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FW82371AB View Datasheet(PDF) - Intel

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FW82371AB Datasheet PDF : 284 Pages
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E
82371AB (PIIX4)
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
1µF
To System
VREF
To System
Figure 2. Example VCC5REF Sequencing Circuit
Pix4_01
PRELIMINARY
41
4/9/97 2:23 PM PIIX4aDS
INTEL CONFIDENTIAL
(until publication date)
 

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