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Analog Devices Inc./Maxim Integrated MAX6733AUTLTD3+T
- Part No.:
- MAX6733AUTLTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6733AUTLTD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6733AUTLTD3+T from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull reset output, active-low watchdog output, and factory-set reset thresholds of +4.625V (VCC1) and +3.075V (VCC2), supporting 210ms reset timeout. It monitors two fixed supply rails in embedded systems requiring reliable power-on reset and lockup protection.
For engineers reviewing the MAX6733AUTLTD3+T datasheet, MAX6733AUTLTD3+T pinout, MAX6733AUTLTD3+T application, or MAX6733AUTLTD3+T equivalent, this page delivers verified electrical specs, SOT23-6 package mapping, watchdog timing behavior, and real-world multivoltage system integration guidance - all confirmed against Maxim's official datasheet Rev 0 (8/06).
Technical Context
The MAX6733AUTLTD3+T implements dual independent voltage monitoring with fixed VCC1/VCC2 thresholds and a dedicated watchdog timer featuring dual-mode operation: 35s minimum startup delay after reset, followed by 1.12s minimum normal-mode timeout. Its push-pull RST and WDO outputs eliminate external pullups and support direct interfacing with bidirectional µP reset pins via a 10kΩ series resistor.
It operates across –40°C to +125°C, guarantees valid reset down to VCC1 or VCC2 = +0.8V, and draws only 14µA typical supply current at +3.6V. Immunity to short VCC transients is ensured by built-in glitch rejection (100ns MR pulse rejection, 45µs VCC-to-RST delay).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +4.625V nominal (±125mV tolerance); monitors primary 4.6V rail with 0.5% hysteresis for stable brownout detection |
| VCC2 Reset Threshold | +3.075V nominal (±75mV tolerance); monitors secondary 3.3V rail independently of VCC1 |
| Reset Timeout Period | 210ms nominal (140–280ms range); ensures sufficient hold time for full µP initialization before release |
| Watchdog Timeout (Normal) | 1.68s typical (1.12–2.24s min/max); provides rapid fault detection during runtime without false triggers |
| Supply Current | 14µA typical at +3.6V; enables battery-backed operation in portable equipment with minimal quiescent drain |
| Operating Temperature | –40°C to +125°C; qualified for under-hood automotive, industrial control, and telecom base station environments |
| Output Type | Push-pull RST and WDO; eliminates need for external pullup resistors and supports direct drive of CMOS inputs |
Pinout & Package
MAX6733AUTLTD3+T is housed in a 6-pin SOT23-6 package (pkg code U6-1), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and JEDEC-compliant footprint. Pin 1 is marked with a dot; device orientation follows standard SOT23 top-view convention.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output; asserts low on VCC1/VCC2 undervoltage or WDI timeout; drives µP reset directly |
| 2 | GND | Analog/digital ground reference; must be connected to system common ground plane for accurate threshold sensing |
| 3 | WDO | Active-low push-pull watchdog output; asserts low if no WDI edge occurs within 1.68s; can be tied to MR for auto-reset |
| 4 | MR | Active-low manual reset input; internal 50kΩ pullup to VCC1; accepts CMOS logic or momentary switch to GND |
| 5 | WDI | Watchdog input; clears timer on rising/falling edge; floating WDI does not disable watchdog; requires no pullup |
| 6 | VCC1 | Primary supply input; powers device when ≥ VCC2; sets bias for VCC1 monitor and internal references |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneous supervision of +4.625V and +3.075V rails eliminates need for two discrete supervisors or external resistive dividers |
| Independent watchdog with dual-mode timing | 35s startup delay allows full boot sequence completion; 1.68s runtime timeout detects software hangs without false resets |
| Push-pull RST/WDO outputs | Drives loads up to 1.2mA at +2.7V without external components; compatible with bidirectional µP reset I/O via 10kΩ series resistor |
| Guaranteed operation down to +0.8V supply | Ensures valid reset assertion even during deep brownout conditions, critical for fail-safe system recovery |
| Low 14µA supply current | Enables use in always-on subsystems and battery-powered applications where standby power is constrained |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
|
Use Scenario: Monitoring +48V DC-DC converter output and +3.3V FPGA core rail in a remote radio unit. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting synchronized reset to baseband processor and RF transceiver upon any rail failure. Use Value: Prevents partial initialization and state corruption during asymmetric power-up/down sequences across distributed voltage domains. |
Use Scenario: Supervising main +24V I/O supply and +5V logic rail in an industrial programmable logic controller. IC Role / Device Role / Timing Role: Generating 210ms reset pulse and watchdog-triggered recovery to maintain deterministic control loop execution. Use Value: Eliminates need for external RC timing networks and reduces BOM count while meeting IEC 61000-4-2/4-4 immunity requirements. |
| Server Management Controller | Portable Medical Monitor |
|
