Intel SL2YM Datasheet download pdf (Page 72)

Pentium

II Processor at 350 MHz, 400 MHz, and 450 MHz

72 Datasheet

6.3 Boxed Processor Requirements

6.3.1 Fan Heatsink Power Supply

The boxed processor's fan heatsink requires a +12 V power supply. A fan power cable will be

shipped with the boxed processor to draw power from a power header on the motherboard. The

power cable connector and pinout are shown in Figure 47. Motherboards must provide a matched

power header to support the boxed processor. Table 39 contains specifications for the input and

output signals at the fan heatsink connector. The cable length will be 7.0 ±0.25 inches. 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 V

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 itself. Figure 48 shows the location of the fan power

connector relative to the 242-contact slot connector. The motherboard power header should be

positioned within 4.75 inches (lateral) of the fan power connector.

Figure 47. Boxed Processor Fan Heatsink Power Cable Connector Description

Table 39. Fan Heatsink Power and Signal Specifications

Descri

tion Min T

Max

+12 V: 12 volt fan power supply 9 V 12 V 13.8 V

: Fan current draw 100 mA

SENSE: SENSE frequency (motherboard should pull this pin

up to appropriate V

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.

GND

+12V

SENSE

000888

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Intel SL2YM Datasheet Page 72

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