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LGA 771 Socket Mechanical Design Guide 19
Electrical Requirements
4 Electrical Requirements
Table 4-1 provides 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
inductance, Loop
1.17 mm:
<3.9 nH
The inductance calculated for two contacts, considering one
forward conductor and one return conductor. These values
must be satisfied at the worst-case height of the socket.
2 Mated partial mutual
inductance, L
NA The inductance on a conductor due to any single neighboring
conductor.
3 Maximum mutual
capacitance, C
<1 pF The capacitance between two pins/connectors.
4Socket Average
Contact Resistance
(EOL)
≤ 15.2 mΩ This value has to be satisfied at all times.
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.
5 Max Chain Contact
Resistance (EOL)
≤ 28 mΩ This value has to be satisfied at all times.
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
Increase
≤ 3 mΩ The bulk resistance increase per contact from 24°C to 100°C
7 Dielectric Withstand
Voltage
360 Volts
RMS
8 Insulation Resistance 800 MΩ