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Analog Devices Inc./Maxim Integrated MAX6720AUTSDD3+T
- Part No.:
- MAX6720AUTSDD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6720AUTSDD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6720AUTSDD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory IC that monitors VCC1 (primary) and VCC2 (secondary) supply rails while supporting externally adjustable third-voltage monitoring via RSTIN. It asserts an active-low push-pull reset output when either supply drops below factory-trimmed thresholds (VTH1 = 3.075 V typ, VTH2 = 0.788 V typ), maintains reset for 140 ms minimum timeout, and operates down to VCC = 0.8 V - enabling reliable power sequencing in battery-powered telecom and industrial edge controllers.
For engineers reviewing the MAX6720AUTSDD3+T datasheet, MAX6720AUTSDD3+T pinout, MAX6720AUTSDD3+T application, or MAX6720AUTSDD3+T equivalent, key selection criteria include its dual-threshold supervision with 0.626 V internal reference for RSTIN, 14 µA typical supply current at 3.6 V, -40°C to +125°C operation, SOT23-6 package, and guaranteed reset validity during brownout conditions.
Technical Context
The MAX6720AUTSDD3+T integrates two independent voltage comparators (VCC1 and VCC2), an adjustable RSTIN comparator referenced to a 626 mV internal bandgap, and a dual-mode watchdog timer with 35 s startup and 1.12 s normal timeout. Its reset logic combines ORed fault detection across all monitored inputs and enforces a fixed 140 ms minimum reset assertion period after recovery.
It features push-pull RST and RST2 outputs referenced to VCC1 and VCC2 respectively, internal 50 kΩ MR pullup, and immunity to sub-20 µs VCC transients - ensuring robust operation in noisy DC-DC converter environments without spurious resets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.075 V (factory-trimmed, ±1.5% tolerance) - sets primary supply brownout detection point for 3.3 V systems |
| VCC2 Threshold | 0.788 V (factory-trimmed, ±1.5% tolerance) - enables monitoring of low-voltage core supplies like 0.9 V or 1.0 V rails |
| RSTIN Reference | 626 mV internal bandgap - allows precise external threshold setting for third supply (e.g., 1.2 V, 1.8 V, 2.5 V) using resistor divider |
| Reset Timeout | 140 ms (min) - ensures sufficient processor initialization time before release from reset |
| Supply Current | 14 µA (typ at 3.6 V) - minimizes quiescent load on battery or energy-harvesting power sources |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive, industrial control, and telecom base station applications |
| Package | SOT23-6 (U6+1 code) - 2.9 mm × 1.6 mm footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6720AUTSDD3+T is housed in a 6-pin SOT23 package (package code U6+1, outline 21-0058) with gull-wing leads, rated for -40°C to +125°C operation and JEDEC-compliant thermal performance (θJA = 115°C/W on multilayer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2/RSTIN drop below threshold or MR is pulled low |
| 2 | GND | Analog/digital ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual-reset input with internal 50 kΩ pullup to VCC1; debounced by 200 ns glitch rejection |
| 4 | VCC2 | Secondary supply input powering VCC2 comparator and RST2 output stage; supports 0.8 V to 5.5 V |
| 5 | VCC1 | Primary supply input powering core logic, VCC1 comparator, RST output, and MR pullup; supports 0.8 V to 5.5 V |
| 6 | RSTIN | High-impedance adjustable monitor input; triggers reset when voltage falls below 626 mV internal reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneous monitoring of VCC1 (1.58–4.63 V range) and VCC2 (0.79–3.08 V range) with separate thresholds and hysteresis |
| Externally adjustable third-voltage monitor | RSTIN input with 626 mV precision reference enables custom threshold setting for auxiliary rails (e.g., 1.2 V, 1.8 V) using passive divider |
| Guaranteed reset validity down to 0.8 V | Ensures correct reset state even during deep brownout - critical for fail-safe shutdown in power-constrained systems |
| Low-power operation | 14 µA typical ICC at 3.6 V enables multi-year battery life in always-on IoT sensors and portable equipment |
| Watchdog disable by floating WDI | No external components needed to disable watchdog; internal 200 nA current source detects open-circuit condition |
Applications
| Telecom Line Card Power Monitoring | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supervises dual 3.3 V and 1.2 V rails powering FPGA, PHY, and ADC in carrier-grade line cards subject to hot-swap transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-low RST to hold FPGA in reset until both supplies stabilize post-insertion. Use Value: Prevents configuration corruption during hot-swap by enforcing 140 ms minimum reset hold time and rejecting <20 µs VCC glitches. | Use Scenario: Monitors 24 V DC-to-DC converted 5 V and isolated 3.3 V rails in programmable logic controller I/O modules operating in factory-floor EMI environments. IC Role / Device Role / Timing Role: Primary supervisor detecting undervoltage on both rails and triggering system-level reset via RST; RSTIN used to monitor auxiliary 1.8 V FPGA core rail. Use Value: 0.8 V valid-reset guarantee ensures deterministic behavior during brownout, while 14 µA quiescent current reduces thermal load in sealed enclosures. |
| Battery-Powered Medical Sensor Hub | Automotive ADAS Camera Module |
Use Scenario: Powers wearable sensor fusion hub with Li-ion battery (3.0–4.2 V), buck-converted 1.8 V MCU rail, and LDO-regulated 1.2 V sensor rail. IC Role / Device Role / Timing Role: Supervises battery voltage (VCC1) and dual regulated rails (VCC2 + RSTIN); asserts reset if battery drops below 3.075 V or core rails sag. Use Value: Ultra-low 14 µA supply current extends battery runtime; RSTIN's 626 mV reference enables accurate 1.2 V monitoring without trimming resistors. | Use Scenario: Embedded in rear-view camera module with 12 V automotive input, 5 V imaging SoC rail, and 1.1 V image sensor core rail. IC Role / Device Role / Timing Role: Monitors 5 V SoC supply (VCC1) and 1.1 V sensor rail (VCC2); uses RSTIN to track pre-regulator input for early power-fail warning. Use Value: -40°C to +125°C rating ensures reliability in engine-bay proximity; push-pull RST drives automotive-grade reset net without external pullup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720AUTSD3+T | Same functionality but open-drain RST output instead of push-pull; requires external pullup resistor | Suitable where reset net is shared with other open-drain drivers or level-shifted interfaces | Select when system architecture mandates open-drain reset signaling or bidirectional μP reset pins |
| TPS3808G33DBVR | Single-supply supervisor (3.3 V only); no VCC2 or RSTIN inputs; 200 ms fixed timeout; 2.5 µA IQ | Limited to single-rail monitoring; lacks triple-voltage capability and wide temperature range | Choose only for cost-sensitive, single-rail applications where extended temp range and auxiliary monitoring are unnecessary |
Compared with MAX6720AUTSDD3+T, the MAX6720AUTSD3+T offers identical supervision logic but requires external pullup for reset signaling, while the TPS3808G33DBVR sacrifices dual/third-rail flexibility and automotive temperature support for lower quiescent current and lower unit cost in simple 3.3 V systems.
