AMD ATHLON 8 - Manual (Page 56)

44 Electrical Data Chapter 8
AMD Athlon™ XP Processor Model 8 Data Sheet 25175H—March 2003
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 Parameter Description Max Units Notes
T
SHUTDOWN
Thermal diode shutdown temperature for processor protection 125
°C
1, 2, 3
T
SD_DELAY
Maximum allowed time from T
SHUTDOWN
detection to processor shutdown 500 ms 1, 3
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.
Table 19. APIC Pin AC and DC Characteristics
Symbol Parameter Description Condition Min Max Units Notes
V
IH
Input High Voltage 1.7 2.625 V 1, 2
V
IL
Input Low Voltage –300 700 mV 1
V
OH
Output High Voltage 2.625 V 2
V
OL
Output Low Voltage –300 400 mV
I
LEAK_P
Tristate Leakage Pullup V
IN
= VSS (Ground) –1 mA
I
LEAK_N
Tristate Leakage Pulldown V
IN
= 2.5 V 1 mA
I
OL
Output Low Current V
OL
Max 9 mA
T
RISE
Signal Rise Time 1.0 3.0 V/ns 3
T
FALL
Signal Fall Time 1.0 3.0 V/ns 3
T
SU
Setup Time 1 ns
T
HD
Hold Time 1 ns
C
PIN
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.