Electrical Specifications
2. Listed frequencies are not necessarily committed production frequencies.
The Mobile Intel Pentium 4 Processor-M uses a differential clocking implementation. For more
information on Mobile Intel Pentium 4 Processor-M clocking.
2.4
Voltage Identification and Power Sequencing
The voltage set by the VID pins is the nominal/typical voltage setting for the processor. A
minimum voltage is provided in Table 7 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.
The Mobile Intel Pentium 4 Processor-M uses five voltage identification pins, VID[4:0], to support
automatic selection of power supply voltages. The VID pins for the Mobile Intel Pentium 4
Processor-M are open drain outputs driven by the processor VID circuitry. Table 3 specifies the
voltage level corresponding to the state of VID[4:0]. A “1” in this table refers to a high-voltage
level and a “0” refers to low-voltage level.
Power source characteristics must be stable whenever the supply to the voltage regulator is stable.
Refer to the Figure 16 for timing details of the power up sequence. Also refer to Mobile Intel
Pentium 4 Processor-M and Intel 845MP/845MZ Chipset Platform Design Guide for
implementation details.
Mobile Intel Pentium 4 Processor-M’s Voltage Identification circuit requires an independent 1.2-V
supply. This voltage must be routed to the processor VCCVID pin. Figure 1 shows the voltage and
current requirements of the VCCVID pin.
Figure 1. VCCVID Pin Voltage and Current Requirements
1.2V+10%
1.2V-5%
1V
150mA to 300mA
80mA
30mA
1mA
70nS
5nS
Mobile Intel Pentium 4 Processor-M Datasheet
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INTEL [ INTEL ]