Use Scenario: Ensuring clean boot of BMC (Baseboard Management Controller) powered by +3.3V and +1.8V rails. IC Role / Device Role / Timing Role: Providing push-pull RST to avoid contention with bidirectional reset pins on ARM-based BMC SoCs. Use Value: Enables direct connection without level-shifting or buffering, reducing layout complexity and signal integrity risk. |
Use Scenario: Supervising +3.3V main logic and +1.2V sensor interface rail in a handheld ECG device with Li-ion backup. IC Role / Device Role / Timing Role: Delivering ultra-low 14µA quiescent current and guaranteed reset down to +0.8V during battery sag. Use Value: Extends usable battery life in standby mode and ensures safe shutdown before deep discharge damage occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6732AUTLTD3+T | Same pinout and thresholds, but open-drain RST output requiring external pullup resistor | Suitable where reset line must be shared with other open-drain devices (e.g., I²C-compatible reset buses) | Select when bus-wired reset topology is required; avoid if driving CMOS inputs directly without pullup |
| TPS3808G33DBVR | Single-supply supervisor (+3.3V threshold only); no dual-rail monitoring; 200ms fixed timeout; 2.5µA IQ | Limited to single-rail systems; lacks watchdog output and manual reset input | Choose only for cost-sensitive, single-rail applications where dual monitoring is unnecessary |
Compared with MAX6732AUTLTD3+T and TPS3808G33DBVR, the MAX6733AUTLTD3+T uniquely combines dual-rail supervision, push-pull outputs, and integrated watchdog in a 6-pin SOT23 - enabling compact, robust reset architecture without external components or timing compromises.
Availability
MAX6733AUTLTD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, server management controllers, and portable medical devices requiring stable component supply, extended temperature operation, and long-term lifecycle continuity.
Supply support for MAX6733AUTLTD3+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6730A–MAX6735A family was engineered specifically for high-reliability multivoltage µP systems needing integrated reset, watchdog, and manual reset in minimal footprint - targeting space-constrained, wide-temperature embedded platforms.
FAQ
What are the exact reset threshold voltages for MAX6733AUTLTD3+T?
The MAX6733AUTLTD3+T has factory-set reset thresholds of +4.625V (VCC1, ±125mV) and +3.075V (VCC2, ±75mV), per Maxim's Reset Voltage Threshold Suffix Guide (LT suffix). These values are trimmed during production and guaranteed over –40°C to +125°C with 20ppm/°C tempco and 0.5% hysteresis referenced to typical threshold.
Does MAX6733AUTLTD3+T support manual reset functionality?
Yes, MAX6733AUTLTD3+T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces RST assertion for the full 210ms timeout period, then holds RST low for the remainder of the timeout after MR releases. MR accepts CMOS logic levels and supports momentary switch interfaces without external debounce.
What is the watchdog behavior of MAX6733AUTLTD3+T during power-up?
Upon power-up or reset assertion, MAX6733AUTLTD3+T enters a 35s minimum initial watchdog mode (tWD-L), allowing full system initialization. After this period expires or after the first valid WDI edge, it transitions to normal 1.12s minimum timeout mode (tWD-S). WDO asserts low if no WDI transition occurs within the active timeout window.
Can MAX6733AUTLTD3+T monitor three voltage rails?
No, MAX6733AUTLTD3+T monitors exactly two fixed voltage rails (VCC1 and VCC2). The three-rail capability (VCC1, VCC2, and adjustable RSTIN) is exclusive to MAX6734A/MAX6735A variants in 8-pin SOT23 packages. MAX6733AUTLTD3+T is a 6-pin dual-supply device with no RSTIN pin.
What package and lead finish does MAX6733AUTLTD3+T use?
MAX6733AUTLTD3+T uses a 6-pin SOT23-6 package (JEDEC MO-178, pkg code U6-1) with gull-wing leads. The "+T" suffix confirms lead-free (RoHS-compliant) matte tin finish, per Maxim's ordering convention. Dimensions are 2.9mm × 1.6mm × 1.1mm with 0.95mm lead pitch.
MAX6733AUTLTD3+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:
- 3.075V, 4.625V
- 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
MAX6733AUTLTD3+T FAQ
1.How can I place an order for MAX6733AUTLTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6733AUTLTD3+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 MAX6733AUTLTD3+T reliable?
The price and inventory of MAX6733AUTLTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6733AUTLTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6733AUTLTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6733AUTLTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6733AUTLTD3+T?
MAX6733AUTLTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6733AUTLTD3+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 MAX6733AUTLTD3+T?
For technical support, including MAX6733AUTLTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6733AUTLTD3+T requirements.
6.How does Aetrix verify that MAX6733AUTLTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6733AUTLTD3+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 MAX6733AUTLTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6733AUTLTD3+T?
All MAX6733AUTLTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6733AUTLTD3+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 MAX6733AUTLTD3+T part is unused and in its original packaging.
Return procedure for MAX6733AUTLTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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