5. Using MAX V Devices in Multi-Voltage
Systems
December 2010
MV51005-1.0
MV51005-1.0
This chapter describes how to implement Altera® devices in multi-voltage systems
without damaging the device or the system.
Technological advancements in deep submicron processes have lowered the supply
voltage levels of semiconductor devices, creating a design environment where devices
on a system board may potentially use many different supply voltages such as 5.0, 3.3,
2.5, 1.8, 1.5, and 1.2 V, which can ultimately lead to voltage conflicts.
To accommodate interfacing with a variety of devices on system boards, MAX® V
devices have MultiVolt I/O interfaces that allow devices in a mixed-voltage design
environment to communicate directly with MAX V devices. The MultiVolt interface
separates the power supply voltage (VCCINT) from the output voltage (VCCIO),
allowing MAX V devices to interface with other devices using a different voltage level
on the same PCB. The 1.8-V input directly powers the core of the MAX V devices.
f For more information about hot socketing and power-on reset (POR), refer to the Hot
Socketing and Power-On Reset in MAX V Devices chapter.
This chapter contains the following sections:
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“I/O Standards” on page 5–1
“MultiVolt I/O Operation” on page 5–3
“5.0-V Device Compatibility” on page 5–3
“Recommended Operating Conditions for 5.0-V Compatibility” on page 5–7
“Power-Up Sequencing” on page 5–8
I/O Standards
The I/O buffer of MAX V devices is programmable and supports a wide range of I/O
voltage standards. You can program each I/O bank in a MAX V device to comply
with a different I/O standard. You can configure all I/O banks with the following
standards:
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3.3-V LVTTL/LVCMOS
2.5-V LVTTL/LVCMOS
1.8-V LVTTL/LVCMOS
1.5-V LVCMOS
1.2-V LVCMOS
Emulated LVDS output (LVDS_E_3R)
Emulated RSDS output (RSDS_E_3R)
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MAX V Device Handbook
December 2010
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