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Analog Devices Inc./Maxim Integrated MAX6733UTSVD3
- Part No.:
- MAX6733UTSVD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6733UTSVD3.pdf
- Description:
- IC SUPERVISOR UP SUP CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:282
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Product details
Overview
MAX6733UTSVD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull active-low reset and independent push-pull watchdog output, monitoring VCC1 at +2.925V and VCC2 at +2.188V, featuring 210ms reset timeout, 14µA typical supply current, and operation from -40°C to +85°C - used in telecom power sequencing and multivoltage embedded controllers.
For engineers reviewing the MAX6733UTSVD3 datasheet, MAX6733UTSVD3 pinout, MAX6733UTSVD3 application, or MAX6733UTSVD3 equivalent, key selection criteria include dual-supply threshold accuracy, guaranteed reset validity down to VCC = +0.8V, watchdog startup delay (35s min), and SOT23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6733UTSVD3 implements two independent voltage comparators for VCC1 and VCC2, each with 0.5% hysteresis and 20ppm/°C tempco, asserting RST low when either supply falls below its factory-set threshold. Its reset timeout timer (140–280ms) restarts on any undervoltage event before timeout completion.
A dual-mode watchdog circuit provides a 35s minimum initial timeout after reset for system boot initialization, then transitions to 1.12s minimum normal-mode timeout upon first WDI edge detection; WDO asserts low if WDI remains static beyond timeout, and deasserts immediately when valid edges resume.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +2.925V nominal (S suffix), ±1.5% tolerance over temperature - sets precise brownout point for primary 3.3V rail monitoring |
| VCC2 Threshold | +2.188V nominal (Y suffix), ±1.5% tolerance - enables accurate secondary 2.5V or 2.2V rail supervision |
| Reset Timeout | 210ms typical (D3 suffix), 140–280ms min/max - ensures sufficient hold time for processor initialization and peripheral settling |
| Supply Current | 14µA typical at +3.6V - supports ultra-low-power battery-backed systems and always-on monitoring |
| Watchdog Startup Delay | 35s minimum after reset - accommodates full firmware boot sequence before watchdog enforcement begins |
| Reset Output Type | Active-low push-pull - eliminates need for external pullup, drives directly into µP reset pin without contention risk |
| Operating Temp | -40°C to +85°C - qualified for industrial and telecom equipment environments without derating |
Pinout & Package
MAX6733UTSVD3 is housed in a 6-pin SOT23-6 package (JEDEC MO-178), 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and lead-free finish (RoHS compliant). Pin 1 marked by dot; pin 1 = RST, pin 2 = GND, pin 3 = WDO, pin 4 = MR (not present on MAX6732/MAX6733 per selector guide), pin 5 = WDI, pin 6 = VCC1. VCC2 connects internally to pin 4 only on MAX6732/MAX6733 variants - but MAX6733 uses pin 4 as MR input per Pin Description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST (Pin 1) | Active-low reset output | Push-pull driver asserts low during VCC1/VCC2 undervoltage or MR assertion; holds for full D3 timeout (210ms typ) after recovery |
| GND (Pin 2) | Ground reference | Common return for all internal comparators, watchdog logic, and I/O; requires low-impedance PCB connection to minimize noise coupling |
| WDO (Pin 3) | Active-low watchdog output | Push-pull output asserts low if no WDI edge occurs within watchdog timeout; deasserts immediately on valid edge detection |
| MR (Pin 4) | Active-low manual reset input | Internal 50kΩ pullup to VCC1; driving low forces immediate RST assertion and watchdog clear; 1µs minimum pulse width required |
| WDI (Pin 5) | Watchdog input | Edge-sensitive input; rising or falling transition resets watchdog timer; floating state does not disable watchdog function |
| VCC1 (Pin 6) | Primary supply input | Powers device and feeds VCC1 comparator; must be ≥+0.8V for guaranteed RST validity; accepts 0.8V–5.5V range |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneous supervision of two independent rails (VCC1 = +2.925V, VCC2 = +2.188V) with separate comparators and hysteresis |
| Guaranteed reset validity | RST output remains functional and specified down to VCC1 or VCC2 = +0.8V - critical for brownout detection in low-voltage systems |
| Immunity to short VCC transients | Rejects falling supply glitches ≤10µs (at 100mV overdrive), preventing spurious resets during switching noise or load transients |
| Independent watchdog output | WDO operates separately from RST, enabling system-level fault isolation - e.g., watchdog timeout can trigger diagnostic logging while reset remains inactive |
| Low quiescent current | 14µA typical ICC1 at +3.6V enables integration into always-on subsystems without impacting battery life or thermal budget |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Supervising +3.3V control logic and +2.5V FPGA I/O banks during hot-swap insertion and AC line dropout. IC Role / Device Role / Timing Role: Dual-threshold supervisor ensuring coordinated power-up sequencing and brownout detection across two critical rails. Use Value: Prevents FPGA configuration corruption and communication lockup by asserting reset before either rail drops below operational margin. |
Use Scenario: Monitoring main +24V DC-DC converted rails (+3.3V CPU core, +5V I/O) in programmable logic controller backplane. IC Role / Device Role / Timing Role: Fault-detection node that triggers safe shutdown and status flag assertion upon undervoltage on either monitored supply. Use Value: Enables deterministic fail-safe behavior per IEC 61508 SIL-2 requirements via guaranteed reset assertion at defined thresholds. |
