 120 kHz modulation option is available.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS309. These ratings, which
are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the
device at these or any other conditions above those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can
affect product reliability. Electrical parameters are guaranteed only over the recommended operating
temperature range.
Parameter
Condition
Min. Typ. Max. Units
Supply Voltage, VDD
Referenced to GND
7V
Inputs
Referenced to GND -0.5
VDD+ 0.5
V
Clock Outputs
Referenced to GND -0.5
VDD+ 0.5
V
Storage Temperature
-65 150 °C
Soldering Temperature
Max 10 seconds
260 °C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature
Ambient Operating Temperature (ICS309RI)
Power Supply Voltage (measured in respect to GND)
Power Supply Ramp Time
Min.
0
-40
+3.0
Typ.
Max.
+70
+85
+3.6
4
Units
°C
°C
V
ms
MDS 309 G
5
Revision 122704
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ICS309.PDF ] | |
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