80960KB datasheet(17/44 Pages) INTEL

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80960KB

Low inductance capacitors and interconnects are

recommended for best high frequency electrical

performance. Inductance is reduced by shortening

board traces between the processor and decoupling

capacitors as much as possible.

2.3

Connection Recommendations

For reliable operation, always connect unused inputs

to an appropriate signal level. In particular, if one or

more interrupt lines are not used, they should be

pulled up. No inputs should ever be left floating.

All open-drain outputs require a pullup device. While

in most cases a simple pullup resistor is adequate, a

network of pullup and pulldown resistors biased to a

valid VIH (>3.0 V) and terminated in the characteristic

impedance of the circuit board is recommended to

limit noise and AC power consumption. Figure 5 and

Figure 6 show recommended values for the resistor

network for low and high current drive, assuming a

characteristic impedance of 100

Ω. Terminating

output signals in this fashion limits signal swing and

reduces AC power consumption.

NOTE: Do not connect external logic to pins marked

N.C.

Figure 5. Connection Recommendations

for Low Current Drive Network

Figure 6. Connection Recommendations

for High Current Drive Network

2.4

Characteristic Curves

Figure 7 shows typical supply current requirements

over

the

operating

temperature

range

the

processor at supply voltage (VCC) of 5 V. Figure 8

and Figure 9 show the typical power supply current

(ICC) that the 80960KB requires at various operating

frequencies when measured at three input voltage

(VCC) levels and two temperatures.

For a given output current (IOL) the curve in Figure

10 shows the worst case output low voltage (VOL).

Figure 11 shows the typical capacitive derating

curve for the 80960KB measured from 1.5V on the

system clock (CLK) to 1.5V on the falling edge and

1.5V on the rising edge of the L-Bus address/data

(LAD) signals.

220

Ω

330

Ω

Low Drive Network:

VOH = 3.0 V

IOL = 20.7 mA

VCC

OPEN-DRAIN OUTPUT

180

Ω

390

Ω

High Drive Network:

VOH = 3.4 V

IOL = 25.3 mA

VCC

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