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Analog Devices Inc./Maxim Integrated MAX6732UTVDD3+T
- Part No.:
- MAX6732UTVDD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6732UTVDD3+T.pdf
- Description:
- IC SUPERVISOR UP SUP CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6732UTVDD3+T from Maxim Integrated is a dual-voltage microprocessor supervisor IC with active-low open-drain reset and watchdog outputs, factory-set VCC1 = +3.075V and VCC2 = +2.313V thresholds, 210ms (typ) reset timeout, and -40°C to +85°C operation - used to ensure reliable power-on initialization and fault recovery in multivoltage embedded systems.
For engineers reviewing the MAX6732UTVDD3+T datasheet, MAX6732UTVDD3+T pinout, MAX6732UTVDD3+T application, or MAX6732UTVDD3+T equivalent, key selection factors include dual-supply monitoring capability, open-drain RST/WDO compatibility with legacy μP reset interfaces, watchdog startup delay (35s min), low 14μA supply current, and SOT23-6 package footprint constraints.
Technical Context
The MAX6732UTVDD3+T monitors two fixed supply rails (VCC1 and VCC2) using independent internal voltage comparators referenced to precision bandgap-derived thresholds. It asserts an active-low open-drain RST output when either supply falls below its preset threshold or when the watchdog timer expires due to missing WDI transitions.
Its watchdog operates in dual-mode: a 35s minimum initial timeout after reset enables full system boot, followed by a 1.12s minimum normal-mode timeout for rapid fault detection. The device guarantees valid reset assertion down to VCC1 or VCC2 = +0.8V and features immunity to sub-100ns VCC transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (factory-set, falling edge; ±12.5mV tolerance) |
| VCC2 Reset Threshold | +2.313V (factory-set, falling edge; ±12.5mV tolerance) |
| Reset Timeout Period | 210ms (typical; D3 suffix = 140–280ms range) |
| Supply Current | 14μA (typ at +3.6V; enables battery-backed operation) |
| Watchdog Timeout (Normal) | 1.12s (min; ensures rapid lockup detection post-initialization) |
| Watchdog Startup Delay | 35s (min after reset; accommodates complex boot sequences) |
| Operating Temperature | -40°C to +85°C (fully specified; suitable for industrial environments) |
Pinout & Package
MAX6732UTVDD3+T is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), with 1.6mm × 2.9mm footprint, 0.95mm height, and gull-wing leads. Thermal resistance θJA = 230°C/W on standard 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-Low Reset Output | Open-drain output requiring external pullup; asserts low on VCC1/VCC2 undervoltage or WDI timeout |
| GND | Ground Reference | Common return path for all internal circuitry and comparator references |
| WDO | Active-Low Watchdog Output | Open-drain watchdog flag; deasserts only after valid WDI transition and stable supplies |
| VCC1 | Primary Supply Input | Power source and monitored rail for first reset threshold (+3.075V) |
| WDI | Watchdog Input | Edge-sensitive input; clears watchdog timer on rising/falling transition within timeout window |
| VCC2 | Secondary Supply Input | Monitored rail for second reset threshold (+2.313V); powers internal comparator stage |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneously supervises +3.075V and +2.313V rails without external resistors |
| Open-drain RST and WDO outputs | Enables wired-OR reset bus sharing and compatibility with bidirectional μP reset pins |
| Guaranteed reset validity down to +0.8V | Ensures clean reset assertion during brownout conditions before full power collapse |
| Immunity to short VCC transients | Rejects <100ns glitches, preventing spurious resets in noisy power environments |
| Low 14μA quiescent current | Extends battery life in portable equipment and enables always-on supervision |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring +3.3V control logic and +2.5V FPGA configuration rails in telecom line cards. IC Role / Device Role / Timing Role: Dual-rail supervisor providing synchronized reset to μP and FPGA upon either rail failure. Use Value: Prevents partial configuration or corrupted state during asymmetric supply faults. |
Use Scenario: Ensuring deterministic startup of programmable logic controllers after AC/DC converter stabilization. IC Role / Device Role / Timing Role: Supervises primary +3.3V logic supply and secondary +2.3V analog sensor interface rail. Use Value: Eliminates need for discrete RC reset circuits and improves cold-start reliability. |
| Network Router Control Plane | Medical Diagnostic Equipment |
Use Scenario: Validating stable +3.0V CPU core and +2.3V PHY interface voltages before enabling packet forwarding. IC Role / Device Role / Timing Role: Dual-threshold supervisor triggering hardware reset if either rail drops below specification during thermal stress. Use Value: Reduces field failures caused by marginal power delivery under load. |
Use Scenario: Securing safe boot sequence in portable ultrasound devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: Monitors main +3.075V system rail and backup +2.313V real-time clock domain. Use Value: Guarantees clinical data integrity by enforcing full reset on any supply anomaly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6732UTLTD3+T | VCC1 = +4.625V, VCC2 = +3.075V (higher thresholds) | Suitable for +5V/+3.3V systems instead of +3.3V/+2.5V | Select when monitoring higher nominal rails; same pinout and timing |
| TPS3808G33DBVR | Single-supply monitor (3.3V only), push-pull RST, no WDO output | Lacks dual-rail capability and independent watchdog flag | Use only if single-rail supervision suffices and watchdog signaling is handled elsewhere |
Compared with MAX6732UTLTD3+T, the MAX6732UTVDD3+T provides lower reset thresholds optimized for modern low-voltage logic domains; compared with TPS3808G33DBVR, it delivers essential dual-rail coverage and dedicated WDO signaling critical for safety-critical boot validation.
