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Analog Devices Inc./Maxim Integrated MAX6732UTZWD3+T
- Part No.:
- MAX6732UTZWD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6732UTZWD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6732UTZWD3+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, 140–280ms reset timeout (D3), and -40°C to +85°C operation. It monitors two fixed supply rails in embedded systems requiring reliable power-on reset and system-level fault recovery.
For engineers reviewing the MAX6732UTZWD3+T datasheet, MAX6732UTZWD3+T pinout, MAX6732UTZWD3+T application, or MAX6732UTZWD3+T equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, dual-supply monitoring behavior, watchdog startup/normal timing, and real-world multivoltage system integration guidance - all confirmed against Maxim's official Rev 10 datasheet.
Technical Context
The MAX6732UTZWD3+T implements independent dual-threshold voltage monitoring with fixed VCC1 and VCC2 comparators referenced to internal precision references (±1.5% over temperature), each with 0.5% hysteresis. Its reset assertion logic combines ORed undervoltage detection across both supplies with a 140–280ms monostable timeout after threshold recovery.
It features a dual-mode watchdog timer: a 35s minimum initial startup delay post-reset followed by a 1.12s minimum normal-mode timeout, both triggered by WDI edge transitions. The open-drain RST and WDO outputs require external pullups and are specified down to VCC ≥ +0.8V for guaranteed reset validity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (factory-set, falling edge; ±1.5% tolerance) |
| VCC2 Reset Threshold | +2.313V (factory-set, falling edge; ±1.5% tolerance) |
| Reset Timeout Period | 140–280ms (D3 option; ensures sufficient hold time for processor initialization) |
| Watchdog Startup Delay | 35s min after reset; allows full system boot before watchdog enforcement |
| Normal Watchdog Timeout | 1.12s min; detects software lockup within sub-second response window |
| Supply Current | 15µA typ at +3.6V; enables low-power always-on supervision in battery-backed systems |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade embedded deployment |
Pinout & Package
MAX6732UTZWD3+T is housed in a 6-pin SOT23-6 package (outline 21-0058), footprint 90-0175, with 0.95mm pitch and JEDEC-compliant thermal characteristics (θJA = 230°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-low reset output | Open-drain output; requires external pullup; asserts low on VCC1/VCC2 undervoltage or timeout |
| GND | Ground reference | Common return path for all internal circuitry and comparator references |
| WDO | Active-low watchdog output | Open-drain output; asserts low on WDI timeout or VCC undervoltage; deasserts immediately on valid WDI edge |
| VCC1 | Primary supply input | Power source and monitored rail; powers internal circuitry when > VCC2; sets primary reset threshold |
| WDI | Watchdog input | Edge-sensitive input; clears watchdog timer on rising/falling transition; unconnected defaults to ground via 100kΩ |
| VCC2 | Secondary supply input | Monitored rail only; no power delivery function; referenced to same internal bandgap as VCC1 |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneously supervises +3.075V and +2.313V rails without external resistors or calibration |
| Immunity to short VCC transients | Rejects glitches ≤100ns duration; prevents spurious resets during switching noise or load transients |
| Guaranteed reset validity down to +0.8V | Ensures clean reset assertion even during brownout conditions where VCC drops near operational floor |
| Low 15µA supply current | Minimizes quiescent drain on backup supplies or energy-harvesting sources in always-on monitoring |
| Independent watchdog output | WDO operates separately from RST, enabling watchdog-triggered actions (e.g., logging, safe state entry) without resetting CPU |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring +3.3V control logic and +2.5V FPGA I/O banks in carrier-grade line cards subject to hot-swap events and ESD transients. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting reset if either rail dips below spec during insertion or transient overload. Use Value: Prevents configuration corruption in FPGAs and firmware hangs in ARM-based controllers during field-deployed power disturbances. |
Use Scenario: Supervising +3.3V microcontroller core and +2.4V analog sensor interface in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Provides deterministic reset hold time (210ms typical) aligned with slow-starting isolated DC-DC converters feeding analog front ends. Use Value: Eliminates need for discrete RC reset circuits while ensuring synchronized release of digital and analog subsystems after cold start. |
| Medical Diagnostic Imaging | Automotive Infotainment Head Units |
Use Scenario: Validating dual supply integrity (+3.0V ADC reference and +2.3V image sensor bias) in portable ultrasound devices with battery + boost converter architecture. IC Role / Device Role / Timing Role: Monitors both rails with matched tempcos (20ppm/°C) to avoid false resets during thermal cycling in handheld enclosures. Use Value: Maintains clinical data acquisition continuity by rejecting millisecond-scale supply droops caused by motor-driven transducer actuation. |
Use Scenario: Supervising +3.0V infotainment SoC core and +2.3V display interface power in automotive head units exposed to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Open-drain RST and WDO outputs interface directly with 3.3V-tolerant automotive MCU reset pins and safety monitor inputs. Use Value: Enables fail-safe watchdog escalation (WDO → MR loopback) to force full system reboot if display controller locks up mid-operation. |
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; otherwise identical timing, package, and feature set | Suitable for systems with higher primary rail (e.g., +5V legacy logic) and secondary +3.3V domain | Select when monitoring +4.6V and +3.1V rails instead of +3.1V and +2.3V; same PCB layout and firmware integration. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); push-pull RST; no watchdog output; 200ms timeout; SOT23-6 | Lacks dual-rail capability and independent watchdog - requires separate WDT IC for full functionality | Use only if supervising one rail and adding external watchdog; not drop-in for MAX6732UTZWD3+T's dual-monitoring role. |
Compared with MAX6732UTZWD3+T, MAX6732UTLTD3+T offers higher threshold voltages for legacy 5V systems but identical dual-supply architecture, while TPS3808G33DBVR reduces cost and complexity in single-rail designs but sacrifices integrated watchdog and second-rail monitoring - making it unsuitable as a functional replacement without system-level redesign.
