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Analog Devices Inc./Maxim Integrated MAX6733AUTVDD3+T
- Part No.:
- MAX6733AUTVDD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6733AUTVDD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6733AUTVDD3+T from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull reset output, active-low watchdog output, and no manual reset input. It monitors two fixed supply rails (VCC1 = +2.625V nominal, VCC2 = +1.575V nominal), provides 210ms reset timeout, operates from -40°C to +125°C, and draws only 14µA typical supply current at +3.6V - used in multivoltage embedded systems requiring reliable power-on reset and watchdog supervision.
For engineers reviewing the MAX6733AUTVDD3+T datasheet, MAX6733AUTVDD3+T pinout, MAX6733AUTVDD3+T application, or MAX6733AUTVDD3+T equivalent, this page delivers verified circuit role, factory-set thresholds, watchdog timing behavior, SOT23-6 package mapping, and real-world substitution guidance - all confirmed against Maxim's official MAX6730A–MAX6735A datasheet Rev 0 (8/06).
Technical Context
The MAX6733AUTVDD3+T implements dual independent voltage monitoring using precision bandgap references, with VCC1 threshold set to +2.625V (±37.5mV) and VCC2 to +1.575V (±37.5mV), both with 20ppm/°C tempco and 0.5% hysteresis. Its reset assertion is guaranteed valid down to VCC1 or VCC2 = +0.8V, and it features glitch-immune detection of falling VCC transients as short as 45µs.
This device integrates a dual-mode watchdog timer: a 35s minimum startup delay after reset enables full system initialization, followed by a 1.12s minimum normal-mode timeout period. The watchdog input (WDI) clears on any edge transition, and the push-pull WDO output deasserts immediately when valid activity resumes - no timeout delay required for recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +2.625V (nominal, falling); ensures reliable reset assertion during brownout of primary 2.6V rail |
| VCC2 Reset Threshold | +1.575V (nominal, falling); monitors secondary 1.6V core or I/O supply with ±37.5mV tolerance |
| Reset Timeout Period | 210ms (D3 option); provides sufficient hold time for slow-starting µP clocks and memory initialization |
| Watchdog Timeout (Normal) | 1.12s (min); detects software lockup within sub-second window without false triggers from transient delays |
| Supply Current | 14µA (typ at +3.6V); enables use in battery-backed or ultra-low-power always-on monitoring circuits |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive, industrial PLC, and telecom line-card environments |
| Package | SOT23-6 (U6-1); 2.9mm × 1.6mm footprint supports high-density PCB layouts with minimal board area |
Pinout & Package
MAX6733AUTVDD3+T is housed in a 6-pin SOT23-6 package (pkg code U6-1), with 0.95mm pitch, 1.6mm width, and 2.9mm length - compatible with standard SMT reflow profiles and automated assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output; drives low without external pullup; asserts if VCC1/VCC2 drop below threshold or WDI stalls |
| 2 | GND | Ground reference for all internal comparators, watchdog logic, and output drivers |
| 3 | WDO | Active-low push-pull watchdog output; asserts independently of RST when WDI fails to toggle within timeout window |
| 4 | MR | No connection (not implemented); MAX6733A variant excludes manual reset input per selector guide |
| 5 | WDI | Watchdog input; edge-sensitive (rising/falling); floating state does not disable watchdog; requires no pullup/down |
| 6 | VCC1 | Primary supply input; powers device and feeds VCC1 monitor; must be ≥ +0.8V for valid reset operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneously supervises +2.625V and +1.575V rails with independent thresholds - eliminates need for two discrete supervisors |
| Push-pull RST and WDO outputs | Drives reset and watchdog signals directly into µP inputs without external pullups - reduces BOM count and layout complexity |
| 210ms factory-set reset timeout | Matches typical µP boot sequence duration; avoids premature release while ensuring timely system recovery |
| 1.12s watchdog timeout (normal mode) | Short enough to catch firmware hangs in real-time control loops, yet long enough to tolerate worst-case ISR execution |
| Immunity to short VCC transients | Rejects glitches ≤45µs wide - prevents spurious resets during switching noise or load-step events |
| Low 14µA supply current | Enables permanent monitoring in energy-constrained applications such as battery-backed RTC or sensor nodes |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 2.6V MCU core supply and 1.6V CAN transceiver I/O rail in a temperature-hardened controller unit. IC Role / Device Role / Timing Role: Dual-rail supervisor providing synchronized reset assertion and independent watchdog supervision for fault-tolerant operation. Use Value: Guarantees clean reset across both rails before firmware execution begins, and detects lockup in safety-critical CAN communication stack. |
Use Scenario: Supervises 2.6V microcontroller and 1.6V LIN transceiver in a door module exposed to -40°C cold cranking and 125°C under-hood conditions. IC Role / Device Role / Timing Role: High-temp-rated dual-supply monitor with push-pull outputs driving reset and watchdog lines directly into MCU pins. Use Value: Eliminates external pullups and supports extended temperature range without derating - reduces component count and improves thermal reliability. |
| Telecom Line Card | Medical Diagnostic Sensor Hub |
