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PL611S-28-XXXTIR Datasheet(PDF) 3 Page - PhaseLink Corporation |
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PL611S-28-XXXTIR Datasheet(HTML) 3 Page - PhaseLink Corporation |
3 / 9 page (Preliminary)PL611 s-28 1.8V-3.3V PicoPLL TM, World’s Smallest Programmable Clock 47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 3/9/07 Page 3 FUNCTIONAL DESCRIPTION PL611s-28 is a highly featured, very flexible, advanced programmable PLL design for high performance, low- power, small form-factor applications. The PL611s-28 accepts a fundamental input crystal of 10MHz to 50MHz or reference clock input of 1MHz to 200MHz and is capable of producing two outputs up to 125MHz. This flexible design allows the PL611s-28 to deliver any PLL generated frequency, FREF (Crystal or Ref Clk) frequency or FREF /(2*P) to CLK0 and/or CLK1. Some of the design features of the PL611s-28 are mentioned below: PLL Programming The PLL in the PL611s-28 is fully programmable. The PLL is equipped with an 8-bit input frequency divider (R-Counter), and an 11-bit VCO frequency feedback loop divider (M-Counter). The output of the PLL is transferred to a 5-bit post VCO divider (P- Counter). The output frequency is determined by the following formula [FOUT = FREF * M / (R * P) ]. Clock Output (CLK0) CLK0 is the main clock output. The output of CLK0 can be configured as the PLL output (FVCO/(2*P)), FREF (Crystal or Ref Clk Frequency) output, or FREF/(2*P) output. Clock Output (CLK1) The CLK1 feature allows the PL611s-28 to have an additional clock output. This output can be programmed to one of the following: FREF - Reference (Crystal or Ref Clk) Frequency FREF / 2 CLK0 CLK0 / 2 The output drive level can be programmed to Low Drive (4mA), Standard Drive (8mA) or High Drive (16mA) for each clock independently. The maximum output frequency is 125MHz. Output Enable (OE) The Output Enable feature allows the user to enable and disable the clock output(s) by toggling the OE pin. The OE pin incorporates a 60k pull up resistor giving a default condition of logic “1”. The OE feature can be programmed to allow the output to float (Hi Z), or to operate in the ‘Active low’ mode. Power-Down Control (PDB) The Power Down (PDB) feature allows the user to put the PL611s-28 into “Sleep Mode”. When activated (logic ‘0’), PDB ‘Disables the PLL, the oscillator circuitry, counters, and all other active circuitry. In Power Down mode the IC consumes <10 A of power. The PDB pin incorporates a 60k pull up resistor giving a default condition of logic “1”. The PDB feature can be programmed to allow the output to float (Hi Z), or to operate in the ‘Active low’ mode. Frequency Select (FSEL) The Frequency Select (FSEL) feature allows the PL611s-28 to switch between two pre-programmed outputs allowing the device “On the Fly” frequency switching. The FSEL pin incorporates a 60k pull up resistor giving a default condition of logic “1”. |
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