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Analog Devices Inc./Maxim Integrated MAX6720AUTSHD3+T
- Part No.:
- MAX6720AUTSHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6720AUTSHD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6720AUTSHD3+T 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 (626mV reference). It asserts active-low push-pull reset for ≥210ms after any supply drop, manual reset, or watchdog timeout, and guarantees valid reset output down to VCC1 or VCC2 = 0.8V. It supports battery-powered embedded systems requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6720AUTSHD3+T datasheet, MAX6720AUTSHD3+T pinout, MAX6720AUTSHD3+T application, or MAX6720AUTSHD3+T equivalent, key selection criteria include confirmed dual-supply monitoring with factory-trimmed thresholds, push-pull RST output referenced to VCC1, 210ms min reset timeout, watchdog timer with 35s startup/1.12s normal mode, and guaranteed operation at VCC ≥ 0.8V.
Technical Context
The MAX6720AUTSHD3+T implements a dual-threshold voltage monitor (VCC1/VCC2) plus a high-impedance RSTIN comparator with 626mV internal reference, enabling precise third-voltage supervision via external resistor divider. Its reset logic combines asynchronous assertion on any monitored fault with a monotonic timeout counter that restarts if thresholds are re-breached before timeout completion.
This device integrates a dual-mode watchdog timer: a 35s minimum initial timeout after any reset event (supporting boot sequences), followed by a 1.12s minimum normal timeout triggered by the first WDI edge; it also includes a manual reset input with 50kΩ internal pullup to VCC1 and glitch rejection of 100ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed falling threshold; ensures reset assertion when primary supply drops below nominal 5V rail) |
| VCC2 Threshold | 3.075V (factory-trimmed falling threshold; monitors secondary 3.3V rail with ±75mV hysteresis) |
| RSTIN Reference | 626mV (internal precision reference; enables monitoring of auxiliary supplies down to 0.62V via resistor divider) |
| Reset Timeout | 210ms (minimum guaranteed duration; holds µP in reset long enough for stable power recovery and initialization) |
| Supply Current | 14µA typical at 3.6V (ultra-low quiescent current; extends battery life in portable equipment) |
| Operating Temp | -40°C to +85°C (industrial-grade temperature range; suitable for telecom, industrial, and automotive-adjacent applications) |
| Reset Output Type | Push-pull active-low (driven to VCC1; eliminates need for external pullup and ensures defined logic level during reset assertion) |
Pinout & Package
MAX6720AUTSHD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and multivoltage systems.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on VCC1/VCC2/RSTIN fault or MR activation |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; resets system when pulled low |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V); powers internal circuitry when above VCC1 and sets VCC2 threshold reference |
| 5 | VCC1 | Primary supply input (1.8V–5.0V); powers device when above VCC2 and sets VCC1 threshold reference |
| 6 | RSTIN | Adjustable undervoltage monitor input; compares external voltage to 626mV reference to trigger reset |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitoring | VCC1 = 4.625V and VCC2 = 3.075V thresholds eliminate external resistor networks and calibration effort |
| Externally adjustable third-voltage monitor | RSTIN input with 626mV reference enables precise supervision of auxiliary rails (e.g., 1.2V core, 1.8V I/O) using two resistors |
| Dual-mode watchdog timer | 35s startup timeout accommodates full system boot; 1.12s normal timeout detects runtime processor hangs without false triggers |
| Guaranteed reset validity down to 0.8V | Ensures clean, deterministic reset assertion even during deep brownout conditions on either supply rail |
| Immunity to short VCC transients | Rejects glitches <20µs at 100mV overdrive, preventing spurious resets in noisy power environments |
Applications
| Industrial PLC Power Sequencing | Portable Medical Device Battery Monitoring |
|---|---|
Use Scenario: A programmable logic controller uses separate 5V, 3.3V, and 1.2V rails for CPU, I/O, and sensor interfaces. IC Role / Device Role / Timing Role: MAX6720AUTSHD3+T monitors all three rails and asserts reset until all stabilize post-power-up, ensuring deterministic firmware execution. Use Value: Prevents corrupted state transitions during partial power-up by enforcing 210ms minimum reset hold time across all monitored supplies. |
Use Scenario: A handheld ECG monitor operates from a single Li-ion cell (2.8–4.2V) with DC/DC converters generating 3.3V and 1.8V rails. IC Role / Device Role / Timing Role: MAX6720AUTSHD3+T supervises the 3.3V main rail (VCC1), 1.8V analog rail (VCC2), and battery voltage (RSTIN via divider) to detect end-of-life discharge. Use Value: Uses 626mV RSTIN reference to accurately trigger shutdown at 2.7V battery voltage, extending usable runtime while protecting data integrity. |
| Telecom Line Card Voltage Integrity | Embedded Network Router Boot Reliability |
Use Scenario: A modular line card in a carrier-grade switch requires simultaneous validation of +12V, +3.3V, and -48V supplies. IC Role / Device Role / Timing Role: MAX6720AUTSHD3+T monitors +3.3V (VCC1), +12V-derived 3.075V (VCC2), and -48V via PFI-compatible resistor network on RSTIN. Use Value: Leverages RSTIN's 626mV reference and high-impedance input to supervise negative rails without additional op-amps or level shifters. |
Use Scenario: A wireless router boots Linux from flash and must ensure memory, PHY, and CPU rails are stable before initialization. IC Role / Device Role / Timing Role: MAX6720AUTSHD3+T provides 210ms reset hold and integrated watchdog to catch bootloader hangs or kernel panics. Use Value: Dual-mode watchdog (35s boot window + 1.12s runtime timeout) eliminates need for external timer ICs while guaranteeing fail-safe recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720AUTSHD5+T | 280ms minimum reset timeout vs. 210ms; same thresholds, package, and features | Suitable where longer reset hold is required for slower power supplies or complex FPGA configuration | Select when extended reset duration improves system stability without changing layout or firmware |
| MAX6720AUTSHD3-T | Leaded (Pb) packaging vs. lead-free (+T); identical electrical specs and pinout | Required for legacy manufacturing lines not certified for Pb-free assembly or RoHS-exempt applications | Choose only if Pb-free compliance is not mandated and existing solder process relies on SnPb eutectic profile |
Compared with MAX6720AUTSHD3+T, the MAX6720AUTSHD5+T offers longer reset assertion for marginal power supplies, while the MAX6720AUTSHD3-T provides identical functionality in leaded packaging-neither is pin-compatible with non-MAX6720 variants due to unique threshold and timeout coding in the suffix.
