Intel LGA 771 manual LGA771 Socket Electrical Requirements, Criteria Size

Electrical Requirements

4Electrical Requirements

Table 4-1provides the LGA771 Socket electrical requirements.

Socket electrical requirements are measured from the socket-seating plane of the processor to the component side of the PCB to which it is attached. All specifications are maximum values (unless otherwise stated) for a single socket contact, but includes effects of adjacent contacts where indicated.

Table 4-1.	LGA771 Socket Electrical Requirements
	No	Criteria	Size	Notes
	*1	Mated loop	1.17 mm:	The inductance calculated for two contacts, considering one
		inductance, Loop	<3.9 nH	forward conductor and one return conductor. These values
				must be satisfied at the worst-case height of the socket.
	2	Mated partial mutual	NA	The inductance on a conductor due to any single neighboring
		inductance, L		conductor.
	3	Maximum mutual	<1 pF	The capacitance between two pins/connectors.
		capacitance, C
	4	Socket Average	≤ 15.2 mΩ	This value has to be satisfied at all times.
		Contact Resistance		The specification listed is at room temperature.
		(EOL)
				The socket average resistance target is derived from average
				of every chain contact resistance, with a chain contact
				resistance defined as the resistance of each chain minus
				resistance of shorting bars divided by number of lands in the
				daisy chain.
				Socket Contact Resistance: The resistance of the socket
				contact, including the interface resistance to the package land.
	5	Max Chain Contact	≤ 28 mΩ	This value has to be satisfied at all times.
		Resistance (EOL)		The specification listed is at room temperature.
				The socket average resistance target is derived from average
				of every chain contact resistance, with a chain contact
				resistance defined as the resistance of each chain minus
				resistance of shorting bars divided by number of lands in the
				daisy chain.
				Socket Contact Resistance: The resistance of the socket
				contact, including the interface resistance to the package land.
	6	Bulk Resistance	≤ 3 mΩ	The bulk resistance increase per contact from 24°C to 100°C
		Increase
	7	Dielectric Withstand	360 Volts
		Voltage	RMS
	8	Insulation Resistance	800 MΩ

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LGA 771 Socket Mechanical Design Guide 19