Availability
MAX6732UTVDD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical electronics requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6732UTVDD3+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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6730–MAX6735 family was engineered specifically for robust multivoltage supervision in space-constrained embedded systems, emphasizing low power, glitch immunity, and dual-mode watchdog reliability.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6732UTVDD3+T?
The MAX6732UTVDD3+T has a factory-set VCC1 reset threshold of +3.075V (nominal), with guaranteed limits of +3.000V (min) and +3.150V (max) at TA = -40°C to +85°C. This value corresponds to the "TZ" suffix in Maxim's Reset Voltage Threshold Suffix Guide and is laser-trimmed during production for high accuracy.
Does the MAX6732UTVDD3+T support manual reset functionality?
No, the MAX6732UTVDD3+T does not include a manual reset (MR) input. Per the Selector Guide and Pin Description, MR is omitted in the MAX6732/MAX6733 variants. Only MAX6730, MAX6731, MAX6734, and MAX6735 provide MR capability - the MAX6732UTVDD3+T relies solely on voltage monitoring and watchdog-triggered reset.
What is the watchdog startup delay and how does it affect system boot?
The MAX6732UTVDD3+T features a 35s minimum watchdog startup delay after any reset event (power-up, brownout, or watchdog timeout). This extended initial period allows complete firmware initialization and peripheral configuration before watchdog enforcement begins, preventing false timeouts during lengthy boot sequences.
Can the MAX6732UTVDD3+T monitor a third voltage rail?
No, the MAX6732UTVDD3+T is a dual-voltage supervisor and lacks the RSTIN input required for adjustable third-rail monitoring. That function is exclusive to the MAX6734/MAX6735 variants. The MAX6732UTVDD3+T monitors only VCC1 and VCC2 with fixed thresholds.
What package type and RoHS status does the MAX6732UTVDD3+T use?
The MAX6732UTVDD3+T uses a 6-pin SOT23-6 package (outline 21-0058) with lead(Pb)-free, RoHS-compliant construction indicated by the "+" suffix. It has a 1.6mm × 2.9mm body, 0.95mm max height, and gull-wing leads compatible with standard reflow profiles.
MAX6732UTVDD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 0.788V, 1.575V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6732UTVDD3+T FAQ
1.How can I place an order for MAX6732UTVDD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6732UTVDD3+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 MAX6732UTVDD3+T reliable?
The price and inventory of MAX6732UTVDD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6732UTVDD3+T is usually 5 days.
3.What payment methods are accepted for MAX6732UTVDD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6732UTVDD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6732UTVDD3+T?
MAX6732UTVDD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6732UTVDD3+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 MAX6732UTVDD3+T?
For technical support, including MAX6732UTVDD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6732UTVDD3+T requirements.
6.How does Aetrix verify that MAX6732UTVDD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6732UTVDD3+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 MAX6732UTVDD3+T meets industry standards.
7.What is the process for return or replacement of MAX6732UTVDD3+T?
All MAX6732UTVDD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6732UTVDD3+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 MAX6732UTVDD3+T part is unused and in its original packaging.
Return procedure for MAX6732UTVDD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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