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5-6

MultiVolt I/O Interface in Stratix V Devices

SV51006

2014.01.10

MultiVolt I/O Interface in Stratix V Devices

The MultiVolt I/O interface feature allows Stratix V devices in all packages to interface with systems of

different supply voltages.

You can connect the V CCIO pins to a 1.2, 1.25, 1.35, 1.5, 1.8, 2.5, or 3.0 V power supply, depending on the

output requirements. The output levels are compatible with systems of the same voltage as the power supply.

For example, when V CCIO pins are connected to a 1.5 V power supply, the output levels are compatible with

1.5 V systems.

For LVDS applications:

? The LVDS I/O standard is not supported when V CCIO is 3.0 V.

? The LVDS input operations are supported when V CCIO is 1.2, 1.25, 1.35, 1.5, 1.8, or 2.5 V.

? The LVDS output operations are only supported when V CCIO is 2.5 V.

Table 5-3: MultiVolt I/O Support in Stratix V Devices

V CCIO (V)

1.2

1.25

1.35

1.5

1.8

2.5

3.0

V CCPD (V)

2.5

2.5

2.5

2.5

2.5

2.5

3.0

Input Signal (V)

1.2

1.25

1.35

1.5, 1.8

1.5, 1.8

2.5, 3.0, 3.3

2.5, 3.0, 3.3

Output Signal (V)

1.2

1.25

1.35

1.5

1.8

2.5

3.0, 3.3

The pin current may be slightly higher than the default value. Verify that the V OL maximum and V OH

minimum voltages of the driving device do not violate the applicable V IL maximum and V IH minimum

voltage specifications of the Stratix V device.

The V CCPD power pins must be connected to a 2.5 V or 3.0 V power supply. Using these power pins to supply

the pre-driver power to the output buffers increases the performance of the output pins.

Note: If the input signal is 3.0 V or 3.3 V, Altera recommends that you use an external clamping diode on

the I/O pins.

I/O Design Guidelines for Stratix V Devices

There are several considerations that require your attention to ensure the success of your designs. Unless

noted otherwise, these design guidelines apply to all variants of this device family.

Mixing Voltage-Referenced and Non-Voltage-Referenced I/O Standards

Each I/O bank can simultaneously support multiple I/O standards. The following sections provide guidelines

for mixing non-voltage-referenced and voltage-referenced I/O standards in the devices.

Altera Corporation

I/O Features in Stratix V Devices

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