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1.1. Definitions
1.2. Understanding SSN
1.3. Guidelines: Data Input Pin
1.4. Guidelines: Clock and Asynchronous Control Input Signal
1.5. Guidelines: Clock and Data Input Signal for MAX® 10 E144 Package
1.6. Guidelines: I/O Restriction Rules
1.7. Guidelines: Placement Restrictions for 1.0 V I/O Pin
1.8. Guidelines: LVTTL/LVCMOS I/O Utilization for MAX® 10 FPGA Package B610
1.9. Guidelines: External Memory Interface I/O Restrictions
1.10. Guidelines: Board Design Requirement for DDR2, DDR3, and LPDDR2
1.11. Guidelines: Analog-to-Digital Converter I/O Restriction
1.12. Guidelines: Voltage-Referenced I/O Standards Restriction
1.13. Guidelines: Adhere to the LVDS I/O Restrictions Rules
1.14. Guidelines: Enable Clamp Diode for LVTTL/LVCMOS Input Buffers
1.15. Guidelines: ADC Ground Plane Connection
1.16. Guidelines: Board Design for ADC Reference Voltage Pin
1.17. Guidelines: Board Design for Analog Input
1.18. Guidelines: Board Design for Power Supply Pin and ADC Ground (REFGND)
1.19. Guidelines: MAX® 10 Variable Pitch BGA (VPBGA) Package Overview and Board Fan-Out Recommendations
1.20. Document Revision History for the MAX® 10 FPGA Signal Integrity Design Guidelines
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1.14. 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, Altera 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.
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 |