| Network Router Management ASIC | Medical Diagnostic Sensor Hub |
Use Scenario: Ensuring reliable boot of ARM-based management processor and Ethernet PHY supplies in carrier-grade routers. IC Role / Device Role / Timing Role: Dual-rail supervisor with 210ms reset hold time synchronizing bootloader execution and PHY initialization timing. Use Value: Eliminates race conditions between processor clock stabilization and peripheral readiness, reducing field-reported boot failures. |
Use Scenario: Supervising isolated +3.3V analog front-end and +1.8V ADC digital core in portable ultrasound sensor modules. IC Role / Device Role / Timing Role: Low-current supervisor maintaining reset integrity during battery voltage sag during high-power Doppler sampling bursts. Use Value: Guarantees clean restart of signal processing chain when battery dips below 3.0V, preserving data integrity and patient safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6732UTSYD3-T | Same SOT23-6 package and VCC1/VCC2 thresholds (+2.925V/+2.188V), but open-drain RST output requiring external pullup resistor | Suitable where µP reset pin is bidirectional or requires wired-OR reset bus topology | Select MAX6732UTSYD3-T only if open-drain interface is required; MAX6733UTSVD3 avoids pullup component and reduces BOM count |
| TPS3808G33DBVR | Single-supply supervisor (VDD = +3.3V only), 300ms reset timeout, 2.5µA IQ, no manual reset input | Limited to single-rail monitoring; lacks MR and dual-threshold capability | Use TPS3808G33DBVR only for cost-sensitive single-rail applications; MAX6733UTSVD3 provides essential dual-rail coverage and MR flexibility |
Compared with MAX6732UTSYD3-T, MAX6733UTSVD3 eliminates external pullup components and simplifies layout; versus TPS3808G33DBVR, it delivers mandatory dual-supply monitoring and manual reset - making it the only fit for multirail industrial control and telecom baseband designs.
Availability
MAX6733UTSVD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical sensor hubs requiring stable component supply, long-term lifecycle support, and guaranteed reset timing under brownout conditions.
Supply support for MAX6733UTSVD3 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, automotive, and communications markets, with expertise in power management and reliability-critical supervision.
The MAX6730–MAX6735 family was engineered specifically for multivoltage µP-based systems needing simultaneous rail monitoring, robust watchdog protection, and guaranteed reset behavior across wide temperature and supply ranges.
FAQ
What is the exact VCC1 and VCC2 reset threshold voltage for MAX6733UTSVD3?
The MAX6733UTSVD3 has a VCC1 reset threshold of +2.925V (S suffix) and VCC2 threshold of +2.188V (Y suffix), with ±1.5% tolerance over -40°C to +85°C and 20ppm/°C tempco. These values are factory-trimmed and specified in Table 1 of the datasheet; the D3 suffix denotes 140–280ms reset timeout.
Does MAX6733UTSVD3 support manual reset functionality?
Yes, MAX6733UTSVD3 includes an active-low manual reset input (MR) on pin 4, with internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion and clears the watchdog timer; RST remains asserted for the full D3 timeout period (210ms typical) after MR returns high.
What is the watchdog behavior during system power-up for MAX6733UTSVD3?
Upon power-up or reset, MAX6733UTSVD3 enters a 35s minimum initial watchdog mode to allow full system initialization. After the first valid WDI edge, it switches to 1.12s minimum normal-mode timeout. WDO asserts low if no edge occurs within the active timeout period, and deasserts immediately upon edge detection.
Can MAX6733UTSVD3 monitor voltages below +0.8V?
No, MAX6733UTSVD3 guarantees proper reset operation only down to VCC1 or VCC2 = +0.8V. Below this, RST output behavior is unspecified. For sub-0.8V monitoring, external level-shifting or alternative supervisors like MAX6734/MAX6735 with RSTIN input are required - MAX6733UTSVD3 does not include RSTIN.
What package type and dimensions does MAX6733UTSVD3 use?
MAX6733UTSVD3 uses a 6-pin SOT23-6 package (JEDEC MO-178), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. It is RoHS-compliant and available in both leaded and lead-free versions (designated by -T or +T suffix); pin 1 is marked by a dot near the top-left corner.
MAX6733UTSVD3 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:
- 1.575V, 2.925V
- 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
MAX6733UTSVD3 FAQ
1.How can I place an order for MAX6733UTSVD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6733UTSVD3 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 MAX6733UTSVD3 reliable?
The price and inventory of MAX6733UTSVD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6733UTSVD3 is usually 5 days.
3.What payment methods are accepted for MAX6733UTSVD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6733UTSVD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6733UTSVD3?
MAX6733UTSVD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6733UTSVD3 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 MAX6733UTSVD3?
For technical support, including MAX6733UTSVD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6733UTSVD3 requirements.
6.How does Aetrix verify that MAX6733UTSVD3 is sourced from the original manufacturer or authorized distributors?
All MAX6733UTSVD3 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 MAX6733UTSVD3 meets industry standards.
7.What is the process for return or replacement of MAX6733UTSVD3?
All MAX6733UTSVD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6733UTSVD3, 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 MAX6733UTSVD3 part is unused and in its original packaging.
Return procedure for MAX6733UTSVD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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