Availability
MAX6720AUTSHD3+T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, telecom line cards, and embedded network routers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6720AUTSHD3+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, computing, and communications applications.
The MAX6715–MAX6729 family delivers ultra-low-voltage, multirail supervisory functions in miniature SOT23 packages, targeting space- and power-constrained systems needing robust power-on reset, brownout detection, and watchdog safety.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6720AUTSHD3+T?
The MAX6720AUTSHD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (falling), specified with ±125mV tolerance per the Reset Voltage Threshold Suffix Guide. This value is laser-trimmed during production and does not require external components. The MAX6720AUTSHD3+T maintains this threshold across its full operating temperature range (-40°C to +85°C) with a tempco of 20ppm/°C.
Does the MAX6720AUTSHD3+T support monitoring a negative supply voltage?
Yes-the MAX6720AUTSHD3+T can monitor negative supplies using the RSTIN pin with an appropriate resistor-divider network configured per Figure 3a/b in the datasheet. Since RSTIN compares the applied voltage to a fixed 626mV internal reference, connecting a negative rail through a divider allows trip-point setting. The MAX6720AUTSHD3+T itself must be powered by positive VCC1/VCC2 supplies; RSTIN input current remains within ±25nA across the full common-mode range.
What is the function of the "D3" suffix in MAX6720AUTSHD3+T?
The "D3" suffix in MAX6720AUTSHD3+T specifies a minimum reset timeout period of 210ms, per the Reset Timeout Period Suffix Guide. This is a factory-programmed timing parameter implemented via on-chip RC elements and is independent of external components. The D3 timeout applies to all reset sources: VCC1/VCC2 undervoltage, RSTIN fault, manual reset (MR), and watchdog timeout events.
Can the MAX6720AUTSHD3+T operate with VCC1 = 1.8V and VCC2 = 1.2V simultaneously?
Yes-the MAX6720AUTSHD3+T is fully specified to operate with VCC1 as low as 1.8V and VCC2 as low as 0.9V, including simultaneous operation at 1.8V/1.2V. Its internal comparators and reset logic remain functional, and the push-pull RST output is guaranteed to drive low with VOL ≤ 0.3V at ISINK = 100µA. Supply current is 14µA typical at these voltages, supporting ultra-low-power designs.
Is the manual reset input (MR) on the MAX6720AUTSHD3+T compatible with 1.8V logic levels?
Yes-the MR input on the MAX6720AUTSHD3+T accepts standard CMOS/TTL logic levels: VIH ≥ 0.7 × VCC1 and VIL ≤ 0.3 × VCC1. With VCC1 = 1.8V, this translates to VIH ≥ 1.26V and VIL ≤ 0.54V, making it compatible with 1.8V GPIOs. The internal 50kΩ pullup ensures MR defaults high when unconnected, and the 1µs minimum pulse width requirement is easily met by modern microcontrollers.
MAX6720AUTSHD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Cut Tape (CT)
- 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+T FAQ
1.How can I place an order for MAX6720AUTSHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6720AUTSHD3+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 MAX6720AUTSHD3+T reliable?
The price and inventory of MAX6720AUTSHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6720AUTSHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6720AUTSHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6720AUTSHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6720AUTSHD3+T?
MAX6720AUTSHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6720AUTSHD3+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 MAX6720AUTSHD3+T?
For technical support, including MAX6720AUTSHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6720AUTSHD3+T requirements.
6.How does Aetrix verify that MAX6720AUTSHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6720AUTSHD3+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 MAX6720AUTSHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6720AUTSHD3+T?
All MAX6720AUTSHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6720AUTSHD3+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 MAX6720AUTSHD3+T part is unused and in its original packaging.
Return procedure for MAX6720AUTSHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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