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Analog Devices Inc./Maxim Integrated MAX6733UTTWD3
- Part No.:
- MAX6733UTTWD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6733UTTWD3.pdf
- Description:
- IC SUPERVISOR UP SUP CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
MAX6733UTTWD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull active-low reset and push-pull active-low watchdog output, monitoring two fixed supply rails (VCC1 = +3.075V, VCC2 = +2.188V), featuring 210ms reset timeout, 1.12s normal watchdog period, and guaranteed reset validity down to VCC ≥ +0.8V. It is used in multivoltage embedded systems requiring reliable power-on reset and processor lockup detection.
For engineers reviewing the MAX6733UTTWD3 datasheet, MAX6733UTTWD3 pinout, MAX6733UTTWD3 application, or MAX6733UTTWD3 equivalent, this page delivers verified circuit role, factory-set thresholds, watchdog timing behavior, SOT23-6 package mapping, and validated alternative parts for dual-supply µP supervision in telecom, industrial, and portable equipment.
Technical Context
The MAX6733UTTWD3 implements independent dual-threshold voltage monitoring using precision bandgap references, with VTH1 = +3.075V (±75mV) and VTH2 = +2.188V (±75mV), hysteresis of 0.5% of threshold, and tempco of 20ppm/°C. Its reset assertion is synchronized to supply rise/fall crossing these thresholds with 45µs propagation delay.
It integrates a dual-mode watchdog timer: 35s minimum startup delay after reset, then automatic transition to 1.12s minimum normal timeout upon first WDI edge detection; WDI accepts TTL/CMOS levels with 50ns pulse width tolerance and internal 50kΩ MR pullup. The push-pull RST and WDO outputs drive loads directly without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (nominal), ±75mV tolerance - sets precise brownout detection point for primary supply |
| VCC2 Reset Threshold | +2.188V (nominal), ±75mV tolerance - enables concurrent monitoring of secondary rail like I/O or memory supply |
| Reset Timeout Period | 210ms (D3 option) - ensures µP completes boot sequence before releasing reset |
| Watchdog Timeout (Normal) | 1.12s (min) - provides rapid fault response during runtime without excessive sensitivity to software jitter |
| Supply Current | 14µA (typ at +3.6V) - enables use in battery-backed or ultra-low-power systems |
| Operating Temperature | –40°C to +85°C - supports industrial and extended commercial environments |
| Reset Output Type | Active-low push-pull - eliminates need for external pullup and ensures defined logic level during reset hold |
Pinout & Package
MAX6733UTTWD3 is housed in a 6-pin SOT23-6 package (JEDEC MO-178), footprint-compatible with industry-standard 2.8mm × 2.9mm outline, 0.95mm height, and 0.95mm lead pitch. Thermal resistance θJA = 115°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver asserts low when VCC1/VCC2 drop below threshold or WDI stalls; releases high after timeout |
| 2 - GND | Ground reference | Common return for all internal comparators, timers, and output drivers; must be low-impedance |
| 3 - WDO | Active-low watchdog output | Push-pull driver asserts low on WDI timeout or undervoltage; deasserts immediately when valid edge detected |
| 4 - MR | Active-low manual reset input | Drives reset on demand; internal 50kΩ pullup allows direct switch-to-GND connection without external components |
| 5 - WDI | Watchdog input | Edge-sensitive input; rising or falling edge clears watchdog timer; floating state does not disable function |
| 6 - VCC1 | Primary supply input | Powers device and feeds VCC1 monitor; threshold set to +3.075V; also supplies internal reference and logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneous +3.075V and +2.188V thresholds eliminate need for external resistive dividers or discrete supervisors |
| Push-pull RST and WDO outputs | Direct-drive capability removes external pullup resistors, reduces BOM count, and ensures clean signal edges into µP reset pins |
| Guaranteed reset validity to VCC = +0.8V | Ensures deterministic reset assertion during deep brownout or battery discharge, critical for data retention integrity |
| Immunity to short VCC transients | Rejects <100ns glitches (per typical characteristics), preventing spurious resets in noisy power environments |
| Low 14µA supply current | Enables permanent installation in always-on subsystems (e.g., RTC backup, sensor wake logic) without measurable battery drain |
Applications
| Telecom Line Card Power Supervision | Industrial PLC CPU Module |
|---|---|
Use Scenario: Monitoring +3.3V management rail and +1.8V FPGA core rail on a carrier-grade line card with hot-swap capability. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting coordinated reset to ARM-based controller and FPGA upon either rail dropout, with 210ms hold time for configuration loading. Use Value: Prevents partial initialization and metastability by ensuring both processor and programmable logic exit reset simultaneously after stable power. |
Use Scenario: Ensuring deterministic restart of a Cortex-M7 CPU and isolated CAN interface after AC mains interruption in an industrial control cabinet. IC Role / Device Role / Timing Role: Provides VCC1 = +3.075V supervision of 3.3V I/O rail and VCC2 = +2.188V supervision of 2.2V CAN transceiver rail, with push-pull RST driving µP reset and WDO feeding safety watchdog logic. Use Value: Eliminates risk of CAN bus arbitration failure due to asynchronous reset release between MCU and transceiver. |
| Portable Medical Monitor Battery Backup | Network Switch ASIC Initialization |
Use Scenario: Supervising main +3.0V Li-ion supply and +2.2V backup SRAM rail in a handheld ECG monitor with nonvolatile data logging. IC Role / Device Role / Timing Role: Asserts reset if main supply dips below +3.075V or backup drops below +2.188V; uses 210ms timeout to allow ADC calibration routines to complete before µP resumes. Use Value: Guarantees SRAM contents remain intact during brownout by holding reset until both rails are stable above safe operating thresholds. |
