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Analog Devices Inc./Maxim Integrated MAX6720UTZWD3+T
- Part No.:
- MAX6720UTZWD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6720UTZWD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,031
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Product details
Overview
The MAX6720UTZWD3+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 (626.5mV reference). It asserts an active-low push-pull reset for 210ms (min) after any supply drop, supports manual reset and watchdog timer, and operates from -40°C to +85°C. It is used in multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.
For engineers reviewing the MAX6720UTZWD3+T datasheet, MAX6720UTZWD3+T pinout, MAX6720UTZWD3+T application, or MAX6720UTZWD3+T equivalent, key selection criteria include its dual-supply monitoring with factory-trimmed thresholds, 210ms reset timeout, push-pull RST output referenced to VCC1, 14µA typical supply current at 3.6V, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V.
Technical Context
This device implements a dual-threshold voltage monitor with independent VCC1 and VCC2 inputs, plus a high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap. Its reset logic combines asynchronous fault detection (VCC1/VCC2/RSTIN undervoltage, MR low, or WDI timeout) with a deterministic 210ms minimum timeout period after recovery.
The integrated watchdog features a dual-mode timer: 35s minimum startup period after reset, followed by 1.12s minimum normal timeout upon first WDI edge detection. The push-pull RST output is driven from VCC1 and guarantees VOL ≤ 0.4V at ISINK = 3.2mA, while remaining valid down to VCC1 = 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±125mV tolerance); ensures reliable reset assertion during 5V rail brownout |
| VCC2 Threshold | 3.075V (factory-trimmed, ±75mV tolerance); monitors 3.3V I/O supply with tight margin |
| RSTIN Reference | 626.5mV (internal bandgap); enables precise external monitoring of auxiliary supplies ≥0.62V via resistor divider |
| Reset Timeout | 210ms (min); provides sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14µA (typ at 3.6V); minimizes quiescent load on battery-backed or low-power rails |
| Watchdog Period | 1.12s (min normal mode); detects software hangs without excessive latency or false triggers |
| Operating Temp | -40°C to +85°C; qualified for industrial and telecom equipment environments |
Pinout & Package
MAX6720UTZWD3+T is housed in a 6-pin SOT23-6 package with gull-wing leads, 1.27mm pitch, and 2.9mm × 1.6mm footprint. Pin 1 is marked with a dot; device orientation follows JEDEC MO-178.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; drives low to reset µP until timeout expires |
| 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; debounced by design, no external RC needed |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal VCC2 monitor and RST2 if present (not used in MAX6720) |
| 5 | RSTIN | High-impedance adjustable reset input; asserts reset when voltage falls below 626.5mV reference |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers core logic, VCC1 monitor, and RST output driver |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage thresholds | VCC1 = 4.625V and VCC2 = 3.075V eliminate external resistor networks and calibration effort |
| Externally adjustable third-voltage monitor | RSTIN input with 626.5mV reference enables monitoring of auxiliary rails (e.g., 1.2V core, 1.8V memory) using two standard resistors |
| Push-pull reset output | RST pin drives actively high/low without external pullup, simplifying interface to µP reset pins and reducing BOM count |
| Dual-mode watchdog timer | 35s startup window allows full system boot before enabling 1.12s runtime supervision, preventing false resets during initialization |
| Guaranteed reset validity down to 0.8V | Ensures correct reset state even during deep brownout conditions where VCC1 or VCC2 dips near 0.8V |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
Use Scenario: Monitors 5V main rail, 3.3V I/O rail, and 1.2V FPGA core supply in a DIN-rail mounted controller exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset assertion, manual recovery via front-panel button, and watchdog supervision of firmware execution. Use Value: Prevents corrupted state during partial power loss; 210ms timeout ensures FPGA configuration completes before release; push-pull RST eliminates need for external pullup on isolated reset bus. | Use Scenario: Ensures clean boot and runtime integrity in multi-rail PoE-powered Ethernet switch with 48V-to-12V/5V/3.3V/1.2V DC/DC conversion chain. IC Role / Device Role / Timing Role: Supervises primary 5V and secondary 3.3V rails while using RSTIN to monitor 1.2V CPU core voltage; integrates with system watchdog via WDI. Use Value: Detects undervoltage on critical core rail before logic failure occurs; 14µA supply current minimizes standby drain; 35s watchdog startup accommodates complex PHY initialization sequences. |
| Battery-Powered Medical Monitor | Set-Top Box Mainboard |
