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Analog Devices Inc./Maxim Integrated MAX6720AUTLTD3+T
- Part No.:
- MAX6720AUTLTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6720AUTLTD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,195
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Product details
Overview
MAX6720AUTLTD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory IC monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) supply rails. It asserts an active-low push-pull reset output when any monitored voltage falls below its factory-trimmed threshold (VTH1 = 4.625 V, VTH2 = 3.075 V, VRSTIN = 626.5 mV), with guaranteed reset validity down to VCC1 or VCC2 = 0.8 V and a 210 ms (min) reset timeout period. It supports manual reset, watchdog timer, and operates in -40°C to +85°C industrial environments.
For engineers reviewing the MAX6720AUTLTD3+T datasheet, MAX6720AUTLTD3+T pinout, MAX6720AUTLTD3+T application, or MAX6720AUTLTD3+T equivalent, this page delivers verified specifications, validated pin functions, confirmed dual-supply supervision with adjustable third-rail monitoring, and real-world selection guidance for multivoltage embedded systems requiring reliable power-on reset and brownout protection.
Technical Context
The MAX6720AUTLTD3+T implements independent dual-threshold comparators for VCC1 and VCC2, plus a dedicated high-impedance RSTIN input referenced to a 626.5 mV internal bandgap reference. Its push-pull RST output is driven from VCC1 and remains valid even as VCC1 or VCC2 drops to 0.8 V - enabling robust reset assertion during deep brownouts.
This device integrates a dual-mode watchdog timer (35 s startup / 1.12 s normal mode), manual reset with 50 kΩ internal pullup, and supports system-level power-fail detection via optional PFI/PFO when configured per family variants - though MAX6720AUTLTD3+T itself excludes PFI/PFO functionality per Selector Guide.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625 V (typ), factory-trimmed - ensures precise primary supply monitoring for 5 V or 4.8 V logic rails |
| VCC2 Reset Threshold | 3.075 V (typ), factory-trimmed - matches common secondary supplies like 3.3 V I/O or memory rails |
| RSTIN Threshold | 626.5 mV (typ), internal reference - enables external resistor-divider to monitor third rail down to 0.62 V |
| Reset Timeout Period | 210 ms (min) - provides sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14 µA (typ) at 3.6 V - ultra-low quiescent current extends battery life in portable equipment |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom-grade environmental reliability |
| Reset Output Type | Active-low push-pull - eliminates need for external pullup and drives directly into µP reset pins |
Pinout & Package
MAX6720AUTLTD3+T is housed in a 6-pin SOT23-6 package (2.9 mm × 1.6 mm × 1.1 mm), optimized for space-constrained PCB layouts while maintaining thermal performance across industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on fault and holds for 210 ms minimum after recovery |
| 2 | GND | Analog/digital ground reference for all internal comparators and logic - must be low-impedance connection |
| 3 | MR | Active-low manual reset input with 50 kΩ internal pullup to VCC1; pulse ≥1 µs forces full reset sequence |
| 4 | VCC2 | Secondary supply input (0.9 V–3.3 V); powers internal VCC2 comparator and sets RST2 reference if enabled |
| 5 | VCC1 | Primary supply input (1.8 V–5.0 V); powers core circuitry, drives RST output, and sets main reset threshold |
| 6 | RSTIN | High-impedance auxiliary monitor input; compares against 626.5 mV reference to enable third-voltage supervision |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed thresholds | VTH1 = 4.625 V and VTH2 = 3.075 V - eliminates external resistor networks for standard 5 V/3.3 V systems |
| Adjustable third-rail monitoring | RSTIN with 626.5 mV reference and ±25 nA input leakage - supports precision monitoring of sub-1 V rails using high-R dividers |
| Guaranteed reset down to 0.8 V | Valid RST assertion even as VCC1 or VCC2 collapses to 0.8 V - prevents spurious release during brownout recovery |
| Low supply current | 14 µA typical at 3.6 V - reduces system standby power by >50% vs. legacy supervisors |
| Push-pull RST output | No external pullup required; VOH ≥ 0.8 × VCC1 at 800 µA source - simplifies interface to bidirectional µP reset pins |
Applications
| Industrial PLC Power Sequencing | 5G Small Cell Baseband Supply Monitoring |
|---|---|
Use Scenario: Monitoring primary 3.3 V FPGA core rail and secondary 1.8 V transceiver rail in edge-deployed programmable logic controllers. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting synchronized reset to FPGA and microcontroller upon either rail undervoltage. Use Value: Prevents configuration corruption during cold-start or brownout by enforcing 210 ms reset hold time and validating reset down to 0.8 V on both rails. |
Use Scenario: Ensuring reliable boot sequencing for baseband SoC and RF front-end in compact 5G small cell units powered from shared DC-DC converters. IC Role / Device Role / Timing Role: Triple-supply monitor tracking 5 V bias, 3.3 V control, and 1.2 V digital core via RSTIN divider - triggering unified reset on first fault. Use Value: Eliminates need for three discrete supervisors; 14 µA quiescent current minimizes standby drain in always-on infrastructure equipment. |
| Medical Point-of-Care Diagnostic Device | Automotive Infotainment Head Unit |
