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Chapter 8 Electrical Data 37
25175H—March 2003 AMD Athlon™ XP Processor Model 8 Data Sheet
Preliminary Information
8.9 SYSCLK and SYSCLK# DC Characteristics
Table 14 shows the DC characteristics of the SYSCLK and
SYSCLK# differential clocks. The SYSCLK signal represents
CLKIN and RSTCLK tied together while the SYSCLK# signal
represents CLKIN# and RSTCLK# tied together. For
information about SYSCLK and SYSCLK#, see “SYSCLK and
SYSCLK#” on page 79 and Table 24, “Pin Name
Abbreviations,” on page 58.
Figure 11 shows the DC characteristics of the SYSCLK and
SYSCLK# signals.
Figure 11. SYSCLK and SYSCLK# Differential Clock Signals
Table 14. SYSCLK and SYSCLK# DC Characteristics
Symbol Description Min Max Units
V
Threshold-DC
Crossing before transition is detected (DC) 400 mV
V
Threshold-AC
Crossing before transition is detected (AC) 450 mV
I
LEAK_P
Leakage current through P-channel pullup to V
CC_CORE
–1 mA
I
LEAK_N
Leakage current through N-channel pulldown to VSS (Ground) 1 mA
V
CROSS
Differential signal crossover
V
CC_CORE
/ 2±100
mV
C
PIN
Capacitance * 4 25 * pF
Note:
* The following processor inputs have twice the listed capacitance because they connect to two input pads—SYSCLK and SYSCLK#.
SYSCLK connects to CLKIN/RSTCLK. SYSCLK# connects to CLKIN#/RSTCLK#.
V
CROSS
V
Threshold-DC
= 400mV V
Threshold-AC
= 450mV