AMD ATHLON 8 - Manual (Page 49)

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
re p re s e n t s C L K I N # a n d R S T C L K # t i e d t o g e t h e r. Fo r
information about SYSCLK and SYSCLK#, see “SYSCLK and
S Y S C L K # ” o n p a g e 7 9 a n d Ta b l e 2 4 , “ P i n N a m e
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