CY2254ASC-1 Cypress Semiconductor Corporation., CY2254ASC-1 Datasheet
CY2254ASC-1
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CY2254ASC-1 Summary of contents
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Features • Multiple clock outputs to meet requirements of most Pentium ® motherboards — Four pin-selectable CPU clocks @ 66.66 MHz, 60.0 MHz, and 50.0 MHz for support of Intel Triton based PC — 55.0 MHz pin-selectable CPU clock ...
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Pin Summary Name [1] XTALIN 2 [1] XTALOUT CPUCLK0 6 CPUCLK1 CPUCLK2 9 CPUCLK3 PCICLK0 ...
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PCI Clock Driver Strength Requirements • Matched impedances on both rising and falling edges on the output drivers • Output impedance: 25 (typical) measured at 1.5V • Maximum output impedance: 40 measured at 1.5V CPU Clock Driver Strength Requirements • ...
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Electrical Characteristics V DD Parameter Description Notes: 3. Electrical parameters are guaranteed with these operating conditions. 4. Guaranteed by design, not tested. [5] Switching Characteristics Parameter Output t All 1 [4] t CPUCLK, PCICLK 2 [4] t REF, KBDCLK, USBCLK ...
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Switching Waveforms (continued) Clock Skew 1.5V CPUCLK/ 1.5V PCICLK Notes: 5. All parameters specified with outputs fully loaded. 6. Duty cycle is measured at 1.5V. Document #: 38-07203 Rev. *A CY2254A Page ...
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... Switching Waveforms (continued) CPU-PCI Clock Skew CPUCLK 1.5V 1.5V PCICLK t 7 Test Circuit V DD Note: All capacitors should be placed as close to each pin as possible. Ordering Information Package Ordering Code Name CY2254ASC 1 S21 CY2254ASC 2 S21 Document #: 38-07203 Rev 0 0 OUTPUTS C ...
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Package Diagram Document #: 38-07203 Rev. *A © Cypress Semiconductor Corporation, 2001. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a ...
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Document Title: CY2254A Pentium Document Number: 38-07203 Issue REV. ECN NO. Date ** 111723 12/15/01 *A 121838 12/14/02 Document #: 38-07203 Rev. *A ® Processor Compatible Clock Synthesizer/Driver Orig. of Change DSG Change from Spec number: 38-00504 to 38-07203 RBI ...