DC & Switching Characteristics
Table 4–18. SSTL-18 Class I Specifications
Symbol
Parameter
Conditions
Minimum
1.65
Typical
1.8
Maximum
1.95
Unit
V
VCCIO
Output supply voltage
Reference voltage
VREF
VTT
0.8
0.9
1.0
V
Termination voltage
High-level DC input voltage
VREF – 0.04
VREF
VREF + 0.04
V
VIH(DC)
VREF
+
V
0.125
VIL(DC)
VIH(AC)
Low-level DC input voltage
High-level AC input voltage
VREF – 0.125
VREF – 0.275
VTT – 0.475
V
V
VREF
0.275
+
VIL(AC)
VOH
Low-level AC input voltage
High-level output voltage
V
V
IOH = –6.7 mA
(3)
VTT + 0.475
VOL
Low-level output voltage
IOL = 6.7 mA (3)
V
Table 4–19. SSTL-18 Class II Specifications
Symbol
Parameter
Conditions
Minimum
1.65
Typical
1.8
Maximum
1.95
Unit
V
VCCIO
Output supply voltage
Reference voltage
VREF
VTT
0.8
0.9
1.0
V
Termination voltage
High-level DC input voltage
VREF – 0.04
VREF
VREF + 0.04
V
VIH(DC)
VREF
+
V
0.125
VIL(DC)
VIH(AC)
Low-level DC input voltage
High-level AC input voltage
VREF – 0.125
VREF – 0.275
VTT – 0.630
V
V
VREF
0.275
+
VIL(AC)
VOH
Low-level AC input voltage
High-level output voltage
V
V
IOH = –13.4 mA
(3)
VTT + 0.630
VOL
Low-level output voltage
IOL = 13.4 mA (3)
V
Altera Corporation
January 2006
4–11
Stratix Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
