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Analog Devices Inc./Maxim Integrated MAX6732UTLTD3-T
- Part No.:
- MAX6732UTLTD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6732UTLTD3-T.pdf
- Description:
- IC SUPERVISOR UP SUP CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
MAX6732UTLTD3-T from Maxim Integrated is a dual-voltage microprocessor supervisory IC with independent watchdog output, monitoring VCC1 at +4.625V and VCC2 at +3.075V, featuring 210ms reset timeout, open-drain RST/WDO outputs, and operation from -40°C to +85°C. It ensures reliable system boot and runtime supervision in multivoltage embedded systems.
For engineers reviewing the MAX6732UTLTD3-T datasheet, MAX6732UTLTD3-T pinout, MAX6732UTLTD3-T application, or MAX6732UTLTD3-T equivalent, key selection criteria include dual-supply threshold accuracy, watchdog startup delay (35s min), low 14µA supply current, immunity to short VCC transients, and SOT23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6732UTLTD3-T implements two independent voltage comparators with factory-set thresholds (+4.625V for VCC1, +3.075V for VCC2), hysteresis of 0.5% of VTH, and guaranteed reset validity down to VCC = +0.8V. Its reset logic asserts active-low RST when either supply falls below its threshold and holds for the full 210ms timeout period after recovery.
It integrates a dual-mode watchdog timer: initial mode (≥35s) enables safe system initialization post-power-up, followed by normal mode (≥1.12s) for rapid fault detection. The WDI input clears the timer on any edge; unconnected WDI does not disable watchdog functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +4.625V nominal (LT suffix), ±125mV tolerance - sets precise brownout detection for primary 5V/4.8V rails |
| VCC2 Threshold | +3.075V nominal (T suffix), ±75mV tolerance - monitors secondary 3.3V supply with guaranteed margin |
| Reset Timeout | 210ms nominal (D3 suffix), 140–280ms range - provides sufficient hold time for slow peripherals during power recovery |
| Supply Current | 14µA typical at +3.6V - enables battery-backed operation for >10 years in always-on monitoring applications |
| Watchdog Startup Delay | ≥35s after reset - accommodates complex firmware initialization without false timeout |
| Operating Temp | -40°C to +85°C - supports industrial-grade reliability without derating in harsh environments |
| Package | SOT23-6 - 2.9mm × 1.6mm footprint compatible with high-density PCB assembly |
Pinout & Package
MAX6732UTLTD3-T is housed in a 6-pin SOT23 package (U6-1 outline, JEDEC MO-178AA), with 0.95mm pitch, 1.3mm max height, and RoHS-compliant lead-free finish (suffix -T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain output requiring external pullup; asserts low on VCC1/VCC2 undervoltage or watchdog timeout |
| 2 - GND | Ground reference | Common return path for all internal comparators and logic; must be low-impedance for accurate threshold sensing |
| 3 - WDO | Active-low watchdog output | Open-drain watchdog alert; deasserts only after valid WDI edge and stable VCC1/VCC2 above thresholds |
| 4 - MR | Manual reset input | Not present on MAX6732 - pin 4 is unused (no manual reset capability per selector guide) |
| 5 - WDI | Watchdog input | Edge-sensitive input; rising or falling transition resets watchdog timer; no pullup/pulldown required |
| 6 - VCC1 | Primary supply input | Power source and monitored rail; supplies internal circuitry and defines primary reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneously supervises two independent rails (VCC1 = +4.625V, VCC2 = +3.075V) without external resistors |
| Independent watchdog output | WDO operates separately from RST, enabling watchdog-triggered actions (e.g., NMI assertion) without resetting CPU |
| Immunity to short VCC transients | Rejects glitches ≤10µs at 100mV overdrive - prevents spurious resets during switching noise or load transients |
| Low supply current | 14µA typical at +3.6V - reduces quiescent power in battery-powered systems and eliminates thermal concerns |
| Guaranteed reset down to +0.8V | Valid RST assertion even as VCC1 or VCC2 collapses to +0.8V - ensures clean shutdown before logic corruption |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Monitoring +4.8V line card supply and +3.3V FPGA core voltage in carrier-grade access equipment. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting coordinated reset to DSP and FPGA upon either rail dropout, with 210ms hold time ensuring sequenced reinitialization. Use Value: Eliminates need for discrete comparators and RC timers, reducing BOM count by 4 components while improving threshold accuracy to ±2.7%. |
Use Scenario: Supervising +5V controller supply and +24V I/O bus voltage in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Voltage monitor triggering system-wide reset on undervoltage, with open-drain RST compatible with optocoupled isolation interfaces. Use Value: Enables direct interface to 24V-rated opto-isolators via external pullup, avoiding level-shifting circuitry and saving 2.1mm² board area. |
| Network Router Control Plane | Medical Diagnostic Imaging Subsystem |
|
Use Scenario: Ensuring reliable boot of ARM-based control processor powered by +5V and +3.3V DC/DC converters in enterprise routers. IC Role / Device Role / Timing Role: Dual-threshold supervisor with 35s watchdog startup delay allowing full Linux kernel load before watchdog activation. Use Value: Prevents premature watchdog timeout during 30s+ boot sequence, eliminating field failures caused by incomplete firmware initialization. |
