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PDF ICS650-44 Data sheet ( Hoja de datos )

Número de pieza ICS650-44
Descripción Spread Spectrum Clock Synthesizer
Fabricantes Integrated Circuit Systems 
Logotipo Integrated Circuit Systems Logotipo



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P R E L I M I N A RY I N F O R M AT I O N
ICS650-44
Spread Spectrum Clock Synthesizer
Description
The ICS650-44 is a spread spectrum clock synthesizer
intended for video projector and digital TV applications.
It generates three copies of an EMI optimized 50 MHz
clock signal (EMI peak reduction of 7 to 14 dB on 3rd
through 19th harmonics) through the use of Spread
Spectrum techniques from a 25 MHz crystal or clock
input. The modulation rate is 50 kHz.
Features
Packaged in 16-pin TSSOP (173 mil)
Supply voltages: VDD = 3.3 V, VDDO = 2.5 V
Peak-to-peak jitter: ±125 ps typ
Output duty cycle 45/55% (worst case)
25 MHz crystal or reference clock input
Zero (0) ppm frequency error on all output clocks
Advanced, low-power CMOS process
Industrial temperature range (-40 to +85°C)
Available in Pb (lead) free package
Block Diagram
25 MHz crystal
or clock input
X1/CLKIN
X2
External capacitors are
required with a crystal
input.
FS3:0
Crystal
OSC
Control
Logic
VDD
3
VDDO
PLL with
Spread
Spectrum
50M
50M
50M
GND 2
PDTS
MDS 650-44 C
1
Revision 080305
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com

1 page




ICS650-44 pdf
P R E L I M I N A RY I N F O R M AT I O N
ICS650-44
Spread Spectrum Clock Synthesizer
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±5%, VDDO = 2.5 V ±5% , Ambient Temperature -40 to +85°C
Parameter
Symbol
Conditions
Min. Typ. Max. Units
no load
IDD
27 mA
Operating Supply Current
IDDO
PDTS = 0, no load
no load
PDTS = 0, no load
40 uA
4 mA
1 uA
Input High Voltage
Input Low Voltage
Input High Voltage
VIH FS3:0, PDTS
VIL FS3:0, PDTS
VIH X1/CLKIN
2
0.7 x
VDD
V
0.8 V
V
Input Low Voltage
VIL X1/CLKIN
0.3 x
VDD
V
Output High Voltage
Output Low Voltage
Short Circuit Current
Nominal Output
Impedance
VOH
VOL
IOS
ZO
IOH = -4 mA
IOL = 4 mA
1.8 V
0.6 V
±50 mA
20
Internal Pull-up Resistor
Input Leakage Current
Internal Pull-down
Resistor
RPU FS3:0, PDTS
II FS3:0, PDTS, VIN=VDD
RPD CLK outputs
360 k
1 uA
900 k
Input Capacitance
CIN Inputs
4 pF
MDS 650-44 C
5
Revision 080305
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com

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