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82371AB Datasheet(PDF) 41 Page - Intel Corporation |
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82371AB Datasheet(HTML) 41 Page - Intel Corporation |
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41 / 284 page  82371AB (PIIX4) 41 4/9/97 2:23 PM PIIX4aDS INTEL CONFIDENTIAL (until publication date) PRELIMINARY 2.3. Power Sequencing Requirements There are no power sequencing requirements for the various VCC power supplies to PIIX4. The VREF signal must be tied to 5V in a system requiring 5V tolerance. In a 5V tolerant system, this signal must power up before or simultaneous to VCC. It must power down after or simultaneous to VCC. In a non-5V tolerant system (3.3V only), this signal can be tied directly to VCC. There are then no sequencing requirements. Refer to Figure 2 for an example circuit schematic that may be used to ensure the proper VREF sequencing. Vcc Supply (3.3V) 5V Supply 1k Ω 1µF To System VREF To System Pix4_01 Figure 2. Example VCC5REF Sequencing Circuit |
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