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Analog Devices Inc./Maxim Integrated MAX6733UTSYD3
- Part No.:
- MAX6733UTSYD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6733UTSYD3.pdf
- Description:
- IC SUPERVISOR UP SUP CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,254
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Product details
Overview
MAX6733UTSYD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull active-low reset output, independent push-pull watchdog output, and factory-set reset thresholds of +2.925V (VCC1) and +2.188V (VCC2). It features 140ms–280ms reset timeout, 35s minimum watchdog startup delay, and operates over –40°C to +85°C. Used in multivoltage embedded systems to ensure reliable power-on and brownout reset sequencing.
For engineers reviewing the MAX6733UTSYD3 datasheet, MAX6733UTSYD3 pinout, MAX6733UTSYD3 application, or MAX6733UTSYD3 equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, watchdog timing behavior, reset threshold accuracy, and real-world substitution guidance for dual-supply µP supervision.
Technical Context
The MAX6733UTSYD3 monitors two fixed supply rails-VCC1 at +2.925V and VCC2 at +2.188V-with guaranteed reset assertion down to VCC ≥ +0.8V. Its internal comparators feature 20ppm/°C tempco and 0.5% hysteresis referenced to typical threshold values.
It implements a dual-mode watchdog timer: 35s (min) initial timeout after reset for system initialization, then automatic transition to 1.12s (min) normal-mode timeout upon first WDI edge detection. The push-pull RST and WDO outputs drive loads directly without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +2.925V nominal (SY suffix), ±1.5% over temperature - sets precise power-good window for primary 3.0V rail |
| VCC2 Reset Threshold | +2.188V nominal (SY suffix), ±1.5% over temperature - enables accurate monitoring of secondary 2.2V logic or I/O supply |
| Reset Timeout Period | 140ms–280ms (D3 suffix) - ensures sufficient hold time for processor core initialization and memory stabilization |
| Watchdog Startup Delay | 35s minimum after reset - accommodates full boot sequence before watchdog enforcement begins |
| Supply Current | 14µA typical at +3.6V - enables long battery life in portable equipment with no compromise on supervision reliability |
| Operating Temperature | –40°C to +85°C - fully specified for industrial and telecom environments without derating |
| Reset Output Type | Active-low push-pull - eliminates need for external pullup resistor and supports direct interface to bidirectional µP reset pins |
Pinout & Package
MAX6733UTSYD3 is housed in a 6-pin SOT23-6 package (JEDEC MO-178), measuring 2.90mm × 1.60mm × 1.10mm, with gull-wing leads and RoHS-compliant lead-free finish (designated by "+T" suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output; asserts when VCC1 < +2.925V, VCC2 < +2.188V, or during manual reset; drives µP reset pin directly |
| 2 | GND | Analog/digital ground reference for all internal comparators and watchdog circuitry |
| 3 | WDO | Active-low push-pull watchdog output; asserts if WDI remains static >1.12s (normal mode) or >35s (startup mode) |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); initiates reset and clears watchdog timer when driven low |
| 5 | WDI | Watchdog input; requires rising/falling edge within timeout period to prevent WDO assertion; floating state does not disable watchdog |
| 6 | VCC1 | Primary supply input; powers device and feeds VCC1 comparator; threshold set to +2.925V for this variant |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneously supervises +2.925V and +2.188V rails with independent comparators and shared reset output |
| Push-pull RST and WDO outputs | Eliminates external pullup resistors, reduces BOM count, and ensures clean logic-level transitions into µP reset and NMI inputs |
| Guaranteed reset validity to VCC = +0.8V | Ensures deterministic reset assertion even during deep brownout conditions where many supervisors fail |
| Immunity to short VCC transients | Rejects glitches ≤10µs (at 100mV overdrive), preventing spurious resets in noisy power environments |
| Low 14µA supply current | Enables use in always-on subsystems and battery-backed applications without measurable impact on standby runtime |
Applications
| Telecom Line Card Power Supervision | Industrial PLC CPU Module |
|---|---|
|
Use Scenario: Monitoring +3.3V control logic and +2.2V FPGA I/O banks on a carrier-grade line card with hot-swap capability. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting synchronized reset to ARM Cortex-A9 and FPGA configuration logic during power ramp-up and brownout. Use Value: Prevents metastability and configuration corruption by enforcing 140–280ms reset hold time aligned with FPGA configuration clock stability requirements. |
Use Scenario: Ensuring deterministic restart of a modular PLC CPU after AC mains interruption or DC bus sag. IC Role / Device Role / Timing Role: Primary reset generator for dual-supply microcontroller (VDD_CORE = +2.9V, VDD_IO = +2.2V), interfacing directly to bidirectional reset pin via 10kΩ series resistor. Use Value: Guarantees reset assertion down to +0.8V VCC, enabling safe recovery from partial undervoltage events without requiring external reset extenders. |
| Network Router Control Plane | Medical Diagnostic Imaging Subsystem |
|