Use Scenario: Coordinating power-up sequencing of a multi-core network switch ASIC with separate core (+1.0V), I/O (+2.5V), and auxiliary (+3.3V) rails. IC Role / Device Role / Timing Role: Monitors +3.075V (I/O rail) and +2.188V (auxiliary rail) to trigger system-wide reset if either fails during warm reboot; WDO tied to ASIC's internal watchdog enable. Use Value: Avoids ASIC lockup caused by incomplete register initialization when only one supply recovers prematurely. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage µP supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6732UTTWD3-T | Identical pinout and package, but open-drain RST output requires external pullup resistor | Suitable where µP reset pin is bidirectional or pulled up externally; less suitable for direct-drive applications | Select MAX6732UTTWD3-T only if system already includes pullup on reset net or requires level translation |
| TPS3808G33DBVR | Single-supply supervisor (monitors only +3.3V), no VCC2 input, different timeout options (200ms standard), SOT23-6 | Lacks dual-rail capability; cannot replace MAX6733UTTWD3 in systems requiring concurrent 3.075V/2.188V monitoring | Use TPS3808G33DBVR only when supervising one rail and cost or availability outweighs dual-monitoring requirement |
Compared with MAX6732UTTWD3-T and TPS3808G33DBVR, the MAX6733UTTWD3 uniquely delivers dual-rail monitoring with push-pull outputs in SOT23-6, enabling simpler layout, lower component count, and guaranteed reset coordination across two critical supply domains without external biasing.
Availability
MAX6733UTTWD3 is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, portable medical monitors, and network switch ASICs requiring stable component supply, long-term lifecycle support, and guaranteed factory-set voltage thresholds.
Supply support for MAX6733UTTWD3 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 power management, sensing, and interface applications, with emphasis on reliability and integration for demanding industrial and communications systems.
The MAX6730–MAX6735 family was engineered specifically for multivoltage µP-based systems needing compact, factory-calibrated supervision with independent watchdog functionality-replacing discrete solutions in space-constrained, high-reliability applications.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6733UTTWD3?
The MAX6733UTTWD3 has factory-set VCC1 reset threshold of +3.075V (±75mV) and VCC2 threshold of +2.188V (±75mV), per the "TT" suffix in its part number and Table 1 of the datasheet. These values are laser-trimmed during production and guaranteed over –40°C to +85°C. The MAX6733UTTWD3 does not support adjustable thresholds - only the MAX6734/MAX6735 include RSTIN for third-rail monitoring.
Does the MAX6733UTTWD3 require external pullup resistors on RST or WDO?
No. The MAX6733UTTWD3 features push-pull RST and WDO outputs, so neither requires an external pullup resistor. This distinguishes it from open-drain variants like MAX6732UTTWD3-T. The MAX6733UTTWD3 drives both high and low states actively, ensuring full rail-to-rail swing and eliminating ambiguity during reset assertion or release.
How does the watchdog timer behave during power-up on the MAX6733UTTWD3?
The MAX6733UTTWD3 implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR assertion), it enters a 35s minimum startup delay before beginning normal operation. Once the first valid WDI edge is detected, it switches to the 1.12s minimum normal timeout period. This prevents false timeouts during boot while ensuring rapid fault detection once software is running.
Can the MAX6733UTTWD3 monitor voltages below +0.8V?
No. The MAX6733UTTWD3 guarantees proper reset assertion only down to VCC1 or VCC2 ≥ +0.8V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Below +0.8V, internal circuitry may become undefined. For sub-0.8V monitoring, external level-shifting or a dedicated low-voltage supervisor would be required - the MAX6733UTTWD3 itself does not support such operation.
Is the MR input on the MAX6733UTTWD3 internally pulled up, and what is its logic threshold?
Yes, the MAX6733UTTWD3 includes a 50kΩ internal pullup resistor from MR to VCC1, allowing MR to be left unconnected if unused. Its logic thresholds are VIH = 0.7 × VCC1 and VIL = 0.3 × VCC1, compatible with standard CMOS/TTL levels. A 1µs minimum pulse width is required for reliable manual reset assertion, and MR has 100ns glitch rejection.
MAX6733UTTWD3 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:
- 1.665V, 3.075V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6733UTTWD3 FAQ
1.How can I place an order for MAX6733UTTWD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6733UTTWD3 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 MAX6733UTTWD3 reliable?
The price and inventory of MAX6733UTTWD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6733UTTWD3 is usually 5 days.
3.What payment methods are accepted for MAX6733UTTWD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6733UTTWD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6733UTTWD3?
MAX6733UTTWD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6733UTTWD3 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 MAX6733UTTWD3?
For technical support, including MAX6733UTTWD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6733UTTWD3 requirements.
6.How does Aetrix verify that MAX6733UTTWD3 is sourced from the original manufacturer or authorized distributors?
All MAX6733UTTWD3 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 MAX6733UTTWD3 meets industry standards.
7.What is the process for return or replacement of MAX6733UTTWD3?
All MAX6733UTTWD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6733UTTWD3, 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 MAX6733UTTWD3 part is unused and in its original packaging.
Return procedure for MAX6733UTTWD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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