Operating Conditions
Table 6–21. SSTL-18 Class I Specifications (Part 2 of 2)
Symbol
Parameter
Conditions
Minimum
Typical
Maximum
Units
VIL(DC)
Low-level DC input voltage
VREF
–
V
0.125
VIH(AC)
VIL(AC)
VOH
High-level AC input voltage
Low-level AC input voltage
High-level output voltage
Low-level output voltage
VREF
0.275
+
V
V
V
V
VREF
0.275
–
IOH = –6.7 mA
(1)
VTT + 0.475
VOL
IOL = 6.7 mA (1)
VTT – 0.475
Table 6–22. SSTL-18 Class II Specifications
Symbol
Parameter
Conditions
Minimum
1.65
Typical
1.8
Maximum
1.95
Units
VCCIO
Output supply voltage
Reference voltage
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
VIL(DC)
VIH(AC)
VIL(AC)
VOH
Low-level DC input voltage
High-level AC input voltage
Low-level AC input voltage
High-level output voltage
Low-level output voltage
VREF
0.125
–
–
V
V
V
V
V
VREF
0.275
+
VREF
0.275
IOH = –13.4 mA VTT + 0.630
(1)
VOL
IOL = 13.4 mA (1)
VTT – 0.630
Table 6–23. SSTL-2 Class I Specifications (Part 1 of 2)
Symbol
Parameter
Conditions
Minimum
2.375
Typical
2.5
Maximum
2.625
Units
VCCIO
Output supply voltage
Termination voltage
Reference voltage
V
V
V
V
V
VTT
VREF
VIH
VREF – 0.04
1.15
VREF
1.25
VREF + 0.04
1.35
High-level input voltage
Low-level input voltage
VREF + 0.18
–0.3
3.0
VIL
VREF – 0.18
6–18
Altera Corporation
June 2006
Stratix GX Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
