AMD AX1800DMT3C - Athlon XP 1.53 GHz Processor, Datasheet, Page: 46 / 94

34 Electrical Data Chapter 7
AMD Athlon™ XP Processor Model 6 Data Sheet
24309E—March 2002
Preliminary Information
7.11 AMD Athlon™ System Bus AC and DC Characteristics
Table 11 shows the DC characteristics of the AMD Athlon
system bus used by the AMD Athlon XP processor model 6.
Table 11. AMD Athlon™ System Bus DC Characteristics
Symbol Parameter Condition Min Max Units Notes
V
REF
DC Input Reference Voltage
(0.5*VCC_CORE)
–50
(0.5*VCC_CORE)
+50
mV 1
I
VREF_LEAK_P
V
REF
Tristate Leakage Pullup V
IN
= V
REF
Nominal
–100
µ
A
I
VREF_LEAK_N
V
REF
Tristate Leakage Pulldown V
IN
= V
REF
Nominal
100
µ
A
V
IH
Input High Voltage
V
REF
+ 200
VC
500
mV
V
IL
Input Low Voltage –500
V
REF
– 200
mV
V
OH
Output High Voltage
I
OUT
= –200
µ
A
0.85 VCC_CORE V500 mV 2
V
OL
Output Low Voltage
I
OUT
= 1 mA
–500 400 mV 2
I
LEAK_P
Tristate Leakage Pullup
V
IN
= VSS (Ground)
–1 mA
I
LEAK_N
Tristate Leakage Pulldown
V
IN
= VCC_CORE
Nominal
1 mA
C
IN
Input Pin Capacitance 4 12 pF
Notes:
1. V
REF
is nominally set to 50% of VCC_CORE with actual values that are specific to motherboard design implementation. V
REF
must be
created with a sufficiently accurate DC source and a sufficiently quiet AC response to adhere to the ± 50 mV specification listed above.
2. Specified at the T
D I E
an d V C C _ C O R E s pe ci f i ca ti o ns i n t hi s do cu m e n t.