Supervisory Devices Complementary Parts
Guide for Xilinx FPGAs
MAX16163 Nano Power Controller
Modern FPGA designs leverage advance fabrication techniques, enabling smaller process geometries and lower core voltages. This trend, however, necessitate the use of multiple voltage rails to accommodate legacy I/O standards. To guarantee system stability and prevent unexpected behavior, each of these voltage rails requires dedicated supervision. Analog Devices offers a comprehensive portfolio of voltage monitoring solutions, encompassing a wide range; from basic single-channel to feature-rich multi-voltage supervisors boasting industry-leading accuracy (up to ±0.3% across temperatures). The core, I/O, and auxiliary voltage requirements for various Xilinx® FPGA families are resented in a clear and easy-to-reference table. Core voltage ranges typically span from 0.72 V to 1 V, while I/O voltage levels can vary between 1 V and 3.3 V.
Multi-voltage Supervisors with Xilinx FPGAs
Xilinx FPGAs
| Xilinx FPGA Family | Core Voltage (V) | Auxiliary Voltage (V) | I/O Voltage (V) |
| Virtex UltraScale+ | 0.85, 0.72, 0.90 | 1.8 | 1.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3 |
| Virtex UltraScale | 0.95, 1 | 1.8 | 1.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3 |
| Virtex 7 | 1, 0.90 | 1.8, 2.0 | 1.2, 1.35, 1.5, 1.8, 2.5, 3.3 |
| Kintex UltraScale+ | 0.85, 0.72, 0.90 | 1.8 | 1.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3 |
| Kintex UltraScale | 0.95, 0.90, 1.0 | 1.8 | 1.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3 |
| Kintex 7 | 1, 0.90, 0.95 | 1.8 | 1.2, 1.35, 1.5, 1.8, 2.5, 3.3 |
| Artix UtraScale+ | 0.85, 0.72 | 1.8 | 1.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3 |
| Artix 7 | 1.0, 0.95, 0.90 | 1.8 | 1.2, 1.35, 1.5, 1.8, 2.5, 3.3 |
| Spartan Ultrascale+ | 0.85, 0.72, 0.90 | 1.8 | 1.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3.3 |
| Spartan 7 | 1, 0.95 | 1.8 | 1.2, 1.35, 1.5, 1.8, 2.5, 3.3 |
ADI Multi-voltage Supervisors
| Number of Voltages Monitored | Part Number | Voltages Monitored (V) | Accuracy (%) |
| 1 | MAX16132 | 1.0 to 5.0 | <1 |
| 1 | MAX16161,MAX16162 | 1.7 to 4.85, 0.6 to 4.85 | <1.5 |
| 2 | MAX16193 | 0.6 to 0.9, 0.9 to 3.3 | <0.3 |
| 3 | MAX16134 | 5.0, 4.8, 4.5, 3.3, 3.0, 2.5, 1.8, 1.2, 1.16, 1.0 |
<1 |
| 4 | LTC2962, LTC2963, LTC2964 | 5.0, 3.3, 2.5, 1.8, 1.5, 1.2, 1.0, 0.5V |
<0.5 |
| 4 | MAX16135 | 5.0, 4.8, 4.5, 3.3, 3.0, 2.5, 2.3, 1.8, 1.5, 1.36, 1.22, 1.2, 1.16, 1.0 |
<1 |
| 4 | MAX16060 | 3.3, 2.5, 1.8, 0.62 (adj) | <1 |
| 6 | LTC2936 | 0.2 to 5.8 (Programmable) | <1 |
Window Voltage Supervisors
Window voltage supervisors are used to ensure FPGAs operate within a safe voltage specification range.
They do this by having undervoltage (UV) and overvoltage (OV) thresholds and generating a reset output signal if it goes beyond the tolerance window to avoid system errors and prevent damage to your FPGAs and other processing devices. There are two main things to consider when choosing a window voltage supervisor: Tolerance and Threshold Accuracy.
Tolerance is the range around the nominal monitored value which sets the overvoltage and undervoltage thresholds. While, Threshold Accuracy, typically expressed in percentage, is the degree of the conformance of the actual to the target reset thresholds.
