PDF CY29973 Data sheet ( Hoja de datos )

Número de pieza	CY29973
Descripción	3.3V 125-MHz Multi-Output Zero Delay Buffer
Fabricantes	Cypress Semiconductor
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No Preview Available ! CY29973 3.3V 125-MHz Multi-Output Zero Delay Buffer Features ■ Output Frequency up to 125 MHz ■ 12 Clock Outputs: Frequency Configurable ■ 350 ps max. Output to Output Skew ■ Configurable Output Disable ■ Two Reference Clock Inputs for Dynamic Toggling ■ Oscillator or PECL Reference Input Table 1. Frequency Table[1] VC0_SEL 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 FB_SEL2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 ■ Spread Spectrum Compatible ■ Glitch-free Output Clocks Transitioning ■ 3.3V Power Supply ■ Pin Compatible with MPC973 ■ Industrial Temperature Range: - 40°C to +85°C ■ 52-Pin TQFP Package FB_SEL1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 FB_SEL0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 FVC0 8x 12x 16x 20x 16x 24x 32x 40x 4x 6x 8x 10x 8x 12x 16x 20x Note 1. x = the reference input frequency, 200 MHz < FVCO < 480 MHz. Cypress Semiconductor Corporation • 198 Champion Court wwwD.DocautamSheenett4#U: .3n8et-07291 Rev. C • San Jose, CA 95134-1709 • 408-943-2600 Revised September 09, 2008 [+] Feedback 1 page CY29973 SYNC Output In situations were output frequency relationships are not integer multiples of each other the SYNC output provides a signal for system synchronization. The CY29973 monitors the relationship between the QA and the QC output clocks. It provides a low going pulse, one period in duration, one period prior to the coincident rising edges of the QA and QC outputs. The duration and the placement of the pulse depend on the higher of the QA and QC output frequencies. The following timing diagram illustrates various waveforms for the SYNC output. Note that the SYNC output is defined for all possible combinations of the QA and QC outputs even though under some relationships the lower frequency clock could be used as a synchronizing signal. Figure 1. SYNC Output for Different Input and Out Ratio VCO 1:1 Mode QA QC SYNC 2:1 Mode QA QC SYNC QC QA SYNC 3:1 Mode QA QC SYNC QC QA SYNC QA QC SYNC QA QC 3:2 Mode 4:1 Mode 4:3 Mode 6:1 Mode SYNC Document #: 38-07291 Rev. C Page 5 of 9 [+] Feedback 5 Page

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PDF Descargar	[ Datasheet CY29973.PDF ]

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