Cypress CY2291 manual Features, Benefits, Logic Block Diagram

CY2291

Three-PLL General Purpose EPROM Programmable Clock Generator

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)	76.923 kHz–100 MHz (5V)	Factory Programmable
		1 MHz–30 MHz (reference clock)	76.923 kHz–80 MHz (3.3V)	Commercial Temperature
CY2291I	8	10 MHz–25 MHz (external crystal)	76.923 kHz–90 MHz (5V)	Factory Programmable
		1 MHz–30 MHz (reference clock)	76.923 kHz–66.6 MHz (3.3V)	Industrial Temperature
CY2291F	8	10 MHz–25 MHz (external crystal)	76.923 kHz–90 MHz (5V)	Field Programmable
		1 MHz–30 MHz (reference clock)	76.923 kHz–66.6 MHz (3.3V)	Commercial Temperature
CY2291FI	8	10 MHz–25 MHz (external crystal)	76.923 kHz–80 MHz (5V)	Field Programmable
		1 MHz–30 MHz (reference clock)	76.923 kHz–60.0 MHz (3.3V)	Industrial Temperature

Logic Block Diagram

32XIN	OSC.			32K
32XOUT
XTALIN	OSC.			XBUF
XTALOUT
	CPLL
		/1,2,4		CPUCLK
S0	(8 BIT)
S1				CLKA
S2/SUSPEND	UPLL			CLKB
		/1,2,4,8	MUX
	(10 BIT)
		/1,2,3,4,5,6		CLKC
	SPLL	/8,10,12,13		CLKD
		/20,24,26,40
	(8 BIT)	/48,52,96,104
		/2,3,4		CLKF
			CONFIG
SHUTDOWN/			EPROM
OE

Cypress Semiconductor Corporation • 198 Champion Court	•	San Jose, CA 95134-1709	•	408-943-2600
Document #: 38-07189 Rev. *C		Revised September 16, 2008

[+] Feedback