Use Scenario: Monitoring +5V analog front-end supply and +3.3V digital signal processor supply in portable ultrasound units. IC Role / Device Role / Timing Role: Low-current (14µA) supervisor maintaining reset integrity during battery-saver sleep modes between imaging cycles. Use Value: Extends single-charge battery life by 18 months versus discrete solutions, meeting IEC 62304 Class C power budget requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6732UTSYD3-T | VCC1 = +4.375V, VCC2 = +2.925V - lower thresholds optimized for 4.5V/3.0V rails | Better fit for systems using 4.5V logic with tighter 3.0V tolerance; same 210ms timeout and SOT23-6 package | Select when primary supply is 4.5V nominal rather than 5V, and secondary is 3.0V instead of 3.3V |
| TLV809E33DBZR | Single-voltage supervisor (3.3V only), no watchdog, push-pull RST, 200ms timeout - lacks dual-rail and watchdog features | Only suitable for basic 3.3V-only systems; requires separate watchdog IC for full functionality | Choose only if dual-monitoring and independent watchdog are unnecessary and cost is primary constraint |
Compared with MAX6732UTLTD3-T, MAX6732UTSYD3-T offers matched dual-rail supervision at different voltage points but identical timing and packaging, whereas TLV809E33DBZR sacrifices dual monitoring and watchdog independence to reduce unit cost-making it viable only in simplified single-rail designs.
Availability
MAX6732UTLTD3-T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, network routers, and medical imaging subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6732UTLTD3-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 industrial, communications, and computing applications, with emphasis on high-reliability, low-power, and small-footprint solutions.
The MAX6730–MAX6735 family was developed specifically for multivoltage microprocessor systems needing coordinated reset generation, robust watchdog supervision, and minimal external components - targeting space-constrained, thermally demanding embedded platforms.
FAQ
What is the exact VCC1 and VCC2 reset threshold voltage for MAX6732UTLTD3-T?
The MAX6732UTLTD3-T has a VCC1 reset threshold of +4.625V (LT suffix) and a VCC2 reset threshold of +3.075V (T suffix), with ±125mV and ±75mV tolerances respectively across temperature. These values are factory-trimmed and specified in the Electrical Characteristics table of the MAX6730–MAX6735 datasheet Rev 7.
Does MAX6732UTLTD3-T include a manual reset input (MR)?
No, MAX6732UTLTD3-T does not include a manual reset input. Per the Selector Guide and Pin Description, MR is only present on MAX6730/MAX6731/MAX6734/MAX6735 variants; MAX6732/MAX6733 are dual-supply supervisors without MR functionality - pin 4 is unused.
What is the watchdog timeout behavior of MAX6732UTLTD3-T during power-up?
Upon power-up or reset, MAX6732UTLTD3-T enters an initial watchdog mode with ≥35s timeout to allow full system initialization. After the first valid WDI edge or expiration of this period, it switches to normal mode with ≥1.12s timeout. This dual-mode architecture prevents false timeouts during boot sequences.
Is MAX6732UTLTD3-T compatible with 5V-tolerant microprocessor reset inputs?
Yes - MAX6732UTLTD3-T's open-drain RST output can interface directly with 5V-tolerant µP reset pins when pulled up to the µP's VDDIO (e.g., 5V). The output low voltage is guaranteed ≤0.4V at 3.2mA sink, ensuring solid logic-low assertion across voltage domains.
What package type and dimensions does MAX6732UTLTD3-T use?
MAX6732UTLTD3-T uses a 6-pin SOT23 package (outline U6-1, JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.3mm max height, with 0.95mm lead pitch and RoHS-compliant lead-free finish indicated by the "-T" suffix.
MAX6732UTLTD3-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:
- 3.075V, 4.625V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6732UTLTD3-T FAQ
1.How can I place an order for MAX6732UTLTD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6732UTLTD3-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 MAX6732UTLTD3-T reliable?
The price and inventory of MAX6732UTLTD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6732UTLTD3-T is usually 5 days.
3.What payment methods are accepted for MAX6732UTLTD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6732UTLTD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6732UTLTD3-T?
MAX6732UTLTD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6732UTLTD3-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 MAX6732UTLTD3-T?
For technical support, including MAX6732UTLTD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6732UTLTD3-T requirements.
6.How does Aetrix verify that MAX6732UTLTD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6732UTLTD3-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 MAX6732UTLTD3-T meets industry standards.
7.What is the process for return or replacement of MAX6732UTLTD3-T?
All MAX6732UTLTD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6732UTLTD3-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 MAX6732UTLTD3-T part is unused and in its original packaging.
Return procedure for MAX6732UTLTD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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