Intel Celeron D Processor 3xx Sequence

Datasheet 17
Electrical Specifications
2.4 Voltage Identification
The VID specification for the Celeron D processor is supported by the applicable VRD design
guide. The voltage set by the VID pins is the maximum voltage allowed by the processor. A
minimum voltage is provided in Table 2-8 and changes with frequency. This allows processors
running at a higher frequency to have a relaxed minimum voltage specification. The specifications
have been set such that one voltage regulator can work with all supported frequencies.
Individual processor VID values may be calibrated during manufacturing such that two devices at
the same speed may have different VID settings.
The Celeron D processor uses six voltage identification pins, VID[5:0], to support automatic
selection of power supply voltages. Table 2-2 specifies the voltage level corresponding to the state
of VID[5:0]. A ‘1’ in this table refers to a high voltage level and a ‘0’ refers to low voltage level. If
the processor socket is empty (VID[5:0] = x11111), or the voltage regulation circuit cannot supply
the voltage that is requested, it must disable itself. See the applicable VRD design guide for more
details.
Power source characteristics must be guaranteed to be stable whenever the supply to the voltage
regulator is stable.
The Celeron D processor’s Voltage Identification circuit requires an independent 1.2 V supply and
some other power sequencing considerations.
Table 2-2. Voltage Identification Definition
VID5 VID4 VID3 VID2 VID1 VID0 VID VID5 VID4 VID3 VID2 VID1 VID0 VID
1010010.850 1110011.225
1010000.875 1110001.250
1001110.900 1101111.275
1001100.925 1101101.300
1001010.950 1101011.325
1001000.975 1101001.350
1000111.000 1100111.375
1000101.025 1100101.400
1000011.050 1100011.425
1000001.075 1100001.450
111111
VR output
off
1011111.475
1111101.100 1011101.500
1111011.125 1011011.525
1111001.150 1011001.550
1110111.175 1010111.575
1110101.200 1010101.600