Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz—Electrical Specifications
Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz
DS
January 2007
18
Order Number: 315876-002
3.5
Catastrophic Thermal Protection
The Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz supports the THERMTRIP# signal for
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
CC
supply to the processor
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
CC
,
V
SS
, or to any other signal (including each other) can result in component malfunction
or incompatibility with future processors. See
Table 15
for a pin listing of the processor
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
SS
). Unused outputs can be left
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
SS
. Please
refer to
Table 11
for details.
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
.
1
1
1
0
0
0
0.9125
1
1
1
0
0
1
0.9000
1
1
1
0
1
0
0.8875
1
1
1
0
1
1
0.8750
1
1
1
1
0
0
0.8625
1
1
1
1
0
1
0.8500
1
1
1
1
1
0
0.8375
1
1
1
1
1
1
0.8250
Table 3.
Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz VID Map (Sheet 3 of 3)
VID5
VID4
VID3
VID2
VID1
VID0
V
CC
(V)
Table 4.
BSEL[2:0] Encoding for BCLK Frequency
BSEL[2]
BSEL[1]
BSEL[0]
BCLK frequency
L
H
H
166 MHz
All other combinations
RESERVED