Undervoltage and overvoltage threshold variation with Threshold Accuracy
Selecting the Right Tolerance Window
Choosing a window supervisor with the same tolerance as the core voltage requirement can lead to malfunctions due to threshold accuracy. Setting the same tolerance with the operating requirement of the FPGA can trigger a reset output near the maximum overvoltage threshold OV_TH (max) and minimum undervoltage threshold UV_TH (min). The figure below illustrates tolerance setting (a) same with core voltage tolerance vs. (b) within the core voltage tolerance.
Impact of Threshold Accuracy
Compare two window voltage supervisors with different threshold accuracy monitoring the same core voltage supply rail. The supervisor with higher threshold accuracy will deviate less from the threshold limits in comparison to voltage supervisors with lower accuracy.
Examining the figure below, window supervisors with lower accuracy (a) creates a narrow power supply window since the reset output signal can assert anywhere within the UV and OV monitoring range. In applications with unreliable power supply regulation, this could pose a more sensitive system prone to oscillation. On the other hand, supervisors with high threshold accuracy (b) expands this range to provide a wider safe operating range for your power supply which improves the systems overall performance.
Power Supply Sequencing
Modern FPGAs utilize multiple voltage rails for optimal performance. Defined power-up and power-down sequencing requirement is crucial for FPGA reliability. Improper sequencing introduce glitches, logic errors, and even permanent damage to sensitive FPGA components. Analog Devices offers a comprehensive range of supervisory/sequencing circuits specifically designed to address the challenges of FPGA power management. These devices orchestrate the power-up and powerdown sequence of various voltage rails, guaranteeing that each rail reaches its designated voltage level within its required ramp time and order. This power management solution minimizes inrush current, prevents voltage undershoot/overshoot conditions, and ultimately safeguards the integrity of your FPGA design.
ADI Supervisory and Sequencing Solutions
| Number of Supplies Monitored | Part Number | Operating Vrange | Threshold Accuracy | Sequence | Programming Method | Package |
| 1: cascadable | MAX16895 | 1.5 to 5.5V | 1% | Up | R’s, C’s | 6 uDFN |
| 1: cascadable | MAX16052, MAX16053 | 2.25 to 28V | 1.8% | Up | R’s, C’s | 6 SOT23 |
| 2: cascadable | MAX6819, MAX6820 | 0.9 to 5.5V | 2.6% | Up | R’s, C’s | 6 SOT23 |
| 2 | MAX16041 | 2.2 to 28V | 2.7% and 1.5% |
Up | R’s, C’s | 16 TQFN |
| 3 | MAX16042 | 20 TQFN | ||||
| 4 | MAX16043 | 24 TQFN | ||||
| 4: cascadable | MAX16165, MAX16166 | 2.7 to 16V | 0.80% | Up, Reverse- Power Down | R’s, C’s | 20 WLP, 20L TQFN |
| MAX16050 | 2.7 to 16V | 1.5% | Up, Reverse- Power Down | R’s, C’s | 28 TQFN | |
| 5: cascadable | MAX16051 | |||||
| 6: cascadable | LTC2937 | 4.5 to 16.5V | <1.5% | Programmable | I2C, SMBus | 28 QFN |
| 8 | ADM1168 | 3 to 16V | <1% | Programmable | SMBus | 32 LQFP |
| 8 | ADM1169 | 3 to 16V | <1% | Programmable | SMBus | 32 LQFP, 40 LFCSP |
| 10: cascadable (max of 4) | ADM1260 | 3 to 16V | <1% | Programmable | SMBus | 40 LFCSP |
| 12: cascadable | ADM1166 | 3 to 16V | <1% | Programmable | SMBus | 40 LFCSP, 48 TQFP |
| 17: cascadable | ADM1266 | 3 to 15V | <1% | Programmable | PMBus | 64 LFCSP |
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Documents / Resources
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ANALOG DEVICES MAX16163 Nano Power Controller [pdf] Instructions MAX16163, MAX16164, MAX16132, MAX16133, MAX16134, MAX16135, LTC2937, MAX16163 Nano Power Controller, MAX16163, Nano Power Controller, Power Controller, Controller |
