82801E datasheet(51/84 Pages) INTEL

tên linh kiện	82801E

Giải thích chi tiết về linh kiện	Intel 82801E Communications I/O Controller Hub (C-ICH)

PDF	84 Pages

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nhà sản xuất	INTEL [Intel Corporation]

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Intel® 82801E C-ICH

Advance Information Datasheet

3.3.4

V5REF/Vcc3_3 Sequencing Requirements

V5REF is the reference voltage for 5 V tolerance on inputs to the 82801E C-ICH. V5REF must

power up before or simultaneous to Vcc3_3, and must power down after or simultaneous to

Vcc3_3. Refer to Figure 8 for an example circuit schematic that may be used to ensure proper

V5REF sequencing.

3.4

Power Planes and Pin States

3.4.1

Power Planes

Figure 8. Example V5REF Sequencing Circuit

Table 29. 82801E C-ICH Power Planes

Plane

Description

Main I/O

(3.3 V)

Vcc3_3: Powered by the main power supply.

Main Logic

(1.8 V)

Vcc1_8: Powered by the main power supply.

Processor Interface

(1.3 ~ 2.5 V)

V_CPU_IO: Powered by the main power supply via processor voltage regulator.

RTC

VccRTC: When other power is available (from the main supply), external diode

coupling will provide power to reduce the drain on the RTC battery. Assumed to operate

from 3.3 V down to 2.0 V.

VCC Supply

(3.3V)

5V Supply

1 uF

5VREF

To System

Schottky

Diode

82801E bảng dữ liệu(PDF) 51 Page - Intel Corporation