Use Scenario: Ensures stable power-up sequencing for dual-rail FPGA-based signal processing engine in carrier-grade access equipment. IC Role / Device Role / Timing Role: Voltage supervisor enforcing 210ms reset hold time and 1.12s watchdog timeout to match FPGA configuration and soft-core boot timelines. Use Value: Prevents partial configuration or corrupted register states by holding reset until both supplies stabilize and firmware completes initialization. |
Use Scenario: Provides fail-safe reset and watchdog for a low-power ARM Cortex-M based sensor aggregator handling ECG, SpO₂, and temperature data. IC Role / Device Role / Timing Role: Ultra-low-current (14µA) dual-supply supervisor enabling always-on monitoring without compromising battery life. Use Value: Extends single-cell Li-ion battery runtime beyond 3 years in standby while maintaining certified fault-detection response times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6732AUTVDD3+T | Same pinout and thresholds, but open-drain RST output requiring external pullup resistor | Used where reset line must be shared with other open-drain devices (e.g., I²C-style reset bus) | Select when system-level reset architecture mandates wired-OR capability or level translation |
| TPS3808G33DBVR | Single-supply supervisor (only monitors 3.3V), no dual-rail capability, 200ms timeout, 2.5µA quiescent current | Applicable only when monitoring one rail; lacks VCC2 input and independent watchdog output | Choose only for cost-sensitive single-rail designs where dual monitoring is unnecessary |
Compared with MAX6733AUTVDD3+T, MAX6732AUTVDD3+T offers identical monitoring and timing but requires external pullup for RST, increasing BOM and layout overhead; TPS3808G33DBVR reduces current draw but sacrifices dual-rail supervision and independent watchdog signaling - making MAX6733AUTVDD3+T optimal for space-constrained, multivoltage systems needing integrated push-pull drive.
Availability
MAX6733AUTVDD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and telecom line cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6733AUTVDD3+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 - emphasizing reliability, temperature robustness, and integration density.
The MAX6730A–MAX6735A family delivers compact, factory-configured µP supervisors targeting multivoltage embedded systems where board space, power budget, and qualification rigor are critical constraints.
FAQ
What is the exact VCC1 and VCC2 reset threshold voltage for MAX6733AUTVDD3+T?
The MAX6733AUTVDD3+T has a VCC1 reset threshold of +2.625V (nominal, falling) and a VCC2 threshold of +1.575V (nominal, falling), both with ±37.5mV tolerance over temperature and 20ppm/°C tempco - confirmed in Table 1 of the MAX6730A–MAX6735A datasheet Rev 0.
Does MAX6733AUTVDD3+T include a manual reset input (MR)?
No, MAX6733AUTVDD3+T does not implement MR. Per the Selector Guide and Pin Description table, MAX6733A variants omit the manual reset input - pin 4 is NC. Only MAX6730A, MAX6731A, MAX6734A, and MAX6735A include MR functionality.
What is the watchdog timeout behavior of MAX6733AUTVDD3+T during power-up?
MAX6733AUTVDD3+T uses a dual-mode watchdog: after reset assertion, it enforces a 35s minimum initial timeout period to allow full system initialization, then switches to a 1.12s minimum normal-mode timeout - triggered by the first valid WDI edge transition or expiration of the initial period.
Is MAX6733AUTVDD3+T compatible with bidirectional µP reset pins?
Yes, but caution is required. Unlike open-drain variants, MAX6733AUTVDD3+T's push-pull RST output may cause contention with bidirectional µP reset I/O. Maxim recommends inserting a 10kΩ series resistor between RST and the µP pin to prevent logic conflict - documented in Figure 5 of the datasheet.
What package type and dimensions does MAX6733AUTVDD3+T use?
MAX6733AUTVDD3+T uses the SOT23-6 package (pkg code U6-1), measuring 2.9mm × 1.6mm × 1.1mm with 0.95mm lead pitch. It is lead-free (indicated by "+T" suffix) and fully compatible with standard reflow soldering profiles per JEDEC J-STD-020.
MAX6733AUTVDD3+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:
- 0.788V, 1.575V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6733AUTVDD3+T FAQ
1.How can I place an order for MAX6733AUTVDD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6733AUTVDD3+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 MAX6733AUTVDD3+T reliable?
The price and inventory of MAX6733AUTVDD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6733AUTVDD3+T is usually 5 days.
3.What payment methods are accepted for MAX6733AUTVDD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6733AUTVDD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6733AUTVDD3+T?
MAX6733AUTVDD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6733AUTVDD3+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 MAX6733AUTVDD3+T?
For technical support, including MAX6733AUTVDD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6733AUTVDD3+T requirements.
6.How does Aetrix verify that MAX6733AUTVDD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6733AUTVDD3+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 MAX6733AUTVDD3+T meets industry standards.
7.What is the process for return or replacement of MAX6733AUTVDD3+T?
All MAX6733AUTVDD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6733AUTVDD3+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 MAX6733AUTVDD3+T part is unused and in its original packaging.
Return procedure for MAX6733AUTVDD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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