Operating Conditions
Table 5–19. SSTL-2 Class I Specifications
Symbol
VCCIO
VTT
Parameter
Conditions
Minimum
2.375
Typical
2.500
VREF
Maximum Unit
Output supply voltage
Termination voltage
2.625
VREF + 0.04
1.313
V
V
V
V
V
V
V
V
V
VREF – 0.04
1.188
VREF
Reference voltage
1.250
V
V
IH (DC)
IL (DC)
High-level DC input voltage
Low-level DC input voltage
High-level AC input voltage
Low-level AC input voltage
High-level output voltage
Low-level output voltage
VREF + 0.18
–0.30
3.00
VREF – 0.18
VIH (AC)
VIL (AC)
VOH
VREF + 0.35
VREF - 0.35
VTT – 0.57
IOH = –8.1 mA (1)
IOL = 8.1 mA (1)
VTT + 0.57
VOL
Note to Table 5–19:
(1) This specification is supported across all the programmable drive settings available for this I/O standard as shown
in the Stratix II Architecture chapter in volume 1 of the Stratix II Device Handbook.
Table 5–20. SSTL-2 Class II Specifications
Symbol
VCCIO
VTT
Parameter
Conditions
Minimum
2.375
Typical
2.500
VREF
Maximum Unit
Output supply voltage
Termination voltage
2.625
V
V
V
V
V
V
V
V
V
VREF – 0.04
1.188
VREF + 0.04
1.313
VREF
Reference voltage
1.250
V
V
IH (DC)
IL (DC)
High-level DC input voltage
Low-level DC input voltage
High-level AC input voltage
Low-level AC input voltage
High-level output voltage
Low-level output voltage
VREF + 0.18
–0.30
VCCIO + 0.30
VREF – 0.18
VIH (AC)
VIL (AC)
VOH
VREF + 0.35
VREF - 0.35
VTT – 0.76
IOH = –16.4 mA (1) VTT + 0.76
IOL = 16.4 mA (1)
VOL
Note to Table 5–20:
(1) This specification is supported across all the programmable drive settings available for this I/O standard as shown
in the Stratix II Architecture chapter in volume 1 of the Stratix II Device Handbook.
5–12
Altera Corporation
April 2011
Stratix II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
