CY5057_08 Datasheet, PDF (1/10 Pages) Cypress Semiconductor – High-Frequency Flash Programmable PLL Die with Spread Spectrum

CY5057
High-Frequency Flash Programmable
PLL Die with Spread Spectrum
Features
■ Flash programmable die for in-package programming of crystal
oscillators
■ High resolution phase-locked loop (PLL) with 10-bit multiplier
and 7-bit divider
■ Flash programmable capacitor tuning array
■ Simple 2-pin programming interface (excluding VDD and VSS
pins)
■ On-chip oscillator used with external 25.1 MHz fundamental
tuned crystal
■ Flash programmable spread spectrum with spread
percentages between +0.25% and +2.00%
■ Spread spectrum on/off function
■ Operating frequency
❐ 5 to 170 MHz at 3.3V ± 10%
■ Seven-bit linear post divider with divide options from
divide-by-2 to divide-by-127
■ Programmable PD# or OE pin
■ Programmable asynchronous or synchronous OE and PD#
modes
■ Low jitter output
❐ < 200 ps (pk-pk) at 3.3V ± 10%
■ Controlled rise and fall times and output slew rate
■ Software configuration support
Benefits
■ Enables quick turnaround of custom oscillators and lowers
inventory costs through stocking blank parts. In addition, the
part may be Flash programmed up to 100 times. This reduces
programming errors and provides an easy upgrade path for
existing designs.
■ Enables synthesis of highly accurate and stable output clock
frequencies with zero or low PPM.
■ Enables fine tuning of output clock frequency by adjusting the
CLoad of the crystal.
■ Allows the device to go into standard 4 or 6-pin packages.
■ Lowers cost of oscillator, because PLL may be programmed to
a high frequency using a low frequency, low cost crystal.
■ Provides various spread percentage.
■ Provides the ability to enable or disable spread spectrum with
an external pin.
■ Provides flexibility in output configurations and testing.
■ Enables low operation or output enable function.
■ Provides flexibility for system applications through selectable
instantaneous or synchronous change in outputs.
■ Suitable for most PC, consumer, and networking applications.
■ Has lower EMI than oscillators.
■ Easy to use software support for design entry.
Logic Block Diagram
XIN
XOUT
Crystal Osc
with 8-bit
Cap Array
SSON#
Spread
Spectrum
PD#/OE
7-bit
÷Q
10-bit
÷P
100- to
400-MHz
PLL
7-bit
Output
Divider
Block
Flash Configuration/
Spread Spectrum Storage
OUT
Cypress Semiconductor Corporation • 198 Champion Court
Document #: 38-07363 Rev. *E
• San Jose, CA 95134-1709 • 408-943-2600
Revised November 3, 2008
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