Intel 80960KB User Manual

80960KB
11
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 V
IH
(>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 of the
processor at supply voltage (V
CC
) of 5 V. Figure 8
and Figure 9 show the typical power supply current
(I
CC
) that the 80960KB requires at various operating
frequencies when measured at three input voltage
(V
CC
) levels and two temperatures.
For a given output current (I
OL
) the curve in Figure
10 shows the worst case output low voltage (V
OL
).
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:
V
OH
= 3.0 V
I
OL
= 20.7 mA
V
CC
OPEN-DRAIN OUTPUT
OPEN-DRAIN OUTPUT
180 Ω
390 Ω
High Drive Network:
V
OH
= 3.4 V
I
OL
= 25.3 mA
V
CC

Intel 80960KB Specifications

General

Brand	Intel
Model	80960KB
Category	Computer Hardware
Language	English