AMD-K6-2ESLASH233AMZ datasheet(280/332 Pages) AMD

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Electrical Data

Chapter 14

AMD-K6™-2E Processor Data Sheet

22529B/0—January 2000

Preliminary Information

14.6

Power and Grounding

Power Connections

The AMD-K6-2E processor is a dual voltage device. Two

separate supply voltages are required: VCC2 and VCC3.

VCC2 provides the core voltage for the processor.

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-K6-2E

processor. (See Chapter 17, “Pin Designation Diagrams” on

page 299 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 0.254 mm if they are in the same layer of the circuit board.

(See Figure 88 on page 263.) To maintain low-impedance

current sink and reference, the ground plane must never be

split.

Although the AMD-K6-2E 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.

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