CY2254A Cypress Semiconductor, CY2254A Datasheet
CY2254A
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CY2254A Summary of contents
Page 1
... V/ns slew rate requirement of a Pentium proces- sor-based system. The CY2254A accepts a 14.318 MHz reference signal as its input. The CY2254A has 2 PLLs, one of which generates the CPU and PCI clocks, and the other generates the I/O and Key- board Controller or USB clocks. The CY2254A runs off either a 3 ...
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... CPUCLK PCICLK Output High-Z High-Z 25.0 MHz 14.318 MHz 24 MHz 30.0 MHz 14.318 MHz 24 MHz 33.33 MHz 14.318 MHz 24 MHz TCLK/2 TCLK/4 TCLK 27.5 MHz 14.318 MHz 24 MHz = 17 pF. LOAD www.DataSheet4U.com CY2254A ) KBDCLK USBCLK IOCLK 1 only 2 only High-Z High-Z High-Z 12 MHz 48 MHz 12 MHz 48 MHz ...
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... 5. Three-state V = 3.6V 5.5V www.DataSheet4U.com CY2254A 0.5 to +7.0V 0. +150 C Min. Max. 3.135 3.6 4.5 5 14.318 14.318 0.05 50 Min. Max. 2.0 0.8 CPUCLK 2.4 PCICLK, REF0 KBDCLK, USBCLK REF1 CPUCLK 0 ...
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... Measured between 2.4 and 0.4V CPU-CPU Clock Skew Measured at 1.5V PCI-PCI Clock Skew Measured at 1.5V CPU-PCI Skew Measured at 1. option) Measured at 1. option) Cycle-Cycle Clock Jitter CPU Clock Jitter 1B 1.5V 3.3V 2.4V 0. www.DataSheet4U.com CY2254A Min. Description Min Max. Unit Max. Unit 55% V/ ...
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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 www.DataSheet4U.com 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 ...
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... The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges. 28-Lead (300-Mil) Molded SOIC S21 www.DataSheet4U.com CY2254A 51-85026-A Page ...
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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 Power up requirements added to Operating Conditions Information www.DataSheet4U.com CY2254A Description of Change ...