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®
Table 3.
Intel
Celeron
VID5
1
1
1
1
1
1
1
1
3.5
Catastrophic Thermal Protection
The Intel
catastrophic thermal protection. An external thermal sensor should also be used to
protect the processor and the system against excessive temperatures. Even with the
activation of THERMTRIP#, which halts all processor internal clocks and activity,
leakage current can be high enough such that the processor cannot be protected in all
conditions without the removal of power to the processor. If the external thermal
sensor detects a catastrophic processor temperature of approximately 125 °C
(maximum), or if the THERMTRIP# signal is asserted, the V
must be turned off within 500 ms to prevent permanent silicon damage due to thermal
runaway of the processor.
3.6
Signal Terminations and Unused Pins
All RSVD (RESERVED) pins must remain unconnected. Connection of these pins to V
V
, or to any other signal (including each other) can result in component malfunction
SS
or incompatibility with future processors. See
and the location of all RSVD pins.
For reliable operation, always connect unused inputs or bidirectional signals to an
appropriate signal level. Unused active low AGTL+ inputs may be left as no connects if
AGTL+ termination is provided on the processor silicon. Unused active high inputs
should be connected through a resistor to ground (V
unconnected.
Note:
The TEST1 and TEST2 pins have unique signal termination requirements. It is
mandatory that the TEST2 pin have a 51 Ω +/-5% pull down resistor to V
refer to
Table 11
3.7
FSB Frequency Select Signals (BSEL[2:0])
The BSEL[2:0] signals are used to select the frequency of the processor input clock
(BCLK[1:0]). The BSEL encoding for BCLK[1:0] is shown in
Table 4.
BSEL[2:0] Encoding for BCLK Frequency
BSEL[2]
L
All other combinations
®
®
Intel
Celeron
Processor 1.66 GHz/1.83 GHz
DS
18
®
Intel
Celeron
®
Processor 1.66 GHz/1.83 GHz VID Map (Sheet 3 of 3)
VID4
VID3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
®
®
Celeron
Processor 1.66 GHz/1.83 GHz supports the THERMTRIP# signal for
for details.
BSEL[1]
BSEL[0]
H
H
®
Processor 1.66 GHz/1.83 GHz—Electrical Specifications
VID2
VID1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
CC
Table 15
for a pin listing of the processor
). Unused outputs can be left
SS
Table
BCLK frequency
166 MHz
RESERVED
VID0
V
(V)
CC
0
0.9125
1
0.9000
0
0.8875
1
0.8750
0
0.8625
1
0.8500
0
0.8375
1
0.8250
supply to the processor
CC
. Please
SS
4.
January 2007
Order Number: 315876-002
,
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