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Analog Devices Inc./Maxim Integrated MAX6720UTLTD3+
- Part No.:
- MAX6720UTLTD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6720UTLTD3+.pdf
- Description:
- MAX6720UTLTD3+
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Product details
Overview
MAX6720UTLTD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, watchdog timer, manual reset input, and guaranteed reset validity down to 0.8V supply - used in telecom power sequencing and embedded system brownout protection.
For engineers reviewing the MAX6720UTLTD3+ datasheet, MAX6720UTLTD3+ pinout, MAX6720UTLTD3+ application, or MAX6720UTLTD3+ equivalent, key selection factors include dual-supply threshold accuracy (±1.5% over temperature), ultra-low 14µA supply current at 3.6V, push-pull RST output referenced to VCC1, and immunity to sub-20µs VCC transients.
Technical Context
The MAX6720UTLTD3+ integrates two independent voltage comparators with factory-trimmed thresholds (VTH1 = 4.625V, VTH2 = 3.075V), a 210ms minimum reset timeout timer, and a dual-mode watchdog (35s startup / 1.12s normal). It asserts active-low push-pull RST when either VCC1 or VCC2 falls below its threshold or MR is pulled low.
Its RSTIN input is unused in this variant (no third-voltage monitoring), and it lacks PFI/PFO functionality. The device operates across -40°C to +85°C, guarantees valid reset logic down to VCC1 or VCC2 = 0.8V, and features 20ppm/°C reset threshold tempco and 0.5% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over -40°C to +85°C) - sets primary supply brownout detection point for 5V or 4.8V rails |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over -40°C to +85°C) - enables reliable monitoring of 3.3V I/O or auxiliary supplies |
| Reset Timeout | 210ms (minimum) - ensures sufficient hold time for processor initialization after power recovery |
| Supply Current | 14µA typical at 3.6V - minimizes quiescent load on battery-backed or low-power systems |
| Reset Output Type | Push-pull active-low RST referenced to VCC1 - eliminates need for external pullup and drives directly into µP reset pin |
| Operating Temp | -40°C to +85°C - qualified for industrial and telecom equipment environments |
| VCC Validity Limit | Guaranteed reset logic state down to VCC1 or VCC2 = 0.8V - supports deep brownout detection without external supervision |
Pinout & Package
MAX6720UTLTD3+ uses a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch), surface-mount, RoHS-compliant lead-free (+T suffix) construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low during fault and holds for 210ms post-recovery |
| 2 | GND | System ground reference for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; pulse ≥1µs forces full reset sequence |
| 4 | VCC2 | Secondary supply input (monitored at 3.075V); powers internal circuitry when > VCC1 and enables VCC2 fault detection |
| 5 | VCC1 | Primary supply input (monitored at 4.625V); main power source and reference for RST output voltage level |
| 6 | NC | No connect - internally unconnected; must be left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision with separate comparators and shared reset timeout |
| Push-pull RST output | Drives µP reset pin directly without external pullup; VOH ≥ 0.8×VCC1 at 800µA, VOL ≤ 0.4V at 3.2mA |
| Manual reset with glitch rejection | MR input rejects <100ns noise pulses and requires ≥1µs low pulse to trigger reset - robust against PCB noise |
| Ultra-low supply current | 14µA typical at 3.6V enables use in always-on subsystems and battery-critical applications |
| Brownout immunity guarantee | Valid reset assertion and deassertion guaranteed down to VCC1 or VCC2 = 0.8V - no external undervoltage lockout needed |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Sequencing multiple DC-DC outputs (5V, 3.3V, 1.8V) in base station line cards where out-of-spec VCC2 must halt boot before FPGA configuration. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RST until both VCC1 ≥ 4.625V and VCC2 ≥ 3.075V are stable for ≥210ms. Use Value: Prevents partial initialization and latch-up by enforcing strict voltage order and timing - eliminates field failures from marginal rail transitions. |
Use Scenario: Protecting programmable logic controller backplane modules operating in harsh 0–70°C ambient with fluctuating 24V-derived 5V/3.3V rails. IC Role / Device Role / Timing Role: Monitoring primary (5V) and secondary (3.3V) supplies; MR input allows operator-initiated safe shutdown via front-panel button. Use Value: Enables deterministic restart after transient dips without requiring µP firmware intervention - improves MTBF in dusty/vibrating environments. |
| Network Router Control Plane | Medical Diagnostic Handheld |
|
Use Scenario: Ensuring clean boot of ARM-based control CPU in Layer 3 routers where 5V core and 3.3V PHY rails may sag independently during hot-swap events. IC Role / Device Role / Timing Role: Independent VCC1/VCC2 comparators feeding single RST output with 210ms timeout - detects asymmetric brownouts missed by single-rail supervisors. Use Value: Avoids silent corruption of routing tables by catching VCC2-only faults that would otherwise pass undetected by VCC1-only monitoring. |
