AMD K5 Manual do Utilizador descarregar pdf (Página 66)

AMD-K5 Processor Data Sheet 18522F/0—Jan1997

PRELIMINARY INFORMATION

9 Electrical Data

9.1 Power and Grounding

Power Connections The AMD-K5 processor includes 53 V

and 53 V

pins for

clean, on-chip power distribution at high frequencies. Power

and ground connections must be made to all external V

and

GND pins, respectively. All V

pins must be connected to the

circuit board V

plane, and all V

pins must be connected to

the circuit board GND plane. Table 14 on page 58 provides the

DC characteristics of the processor.

Connection

Recommendations

■ Emphasize decoupling capacitance near the AMD-K5

processor

■ Driving address and data buses into large capacitive loads

at high frequencies can cause transient power surges

■ Low inductance capacitors and circuit paths provide the

best performance at high frequencies

■ Inductance can be reduced by shortening circuit board

paths as much as possible

■ Capacitors specifically for PGA packaging are commer-

cially available

■ NC pins shall be unconnected

■ Always connect unused inputs to an appropriate signal

level

■ Unused active Low inputs should be connected to V

through a pull-up resistor

■ Pull-up resistors of 20 kΩ should be used

■ Unused active High inputs should be connected to GND

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AMD K5 Manual do Utilizador Página 66