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82801E датащи(PDF) 51 Page - Intel Corporation

номер детали 82801E
подробное описание детали  Intel 82801E Communications I/O Controller Hub (C-ICH)
PDF  84 Pages
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производитель  INTEL [Intel Corporation]
домашняя страница  http://www.intel.com
Logo INTEL - Intel Corporation

82801E датащи(HTML) 51 Page - Intel Corporation

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Intel® 82801E C-ICH
Advance Information Datasheet
51
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
1k
1 uF
5VREF
To System
To System
Schottky
Diode



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