Use Scenario: Manages power sequencing and fault response in portable ECG device powered by Li-ion battery (3.0–4.2V) with regulated 3.3V and 1.8V rails. IC Role / Device Role / Timing Role: Monitors battery-derived VCC1 (3.3V), LDO output VCC2 (1.8V), and RSTIN-connected battery voltage divider to detect end-of-life discharge. Use Value: 626.5mV RSTIN reference enables accurate low-battery warning at 3.0V; 0.8V reset validity ensures safe shutdown even during rapid battery sag; ultra-low 14µA ICC extends runtime. | Use Scenario: Provides robust reset control in consumer STB with multiple SoC voltage domains (5V, 3.3V, 1.2V) and thermal throttling events. IC Role / Device Role / Timing Role: Dual-supply monitor (VCC1=5V, VCC2=3.3V) with RSTIN tied to 1.2V core rail; MR connected to IR receiver for remote-initiated reboot. Use Value: Factory-trimmed thresholds eliminate calibration drift over temperature; push-pull RST drives SoC reset pin directly without level-shifting; 210ms timeout exceeds typical DDR initialization time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720UTZTD3+T | Same package and pinout, but open-drain RST output instead of push-pull; requires external pullup resistor | Suitable for systems needing wired-OR reset buses or level translation to lower-voltage logic | Select when interfacing to bidirectional µP reset pins or shared reset lines where active pull-down is required |
| TPS3808G33DBVR | Single-supply monitor (3.3V threshold only); no RSTIN or watchdog; 200ms timeout; SOT23-6 package | Lacks triple-monitoring and advanced features; simpler BOM for basic 3.3V-only applications | Choose for cost-sensitive designs with only one monitored rail and no need for manual reset or watchdog supervision |
Compared with MAX6720UTZWD3+T, the MAX6720UTZTD3+T offers identical monitoring capability but requires external biasing for RST, while TPS3808G33DBVR reduces feature set and cost for single-rail use cases-neither is pin-compatible, but both serve adjacent design requirements with verified electrical equivalence in their respective operating scopes.
Availability
MAX6720UTZWD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, battery-powered medical monitors, and set-top box mainboards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6720UTZWD3+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 MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervisory circuits optimized for space-constrained embedded systems requiring simultaneous monitoring of primary, secondary, and auxiliary power domains with minimal external components.
FAQ
What is the exact reset timeout period of the MAX6720UTZWD3+T?
The MAX6720UTZWD3+T has a guaranteed minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number. This is the duration for which the active-low RST output remains asserted after all monitored supplies (VCC1, VCC2, RSTIN) rise above their respective thresholds, or after MR returns high. Typical value is 210ms, with maximum specified at 280ms over temperature.
Does the MAX6720UTZWD3+T support monitoring a third voltage, and how is it configured?
Yes, the MAX6720UTZWD3+T supports third-voltage monitoring via the RSTIN pin, which compares the applied voltage against an internal 626.5mV reference. To monitor a higher voltage (e.g., 1.2V), connect a resistor divider between the target rail and GND, with the midpoint fed to RSTIN. The threshold is set by VEXT_TH = 626.5mV × (R1 + R2)/R2, enabling precise undervoltage detection for auxiliary supplies.
What type of reset output does the MAX6720UTZWD3+T provide, and what are its drive characteristics?
The MAX6720UTZWD3+T provides an active-low push-pull reset output (RST pin), referenced to VCC1. It guarantees VOL ≤ 0.4V at ISINK = 3.2mA when asserted, and VOH ≥ 0.8 × VCC1 when deasserted with ISOURCE = 800µA. This eliminates the need for an external pullup resistor and ensures direct compatibility with most µP reset inputs.
How does the watchdog timer function in the MAX6720UTZWD3+T, and what are its timing modes?
The MAX6720UTZWD3+T features a dual-mode watchdog timer: after any reset event, it enters a 35s minimum startup period to allow full system boot, then transitions to a 1.12s minimum normal timeout mode upon detection of the first WDI edge. This prevents false timeouts during initialization while ensuring rapid response to software hangs during steady-state operation.
Is the MAX6720UTZWD3+T guaranteed to operate correctly at very low supply voltages?
Yes, the MAX6720UTZWD3+T is guaranteed to maintain valid reset output logic states down to VCC1 or VCC2 = 0.8V. This ensures reliable brownout detection and reset assertion even during severe supply sags, supporting robust operation in battery-powered or poorly regulated systems where rail collapse may occur.
MAX6720UTZWD3+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:
- 1.665V, 2.313V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6720UTZWD3+T FAQ
1.How can I place an order for MAX6720UTZWD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6720UTZWD3+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 MAX6720UTZWD3+T reliable?
The price and inventory of MAX6720UTZWD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6720UTZWD3+T is usually 5 days.
3.What payment methods are accepted for MAX6720UTZWD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6720UTZWD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6720UTZWD3+T?
MAX6720UTZWD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6720UTZWD3+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 MAX6720UTZWD3+T?
For technical support, including MAX6720UTZWD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6720UTZWD3+T requirements.
6.How does Aetrix verify that MAX6720UTZWD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6720UTZWD3+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 MAX6720UTZWD3+T meets industry standards.
7.What is the process for return or replacement of MAX6720UTZWD3+T?
All MAX6720UTZWD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6720UTZWD3+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 MAX6720UTZWD3+T part is unused and in its original packaging.
Return procedure for MAX6720UTZWD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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