DC & Switching Characteristics
Table 6–18. PCI-X Specifications (Part 2 of 2)
Symbol
Parameter
Conditions
Minimum Typical Maximum Units
VIPU
Input pull-up voltage
0.7 ×
VCCIO
V
V
V
VOH
VOL
High-level output voltage
Low-level output voltage
IOUT = –500 μA
IOUT = 1,500 μA
0.9 ×
VCCIO
0.1 ×
VCCIO
Table 6–19. GTL+ I/O Specifications
Symbol
Parameter
Termination voltage
Reference voltage
Conditions
Minimum Typical Maximum Units
VTT
1.35
1.5
1.0
1.65
1.12
V
V
V
V
VREF
VIH
0.88
High-level input voltage
Low-level input voltage
VREF + 0.1
VIL
VREF
0.1
–
VOL
Low-level output voltage
IOL = 36 mA (1)
0.65
V
Table 6–20. GTL I/O Specifications
Symbol
Parameter
Termination voltage
Reference voltage
High-level input voltage
Conditions
Minimum Typical Maximum Units
VTT
1.14
0.74
1.2
0.8
1.26
0.86
V
V
V
VREF
VIH
VREF
+
0.05
VIL
Low-level input voltage
Low-level output voltage
VREF
0.05
–
V
V
VOL
IOL = 40 mA (1)
0.4
Table 6–21. SSTL-18 Class I Specifications (Part 1 of 2)
Symbol
Parameter
Conditions
Minimum
Typical
1.8
Maximum
1.95
Units
VCCIO
Output supply voltage
Reference voltage
1.65
V
V
V
V
VREF
VTT
0.8
0.9
1.0
Termination voltage
High-level DC input voltage
VREF – 0.04
VREF
VREF + 0.04
VIH(DC)
VREF +
0.125
Altera Corporation
June 2006
6–17
Stratix GX Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
