Guide

Intel® Xeon® Processor E7 2800/4800/8800 v2 Product Family 81
Thermal/ Mechanical Specifications and Design Guide
LGA2011-1 Socket Electrical
E LGA2011-1 Socket Electrical
E.1 Socket Electrical Requirements
LGA2011-1 electrical requirements (see Table E-1) are measured from the socket-
seating plane of the processor (end of the contacts) to the socket solder ball attach at
the motherboard. All specifications are maximum values (unless otherwise stated) for a
single socket contact, but includes effects of adjacent contacts where indicated. Socket
inductance includes exposed metal from mated contact to the PCB land array.
Table E-1. LGA2011-1 Electrical Requirements (Sheet 1 of 2)
Parameter Value Notes
S-parameters See Table E-3
Measurements/simulations conditions:
1. Termination impedance: 85-Ohm differential,
50-Ohm single ended
2. Maximum test frequency: 10 GHz
3. Measurement structure consists of pin / pins under
test surrounded by ground pins. For crosstalk, two
pins or pin pairs are immediately adjacent to one
another and the entire structure is surrounded by
ground pins. Appropriate de-embedding is used to
isolate the characteristics of the pin(s) under test, but
the measurement result does include the effect of the
test package via.
Mated loop inductance, Loop <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. Test frequency is
1GHz.
Socket Average Contact
Resistance (EOL)
22 milli-Ohms
The socket maximum average contact resistance
target is calculated from the following equation:
sum(Ni X LLCRi) / sum(Ni)
LLCRi is the chain resistance defined as the resistance
of each chain minus resistance of shorting bars divided
by number of lands in the daisy chain.
Ni is the number of contacts within a chain.
i is the number of daisy chains, ranging from 1 to 119
(total number of daisy chains).
The specification listed is at room temperature and
has to be satisfied at all time.
Max Chain Resistance (EOL)
Refer to Table E-2
for criterion for
varying chain
length
The chain resistance is derived from the resistance of
each chain minus resistance of shorting bars divided
by number of lands in the daisy chain, and shall not
exceed the Max Chain Resistance target.
The Max Chain Resistance is defined by assuming only
one contact reaches a maximum of 97 milli-Ohms and
the rest meet the Socket Average Contact Resistance.
It is calculated from the following equation:
((Ni-1) X Socket Average Contact Resistance + 97)/Ni;
where Ni is the number of contacts within a chain.
The specification listed is at room temperature and
has to be satisfied at all time.
Bulk Resistance Increase
≤3 milli-Ohms
The bulk resistance increase per contact from 25°C to
100°C