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Analog Devices Inc./Maxim Integrated MAX6733AUTVDD3+
- Part No.:
- MAX6733AUTVDD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6733AUTVDD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:339
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Product details
Overview
MAX6733AUTVDD3+ from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull reset output, independent push-pull watchdog output, and factory-set reset thresholds of +3.075V (VCC1) and +1.665V (VCC2), supporting 210ms reset timeout. It monitors two supply rails in embedded systems and asserts active-low reset when either drops below its threshold, ensuring reliable power-on and brownout recovery in industrial and telecom equipment.
For engineers reviewing the MAX6733AUTVDD3+ datasheet, MAX6733AUTVDD3+ pinout, MAX6733AUTVDD3+ application, or MAX6733AUTVDD3+ equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed dual-supply monitoring behavior, and real-world timing characteristics - all specific to the MAX6733AUTVDD3+ variant in 6-pin SOT23 package with D3 timeout and VDD/VDD suffix coding.
Technical Context
The MAX6733AUTVDD3+ implements a dual-threshold voltage monitor with fixed VCC1 = +3.075V and VCC2 = +1.665V thresholds, each with ±1.5% tolerance over −40°C to +125°C and 20ppm/°C tempco. Its reset logic asserts RST low on any undervoltage event and holds for 140–280ms (D3 option), with restart capability if either supply dips again before timeout completes.
It integrates a dual-mode watchdog timer: 35s minimum startup delay after reset, then 1.12s minimum normal-mode timeout (tWD-S), triggered by WDI edge transitions. The push-pull WDO and RST outputs drive directly without external pullups, and MR is absent - confirming this variant lacks manual reset input per selector guide and pin configuration data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (nominal), ±1.5% tolerance - sets precise brownout detection point for primary 3.3V rail |
| VCC2 Reset Threshold | +1.665V (nominal), ±1.5% tolerance - enables reliable monitoring of secondary 1.8V or 1.65V core supply |
| Reset Timeout Period | 140–280ms (D3 suffix) - ensures sufficient hold time for processor initialization and peripheral stabilization |
| Watchdog Timeout (Normal) | 1.12–2.24s - provides rapid fault detection during runtime while avoiding false triggers from software delays |
| Supply Current | 14µA typical at +3.6V - enables always-on supervision in battery-backed or low-power systems |
| Operating Temperature | −40°C to +125°C - supports deployment in automotive under-hood, industrial control, and telecom base station environments |
| Package | 6-pin SOT23-6 (U6-1 code) - surface-mount footprint compatible with high-density PCB layouts and automated assembly |
Pinout & Package
MAX6733AUTVDD3+ is housed in a 6-pin SOT23-6 package (U6-1), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low on VCC1/VCC2 undervoltage; no external pullup required; valid down to VCC ≥ +0.8V |
| 2 - GND | Ground reference | Common return path for internal comparators, watchdog, and output drivers; must be low-impedance |
| 3 - WDO | Active-low watchdog output | Push-pull driver; asserts low on WDI timeout or VCC undervoltage; deasserts immediately when condition clears |
| 4 - - | Not connected | No internal connection; left floating per datasheet pin map for MAX6733A |
| 5 - WDI | Watchdog input | Edge-sensitive input; rising/falling transition resets watchdog timer; floating state does not disable function |
| 6 - VCC1 | Primary supply input | Powers device and feeds VCC1 monitor; nominal +3.075V threshold applies; accepts 0.8V–5.5V range |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneously supervises +3.075V and +1.665V rails with independent comparators and hysteresis |
| Push-pull RST and WDO outputs | Eliminates need for external pullup resistors, reducing BOM count and board space in compact designs |
| Dual-mode watchdog timer | 35s startup delay allows full system boot; 1.12s runtime timeout detects firmware hangs without false alarms |
| Immunity to short VCC transients | Rejects glitches ≤10µs (at 75mV overdrive), preventing spurious resets in noisy power environments |
| Guaranteed operation down to VCC = +0.8V | Ensures valid reset assertion during deep brownout, critical for fail-safe shutdown in industrial systems |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
|
Use Scenario: Monitors 3.3V I/O and 1.65V FPGA core supplies in a DIN-rail mounted programmable logic controller exposed to wide ambient temperature swings. IC Role / Device Role: Dual-rail supervisor providing synchronized reset assertion and watchdog supervision to prevent lockup during field firmware updates. Use Value: Ensures deterministic recovery from brownout events across −40°C to +85°C operating range, eliminating unexplained reboots in factory automation. |
Use Scenario: Embedded in a carrier-grade Ethernet line card where 3.3V management and 1.65V SerDes supplies require coordinated reset sequencing. IC Role / Device Role: Voltage supervisor enforcing power-good signaling and watchdog enforcement for ASIC-level fault containment. Use Value: Prevents partial initialization failures by holding reset until both rails stabilize, improving mean time between failures (MTBF) in 24/7 network infrastructure. |
| Medical Diagnostic Imaging Module | Automotive ADAS Camera ECU |
|
Use Scenario: Supervises dual supplies powering FPGA-based image processing pipeline in portable ultrasound equipment with strict safety-critical uptime requirements. IC Role / Device Role: Fault-detection circuit triggering controlled shutdown and diagnostic logging upon supply anomaly. Use Value: Meets IEC 62304 Class C software safety requirements via guaranteed reset validity down to +0.8V and 125°C operation. |
Use Scenario: Mounted on front-camera ECU board monitoring 3.3V sensor interface and 1.65V image signal processor core in engine compartment environment. IC Role / Device Role: Automotive-grade supervisor enabling ASIL-B compliant reset coordination and watchdog coverage for vision processing chain. Use Value: Supports AEC-Q100 Grade 1 qualification with −40°C to +125°C operation and transient-immune reset generation under load dump conditions. |
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+ | Same VCC1/VCC2 thresholds (+3.075V/+1.665V) and D3 timeout, but open-drain RST/WDO outputs requiring external pullups | Suitable where system already uses pullup networks or level-shifting interfaces; less suitable for direct-drive MCU reset pins | Select MAX6732AUTVDD3+ only if open-drain compatibility is required; otherwise MAX6733AUTVDD3+ simplifies layout and reduces component count |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), no VCC2 monitor, 200ms timeout, push-pull RST, but lacks independent watchdog output | Limited to single-rail systems; cannot replace dual-monitoring function without adding discrete circuitry | Use only when monitoring one supply suffices and watchdog independence is not required; MAX6733AUTVDD3+ provides integrated dual-rail + watchdog in same footprint |
Compared with MAX6732AUTVDD3+, MAX6733AUTVDD3+ eliminates external pullups and simplifies timing validation; compared with TPS3808G33DBVR, it adds essential second-rail monitoring and dedicated watchdog signaling - making it the only drop-in solution for dual-supply systems requiring autonomous fault response.
