PL611S-08 Datasheet, PDF (3/8 Pages) PhaseLink Corporation – Low-Power Programmable Quick Turn ClockTM

P (Preliminary) L611s-08
Low-Power Programmable Quick Turn Clock^TM
FUNCTIONAL DESCRIPTION
PL611s-08 is a highly featured, very flexible, advanced programmable PLL design for high performance, low-
power, small form-factor applications. The PL611s-08 accepts a fundamental input crystal of 10MHz to 50MHz or
reference clock input of 1MHz to 100MHz and is capable of producing two outputs up to 75MHz. This flexible
design allows the PL611s-08 to deliver any PLL generated frequency, FREF (Crystal or Ref Clk) frequency or
FREF/2 to CLK0 and/or CLK1. Some of the design features of the PL611s-08 are mentioned below:
PLL Programming
The PLL in the PL611s-08 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 PL611s-08 can
also be programmed to provide a second clock
output, CLK1, on the programmable I/O pin (see OE
/CLK1 pin description below). The output of CLK0
can be configured as the PLL output (FVCO/(2*P)),
FREF (Crystal or Ref Clk Frequency) output, or FREF/2
output. The output drive level can be programmed to
Low Drive (4mA), Standard Drive (8mA) or High Drive
(16mA). The maximum output frequency is 75MHz.
Programmable I/O (OE/CLK1)
The PL611s-08 provides one programmable I/O pin
which can be configured as one of the following
functions:
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 60kΩ pull up resistor giving a
default condition of logic “1”.
Clock Output (CLK1)
The CLK1 feature allows the PL611s-08 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
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