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PDF ICS290 Data sheet ( Hoja de datos )
| Número de pieza | ICS290 | |
| Descripción | Triple PLL Field Prog. Spread Spectrum Clock Synthesizer | |
| Fabricantes | Integrated Device Technology | |
| Logotipo |  |
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PRELIMINARY INFORMATION
ICS290www.DataSheet4U.com
Triple PLL Field Prog. Spread Spectrum Clock Synthesizer
Description
The ICS290 field programmable spread spectrum
clock synthesizer generates up to eight high-quality,
high-frequency clock outputs including multiple
reference clocks from a low-frequency crystal input. It
is designed to replace crystals, crystal oscillators and
stand alone spread spectrum devices in most
electronic systems.
Using ICS’ VersaClockTM software to configure PLLs
and outputs, the ICS290 contains a One-Time
Programmable (OTP) ROM for field programmability.
Programming features include input/output
frequencies, spread spectrum amount, eight selectable
configuration registers and up to two sets of four
low-skew outputs.
Using Phase-Locked Loop (PLL) techniques, the
device runs from a standard fundamental mode,
inexpensive crystal, or clock. It can replace multiple
crystals and oscillators, saving board space and cost.
The ICS290 is also available in factory programmed
custom versions for high-volume applications.
Features
• Packaged as 20-pin TSSOP
• Eight addressable registers
• Replaces multiple crystals and oscillators
• Output frequencies up to 200 MHz at 3.3 V
• Configurable Spread Spectrum Modulation
• Input crystal frequency of 5 to 27 MHz
• Clock input frequency of 3 to 166 MHz
• Up to eight reference outputs
• Up to two sets of four low-skew outputs
• Operating voltages of 3.3 V
• Controllable output drive levels
• Advanced, low-power CMOS process
• Available in Pb (lead) free packaging
Block Diagram
S2:S0 3
OTP
ROM
with PLL
Values
X1/ICLK
Crystal or
Clock Input
X2
Crystal
Oscillator
External capacitors
are required with a crystal input.
VDD 3
PLL1 with
Spread
Spectrum
PLL2
PLL3
Divide
Logic
and
Output
Enable
Control
GND 3
PDTS
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
MDS 290 C
1
Revision 062305
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
1 page  
PRELIMINARY INFORMATION
ICS290
Triple PLL Field Prog. Spread Spectrum Cwlwowck.DaStaySnhethete4Us.iczoemr
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature -40 to +85°C
Parameter
Symbol
Conditions
Min. Typ.
Operating Voltage
VDD
3.135
Operating Supply Current
Config. Dependent - See
VersaClockTM Estimates
IDD Eight 33.3333 MHz outs,
PDTS = 1, no load, Note 1
27
Input High Voltage
Input Low Voltage
Input High Voltage, PDTS
Input Low Voltage, PDTS
Input High Voltage
Input Low Voltage
Output High Voltage
(CMOS High)
PDTS = 0, no load
VIH S2:S0
VIL S2:S0
VIH
VIL
VIH ICLK
VIL ICLK
VOH IOH = -4 mA
500
VDD/2+1
VDD-0.5
VDD/2+1
VDD-0.4
Output High Voltage
Output Low Voltage
Short Circuit Current
VOH IOH = -8 mA (Low Drive);
IOH = -12 mA (High Drive)
2.4
VOL IOL = 8 mA (Low Drive);
IOL = 12 mA (High Drive)
IOS Low Drive
±40
High Drive
±70
Nom. Output Impedance
Internal pull-up Resistor
Internal pull-down
Resistor
ZO
RPUS
RPD
S2:S0, PDTS
CLK outputs
20
190
120
Input Capacitance
CIN Inputs
4
Max.
3.465
Units
V
mA
mA
0.4
0.4
VDD/2-1
µA
V
V
V
V
V
V
V
V
0.4 V
mA
Ω
kΩ
kΩ
pF
Note 1: Example with 25 MHz crystal input with eight outputs of 33.3 MHz, no load, and VDD = 3.3 V.
MDS 290 C
5
Revision 062305
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ICS290.PDF ] | |
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