AMD-K6-2E/400AFR AMD [Advanced Micro Devices], AMD-K6-2E/400AFR Datasheet - Page 280

• Manufacturer Part Number: AMD-K6-2E/400AFR
• Manufacturer: AMD [Advanced Micro Devices]

AMD-K6™-2E Processor Data Sheet
14.6
Power Connections
262
Power and Grounding
The AMD-K6-2E processor is a dual voltage device. Two
separate supply voltages are required: V
See “Electrical Data” on page 253 for the value and range of
V
There are 28 V
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 V
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 V
and V
CC2
VCC2 provides the core voltage for the processor.
VCC3 provides the I/O voltage.
and V
CC3
Preliminary Information
are either both on or both off.
CC3
CC2
.
Electrical Data
, 32 V
CC3
, and 68 V
SS
pins on the AMD-K6-2E
CC2
and V
CC2
22529B/0—January 2000
, V
CC3
CC3
.
, and V
Chapter 14
CC2
SS