CY2291

Three-PLL General Purpose EPROMProgrammable Clock Generator
CypressSemiconductor 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–1 00 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–9 0 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–9 0 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–8 0 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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