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Analog Devices Inc./Maxim Integrated MAX6720AUTSHD3+
- Part No.:
- MAX6720AUTSHD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6720AUTSHD3+.pdf
- Description:
- IC SUPERVISOR MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,739
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Product details
Overview
MAX6720AUTSHD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference). It asserts active-low push-pull reset for ≥210ms after any monitored supply drops below threshold or manual reset is triggered. Used in multivoltage telecom and industrial systems requiring reliable power-up sequencing and brownout protection.
For engineers reviewing the MAX6720AUTSHD3+ datasheet, MAX6720AUTSHD3+ pinout, MAX6720AUTSHD3+ application, or MAX6720AUTSHD3+ equivalent, key selection criteria include dual-supply monitoring with factory-trimmed thresholds, 210ms reset timeout, push-pull RST output referenced to VCC1, and guaranteed reset validity down to VCC1/VCC2 = 0.8V.
Technical Context
The MAX6720AUTSHD3+ integrates three independent voltage monitors: primary (VCC1), secondary (VCC2), and auxiliary (RSTIN) with internal 626.5mV reference. Its reset logic combines OR-gated fault detection across all inputs and a programmable 210ms minimum timeout timer.
It features push-pull RST output referenced to VCC1, internal 50kΩ MR pullup, and immunity to sub-20µs VCC transients. The device operates over -40°C to +85°C and draws only 14µA typical supply current at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±125mV tolerance); ensures reliable reset assertion during 5V rail brownout |
| VCC2 Threshold | 3.075V (factory-trimmed, ±75mV tolerance); monitors 3.3V I/O or core supply integrity |
| RSTIN Reference | 626.5mV (internal bandgap); enables precise third-voltage monitoring via external resistor divider |
| Reset Timeout | 210ms (minimum); provides sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14µA (typical at 3.6V); minimizes quiescent power in battery-operated or always-on systems |
| Operating Temp | -40°C to +85°C; supports industrial and telecom equipment deployment without derating |
| Reset Output Type | Push-pull active-low RST referenced to VCC1; eliminates need for external pullup and ensures defined logic level during reset |
Pinout & Package
MAX6720AUTSHD3+ uses a 6-pin SOT23-6 package with 1.6mm × 2.9mm footprint and 0.95mm height, optimized for space-constrained PCB layouts in portable and embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation |
| 2 | GND | Analog/digital ground reference for all internal comparators and timing circuits |
| 3 | MR | Active-low manual reset input with internal 50kΩ pullup to VCC1; forces reset when pulled low |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry when > VCC1 and sets VCC2 monitor threshold |
| 5 | VCC1 | Primary supply input (1.8V–5.0V range); powers device when > VCC2 and sets VCC1 monitor threshold |
| 6 | RSTIN | Adjustable undervoltage comparator input; triggers reset when voltage falls below 626.5mV reference |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneous supervision of VCC1, VCC2, and RSTIN enables full-system power integrity verification in multirail designs |
| Factory-trimmed thresholds | VCC1 = 4.625V and VCC2 = 3.075V eliminate external resistor networks and improve production yield |
| 210ms reset timeout | Guaranteed minimum delay ensures µP and peripherals complete power-up before release |
| Push-pull RST output | Eliminates external pullup resistor requirement and guarantees valid logic levels across full VCC1 operating range |
| 0.8V reset validity | Ensures correct reset state even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring primary 5V DC/DC output and secondary 3.3V LDO in base station control cards. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail drops during load transients or thermal shutdown. Use Value: Prevents firmware corruption by holding µP in reset until both rails stabilize post-power-cycle or fault recovery. |
Use Scenario: Ensuring deterministic startup of ARM-based controller and isolated analog I/O in factory automation modules. IC Role / Device Role / Timing Role: Triple-monitoring 5V system, 3.3V logic, and 2.5V ADC reference via RSTIN divider. Use Value: Guarantees synchronized release of all subsystems after power-good confirmation, eliminating race conditions. |
| Network Router Line Cards | Battery-Powered Test Equipment |
Use Scenario: Supervising 12V-to-5V primary conversion and 5V-to-3.3V secondary regulation in high-density switch fabric. IC Role / Device Role / Timing Role: Detecting undervoltage on both rails and generating clean reset pulse with 210ms hold time. Use Value: Avoids partial initialization failures caused by marginal 3.3V rail during hot-swap events. |
Use Scenario: Managing power sequencing in handheld oscilloscope with Li-ion battery, 3.3V MCU, and 1.8V FPGA core. IC Role / Device Role / Timing Role: Using RSTIN to monitor battery voltage decay and trigger graceful shutdown before cutoff. Use Value: Extends usable battery life by enabling software-controlled save-and-hibernate before critical brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720AUTSD3+ | Same package and pinout, but open-drain RST output instead of push-pull; requires external pullup resistor. | Suitable for bidirectional µP reset pins or wired-OR reset bus configurations. | Select when interfacing with processors requiring open-drain reset or sharing reset line with other supervisors. |
| TPS3808G33DBVR | Dual-supply monitor only (no RSTIN); fixed 3.3V VDD threshold; 200ms timeout; SOT23-6 package. | Lacks third-voltage monitoring capability; no manual reset input; lower supply current (1.8µA). | Choose for cost-sensitive 3.3V-only systems where auxiliary voltage monitoring is unnecessary. |
Compared with MAX6720AUTSHD3+, the MAX6720AUTSD3+ offers identical monitoring functionality but requires external pullup due to open-drain RST, while TPS3808G33DBVR reduces feature set to cut cost and quiescent current-making it suitable only for simpler dual-rail applications without RSTIN or MR needs.
