Cypress CY2291 - Manual

CY2291
Three-PLL General Purpose EPROM
Programmable Clock Generator
Cypress Semiconductor Corporation • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600
Document #: 38-07189 Rev. *C Revised September 16, 2008
Features
■ Three integrated phase-locked loops
■ EPROM programmability
■ Factory-programmable (CY2291) or field-programmable
(CY2291F) device options
■ Low-skew, low-jitter, high-accuracy outputs
■ Power-management options (Shutdown, OE, Suspend)
■ Frequency select option
■ Smooth slewing on CPUCLK
■ Configurable 3.3V or 5V operation
■ 20-pin SOIC Package
Benefits
■ Generates up to three custom frequencies from external
sources
■ Easy customization and fast turnaround
■ Programming support available for all opportunities
■ Meets critical industry standard timing requirements
■ Supports low-power applications
■ Eight user-selectable frequencies on CPU PLL
■ Allows downstream PLLs to stay locked on CPUCLK output
■ Enables application compatibility
■ Industry-standard packaging saves on board space
Part Number Outputs Input Frequency Range Output Frequency Range Specifics
CY2291 8 10 MHz–25 MHz (external crystal)
1 MHz–30 MHz (reference clock) 76.923 kHz–100 MHz (5V)
76.923 kHz–80 MHz (3.3V) Factory Programmable
Commercial Temperature
CY2291I 8 10 MHz–25 MHz (external crystal)
1 MHz–30 MHz (reference clock) 76.923 kHz–90 MHz (5V)
76.923 kHz–66.6 MHz (3.3V) Factory Programmable
Industrial Temperature
CY2291F 8 10 MHz–25 MHz (external crystal)
1 MHz–30 MHz (reference clock) 76.923 kHz–90 MHz (5V)
76.923 kHz–66.6 MHz (3.3V) Field Programmable
Commercial Temperature
CY2291FI 8 10 MHz–25 MHz (external crystal)
1 MHz–30 MHz (reference clock) 76.923 kHz–80 MHz (5V)
76.923 kHz–60.0 MHz (3.3V) Field Programmable
Industrial Temperature
Logic Block Diagram
32XIN
32XOUT
XTALIN
XTALOUT
S2/SUSPEND
S1
S0
SHUTDOWN/
32K
CONFIG
EPROM
OSC. XBUF
CPLL
SPLL
UPLL
OSC.
CPUCLK
CLKA
CLKB
CLKC
CLKD
MUX
OE
CLKF
/1,2,4
/1,2,3,4,5,6
/8,10,12,13
/20,24,26,40
/48,52,96,104
/2,3,4
/1,2,4,8
(8 BIT)
(8 BIT)
(10 BIT)
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