Instruction/ maintenance manual of the product CY7B9911V Cypress
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CY7B991 1V 3.3V RoboClock+™ High Sp eed Low V olt age Programmable Skew Clock Buffer Cypress Semiconductor Corpora tion • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600 Document Number: 38-07408 Rev . *D Revised June 20, 2007 Features ■ All output pair skew <100 ps typical (250 max) ■ 3.
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 2 of 14 Pin Configuration Pin Definitions Signal Name IO Description REF I Reference frequency input. This input supplies t he frequency and timi ng against which all functional variations ar e me asu re d .
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 3 of 14 Block Diagram Description Phase Frequency Detect or an d Filter The Phase Frequency Detector and Filter blocks accept inputs from the Reference Frequency (REF) input an d the Feedback (FB) input.
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 4 of 14 Figure 1 shows the typical outputs with FB connected to a zero skew output.
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 5 of 14 Operational M ode Descriptions Figure 2 shows the L VPSCB configured as a zero skew clock buffer . In this mode the CY7B991 1V is used as the basis for a low skew clock distribution tree.
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 6 of 14 groups, and the PLL aligns the rising edges of REF and FB, you can create wider output skews by proper selection of the xFn inputs. For example, a +10 tU between REF and 3Qx is achieved by connecting 1Q0 to FB and setting 1F 0 = 1F1 = GND , 3F0 = MID, and 3F1 = High.
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 7 of 14 frequency , while still maintaining the low ske w characteristics of the clock driver . The L VPSCB pe rforms all of the functions described in this section at the same time.
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 8 of 14 Maximum Ratin gs Operating outside these boundaries may affect the performance and life of the d evice. These user guidelin es are not tested. S torage T emperature .......
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 9 of 14 Cap acit ance T ested initially and after any design or proce ss chang es that may affect these parameters. [10 ] Parameter Description T est Conditions Max Unit C IN Input Capacitance T A = 25°C, f = 1 M H z , V CC = 3.
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 10 of 14 Switching Characteristics – 7 Option Over the Operating Range [2, 1 1] Parameter Description CY7B 991 1V -7 Unit Min T.
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 1 1 of 14 AC Timing Diagrams t ODCV t ODCV t REF REF FB Q OTHER Q INVERTED Q REF DIVIDED BY 2 REF DIVIDED BY 4 t RPWH t RPWL t PD.
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 12 of 14 Ordering Information Accuracy (ps) Ordering Code Package T ype Operating Range 500 CY7B991 1V -5JC 32-Pb Plasti c Leaded.
CY7B991 1V 3.3V RoboClock+™ Document Number: 38-0740 8 Rev . *D Page 13 of 14 Package Diagram Figure 10. 32-Pin Plastic Lead ed Chip Carrier J65 51-85002-* B [+] Feedback.
Document Number: 38-07408 Rev . *D Revised June 20, 2007 Page 14 of 14 PSoC Designer™, Programmable System-on-Chip ™, an d PS oC Exp re ss™ are tra demarks a nd PSo C® is a registe red t rade mark of Cypress S emi con ductor Corp.
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