Availability
MAX6733AUTVDD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical imaging modules, and automotive ADAS camera ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6733AUTVDD3+ 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX6730A–MAX6735A family delivers highly integrated, temperature-robust µP supervisors with dual/three-rail monitoring and independent watchdogs - engineered specifically for mission-critical embedded systems where reliability and deterministic reset behavior are non-negotiable.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6733AUTVDD3+?
The MAX6733AUTVDD3+ has factory-set VCC1 reset threshold of +3.075V (±1.5%) and VCC2 reset threshold of +1.665V (±1.5%), as defined by the "VD" suffix in its part number per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over −40°C to +125°C and include 0.5% hysteresis referenced to typical threshold. The MAX6733AUTVDD3+ does not support adjustable RSTIN monitoring - that feature is exclusive to MAX6734A/MAX6735A variants.
Does the MAX6733AUTVDD3+ include a manual reset input (MR)?
No, the MAX6733AUTVDD3+ does not include a manual reset input. Per the Selector Guide and Pin Description table, only MAX6730A, MAX6731A, MAX6734A, and MAX6735A variants feature MR functionality. The MAX6733AUTVDD3+ is a dual-supply supervisor with watchdog and push-pull outputs but no MR pin - pin 4 is unconnected. This matches its designation as a MAX6733A-series device in the ordering table.
What is the reset timeout period for the MAX6733AUTVDD3+ and how is it selected?
The MAX6733AUTVDD3+ uses the "D3" suffix, specifying a reset timeout period of 140ms (minimum) to 280ms (maximum), with typical value ~210ms. This timeout is factory-programmed and non-adjustable. The timer starts when both VCC1 and VCC2 exceed their thresholds and holds RST low for the full duration unless interrupted by another undervoltage event - which restarts the timer. This timing is fully characterized across temperature and supply voltage.
How does the watchdog timer operate on the MAX6733AUTVDD3+?
The MAX6733AUTVDD3+ watchdog operates in two phases: a 35s minimum startup delay after reset (to allow system boot), followed by a 1.12s minimum normal-mode timeout. A rising or falling edge on WDI resets the timer; failure to provide such an edge within the timeout causes WDO to assert low. The MAX6733AUTVDD3+ uses push-pull WDO, so no external pullup is needed - unlike open-drain variants. WDO deasserts immediately when the fault clears.
Is the MAX6733AUTVDD3+ pin-compatible with other MAX673xA variants in SOT23-6?
Yes, the MAX6733AUTVDD3+ shares the identical 6-pin SOT23-6 (U6-1) package and pinout with MAX6730A, MAX6731A, MAX6732A, and MAX6733A - including RST (pin 1), GND (pin 2), WDO (pin 3), NC (pin 4), WDI (pin 5), and VCC1 (pin 6). However, functional differences exist: MAX6733AUTVDD3+ has push-pull RST/WDO and no MR, whereas MAX6730A/MAX6731A include MR and differ in output type. PCB layout is interchangeable, but firmware and external circuitry must match the variant's features.
MAX6733AUTVDD3+ 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:
- 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-23-6
MAX6733AUTVDD3+ FAQ
1.How can I place an order for MAX6733AUTVDD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6733AUTVDD3+ 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+ reliable?
The price and inventory of MAX6733AUTVDD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6733AUTVDD3+ is usually 5 days.
3.What payment methods are accepted for MAX6733AUTVDD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6733AUTVDD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6733AUTVDD3+?
MAX6733AUTVDD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6733AUTVDD3+ 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+?
For technical support, including MAX6733AUTVDD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6733AUTVDD3+ requirements.
6.How does Aetrix verify that MAX6733AUTVDD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6733AUTVDD3+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6733AUTVDD3+?
All MAX6733AUTVDD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6733AUTVDD3+, 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+ part is unused and in its original packaging.
Return procedure for MAX6733AUTVDD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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