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PDF ICS270 Data sheet ( Hoja de datos )

Número de pieza ICS270
Descripción Triple PLL Field Programmable VCXO Clock Synthesizer
Fabricantes Integrated Circuit Systems 
Logotipo Integrated Circuit Systems Logotipo



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PRELIMINARY INFORMATION
ICS270
Triple PLL Field Programmable VCXO Clock Synthesizer
Description
The ICS270 field programmable VCXO 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 and crystal oscillators in
most electronic systems.
Using ICS’ VersaClockTM software to configure PLLs
and outputs, the ICS270 contains a One-Time
Programmable (OTP) ROM for field programmability.
Programming features include VCXO, 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 VCXOs,
multiple crystals and oscillators, saving board space
and cost.
The ICS270 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
Input crystal frequency of 5 to 27 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
VDD 3
3
S2:S0
OTP
ROM
with
PLL
Values
VIN
X1
Crystal
X2
Voltage
Controlled
Crystal
Oscillator
External capacitors
are required.
PLL1
PLL2
PLL3
Divide
Logic
and
Output
Enable
Control
GND 2
PDTS
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
MDS 270 B
1
Revision 040705
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com

1 page




ICS270 pdf
PRELIMINARY INFORMATION
ICS270
Triple PLL Field Programmable VCXO Clock
Parameter
Storage Temperature
Soldering Temperature
Junction Temperature
Condition
Max 10 seconds
Recommended Operation Conditions
Min.
-65
Typ.
Max.
150
260
125
Units
°C
°C
°C
Parameter
Ambient Operating Temperature (ICS270PG/PGLF)
Ambient Operating Temperature (ICS270PGI/PGILF)
Power Supply Voltage (measured in respect to GND)
Power Supply Ramp Time
Reference crystal parameters
Min.
0
-40
+3.135
Typ.
Max.
+70
+85
+3.3 +3.465
4
Refer to page 3
Units
°C
°C
V
ms
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature -40 to +85°C
Parameter
Symbol
Conditions
Min.
Operating Voltage
VDD
3.135
Config. Dependent - See
VersaClockTM Estimates
Operating Supply Current
Input High Voltage
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)
Eight 33.3333 MHz outs,
IDD PDTS = 1, no load, Note 1
PDTS = 0, no load, Note 1
VIH S2:S0
VDD/2+1
VIL S2:S0
VIH VDD-0.5
VIL
VIH ICLK
VDD/2+1
VIL ICLK
VOH IOH = -4 mA
VDD-0.4
Output High Voltage
Output Low Voltage
Short Circuit Current
VOH IOH = -8 mA (Low Drive);
IOH = -12 mA (High Drive)
VOL IOL = 8 mA (Low Drive);
IOL = 12 mA (High Drive)
IOS Low Drive
High Drive
2.4
Nom. Output Impedance
ZO
Typ.
27
500
±40
±70
20
Max.
3.465
0.4
0.4
VDD/2-1
0.4
Units
V
mA
mA
µA
V
V
V
V
V
V
V
V
V
mA
MDS 270 B
5
Revision 040705
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com

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