AMD AMD-K6-2/500AFX Data Sheet - Page 269
Power and Grounding, 13.1 Power Connections
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21850J/0-February 2000 Preliminary Information AMD-K6®-2 Processor Data Sheet 13 Power and Grounding 13.1 Power Connections The AMD-K6-2 processor is a dual voltage device. Two separate supply voltages are required: VCC2 and VCC3. VCC2 provides the core voltage for the processor and VCC3 provides the I/O voltage. See "Electrical Data" on page 253 for the value and range of VCC2 and VCC3. There are 28 VCC2, 32 VCC3, and 68 VSS pins on the AMD-K6-2 processor. (See "Pin Designations" on page 297 for all power and ground pin designations.) The large number of power and ground pins are provided to ensure that the processor and package maintain a clean and stable power distribution network. For proper operation and functionality, all VCC2, VCC3, and VSS pins must be connected to the appropriate planes in the circuit board. The power planes have been arranged in a pattern to simplify routing and minimize crosstalk on the circuit board. The isolation region between two voltage planes must be at least 0.254mm if they are in the same layer of the circuit board. (See Figure 92 on page 250.) In order to maintain a low-impedance current sink and reference, the ground plane must never be split. Although the AMD-K6-2 processor has two separate supply voltages, there are no special power sequencing requirements. The best procedure is to minimize the time between which VCC2 and VCC3 are either both on or both off. Chapter 13 Power and Grounding 249