cy2256 Cypress Semiconductor Corporation., cy2256 Datasheet
cy2256
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cy2256 Summary of contents
Page 1
... Pentium processor-based system. The CY2256 accepts a 14.318 MHz reference crystal or clock as its input. The CY2256 has two PLLs, one of which gener- ates the CPU clocks, and the other generates the PCI clocks. The CY2256 runs off a 3.3V or 5.0V supply. ...
Page 2
... MHz 30.0 MHz 60.0 MHz 60.0 MHz 33.33 MHz 66.66 MHz 66.66 MHz 33.33 MHz 75.0 MHz 75.0 MHz 33.33 MHz 66.66 MHz High-Z 33.33 MHz High-Z High-Z High pF. LOAD 2 CY2256 ) Ref. Clock Output PCI Mode 14.318 MHz Synch. 14.318 MHz Asynch. 14.318 MHz Synch. 14.318 MHz Asynch. 14.318 MHz Synch. ...
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... Min Three-state V = 3.6V CY2256 +0.5 DD Min. Max. Unit 3.135 3 14.318 14.318 MHz Min. Max. Unit 2.0 0.8 CPUCLKA/B 2.4 PCICLK REF0 REF1 CPUCLKA/B 0.4 PCICLK ...
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... Measured between 0.4V and 2.4V Measured between 0.4V and 2.4V Measured between 2.4V and 0.4V Measured between 0.4V and 2.4V Measured between 0.4V and 2.4V Measured at 1.5V Measured at 1.5V [7] Measured at 1.5V [7] CPU Clock jitter CPU clock stabilization from power-up PCI clock stabilization from power-up 1.5V 2256–3 4 CY2256 Min. Max. Unit 45% 55% 5.0 ns 12.0 ns 5 4.0 V/ns 0.5 2 ...
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... Switching Waveforms (continued) All Outputs Rise/Fall Time t 1C 2.4V 2.4V OUTPUT 0. Clock Skew 1.5V CPUCLK or 1.5V PCICLK CPU–PCI Clock Skew CPUCLK 1.5V 1.5V PCICLK t 7 3.3V 0.4V 0. 2256– 2256–5 2256–6 5 CY2256 ...
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... V DD 0.1 F 0.1 F Note: All capacitors should be placed as close to each pin as possible. Ordering Information Package Ordering Code Name CY2256SC-1 S21 28-Pin SOIC CY2256PVC-1 O28 28-Pin SSOP Document #: 38-00515 OUTPUTS C LOAD Operating Package Type Range Commercial Commercial 6 CY2256 0.1 F 0.1 F ...
Page 7
... 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 28-Lead Shrunk Small Outline Package O28 CY2256 ...