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ICS308RLFT Datasheet(PDF) 1 Page - Integrated Device Technology |
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ICS308RLFT Datasheet(HTML) 1 Page - Integrated Device Technology |
1 / 9 page DATASHEET SERIAL PROGRAMMABLE QUAD PLL VERSACLOCK SYNTHESIZER ICS308 IDT™ / ICS™ SERIAL PROGRAMMABLE QUAD PLL VERSACLOCK SYNTHESIZER 1 ICS308 REV J 120507 Description The ICS308 is a versatile serially programmable, quad PLL clock source. The ICS308 can generate any frequency from 250 kHz to 200 MHz, and up to 6 different output frequencies simultaneously. The outputs can be reprogrammed on the fly, and will lock to a new frequency in 10 ms or less. Smooth transitions (in which the clock duty cycle remains roughly 50%) are guaranteed if the output divider is not changed. The device includes a PDTS pin which tri-states the output clocks and powers down the entire chip. The ICS308 default for non-programmed start-up are buffered reference clock outputs on all clock output pins. Features • Packaged in 20-pin SSOP (QSOP) • Available in Pb (lead) free package • Operating voltage of 3.3 V • Highly accurate frequency generation • M/N Multiplier PLL: M = 1..2048, N = 1..1024 • Serially programmable: user determines the output frequency via a 3-wire interface • Eliminates need for custom quartz oscillators • Input crystal frequency of 5 - 27 MHz •Optional programmable on-chip crystal capacitors • Output clock frequencies up to 200 MHz • Reference clock output • Power down tri-state mode • Very low jitter Block Diagram C rystal O scillator GN D 2 3 VDD PDT S PLL2 PLL3 Divide Logic and Output Enable Control SCLK DATA CLK1 CLK9 CLK8 CLK7 CLK6 CLK5 CLK4 CLK3 CLK2 PLL4 PLL1 X2 Cry stal or cloc k input E xternal capacitors are required w ith a crystal input. X 1/IC LK STROBE |
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