Availability
MAX6720AUTSHD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6720AUTSHD3+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX6715–MAX6729 family delivers ultra-low-voltage supervisory circuits targeting multirail embedded systems where reliability, small size, and low quiescent current are critical design constraints.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6720AUTSHD3+?
The MAX6720AUTSHD3+ has a factory-trimmed VCC1 reset threshold of 4.625V, with ±125mV tolerance over temperature and supply variations. This value is confirmed in the Reset Voltage Threshold Suffix Guide where "SH" corresponds to 4.625V. The threshold remains stable across the full -40°C to +85°C operating range with 20ppm/°C tempco.
Does the MAX6720AUTSHD3+ support monitoring a third voltage, and how is it configured?
Yes, the MAX6720AUTSHD3+ supports third-voltage monitoring via its RSTIN pin, which compares the applied voltage against an internal 626.5mV reference. To monitor a higher voltage (e.g., 12V), connect a resistor divider between the supply and GND, with the midpoint fed to RSTIN. The divider ratio must satisfy VEXT_TH = 626.5mV × (R1 + R2)/R2.
What is the function of the MR pin on the MAX6720AUTSHD3+, and does it require external components?
The MR pin on the MAX6720AUTSHD3+ is an active-low manual reset input with an internal 50kΩ pullup resistor to VCC1. No external components are required - simply pull MR low via a momentary switch or logic signal to force a reset. Reset remains asserted for the full 210ms timeout period after MR returns high, ensuring reliable processor restart.
Is the reset output of the MAX6720AUTSHD3+ push-pull or open-drain, and what are its drive capabilities?
The MAX6720AUTSHD3+ features a push-pull active-low RST output referenced to VCC1. It sources up to 800µA and sinks up to 3.2mA while maintaining VOL ≤ 0.4V at VCC1 ≥ 4.5V. This eliminates the need for an external pullup resistor and guarantees defined logic levels across the entire VCC1 operating range (0.8V–5.5V).
How does the MAX6720AUTSHD3+ ensure reliable reset operation during low-VCC conditions?
The MAX6720AUTSHD3+ guarantees valid reset output logic state down to VCC1 or VCC2 = 0.8V - well below typical microprocessor minimum supply requirements. This ensures the reset signal remains asserted during deep brownout events, preventing premature release and potential firmware corruption in systems with slow-falling supply rails.
MAX6720AUTSHD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Strip
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.313V, 2.925V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6720AUTSHD3+ FAQ
1.How can I place an order for MAX6720AUTSHD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6720AUTSHD3+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6720AUTSHD3+ reliable?
The price and inventory of MAX6720AUTSHD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6720AUTSHD3+ is usually 5 days.
3.What payment methods are accepted for MAX6720AUTSHD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6720AUTSHD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6720AUTSHD3+?
MAX6720AUTSHD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6720AUTSHD3+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6720AUTSHD3+?
For technical support, including MAX6720AUTSHD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6720AUTSHD3+ requirements.
6.How does Aetrix verify that MAX6720AUTSHD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6720AUTSHD3+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6720AUTSHD3+ meets industry standards.
7.What is the process for return or replacement of MAX6720AUTSHD3+?
All MAX6720AUTSHD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6720AUTSHD3+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6720AUTSHD3+ part is unused and in its original packaging.
Return procedure for MAX6720AUTSHD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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