Availability
MAX6720AUTSDD3+T is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, battery-powered medical sensors, automotive ADAS modules, and set-top boxes requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6720AUTSDD3+T 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage, multi-rail supervision with integrated watchdog and power-fail functions - engineered specifically for space-constrained, high-reliability embedded systems requiring deterministic reset behavior during brownout and transient events.
FAQ
What is the exact reset timeout period for MAX6720AUTSDD3+T?
The MAX6720AUTSDD3+T has a guaranteed minimum reset timeout period of 140 ms, corresponding to the 'D3' suffix in its part number. This value is factory-trimmed and specified over the full -40°C to +125°C temperature range. The actual timeout may extend up to 280 ms depending on process variation and operating conditions, but system design must rely on the 140 ms minimum to ensure proper processor initialization. This timing begins after all monitored supplies (VCC1, VCC2, RSTIN) rise above their respective thresholds.
Does MAX6720AUTSDD3+T support monitoring a 1.2 V supply as VCC2?
Yes, MAX6720AUTSDD3+T supports monitoring a 1.2 V supply on VCC2. Its VCC2 reset threshold is factory-trimmed to 0.788 V (±1.5%), well within the 0.765–0.810 V range specified for the 'D' suffix, making it suitable for detecting undervoltage on 1.2 V rails. The device guarantees correct reset logic state as long as VCC2 remains ≥0.8 V, and its input voltage range extends to 5.5 V - accommodating both low-voltage cores and higher intermediate rails.
Can MAX6720AUTSDD3+T monitor three independent supply voltages simultaneously?
Yes, MAX6720AUTSDD3+T can monitor three independent supply voltages: VCC1 (primary), VCC2 (secondary), and a third voltage applied to the RSTIN pin. RSTIN uses an internal 626 mV reference, so a resistor divider (e.g., R1 = 100 kΩ, R2 = 51.1 kΩ) sets the trip point - for example, 1.2 V monitoring requires VEXT_TH = 626 mV × ((R1 + R2)/R2). This third channel operates independently and contributes to reset assertion alongside VCC1 and VCC2 faults.
What is the function of the MR pin on MAX6720AUTSDD3+T?
The MR (Manual Reset) pin on MAX6720AUTSDD3+T is an active-low input with an internal 50 kΩ pullup to VCC1. Pulling MR low forces an immediate reset assertion, which remains active for the full 140 ms timeout period after MR returns high. It supports CMOS-level drive and rejects <100 ns glitches. When unused, MR may be left floating or tied to VCC1; no external components are required for basic operation, simplifying board layout in space-constrained designs.
Is MAX6720AUTSDD3+T qualified for automotive applications?
MAX6720AUTSDD3+T is not AEC-Q100 qualified - only the MAX6719AUTTWD1/V+T variant in this family carries AEC-Q100 Grade 2 (-40°C to +105°C) certification. However, MAX6720AUTSDD3+T operates across -40°C to +125°C and is widely deployed in automotive-adjacent applications such as ADAS camera modules and infotainment power supplies where extended temperature range is required but formal qualification is not mandated by the end-customer.
MAX6720AUTSDD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 0.788V, 2.925V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6720AUTSDD3+T FAQ
1.How can I place an order for MAX6720AUTSDD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6720AUTSDD3+T 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 MAX6720AUTSDD3+T reliable?
The price and inventory of MAX6720AUTSDD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6720AUTSDD3+T is usually 5 days.
3.What payment methods are accepted for MAX6720AUTSDD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6720AUTSDD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6720AUTSDD3+T?
MAX6720AUTSDD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6720AUTSDD3+T 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 MAX6720AUTSDD3+T?
For technical support, including MAX6720AUTSDD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6720AUTSDD3+T requirements.
6.How does Aetrix verify that MAX6720AUTSDD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6720AUTSDD3+T 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 MAX6720AUTSDD3+T meets industry standards.
7.What is the process for return or replacement of MAX6720AUTSDD3+T?
All MAX6720AUTSDD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6720AUTSDD3+T, 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 MAX6720AUTSDD3+T part is unused and in its original packaging.
Return procedure for MAX6720AUTSDD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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