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44
Electrical Data
Chapter 8
AMD Athlon XP Processor Model 8 Data Sheet
25175E—November 2002
Preliminary Information
8.14
APIC Pins AC and DC Characteristics
Table 19 shows the AMD Athlon XP processor model 8 AC and
DC characteristics of the APIC pins.
Table 18. Guidelines for Platform Thermal Protection of the Processor
Symbol
T
SHUTDOWN
T
SD_DELAY
Notes:
1. The thermal diode is not 100% tested, it is specified by design and limited characterization.
2. The thermal diode is capable of responding to thermal events of 40°C/s or faster.
3. The AMD Athlon XP processor model 8 provides a thermal diode for measuring die temperature of the processor. The
processor relies on thermal circuitry on the motherboard to turn off the regulated core voltage to the processor in response to a
thermal shutdown event. Refer to
AMD Athlon Processor-Based Motherboard Design Guide
, order# 24363, for thermal
protection circuitry designs.
Parameter Description
Max
125
Units
°
C
Notes
1, 2, 3
Thermal diode shutdown temperature for processor protection
Maximum allowed time from T
SHUTDOWN
detection to processor shutdown
500
ms
1, 3
Table 19. APIC Pin AC and DC Characteristics
Symbol
Parameter Description
Input High Voltage
Condition
Min
1.7
Max
2.625
Units
V
Notes
1, 2
V
IH
V
IL
V
OH
V
OL
I
LEAK_P
I
LEAK_N
I
OL
T
RISE
T
FALL
T
SU
T
HD
C
PIN
Input Low Voltage
–300
700
mV
1
Output High Voltage
2.625
V
2
Output Low Voltage
–300
400
mV
Tristate Leakage Pullup
V
IN
= VSS (Ground)
V
IN
= 2.5 V
V
OL
Max
–1
mA
Tristate Leakage Pulldown
1
mA
Output Low Current
9
mA
Signal Rise Time
1.0
3.0
V/ns
3
Signal Fall Time
1.0
3.0
V/ns
3
Setup Time
1
ns
Hold Time
1
ns
Pin Capacitance
4
12
pF
Notes:
1. Characterized across DC supply voltage range.
2. The 2.625-V value is equal to 2.5 V plus a maximum of five percent.
3. Edge rates indicate the range for characterizing the inputs.