ANALOG DEVICES Multi Voltage Supervisors Owner's Manual

Description:
This guide is designed to work with Altera FPGAs, providing supervision for multiple voltage rails to ensure system stability and prevent unexpected behavior.

Supported Altera FPGA Families:
Agilex 7 F, Agilex 7 I, Stratix 10, Stratix V, Stratix IV, Arria 10, Arria V GX, Arria V GZ, Cyclone 10 GX, Cyclone 10 LP, Cyclone V, Cyclone IV MAX 10

Product Usage Instructions

1. Understanding the Core and I/O Voltages
Modern FPGA designs use lower core voltages requiring multiple voltage rails for I/O standards. It’s essential to match the correct voltages for stable operation.

2. Installation Steps

Identify the voltage requirements of your specific Altera FPGA model.

Select the appropriate ADI Multi-voltage Supervisor based on the monitored voltages and accuracy needed.
Connect the supervisor to the respective voltage rails of the FPGA following the provided guidelines.

Ensure proper power supply and connections before powering on the system.

3. Monitoring and Maintenance
Regularly monitor the voltages using the supervisor to detect ny variations or anomalies that could affect the FPGA’s performance. In case of any discrepancies, troubleshoot or replace the supervisor as needed.

Supervisory Devices Complementary Parts Guide for Altera FPGAs
Modern FPGA designs leverage advanced fabrication techniques, enabling smaller process geometries and lower core voltages. This trend, however, necessitates 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 Device provides 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 and I/O voltage requirements for various Altera® FPGA families are presented in a clear and easy-to-reference table. Core voltage ranges typically span from 0.70 V to 1.2 V, while I/O voltage levels can vary between 1 V and 3.3 V.

Multi-voltage Supervisors with Altera FPGAs

Altera FPGAs

Altera FPGA Family	Core Voltage (V)	I/O Voltage (V)
Agilex 7 F	0.70 – 0.90	1.2, 1.5
Agilex 7 I	0.70 – 0.90	1.2, 1.5
Stratix 10	0.8 – 0.94	1.2, 1.25, 1.35, 1.5, 1.8, 2.5, 3, 3.3
Stratix V	0.85, 0.9	1.2, 1.25, 1.35, 1.5, 1.8, 2.5, 3.0
Stratix IV	0.9	1.2, 1.5, 1.8, 2.5, 3.0
Arria 10	0.9, 0.95	1.2, 1.25, 1.35, 1.5, 1.8, 2.5, 3.0
Arria V GX	1.1, 1.15	1.2, 1.25, 1.35, 1.5, 1.8, 2.5, 3.0, 3.3
Arria V GZ	0.85	1.2, 1.25, 1.35, 1.5, 1.8, 2.5, 3.0
Cyclone 10 GX	0.9	1.2, 1.25, 1.35, 1.5, 1.8, 2.5, 3.0
Cyclone 10 LP	1.0, 1.2	1.2, 1.5, 1.8, 2.5, 3, 3.3
Cyclone V	1.1, 1.15	1.2, 1.25, 1.35, 1.5, 1.8, 2.5, 3.0, 3.3
Cyclone IV	1.0, 1.2	1.2, 1.5, 1.8, 2.5, 3, 3.3
MAX 10	1.2 or 3.0, 3.3	1.0, 1.2, 1.35, 1.5, 1.8, 2.5, 3, 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.

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 the 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 safer operating range for your power supply which improves the system’s overall performance.

Power Supply Sequencing

Modern FPGAs utilize multiple voltage rails for optimal performance. Defined power-up and power-down sequencing requirements are crucial for FPGA reliability. Improper sequencing introduces 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 power-down 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 Orange	Threshold Accuracy	Sequence	Programming Method	Package
1: cascadable	MAX16895	1.5 to 5.5V	1%	Up	R’s, C’s	6 udon
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
4: cascadable	MAX16050	2.7 to 16V	1.5%	Up, Reverse- Power Down	R’s, C’s	28 TQFN
5: cascadable	MAX16051	2.7 to 16V	1.5%	Up, Reverse- Power Down	R’s, C’s	28 TQFN
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

FAQ

Q: How do I know which ADI Multi-voltage Supervisor to choose?
A: Refer to the specifications of your Altera FPGA to determine the voltages that need monitoring. Match these requirements with the capabilities of the available supervisors to make an informed decision.

Documents / Resources

ANALOG DEVICES Multi Voltage Supervisors [pdf] Owner's Manual
MAX16163, MAX16164, MAX16132, MAX16135, Multi Voltage Supervisors, Voltage Supervisors, Supervisors

References

User Manual

ANALOG DEVICES Multi Voltage Supervisors

Product Information