Altera Corporation 4–3
June 2006 Stratix Device Handbook, Volume 2
Selectable I/O Standards in Stratix & Stratix GX Devices
3.3-V LVCMOS - EIA/JEDEC Standard JESD8-B
The 3.3-V low voltage complementary metal oxide semiconductor
(LVCMOS) I/O standard is a general-purpose, single-ended standard
used for 3.3-V applications. The LVCMOS standard defines the DC
interface parameters for digital circuits operating from a 3.0-V or 3.3-V
power supply and driving or being driven by LVCMOS-compatible
devices.
The LVCMOS standard specifies the same input voltage requirements as
LVTTL (–0.5 V ≤V
I
≤3.8 V). The output buffer drives to the rail to meet the
minimum high-level output voltage requirements. The 3.3-V I/O
standard does not require input reference voltages or board terminations.
Stratix and Stratix GX devices support both input and output levels for
3.3-V LVCMOS operation.
2.5-V LVTTL Normal Voltage Range - EIA/JEDEC Standard
EIA/JESD8-5
The 2.5-V I/O standard is used for 2.5-V LVTTL applications. This
standard defines the DC interface parameters for high-speed, low-
voltage, non-terminated digital circuits driving or being driven by other
2.5-V devices. The input and output voltage ranges are:
■ The 2.5-V normal range input standards specify an input voltage
range of – 0.3 V ≤V
I
≤3.0 V.
■ The normal range minimum high-level output voltage requirement
(V
OH
) is 2.1 V.
Stratix and Stratix GX devices support both input and output levels for
2.5-V LVTTL operation.
2.5-V LVCMOS Normal Voltage Range - EIA/JEDEC Standard
EIA/JESD8-5
The 2.5-V I/O standard is used for 2.5-V LVCMOS applications. This
standard defines the DC interface parameters for high-speed, low-
voltage, non-terminated digital circuits driving or being driven by other
2.5-V parts. The input and output voltage ranges are:
■ The 2.5-V normal range input standards specify an input voltage
range of – 0.5 V ≤V
I
≤3.0 V.
■ The normal range minimum V
OH
requirement is 2.1 V.
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