Intel® MAX® 10 FPGA Signal Integrity Design Guidelines

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ID 683572
Date 10/31/2022
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Document Table of Contents x
Intel® MAX® 10 FPGA Signal Integrity Design Guidelines
Intel® MAX® 10 FPGA Signal Integrity Design Guidelines x
Definitions Understanding SSN Guidelines: Clock and Asynchronous Control Input Signal Guidelines: Data Input Pin Guidelines: Clock and Data Input Signal for Intel® MAX® 10 E144 Package Guidelines: I/O Restriction Rules Guidelines: Placement Restrictions for 1.0 V I/O Pin Guidelines: Analog-to-Digital Converter I/O Restriction Guidelines: Voltage-Referenced I/O Standards Restriction Guidelines: Adhere to the LVDS I/O Restrictions Rules Guidelines: Enable Clamp Diode for LVTTL/LVCMOS Input Buffers Guidelines: External Memory Interface I/O Restrictions Guidelines: ADC Ground Plane Connection Guidelines: Board Design for ADC Reference Voltage Pin Guidelines: Board Design for Analog Input Guidelines: Board Design for Power Supply Pin and ADC Ground (REFGND) Guidelines: Intel® MAX® 10 Board Design Requirement for DDR2, DDR3, and LPDDR2 Document Revision History for Intel® MAX® 10 FPGA Signal Integrity Design Guidelines
Guidelines: Clock and Asynchronous Control Input Signal x
Schmitt-Trigger Input Buffer
Guidelines: Placement Restrictions for 1.0 V I/O Pin x
Calculating the Total Inductance for 1.0 V Pin Placement
Intel® MAX® 10 FPGA Signal Integrity Design Guidelines

Guidelines: Enable Clamp Diode for LVTTL/LVCMOS Input Buffers

If the input voltage to the LVTTL/LVCMOS input buffers is higher than the VCCIO of the I/O bank, Intel recommends that you enable the clamp diode.
  • 3.3 V LVCMOS/LVTTL input buffers—enable clamp diode if VCCIO of the I/O bank is 3.0 V.
  • 3.3 V or 3.0 V LVCMOS/LVTTL input buffers—enable clamp diode if VCCIO of the I/O bank is 2.5 V.

By enabling the clamp diode under these conditions, you limit overshoot. However, this does not comply with hot socket current specification.

If you do not enable the clamp diode under these conditions, the signal integrity for the I/O pin is impacted and overshoot occurs. In this situation, you must ensure that your board design conforms to the overshoot specifications.

Table 10.  Voltage Tolerance Maximum Ratings for 3.3 V or 3.0 VThis table lists the voltage tolerance specifications. Ensure that your board design conforms to these specifications if you do not want to follow the clamp diode recommendation.
Voltage Minimum (V) Maximum (V)
VCCIO = 3.3 V 3.135 3.45
VCCIO = 3.0 V 2.85 3.15
VIH (AC) — 4.1
VIH (DC) — 3.6
VIL (DC) –0.3 0.8
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