Use Scenario: Supervising +3.0V switch fabric controller and +2.2V PHY interface voltage in a multi-slot chassis router. IC Role / Device Role / Timing Role: Dual-threshold supervisor triggering coordinated reset across ASICs and FPGAs during power sequencing faults. Use Value: Push-pull RST output drives multiple loads simultaneously without signal degradation, eliminating need for reset buffer ICs. |
Use Scenario: Providing fail-safe reset to an FPGA-based image processing module powered by isolated +2.9V and +2.2V supplies in MRI front-end electronics. IC Role / Device Role / Timing Role: Safety-critical reset source with watchdog-enforced software liveness checking on real-time image acquisition firmware. Use Value: 35s watchdog startup delay allows full FPGA configuration and DDR calibration before watchdog enforcement begins, avoiding false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6732UTSYD3-T | Same pinout and thresholds (+2.925V/+2.188V), but open-drain RST output requiring external pullup | Suitable where µP reset pin is open-drain compatible or where level translation is needed | Select MAX6732UTSYD3-T only if system design already includes pullup resistors or requires isolation between supervisor and µP reset net |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only), no VCC2 monitor, no manual reset input, 200ms fixed timeout | Limited to single-rail systems; lacks dual-monitoring capability required for mixed-voltage designs | Use TPS3808G33DBVR only when supervising one supply and cost is prioritized over flexibility and redundancy |
Compared with MAX6732UTSYD3-T, MAX6733UTSYD3 offers direct-drive reset capability and simplified layout; compared with TPS3808G33DBVR, it provides essential dual-rail monitoring and manual reset support critical for complex embedded systems.
Availability
MAX6733UTSYD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, network routers, and medical imaging subsystems requiring stable component supply and long-term production continuity.
Supply support for MAX6733UTSYD3 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, communications, and computing applications.
The MAX6730–MAX6735 family was engineered specifically for robust, low-power dual- and triple-voltage microprocessor supervision in space-constrained, high-reliability systems.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6733UTSYD3?
The MAX6733UTSYD3 has factory-set reset thresholds of +2.925V for VCC1 and +2.188V for VCC2, as defined by the "SY" suffix per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over –40°C to +85°C with ±1.5% tolerance and 20ppm/°C tempco, ensuring stable operation across industrial temperature ranges.
Does MAX6733UTSYD3 include a manual reset input?
No, MAX6733UTSYD3 does not include a manual reset (MR) input. Per the Selector Guide and Pin Description, MR is present only on MAX6730/MAX6731/MAX6734/MAX6735 variants. MAX6733UTSYD3 is a dual-supply supervisor with watchdog and push-pull outputs but no MR pin - pin 4 is unused in this variant.
What is the watchdog timeout behavior of MAX6733UTSYD3 during power-up?
Upon power-up or reset assertion, MAX6733UTSYD3 enters a 35s (minimum) initial watchdog mode before transitioning to the 1.12s (minimum) normal timeout period. This extended startup delay allows full system initialization - including µP boot, memory training, and peripheral configuration - before watchdog enforcement begins.
Can MAX6733UTSYD3 monitor a third voltage rail?
No, MAX6733UTSYD3 cannot monitor a third voltage. Only MAX6734 and MAX6735 variants include the RSTIN pin for adjustable third-rail monitoring (with 626mV internal reference). MAX6733UTSYD3 is strictly a dual-voltage supervisor with dedicated VCC1 and VCC2 inputs and no RSTIN connection.
What package type and dimensions does MAX6733UTSYD3 use?
MAX6733UTSYD3 uses a 6-pin SOT23-6 package (JEDEC MO-178), with body dimensions of 2.90mm × 1.60mm × 1.10mm and gull-wing lead form. It is available in both leaded and lead-free versions, with "+T" denoting RoHS-compliant packaging.
MAX6733UTSYD3 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:
- 2.188V, 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
MAX6733UTSYD3 FAQ
1.How can I place an order for MAX6733UTSYD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6733UTSYD3 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 MAX6733UTSYD3 reliable?
The price and inventory of MAX6733UTSYD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6733UTSYD3 is usually 5 days.
3.What payment methods are accepted for MAX6733UTSYD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6733UTSYD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6733UTSYD3?
MAX6733UTSYD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6733UTSYD3 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 MAX6733UTSYD3?
For technical support, including MAX6733UTSYD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6733UTSYD3 requirements.
6.How does Aetrix verify that MAX6733UTSYD3 is sourced from the original manufacturer or authorized distributors?
All MAX6733UTSYD3 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 MAX6733UTSYD3 meets industry standards.
7.What is the process for return or replacement of MAX6733UTSYD3?
All MAX6733UTSYD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6733UTSYD3, 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 MAX6733UTSYD3 part is unused and in its original packaging.
Return procedure for MAX6733UTSYD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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