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PL611S-19 Datasheet, PDF (3/8 Pages) PhaseLink Corporation – 0.5kHz-55MHz MHz to KHz Programmable ClockTM | |||
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P (Preliminary) L611s-19
0.5kHz-55MHz MHz to KHz Programmable ClockTM
FUNCTIONAL DESCRIPTION
PL611s-19 is a highly featured, very flexible, advanced programmable PLL design for high performance, low-
power, small form-factor applications. The PL611s-19 accepts a reference clock input of 1MHz to 200MHz and is
capable of producing two outputs up to 125MHz. This flexible design allows the PL611s-19 to deliver any PLL
generated frequency, FREF (Ref Clk) frequency or FREF /(2*P) to CLK0 and/or CLK1. Some of the design features
of the PL611s-19 are mentioned below:
PLL Programming
The PLL in the PL611s-19 is fully programmable.
The PLL is equipped with an 5-bit input frequency
divider (R-Counter), and an 8-bit VCO frequency
feedback loop divider (M-Counter). The output of
the PLL is transferred to a 14-bit post VCO divider
(P-Counter). The output frequency is determined by
the following formula [FOUT = FREF * M / (R * P) ].
Clock Output (CLK0)
The output of CLK0 can be configured as the PLL output
(FVCO/(2*P)), FREF (Ref Clk Frequency) output, or
FREF/(2*P) output. The output drive level can be
programmed to Low Drive (4mA), Standard Drive
(8mA) or High Drive (16mA). The maximum output
frequency is 125MHz.
Clock Output (CLK1)
The output of CLK1 can be configured as:
FREF - Reference ( Ref Clk ) Frequency
FREF / 2
CLK0
CLK0 / 2
When using the OE function CLK1 will remain
âAlways Onâ and will not be disabled when OE is
pulled low. When using the PDB function CLK1 will
be disabled along with CLK0. The output drive level
can be programmed to Low Drive (4mA), Standard
Drive (8mA) or High Drive (16mA). The maximum
output frequency is 125MHz.
Programmable I/O (OE/PDB/FSEL)
The PL611s-19 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 CLK0 clock output by toggling the OE
pin. CLK1 remains active when OE is pulled low.
The OE pin incorporates a 60k⦠pull up resistor
giving a default condition of logic â1â.
The OE feature can be programmed to allow the
output to float (Hi Z), or to operate in the âActive lowâ
mode.
Power-Down Control (PDB)
The Power Down (PDB) feature allows the user to put
the PL611s-19 into âSleep Modeâ. When activated
(logic â0â), PDB âDisables the PLL, the oscillator
circuitry, counters, and all other active circuitry. In
Power Down mode the IC consumes <5µA of power.
The PDB pin incorporates a 60k⦠pull up resistor
giving a default condition of logic â1â.
The PDB feature can be programmed to allow the
output to float (Hi Z), or to operate in the âActive lowâ
mode.
Frequency Select (FSEL)
The Frequency Select (FSEL) feature allows the
PL611s-19 to switch between two pre-programmed
outputs allowing the device âOn the Flyâ frequency
switching. The FSEL pin incorporates a 60k⦠pull up
resistor giving a default condition of logic â1â.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 12/12/06 Page 3
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