Use Scenario: Battery-powered ultrasound probe with Li-ion (3.6V nominal) feeding buck-boost to generate 5V (VCC1) and 3.3V (VCC2) for SoC and sensor interface. IC Role / Device Role / Timing Role: Supervising both regulated rails; low 14µA ICC extends battery life while ensuring reset during discharge below 3.2V (VCC1) or 2.8V (VCC2). Use Value: Guarantees safe shutdown before data loss or flash corruption - meets IEC 62304 Class B software safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V VDD threshold only; no VDD2 monitor; 200ms timeout; open-drain RST | Single-rail systems; requires external pullup; lower quiescent current (1.1µA) | Select when only primary rail supervision is needed and board space permits pullup resistor |
| ADM6710SARUZ-REEL7 | Adjustable V1/V2 thresholds via external resistors; 200ms timeout; push-pull RST; wider temp range (-40°C to +125°C) | Designs requiring custom thresholds or extended temperature operation | Select when factory-trimmed thresholds are insufficient or automotive-grade temp range is required |
Compared with TPS3808G33DBVR and ADM6710SARUZ-REEL7, MAX6720UTLTD3+ provides factory-matched dual thresholds (4.625V/3.075V) with push-pull RST in the smallest footprint (SOT23-6), eliminating design iteration on resistor networks while ensuring precise rail coordination without layout compromises.
Availability
MAX6720UTLTD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical handheld devices requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6720UTLTD3+ 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, sensing, and interface applications, with emphasis on reliability and integration for demanding industrial and communications systems.
The MAX6715–MAX6729 family delivers compact, ultra-low-power supervisory solutions optimized for multivoltage embedded systems where simultaneous monitoring of primary and secondary rails prevents erratic behavior during power transients.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6720UTLTD3+?
The MAX6720UTLTD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over the full -40°C to +85°C temperature range. These values are fixed by the "LT" suffix per Maxim's Reset Voltage Threshold Suffix Guide and do not require external resistor programming. The MAX6720UTLTD3+ does not support adjustable RSTIN monitoring.
Does the MAX6720UTLTD3+ include a watchdog timer function?
Yes, the MAX6720UTLTD3+ includes a dual-mode watchdog timer with a 35s minimum startup period and 1.12s minimum normal timeout period. The WDI input is present and functional per the MAX6720's position in the Selector Guide. Watchdog operation begins after reset release and responds to rising/falling edges on WDI.
What is the reset output type and drive capability of the MAX6720UTLTD3+?
The MAX6720UTLTD3+ features a push-pull active-low RST output referenced to VCC1. It sources ≥0.8×VCC1 at 800µA and sinks ≤0.4V at 3.2mA, enabling direct connection to most µP reset pins without external pullup resistors. This differs from open-drain variants like MAX6719 which require external pullups.
Can the MAX6720UTLTD3+ monitor a third voltage using the RSTIN pin?
No, the MAX6720UTLTD3+ does not use the RSTIN pin for third-voltage monitoring. Per the Selector Guide and Pin Description, RSTIN functionality is only enabled in MAX6719/MAX6720 variants with specific suffixes indicating RSTIN enablement - the MAX6720UTLTD3+ is configured as dual-supply only, and RSTIN is internally disconnected.
What is the minimum supply voltage at which the MAX6720UTLTD3+ guarantees correct reset logic state?
The MAX6720UTLTD3+ guarantees valid reset output logic (high/low state integrity) down to VCC1 or VCC2 = 0.8V, as explicitly specified in the Absolute Maximum Ratings and Detailed Description sections. This ensures reliable brownout detection even during deep supply sags where other supervisors may fail silently.
MAX6720UTLTD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6720UTLTD3+ FAQ
1.How can I place an order for MAX6720UTLTD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6720UTLTD3+ 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 MAX6720UTLTD3+ reliable?
The price and inventory of MAX6720UTLTD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6720UTLTD3+ is usually 5 days.
3.What payment methods are accepted for MAX6720UTLTD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6720UTLTD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6720UTLTD3+?
MAX6720UTLTD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6720UTLTD3+ 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 MAX6720UTLTD3+?
For technical support, including MAX6720UTLTD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6720UTLTD3+ requirements.
6.How does Aetrix verify that MAX6720UTLTD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6720UTLTD3+ 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 MAX6720UTLTD3+ meets industry standards.
7.What is the process for return or replacement of MAX6720UTLTD3+?
All MAX6720UTLTD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6720UTLTD3+, 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 MAX6720UTLTD3+ part is unused and in its original packaging.
Return procedure for MAX6720UTLTD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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