Instruction/ maintenance manual of the product Rambus XDR CY24271 Cypress Semiconductor
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CY24272 Rambus ® XDR™ Clock Generator with Zero SDA Hold T ime Cypress Semiconductor Corpora tion • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600 Document Number: 001-42414 Rev .
CY24272 Document Number: 001-42414 Rev . ** Page 2 of 13 Pinout s T able 2. Pin Definition - 28 Pin TSSOP Pin No. Name IO Descriptio n 1 VDDP PWR 2.5V power supply fo r phased lock loop (PLL) 2 VSSP G.
CY24272 Document Number: 001-42414 Rev . ** Page 3 of 13 PLL Multiplier Ta b l e 3 shows the frequency multi pliers in the PLL, selectable by programming the SMBus registers MUL T0, MUL T1, and MUL T2.
CY24272 Document Number: 001-42414 Rev . ** Page 4 of 13 Device ID and SMBus Device Address The device ID (ID0 and ID1) is a part of the SMBus device 8-bit address. The least significa nt bi t of the ad dress designates a write or read operation. Ta b l e 4 o n page 3 shows the addresses for four CY24272 devices on the same SMBus.
CY24272 Document Number: 001-42414 Rev . ** Page 5 of 13 Note 5. RW = Read and W rite, RO = Read On ly , POD = Power on def ault . See T able 3 on page 3 f or PLL mul tip liers a nd T able 5 on p ag e 4 f or cl ock out put select ions.
CY24272 Document Number: 001-42414 Rev . ** Page 6 of 13 Figure 2. Differential and Single-Ended Clock Inpu t s Absolute Maximum Conditions Parameter Description Condition Min Max Unit V DD Clock Buffer Supply V oltage –0.5 4.6 V V DDC Core Supply V ol tage –0.
CY24272 Document Number: 001-42414 Rev . ** Page 7 of 13 DC Operating Conditions Parameter Description Condition Min Max Unit V DDP Supply V oltage for PLL 2.5V ± 5% 2.375 2.625 V V DDC Supply V oltage for Core 2.5V ± 5% 2.375 2.625 V V DD Supply V oltage for Clock Buf fers 2.
CY24272 Document Number: 001-42414 Rev . ** Page 8 of 13 AC Operating Conditions The AC operating cond itions follo w . [6] Parameter Description Condition Mi n Max Unit t CYCLE,IN REFCLK, REFCLKB inp.
CY24272 Document Number: 001-42414 Rev . ** Page 9 of 13 AC Electrical Specification The AC Electrical specifications follow . [6] Parameter Description Min Ty p Max Unit t CYCLE Clock Cycle time [19] 1.
CY24272 Document Number: 001-42414 Rev . ** Page 10 of 13 T est and Measurement Setup Figure 3. Clock Ou tput s Signal W aveforms A physical signal that appears at th e pins of a device is deemed valid or invalid depe nding on its voltage and timing relations with other signals.
CY24272 Document Number: 001-42414 Rev . ** Page 1 1 of 13 Figure 4. Input and Output Waveforms Figure 5. Cros sing Point V olta ge Figure 6. Cycle-to-cycle Jitter Figure 7.
CY24272 Document Number: 001-42414 Rev . ** Page 12 of 13 Package Drawing and Dimension Figure 8. 28-Pin Thin Shrunk Small Outline Package (4.40-mm Body) ZZ28 Ordering Information Part Number Package .
Document Number: 001-42414 Rev . ** Revi sed November 9, 2007 Page 13 of 13 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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