AMD-K6-2E Datasheet, PDF (280/332 Pages) Advanced Micro Devices – AMD-K6™-2E Embedded Processor

AMD-K6™-2E Processor Data Sheet
Preliminary Information
22529B/0—January 2000
14.6
Power and Grounding
Power Connections
The AMD-K6-2E processor is a dual voltage device. Two
separate supply voltages are required: V_CC2 and V_CC3.
s VCC2 provides the core voltage for the processor.
s VCC3 provides the I/O voltage.
See “Electrical Data” on page 253 for the value and range of
V_CC2 and V_CC3.
There are 28 V_CC2, 32 V_CC3, and 68 V_SS 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 V_CC2, V_CC3, and V_SS
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_CC2
and V_CC3 are either both on or both off.
262
Electrical Data
Chapter 14