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Analog Devices Inc./Maxim Integrated MAX6721UTSHD3+T
- Part No.:
- MAX6721UTSHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6721UTSHD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,488
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Product details
Overview
MAX6721UTSHD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (primary supply) and VCC2 (secondary supply) with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 210ms minimum reset timeout, watchdog timer support, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in telecom power management and industrial embedded systems.
For engineers reviewing the MAX6721UTSHD3+T datasheet, MAX6721UTSHD3+T pinout, MAX6721UTSHD3+T application, or MAX6721UTSHD3+T equivalent, key selection considerations include dual-supply monitoring capability, integrated watchdog input (WDI), push-pull RST output logic, and compatibility with low-voltage core/I/O rail sequencing in multivoltage systems.
Technical Context
The MAX6721UTSHD3+T implements independent voltage comparators for VCC1 and VCC2, each with ±0.5% threshold hysteresis and 20ppm/°C tempco, asserting active-low reset when either supply falls below its trimmed threshold. It features a dedicated watchdog input (WDI) with dual-mode timing: 35s minimum startup period followed by 1.12s minimum normal timeout.
Reset assertion is sustained for a guaranteed minimum 210ms after all monitored supplies recover above threshold, manual reset deassertion, or WDI transition. The device operates across -40°C to +85°C and maintains valid reset state even as VCC1 or VCC2 drops to 0.8V - critical for brownout detection in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), factory-trimmed - ensures reliable reset assertion on 5V system rails before undervoltage lockout |
| VCC2 Reset Threshold | 3.075V (typ), factory-trimmed - matches common 3.3V I/O supply tolerance band for coordinated reset timing |
| Reset Timeout Period | 210ms (min) - provides sufficient hold time for processor initialization and peripheral stabilization |
| Watchdog Timeout | 1.12s (min) normal mode - enables rapid fault detection during runtime without false triggers during boot |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent load on battery or low-power auxiliary rails |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and telecom equipment deployment environments |
| Package | SOT23-6 - surface-mount footprint compatible with high-density PCB layouts and automated assembly |
Pinout & Package
MAX6721UTSHD3+T is housed in a 6-pin SOT23-6 package with gull-wing leads, 0.95mm pitch, and JEDEC MO-178AC compliant dimensions (2.9mm × 1.6mm × 1.1mm). Pin 1 marked via dot; recommended reflow profile per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1 - drives µP reset pin directly without external pullup |
| 2 | GND | System ground reference for all internal comparators and logic - must be low-impedance connection |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1 - debounced by design; supports momentary switch to GND |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range) - powers internal VCC2 comparator and sets RST2 reference if enabled |
| 5 | WDI | Watchdog input - rising/falling edge clears internal timer; timeout asserts RST for full reset timeout period |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range) - powers device core, sets RST output reference, and enables VCC1 comparator |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1/VCC2 supervision with separate thresholds avoids single-point failure in split-rail systems |
| Integrated watchdog timer | Dual-mode timing (35s startup / 1.12s runtime) prevents premature timeout during boot while ensuring fast fault response in operation |
| Push-pull RST output | Eliminates need for external pullup resistor - reduces BOM count and improves noise immunity on reset line |
| Guaranteed reset validity to 0.8V | Ensures deterministic reset behavior during deep brownout conditions where VCC collapses below 1.0V |
| Immunity to short VCC transients | Withstands <20µs negative glitches at ≥100mV overdrive - prevents spurious resets in noisy power environments |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring 48V-to-5V/3.3V DC-DC converter outputs in base station power modules. IC Role / Device Role / Timing Role: Dual-supply supervisor coordinating reset assertion across primary (5V) and secondary (3.3V) rails during cold start and brownout events. Use Value: Prevents partial initialization of FPGA and PHY ICs by enforcing synchronized reset until both rails stabilize within spec. |
Use Scenario: Ensuring deterministic restart after AC mains interruption in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcer that holds CPU in reset until 24V and 5V supplies reach regulation and firmware completes self-test. Use Value: Eliminates metastability in I/O modules by guaranteeing reset remains asserted for ≥210ms post-recovery. |
| Server Management Controller | Battery-Powered Edge Gateway |
