ICS502
LOCO™ PLL Clock Multiplier
Description
The ICS502 LOCO™ is the most cost effective way to generate a high quality, high frequency clock output and a reference from a low frequency crystal or clock input. The name LOCO stands for LOw Cost Oscillator, as it is designed to replace crystal oscillators in most electronic systems. Using Phase-Locked-Loop (PLL) techniques, the device uses a standard fundamental mode, inexpensive crystal to produce output clocks up to 160 MHz.Stored in the chip’s ROM is the ability to generate 6 different multiplication factors, allowing one chip to output many common frequencies (see page 2).
Features
• Packaged as 8 pin SOIC or die
• ICS’ lowest cost PLL clock plus reference• Zero ppm multiplication error
• Easy to cascade with other 5xx series• Input crystal frequency of 5 - 27 MHz• Input clock frequency of 2 - 50 MHz• Output clock frequencies up to 160 MHz• Low jitter - 50 ps one sigma
• Compatible with all popular CPUs• Duty cycle of 45/55 up to 160 MHz• Operating voltages of 3.0 to 5.5V
• Industrial temperature version available• 25mA drive capability at TTL levels• Advanced, low power CMOS process
Block Diagram
VDDGND
2S1, S0PLLClockSynthesisand Control CircuitryOutputBufferCLK
crystal or clock
X1/ICLKCrystalOscillatorX2OutputBufferREF
MDS 502 D 1 Revision 111000
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
元器件交易网www.cecb2b.com
ICS502
LOCO™ PLL Clock Multiplier
Pin Assignment
X1/ICLKVDDGNDREF
1234
8765
X2S1S0CLK
Clock Decoding Table (MHz)
S100MM11S0010101CLKx2x5x3x3.33x4x2.5Minimum input frequency for all selections is per table on page 3.
0 = connect directly to ground.1 = connect directly to VDD.M = leave unconnected (floating).
Common Output Frequencies Examples (MHz)
OutputInputSelection (S1, S0)OutputInputSelection (S1, S0)20100, 064161, 025101, 166.6620M, 13010M, 07224M, 032160, 075150, 133.3310M, 180201, 037.5151, 18127M, 040200, 09027M, 14816M, 0100200, 150201, 1108271, 05413.51, 0120240, 16020M, 0135270, 1Note that all of the above outputs are achieved by using an inexpensive 10MHz to 27MHz crystal.Consult MicroClock/ICS on how to achieve other output frequencies.
Pin Descriptions
Number12345678Name X1/ICLKVDDGNDREFCLKS0S1X2TypeIPPOOITIODescriptionCrystal connection or clock input.Connect to +3.3V or +5V.Connect to ground.Buffered crystal oscillator output clock.Clock output per Table above. Select 0 for output clock. Connect to GND or VDD. Select 1 for output clock. Connect to GND or VDD or float. Crystal connection. Leave unconnected for clock input.Key: I = Input, TI = Tri-Level Input, O = output, P = power supply connection
MDS 502 D 2 Revision 111000
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
元器件交易网www.cecb2b.com
ICS502
LOCO™ PLL Clock Multiplier
Electrical Specifications
ParameterConditionsMinimumTypicalABSOLUTE MAXIMUM RATINGS (stresses beyonbeyond these can permanentlynently damage the d the device) Supply Voltage, VDDReferenced to GNDInputsReferenced to GND-0.5Clock OutputReferenced to GND-0.5Ambient Operating Temperature0ICS502MI only-40Soldering TemperatureMax of 10 secondsStorage temperature-65DC CHARACTERISTICS (VDD = 5.0V unless othss otherwise noted)Operating Voltage, VDD 3Input High Voltage, VIH, ICLK onlyICLK (Pin 1)(VDD/2)+1VDD/2Input Low Voltage, VIL, ICLK onlyICLK (Pin 1)VDD/2Input High Voltage, VIHS02Input Low Voltage, VILS0Input High Voltage, VIHS1VDD-0.5Input Low Voltage, VILS1Output High Voltage, VOHIOH=-25mA2.4Output Low Voltage, VOLIOL=25mAIDD Operating Supply Current, 20 MHz crystalNo Load, 100MHz20Short Circuit CurrentCLK output ±70On-Chip Pull-up ResistorPin 6270Input Capacitance, S1, S0Pins 6, 74AC CHARACTERISTICS (VDD = 5.0V unless othess otherwise noted)Input Frequency, crystal input5 Input Frequency, clock input2 Output Frequency, VDD = 4.5 to 5.5V0 C to +70 C14 -40 C to +85 C14 Output Frequency, VDD = 3.0 to 3.6V0 C to +70 C14 -40 C to +85 C14 Output Clock Rise Time0.8 to 2.0V1Output Clock Fall Time2.0 to 0.8V1Output Clock Duty Cycleat VDD/24549 to 51Absolute Clock Period JitterDeviation from mean ±120One Sigma Clock Period Jitter50Maximum7VDD+0.5VDD+0.570852601505.5(VDD/2)-10.80.50.4UnitsVVVCCCCVVVVVVVVVmAmAkΩpFMHzMHzMHzMHzMHzMHznsns%psps275016014010090 55 MDS 502 D 3 Revision 111000
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
元器件交易网www.cecb2b.com
ICS502
LOCO™ PLL Clock Multiplier
External Components / Crystal Selection
The ICS502 requires a 0.01µF decoupling capacitor to be connected between VDD and GND. It must be connected close to the ICS502 to minimize lead inductance. No external power supply filtering is required for this device. A 33Ω terminating resistor can be used next to the CLK pin. The total on-chip capacitance is approximately 13 pF, so a parallel resonant, fundamental mode crystal should be used. For crystals with a specified load capacitance greater than 13 pF, crystal capacitors should be connected from each of the pins X1 and X2 to Ground as shown in the Block Diagram on page 1. The value (in pF) of these crystal caps should be = (CL-13)*2, where CL is the crystal load capacitance in pF. These external capacitors are only required for applications where the exact frequency is critical. For a clock input, connect to X1 and leave X2 unconnected (no capacitors on either).
Package Outline and Package Dimensions
8 pin SOIC
EPin 1H Inchesnches MillimetlimetersSymbolMinMaxMinMaxA0.0550.0681.3971.7272b0.0130.0190.3300.483D0.1850.2004.6995.080E0.1500.1603.8104.064H0.2250.2455.7156.223e .050 BSC0 BSC 1.27 BSC7 BSCh0.0150.381Q0.0040.010.1020.254DQebch x 45°AOrdering InformationPart/Order NumberICS502MICS502MTICS502MIICS502MITMarkingICS502MICS502MICS502IICS502IPackage8 pin SOIC8 pin SOIC on tape and reel8 pin SOIC8 pin SOIC on tape and reelTemperature0 to 70 C0 to 70 C-40 to +85 C-40 to +85 CWhile the information presented herein has been checked for both accuracy and reliability, ICS/MicroClock assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal
commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS/MicroClock. ICS/MicroClock reserves the right to change any circuitry or specifications without notice. ICS/MicroClock does not authorize or warrant any ICS/MicroClock product for use in life support devices or critical medical instruments.
LOCO is a trademark of ICS
MDS 502 D 4 Revision 111000
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
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