PDF ICS342 Data sheet ( Hoja de datos )

Número de pieza	ICS342
Descripción	FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER
Fabricantes	Integrated Circuit Systems
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No Preview Available ! ICS342 Field Programmable Dual Output SS VersaClock Synthesizer Description The ICS342 is a low cost, dual-output, field programmable clock synthesizer. The ICS342 can generate two output frequencies from 250 kHz to 200 MHz, using up to two independently configurable PLLs. The outputs may employ Spread Spectrum techniques to reduce system electro-magnetic interference (EMI). Using ICS’ VersaClockTM software to configure the PLL and output, the ICS342 contains a One-Time Programmable (OTP) ROM to allow field programmability. Programming features include 2 selectable configuration registers. 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 device also has a power down feature that tri-states the clock outputs and turns off the PLLs when the PDTS pin is taken low. The ICS342 is also available in factory programmed custom versions for high-volume applications. Features • 8-pin SOIC package • Highly accurate frequency generation • M/N Multiplier PLL: M = 1...2048, N = 1...1024 • Output clock frequencies up to 200 MHz • Two ROM locations for frequency and spread selection • Spread spectrum capability for lower system EMI • Center or Down Spread up to 4% total • Selectable 32 kHz or 120 kHz modulation • Input crystal frequency from 5 to 27 MHz • Input clock frequency from 2 to 50 MHz • Operating voltage of 3.3 V • Advanced, low power CMOS process • For one output clock, use the ICS341. For three output clocks, see the ICS343. For more than three outputs, see the ICS345 or ICS348. • Available in Pb (lead) free packaging Block Diagram SEL Crystal or clock input X1/ICLK X2 OTP ROM with PLL Divider Values Crystal Oscillator External capacitors are required with a crystal input. VDD PLL Clock Synthesis, Spred Spectrum and Control Circuitry CLK1 CLK2 GND PDTS (both outputs and PLL) MDS 342 F 1 Revision 090704 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com 1 page ICS342 Field Programmable Dual Output SS VersaClock Parameter Output High Voltage (CMOS High) Output High Voltage Output Low Voltage Short Circuit Current Nominal Output Impedance Internal pull-up resistor Internal pull-down resistor Input Capacitance Symbol Conditions VOH IOH = -4 mA VOH VOL IOS ZO IOH = -12 mA IOL = 12mA RPUP RPD SEL, PDTS pins CLK output CIN Inputs Min. Typ. VDD-0.4 Max. Units V 2.4 V 0.4 V ±70 mA 20 Ω 250 kΩ 525 kΩ 4 pF Note 1: Example with 25 MHz crystal input with two outputs of 33.3 MHz, no load, and VDD = 3.3 V. AC Electrical Characteristics Unless stated otherwise, VDD = 3.3V ±5%, Ambient Temperature -40 to +85° C Parameter Symbol Conditions Min. Typ. Max. Units Input Frequency FIN Fundamental Crystal Input Clock 5 2 27 MHz 50 MHz Output Frequency 0.25 200 MHz Output Rise Time Output Fall Time Duty Cycle tOR 20% to 80%, Note 1 tOF 80% to 20%, Note 1 Note 2 1 1 40 49-51 60 ns ns % Power-up time PLL lock time from power-up, Note 3 4 10 ms PDTS goes high until stable CLK output, Spread Spectrum Off, Note 3 0.2 2 ms PDTS goes high until stable CLK output, Spread Spectrum On, Note 3 4 7 ms One Sigma Clock Period Jitter Configuration Dependent 50 ps Maximum Absolute Jitter tja Deviation from Mean. Configuration Dependent +200 ps Note 1: Measured with 15 pF load. Note 2: Duty Cycle is configuration dependent. Most configurations are minimum 45% and maximum 55%. Note 3: ICS test mode output occurs for first 170 clock cycles on CLK2 for each PLL powered up. PDTS transition high on select address change. MDS 342 F 5 Revision 090704 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com 5 Page

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Número de pieza	Descripción	Fabricantes
ICS341	Field Programmable SS VersaClock Synthesizer	Integrated Circuit Solution
ICS342	FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER	Integrated Circuit Systems
ICS343	Field Programmable Triple Output SS VersaClock Synthesizer	Integrated Circuit Solution
ICS345	Triple PLL Field Programmable SS VersaClock Synthesizer	Integrated Circuit Systems

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