Operating Conditions
Table 4–20. SSTL-2 Class I Specifications
Symbol
Parameter
Conditions
Minimum
2.375
Typical
2.5
Maximum
2.625
Unit
V
VCCIO
Output supply voltage
Termination voltage
VTT
VREF – 0.04
1.15
VREF
1.25
VREF + 0.04
1.35
V
VREF
Reference voltage
V
VIH(DC)
VIL(DC)
VIH(AC)
VIL(AC)
VOH
High-level DC input voltage
Low-level DC input voltage
High-level AC input voltage
Low-level AC input voltage
High-level output voltage
VREF + 0.18
–0.3
3.0
V
VREF – 0.18
V
VREF + 0.35
V
VREF – 0.35
VTT – 0.57
V
IOH = –8.1 mA
(3)
VTT + 0.57
V
VOL
Low-level output voltage
IOL = 8.1 mA (3)
V
Table 4–21. SSTL-2 Class II Specifications
Symbol
Parameter
Conditions
Minimum
2.375
Typical
2.5
Maximum
2.625
Unit
V
VCCIO
Output supply voltage
Termination voltage
VTT
VREF – 0.04
1.15
VREF
1.25
VREF + 0.04
1.35
V
VREF
Reference voltage
V
VIH(DC)
VIL(DC)
VIH(AC)
VIL(AC)
VOH
High-level DC input voltage
Low-level DC input voltage
High-level AC input voltage
Low-level AC input voltage
High-level output voltage
VREF + 0.18
–0.3
VCCIO + 0.3
VREF – 0.18
V
V
VREF + 0.35
V
VREF – 0.35
VTT – 0.76
V
IOH = –16.4 mA
(3)
VTT + 0.76
V
VOL
Low-level output voltage
IOL = 16.4 mA (3)
V
Table 4–22. SSTL-3 Class I Specifications (Part 1 of 2)
Symbol
Parameter
Conditions
Minimum
3.0
Typical
3.3
Maximum
3.6
Unit
V
VCCIO
Output supply voltage
Termination voltage
VTT
VREF – 0.05
1.3
VREF
1.5
VREF + 0.05
1.7
V
VREF
Reference voltage
V
VIH(DC)
VIL(DC)
VIH(AC)
High-level DC input voltage
Low-level DC input voltage
High-level AC input voltage
VREF + 0.2
–0.3
VCCIO + 0.3
VREF – 0.2
V
V
VREF + 0.4
V
4–12
Altera Corporation
January 2006
Stratix Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
