I/O Structure
■
■
■
■
■
1.5-V HSTL Class I and II
1.8-V HSTL Class I and II
1.2-V HSTL
SSTL-2 Class I and II
SSTL-18 Class I and II
Table 2–16 describes the I/O standards supported by Stratix II devices.
Table 2–16. Stratix II Supported I/O Standards (Part 1 of 2)
Input Reference
Voltage (VREF) (V) Voltage (VCCIO) (V) Voltage (VTT) (V)
Output Supply
BoardTermination
I/O Standard
Type
LVTTL
Single-ended
Single-ended
Single-ended
Single-ended
Single-ended
Single-ended
Single-ended
Differential
-
3.3
3.3
-
LVCMOS
-
-
2.5 V
-
2.5
-
1.8 V
-
1.8
-
1.5-V LVCMOS
3.3-V PCI
3.3-V PCI-X mode 1
LVDS
-
1.5
-
-
3.3
-
-
3.3
-
-
2.5 (3)
3.3
-
LVPECL (1)
Differential
-
-
-
-
HyperTransport technology Differential
2.5
Differential 1.5-V HSTL
Differential
0.75
1.5
0.75
Class I and II (2)
Differential 1.8-V HSTL
Class I and II (2)
Differential
0.90
0.90
1.25
1.8
1.8
2.5
0.90
0.90
1.25
Differential SSTL-18 Class Differential
I and II (2)
Differential SSTL-2 Class I Differential
and II (2)
1.2-V HSTL(4)
Voltage-referenced
0.6
0.75
0.9
1.2
1.5
1.8
1.8
0.6
0.75
0.9
1.5-V HSTL Class I and II Voltage-referenced
1.8-V HSTL Class I and II Voltage-referenced
SSTL-18 Class I and II
Voltage-referenced
0.90
0.90
2–86
Altera Corporation
May 2007
Stratix II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
