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Analog Devices Inc./Maxim Integrated MAX6720UTTGD3+
- Part No.:
- MAX6720UTTGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6720UTTGD3+.pdf
- Description:
- MAX6720 TRIPLE, ULTRA-LOW-VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:4,637
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Product details
Overview
MAX6720UTTGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) supply rails with factory-trimmed thresholds of 4.625V (VTH1), 3.075V (VTH2), and 626.5mV reference for RSTIN. It asserts an active-low push-pull reset output for ≥210ms after any monitored voltage falls below threshold or manual reset is triggered, and supports watchdog timer functionality with 35s startup and 1.12s normal timeout. It is used in multivoltage embedded systems requiring reliable power-on reset and brownout detection.
For engineers reviewing the MAX6720UTTGD3+ datasheet, MAX6720UTTGD3+ pinout, MAX6720UTTGD3+ application, or MAX6720UTTGD3+ equivalent, key selection criteria include its dual-supply monitoring capability (1.8–5.0V on VCC1, 0.9–3.3V on VCC2), externally adjustable third-voltage monitoring via RSTIN down to 0.62V, guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current at 3.6V, and push-pull RST output referenced to VCC1.
Technical Context
The MAX6720UTTGD3+ implements a triple-supply supervision architecture with independent comparators for VCC1, VCC2, and RSTIN, each feeding into a shared reset timeout timer. Its internal 626.5mV bandgap reference enables precise external threshold setting for the auxiliary rail using resistor dividers, while hysteresis (0.5% of VTH) prevents chatter during slow voltage transitions.
It integrates a dual-mode watchdog timer: a 35s minimum initial timeout after power-up or reset ensures safe boot completion, followed by a 1.12s minimum normal-mode timeout that requires periodic WDI edge transitions to prevent system lockup. The push-pull RST output drives high to 0.8×VCC1 (min) and low to 0.4V (max at 3.2mA sink), eliminating need for external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), factory-trimmed - sets primary supply brownout detection point for 5V or 4.8V logic rails |
| VCC2 Reset Threshold | 3.075V (typ), factory-trimmed - monitors secondary 3.3V I/O or analog supply with ±1.5% tolerance |
| RSTIN Reference Voltage | 626.5mV (typ), internal - enables accurate third-rail monitoring down to 0.62V via external resistor divider |
| Reset Timeout Period | 210ms (typ), min 140ms - ensures sufficient hold time for processor initialization and memory stabilization |
| Supply Current | 14µA (typ) at 3.6V - enables use in battery-backed or ultra-low-power always-on monitoring applications |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom equipment deployed in uncontrolled environments |
| Reset Output Type | Active-low push-pull - eliminates external pullup requirement and provides robust drive to µP reset pin |
Pinout & Package
MAX6720UTTGD3+ is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low when any monitored supply fails or MR is pulled low |
| 2 | GND | Analog/digital ground reference for all internal comparators and timing circuits |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; initiates reset on falling edge and holds for full timeout period |
| 4 | VCC2 | Secondary supply input (0.9–3.3V); powers internal circuitry when > VCC1 and serves as reference for VCC2 comparator |
| 5 | VCC1 | Primary supply input (1.8–5.0V); powers device when > VCC2 and serves as reference for VCC1 comparator and RST output |
| 6 | RSTIN | High-impedance auxiliary voltage monitor input; compared against 626.5mV internal reference to detect third-rail undervoltage |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC1 (4.625V), VCC2 (3.075V), and RSTIN (0.626V ref) - eliminates need for multiple discrete supervisors in multirail systems |
| Push-pull RST output | Drives high to ≥0.8×VCC1 and low to ≤0.4V at 3.2mA - ensures clean, fast reset assertion without external components |
| Dual-mode watchdog timer | 35s startup + 1.12s normal timeout - accommodates long boot sequences while maintaining tight runtime fault detection |
| Guaranteed reset validity | Operates correctly down to VCC1 or VCC2 = 0.8V - ensures reliable reset assertion even during deep brownout conditions |
| Low supply current | 14µA typical at 3.6V - extends battery life in portable or energy-harvesting applications |
Applications
| Industrial PLC Power Management | Telecom Line Card Supervision |
|---|---|
Use Scenario: Monitoring 5V main logic, 3.3V I/O, and 1.2V core supplies in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting synchronized reset across FPGA, MCU, and communication ICs during power sequencing faults. Use Value: Prevents partial initialization and metastability by holding reset until all three rails stabilize above their respective thresholds for ≥210ms. |
Use Scenario: Ensuring reliable boot and runtime supervision of DSP, PHY, and management MCU on telecom line cards with split 3.3V/1.8V/1.2V rails. IC Role / Device Role / Timing Role: Primary supervisor providing push-pull reset to DSP and enabling watchdog monitoring of firmware execution via WDI. Use Value: Eliminates need for discrete reset generators and external pullups, reducing BOM count and PCB area in space-constrained line card designs. |
| Medical Diagnostic Imaging Module | Automotive Infotainment Head Unit |
Use Scenario: Supervising 5V analog front-end, 3.3V digital interface, and 2.5V sensor bias supplies in portable ultrasound modules. IC Role / Device Role / Timing Role: Fault-detection supervisor triggering hard reset upon any rail collapse, with RSTIN used to monitor battery backup voltage. Use Value: Enables fail-safe shutdown before corrupted image data is written to flash, meeting IEC 62304 safety requirements. |
