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PDF ICS308 Data sheet ( Hoja de datos )
| Número de pieza | ICS308 | |
| Descripción | SERIAL PROGRAMMABLE QUAD PLL VERSACLOCK SYNTHESIZER | |
| Fabricantes | Integrated Circuit Systems | |
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ICS308
SERIAL PROGRAMMABLE QUAD PLL VERSACLOCK SYNTHESIZER
Description
The ICS308 is a versatile serially programmable, quad
PLL clock source. The ICS308 can generate any
frequency from 250 kHz 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. Smooth transitions
(in which the clock duty cycle remains roughly 50%) are
guaranteed if the output divider is not changed.
The device includes a PDTS pin which tri-states the
output clocks and powers down the entire chip.
The ICS308 default for non-programmed start-up are
buffered reference clock outputs on all clock output
pins.
Features
• Packaged in 20-pin SSOP (QSOP)
• Operating voltage of 3.3 V
• 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
• Eliminates need for custom quartz oscillators
• Input crystal frequency of 5 - 27 MHz
• Optional programmable on-chip crystal capacitors
• Output clock frequencies up to 200 MHz
• Reference clock output
• Power down tri-state mode
• Very low jitter
Block Diagram
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
PLL2
PLL3
PLL4
Divide
Logic
and
Output
Enable
Control
GND 2
PDTS
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
CLK9
MDS 308 F
1
Revision 090704
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
1 page  
ICS308
SERIAL PROGRAMMABLE QUAD PLL VERSACLOCK SYNTHESIZER
ICS VersaClock Software
ICS applies years of PLL optimization experience into a
user friendly software that accepts the user’s target
reference clock and output frequencies and generates
the lowest jitter, lowest power configuration, with only a
press of a button. The user does not need to have prior
PLL experience or determine the optimal VCO
frequency to support multiple output frequencies.
VersaClock software quickly evaluates accessible VCO
frequencies with available output divide values and
provides an easy to understand, bar code rating for the
target output frequencies. The user may evaluate
output accuracy, performance trade-off scenarios in
seconds.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS308. 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
Supply Voltage, VDD
Inputs
Clock Outputs
Storage Temperature
Soldering Temperature
Item
Referenced to GND
Referenced to GND
Referenced to GND
Max 10 seconds
Recommended Operation Conditions
Min.
-0.5
-0.5
-65
Typ.
Max.
7
VDD+ 0.5
VDD+ 0.5
150
260
Units
V
V
V
°C
°C
Parameter
Ambient Operating Temperature (ICS308R)
Ambient Operating Temperature (ICS308RI)
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 308 F
5
Revision 090704
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 ICS308.PDF ] | |
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