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參數資料
| 型號： | pentium III |
| 廠商： | Intel Corp. |
| 英文描述： | pentium III Processor for the PGA370 Socket at 500MHz to 933MHz(工作頻率500到933兆赫茲活動帶PGA370插孔奔III處理器) |
| 中文描述： | 奔騰III處理器在500MHz到933MHz的（工作頻率500到933兆赫茲活動帶PGA370插孔奔三處理器的PGA370插座） |
| 文件頁數： | 65/78頁 |
| 文件大小： | 610K |
| 代理商： | PENTIUM III |
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Datasheet
65
Pentium
III Processor for the PGA370 Socket at 500 MHz to 933 MHz
6.2
Boxed Processor Requirements
6.2.1
Fan Heatsink Power Supply
The boxed processor's fan heatsink requires a +12 V power supply. A fan power cable is attached
to the fan and will draw power from a power header on the motherboard. The power cable
connector and pinout are shown in
Figure 27
. Motherboards must provide a matched power header
to support the boxed processor.
Table 32
contains specifications for the input and output signals at
the fan heatsink connector. The cable length is 7.0 inches (±0.25"). The fan heatsink outputs a
SENSE signal, which is an open-collector output, that pulses at a rate of two pulses per fan
revolution. A motherboard pull-up resistor provides VOH to match the motherboard-mounted fan
speed monitor requirements, if applicable. Use of the SENSE signal is optional. If the SENSE
signal is not used, pin 3 of the connector should be tied to GND.
The power header on the baseboard must be positioned to allow the fan heatsink power cable to
reach it. The power header identification and location should be documented in the motherboard
documentation or on the motherboard.
Figure 28
shows the recommended location of the fan
power connector relative to the PGA370 socket. The motherboard power header should be
positioned within 4.00 inches from the center of the PGA370 socket.
Figure 27. Boxed Processor Fan Heatsink Power Cable Connector Description
Table 32. Fan Heatsink Power and Signal Specifications
Description
Min
Typ
Max
+12 V: 12 volt fan power supply
7 V
12 V
13.8 V
IC: Fan current draw
100 mA
SENSE: SENSE frequency (motherboard should pull this
pin up to appropriate V
CC
with resistor)
2 pulses per
fan revolution
Pin
Signal
Straight square pin, 3-pin terminal housing with
polarizing ribs and friction locking ramp.
0.100" pin pitch, 0.025" square pin width.
Waldom/Molex P/N 22-01-3037 or equivalent.
Match with straight pin, friction lock header on motherboard
Waldom/Molex P/N 22-23-2031, AMP P/N 640456-3,
or equivalent.
1
2
3
GND
+12V
SENSE
1
2
3
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