Use Scenario: Managing power integrity across 5V system, 3.3V CAN transceiver, and 1.8V SoC core in automotive infotainment head units. IC Role / Device Role / Timing Role: Triple-rail supervisor with MR input for service-mode reset and watchdog for software hang detection in Linux-based head unit firmware. Use Value: Provides deterministic reset behavior under cold-crank (low-VCC) and load-dump (high-VCC) conditions per ISO 7637-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720UTTGD2+ | Same package and pinout, but 140ms (min) reset timeout vs. 210ms (min) for MAX6720UTTGD3+ | Suitable where shorter reset hold time is acceptable for faster system recovery | Select MAX6720UTTGD2+ if boot sequence completes within 140ms; otherwise retain MAX6720UTTGD3+ for margin. |
| TPS3808G33DBVR | Dual-supply (not triple), 3.3V fixed VDD monitor only, no RSTIN input, 200ms timeout, open-drain RST | Lacks auxiliary rail monitoring and push-pull output - requires external pullup and cannot replace third-rail supervision | Use only if system has exactly two critical rails and can tolerate open-drain reset; MAX6720UTTGD3+ remains superior for triple-rail integrity. |
Compared with MAX6720UTTGD2+, MAX6720UTTGD3+ provides longer reset assertion for safer initialization of complex processors; compared with TPS3808G33DBVR, it adds essential third-rail monitoring and eliminates pullup dependency via push-pull RST - making it the only direct functional replacement for triple-supply systems requiring guaranteed reset validity down to 0.8V.
Availability
MAX6720UTTGD3+ is available at Aetrix Electronics and suitable for industrial PLC power management, telecom line card supervision, medical diagnostic imaging modules, and automotive infotainment head units requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6720UTTGD3+ 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX6715–MAX6729 family was designed specifically for multivoltage embedded systems needing compact, low-power, triple-rail supervision with flexible reset timing and integrated watchdog functionality - targeting space-constrained, reliability-critical applications.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6720UTTGD3+?
The MAX6720UTTGD3+ has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with a guaranteed range of 4.500V to 4.750V over temperature. This value is encoded in the "TG" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6720UTTGD3+ variant - not the entire MAX6720 family.
Does the MAX6720UTTGD3+ support monitoring a third supply voltage, and how is it configured?
Yes, the MAX6720UTTGD3+ supports third-supply monitoring via the 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 MAX6720UTTGD3+ datasheet provides the formula VEXT_TH = 626.5mV × ((R1 + R2)/R2) for threshold calculation.
What is the reset timeout period of the MAX6720UTTGD3+, and is it adjustable?
The MAX6720UTTGD3+ has a fixed reset timeout period of 210ms (typical), with a minimum guaranteed value of 140ms. This value is set by the "D3" suffix in the part number and is implemented via internal RC timing - it is not user-adjustable via external components. The timeout begins when all monitored supplies rise above their thresholds and ends with deassertion of the RST output.
Is the reset output of the MAX6720UTTGD3+ push-pull or open-drain, and what are its drive capabilities?
The MAX6720UTTGD3+ features an active-low push-pull reset output (RST pin). It drives high to ≥0.8 × VCC1 (e.g., 4.0V at VCC1 = 5V) with 200µA source current, and low to ≤0.4V with up to 3.2mA sink current. This eliminates the need for an external pullup resistor and ensures robust interfacing with microprocessor reset inputs.
Can the MAX6720UTTGD3+ operate reliably during deep brownout conditions?
Yes, the MAX6720UTTGD3+ guarantees valid reset output logic state as long as either VCC1 or VCC2 remains above 0.8V - confirmed across the full -40°C to +85°C operating range. This ensures deterministic reset assertion even during severe input undervoltage events, a key requirement for industrial and automotive power management systems.
MAX6720UTTGD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.11V, 3.075V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6720UTTGD3+ FAQ
1.How can I place an order for MAX6720UTTGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6720UTTGD3+ 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 MAX6720UTTGD3+ reliable?
The price and inventory of MAX6720UTTGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6720UTTGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6720UTTGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6720UTTGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6720UTTGD3+?
MAX6720UTTGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6720UTTGD3+ 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 MAX6720UTTGD3+?
For technical support, including MAX6720UTTGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6720UTTGD3+ requirements.
6.How does Aetrix verify that MAX6720UTTGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6720UTTGD3+ 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 MAX6720UTTGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6720UTTGD3+?
All MAX6720UTTGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6720UTTGD3+, 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 MAX6720UTTGD3+ part is unused and in its original packaging.
Return procedure for MAX6720UTTGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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