Use Scenario: Supervising battery-backed 3.3 V MCU rail and isolated 2.5 V sensor interface rail in portable diagnostic instruments with strict safety reset requirements. IC Role / Device Role / Timing Role: Fault-detecting supervisor with manual reset (MR) for technician-initiated recalibration and watchdog (WDI) for firmware hang detection. Use Value: Push-pull RST output ensures deterministic reset drive without pullup conflicts; MR glitch rejection (100 ns) prevents false triggers in noisy clinical environments. |
Use Scenario: Monitoring 5 V infotainment processor rail and 3.3 V display controller rail in automotive head units subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Brownout detector immune to short VCC transients (<20 µs at 100 mV overdrive), holding reset until stable post-crank. Use Value: Valid reset assertion down to VCC = 0.8 V prevents premature release during 6 V cold-crank events - critical for ASIL-B functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720AUTLTD5+T | 210 ms → 420 ms reset timeout; identical thresholds, package, and features | Requires longer reset hold time for complex SoC initialization sequences | Select when system boot firmware needs >210 ms to stabilize clocks and PLLs before releasing reset |
| TPS3808G33DBVR | Dual 3.3 V fixed threshold only; no RSTIN, no watchdog; 200 ms timeout; SOT23-6 | Lacks third-rail monitoring and system-level watchdog - suitable only for simple dual-rail systems | Choose for cost-sensitive designs where only 3.3 V/3.3 V supervision is needed and RSTIN/WDI are unused |
Compared with MAX6720AUTLTD3+T, the MAX6720AUTLTD5+T extends reset hold time for demanding processors, while the TPS3808G33DBVR offers lower cost and footprint at the expense of adjustable third-rail monitoring and watchdog capability - making it viable only in minimal dual-supply applications.
Availability
MAX6720AUTLTD3+T is available at Aetrix Electronics and suitable for industrial PLCs, 5G small cells, medical diagnostics, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed reset behavior under brownout conditions.
Supply support for MAX6720AUTLTD3+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) is a semiconductor leader specializing in high-performance 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, ultra-low-power supervision of primary, secondary, and auxiliary rails - with emphasis on guaranteed operation down to 0.8 V and flexible reset timing.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6720AUTLTD3+T?
The MAX6720AUTLTD3+T has a factory-trimmed VCC1 reset threshold of 4.625 V (typical), with tolerance of ±125 mV (4.500 V to 4.750 V) over temperature. This value is encoded in the "TL" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6720AUTLTD3+T variant - not the broader MAX6720 family.
Does MAX6720AUTLTD3+T include a watchdog timer function?
Yes, MAX6720AUTLTD3+T includes a dual-mode watchdog timer with a 35 s (min) startup period and 1.12 s (min) normal timeout period. The WDI pin monitors processor activity, and failure to toggle within the timeout asserts RST for the full 210 ms reset period - confirmed in the Selector Guide and Electrical Characteristics table.
Can MAX6720AUTLTD3+T monitor a 1.2 V supply as the third rail?
Yes, MAX6720AUTLTD3+T can monitor a 1.2 V supply using the RSTIN pin. With its 626.5 mV internal reference, a resistor divider (e.g., R1 = 100 kΩ, R2 = 110 kΩ) scales 1.2 V down to ~626 mV at RSTIN - enabling precise undervoltage detection while drawing only ≤25 nA from the monitored rail.
What is the reset output type and drive strength of MAX6720AUTLTD3+T?
MAX6720AUTLTD3+T features an active-low push-pull RST output referenced to VCC1. It sources ≥800 µA at VOH ≥ 0.8 × VCC1 and sinks ≥3.2 mA at VOL ≤ 0.4 V (VCC1 ≥ 4.5 V), eliminating external pullup components and ensuring direct compatibility with standard µP reset inputs.
Is MAX6720AUTLTD3+T compatible with lead-free PCB assembly processes?
Yes, MAX6720AUTLTD3+T carries the "+T" suffix indicating RoHS-compliant, lead-free packaging. It is rated for reflow soldering per JEDEC J-STD-020, with peak temperature tolerance up to +260°C - fully compatible with standard lead-free assembly lines and IPC-A-610 Class 2/3 requirements.
MAX6720AUTLTD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.075V, 4.625V, 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
MAX6720AUTLTD3+T FAQ
1.How can I place an order for MAX6720AUTLTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6720AUTLTD3+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 MAX6720AUTLTD3+T reliable?
The price and inventory of MAX6720AUTLTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6720AUTLTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6720AUTLTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6720AUTLTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6720AUTLTD3+T?
MAX6720AUTLTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6720AUTLTD3+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 MAX6720AUTLTD3+T?
For technical support, including MAX6720AUTLTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6720AUTLTD3+T requirements.
6.How does Aetrix verify that MAX6720AUTLTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6720AUTLTD3+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 MAX6720AUTLTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6720AUTLTD3+T?
All MAX6720AUTLTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6720AUTLTD3+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 MAX6720AUTLTD3+T part is unused and in its original packaging.
Return procedure for MAX6720AUTLTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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