Use Scenario: Supervising BMC (Baseboard Management Controller) power rails (3.3V, 1.8V) alongside host CPU VRM outputs. IC Role / Device Role / Timing Role: Dual-threshold supervisor with WDI interface enabling BMC firmware to signal liveness and prevent hung-state lockup. Use Value: Enables autonomous recovery from firmware hangs without requiring chassis-level reset injection. |
Use Scenario: Monitoring Li-ion battery discharge (VCC1 = 3.6V nominal) and LDO output (VCC2 = 1.8V) in wireless sensor nodes. IC Role / Device Role / Timing Role: Low-quiescent-current (14µA) supervisor detecting end-of-life battery sag and triggering graceful shutdown via WDI timeout. Use Value: Extends usable battery life by avoiding unnecessary resets during transient load dips while catching true undervoltage faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6722UTSHD3+T | Push-pull RST output, identical VTH1/VTH2 (4.625V/3.075V) and tRP (210ms), but lacks WDI functionality | No watchdog capability - suitable only for systems without runtime firmware health monitoring | Select MAX6722UTSHD3+T when watchdog is unnecessary and cost reduction is prioritized |
| TPS3808G33DBVR | Single-supply monitor (3.3V threshold only), no VCC2 input, no WDI, 200ms timeout, 1.6µA IQ | Cannot supervise dual rails - requires additional IC for VCC1 monitoring or external divider for VCC2 tracking | Choose TPS3808G33DBVR only for single-rail 3.3V systems where ultra-low IQ outweighs dual-monitoring need |
Compared with MAX6722UTSHD3+T and TPS3808G33DBVR, the MAX6721UTSHD3+T uniquely combines dual-rail supervision, push-pull reset, and integrated watchdog in one SOT23-6 package - eliminating board space and interconnect complexity in multivoltage embedded designs.
Availability
MAX6721UTSHD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and server management applications requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6721UTSHD3+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 company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6715–MAX6729 family was designed specifically for multivoltage microprocessor systems needing compact, low-power, dual- or triple-supply supervision with configurable reset timing and watchdog safety features.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6721UTSHD3+T?
The MAX6721UTSHD3+T has factory-trimmed reset thresholds of 4.625V (VTH1) for VCC1 and 3.075V (VTH2) for VCC2, as indicated by the "SH" suffix in the part number per Maxim's Reset Voltage Threshold Suffix Guide. These values are specified at +25°C with ±1.5% tolerance over temperature and supply variation.
Does the MAX6721UTSHD3+T support watchdog functionality, and how is it configured?
Yes, the MAX6721UTSHD3+T includes a watchdog input (WDI) pin with dual-mode timing: a 35s minimum startup period after any reset event, followed by a 1.12s minimum normal timeout. A rising or falling edge on WDI clears the timer; failure to toggle within the timeout asserts RST for the full 210ms reset period.
What package type and pin count does the MAX6721UTSHD3+T use?
The MAX6721UTSHD3+T uses a 6-pin SOT23-6 package (JEDEC MO-178AC), with pin 1 marked by a dot. Its compact 2.9mm × 1.6mm footprint supports high-density PCB layouts and standard reflow soldering processes.
Is the reset output of the MAX6721UTSHD3+T open-drain or push-pull?
The MAX6721UTSHD3+T features a push-pull RST output (pin 1), referenced to VCC1. This eliminates the need for an external pullup resistor and provides stronger drive capability compared to open-drain alternatives - simplifying interface to most µP reset inputs.
Can the MAX6721UTSHD3+T monitor a third voltage rail?
No, the MAX6721UTSHD3+T is a dual-supply supervisor monitoring only VCC1 and VCC2. For triple-voltage monitoring, consider MAX6723UTSHD3+T or MAX6724UTSHD3+T - which add the RSTIN input for externally adjustable third-rail supervision down to 0.626V.
MAX6721UTSHD3+T 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:
- -
MAX6721UTSHD3+T FAQ
1.How can I place an order for MAX6721UTSHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6721UTSHD3+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 MAX6721UTSHD3+T reliable?
The price and inventory of MAX6721UTSHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6721UTSHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6721UTSHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6721UTSHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6721UTSHD3+T?
MAX6721UTSHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6721UTSHD3+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 MAX6721UTSHD3+T?
For technical support, including MAX6721UTSHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6721UTSHD3+T requirements.
6.How does Aetrix verify that MAX6721UTSHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6721UTSHD3+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 MAX6721UTSHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6721UTSHD3+T?
All MAX6721UTSHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6721UTSHD3+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 MAX6721UTSHD3+T part is unused and in its original packaging.
Return procedure for MAX6721UTSHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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