DC & Switching Characteristics
Table 5–21. SSTL-2 Class I & II Differential Specifications
Symbol
Parameter
Conditions
Minimum
2.375
Typical
Maximum
Unit
V
VCCIO
Output supply voltage
2.500
2.625
VSWING DC differential input voltage
(DC)
0.36
V
VX (AC) AC differential input cross
point voltage
(VCCIO/2) – 0.2
0.7
(VCCIO/2) + 0.2
V
V
VSWING AC differential input voltage
(AC)
VISO
Input clock signal offset
voltage
0.5 × VCCIO
200
V
ΔVISO
Input clock signal offset
voltage variation
mV
V
VOX
(AC)
AC differential output cross
point voltage
(VCCIO/2) – 0.2
(VCCIO/2) + 0.2
Table 5–22. 1.2-V HSTL Specifications
Symbol
VCCIO
Parameter
Output supply voltage
Reference voltage
Conditions
Minimum
Typical
Maximum
1.26
Unit
V
1.14
1.20
VREF
0.48 × VCCIO 0.50 × VCCIO
VREF + 0.08
–0.15
0.52 × VCCIO
VCCIO + 0.15
VREF – 0.08
VCCIO + 0.24
VREF – 0.15
VCCIO + 0.15
VREF – 0.15
V
V
V
V
V
IH (DC) High-level DC input voltage
V
IL (DC) Low-level DC input voltage
IH (AC) High-level AC input voltage
IL (AC) Low-level AC input voltage
V
VREF + 0.15
–0.24
V
V
VOH
VOL
High-level output voltage
Low-level output voltage
IOH = 8 mA
VREF + 0.15
–0.15
V
IOH = –8 mA
V
Altera Corporation
April 2011
5–13
Stratix II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