Availability
MAX6732UTZWD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, medical imaging devices, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6732UTZWD3+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, communications, and automotive applications, emphasizing reliability, low power, and high integration.
The MAX6730–MAX6735 family was engineered specifically for multivoltage microprocessor systems needing simultaneous rail supervision, deterministic reset timing, and independent watchdog functionality in space-constrained SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6732UTZWD3+T?
The MAX6732UTZWD3+T has factory-set VCC1 reset threshold of +3.075V (TZ suffix) and VCC2 reset threshold of +2.313V (ZW suffix), both specified at ±1.5% tolerance over -40°C to +85°C. These values are laser-trimmed during production and do not require external resistor networks - confirmed in Table 1 of Maxim's MAX6730–MAX6735 datasheet Rev 10.
Does the MAX6732UTZWD3+T support manual reset functionality?
No, the MAX6732UTZWD3+T does not include a manual reset (MR) input. Per the Selector Guide and Pin Description tables, only MAX6730/MAX6731/MAX6734/MAX6735 variants feature MR; MAX6732/MAX6733 are dual-supply supervisors without manual reset capability. This is a deliberate product segmentation - MAX6732UTZWD3+T relies solely on voltage monitoring and watchdog-initiated reset.
What is the watchdog timeout behavior of the MAX6732UTZWD3+T during power-up?
The MAX6732UTZWD3+T implements a dual-mode watchdog: after any reset event (power-up, brownout, or timeout), it enforces a 35s minimum initial watchdog startup delay before entering normal mode. During this period, WDO remains deasserted regardless of WDI state, allowing full system initialization. Only after this delay - or upon first valid WDI edge - does the 1.12s minimum normal timeout period activate, as documented in Electrical Characteristics section "Watchdog Timeout Period".
Can the MAX6732UTZWD3+T monitor a third voltage rail?
No, the MAX6732UTZWD3+T cannot monitor a third voltage. It is a dual-supply supervisor (VCC1 + VCC2 only). The adjustable RSTIN input for monitoring a third rail is exclusive to MAX6734/MAX6735 variants. MAX6732UTZWD3+T lacks the RSTIN pin entirely - its SOT23-6 pinout contains only RST, GND, WDO, VCC1, WDI, and VCC2, with no provision for external comparator input.
What package type and RoHS status does the MAX6732UTZWD3+T use?
The MAX6732UTZWD3+T uses a lead(Pb)-free, RoHS-compliant 6-pin SOT23-6 package (package code U6+1, outline 21-0058). The "+T" suffix explicitly denotes lead-free termination per Maxim's ordering conventions. Thermal resistance is θJA = 230°C/W, validated per JEDEC JESD51-7 on a four-layer board, and the device is rated for continuous operation at up to +85°C ambient.
MAX6732UTZWD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.665V, 2.313V
- 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-6
MAX6732UTZWD3+T FAQ
1.How can I place an order for MAX6732UTZWD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6732UTZWD3+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 MAX6732UTZWD3+T reliable?
The price and inventory of MAX6732UTZWD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6732UTZWD3+T is usually 5 days.
3.What payment methods are accepted for MAX6732UTZWD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6732UTZWD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6732UTZWD3+T?
MAX6732UTZWD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6732UTZWD3+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 MAX6732UTZWD3+T?
For technical support, including MAX6732UTZWD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6732UTZWD3+T requirements.
6.How does Aetrix verify that MAX6732UTZWD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6732UTZWD3+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 MAX6732UTZWD3+T meets industry standards.
7.What is the process for return or replacement of MAX6732UTZWD3+T?
All MAX6732UTZWD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6732UTZWD3+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 MAX6732UTZWD3+T part is unused and in its original packaging.
Return procedure for MAX6732UTZWD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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