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Analog Devices Inc./Maxim Integrated MAX6733AUTLTD3+
- Part No.:
- MAX6733AUTLTD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6733AUTLTD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:252
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Product details
Overview
MAX6733AUTLTD3+ from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull reset and watchdog outputs, factory-set VCC1 = +4.625V and VCC2 = +3.075V thresholds, 210ms reset timeout, and -40°C to +125°C operation. It monitors two fixed supply rails in embedded systems and asserts active-low RST/WDO when either drops below threshold or during manual reset.
For engineers reviewing the MAX6733AUTLTD3+ datasheet, MAX6733AUTLTD3+ pinout, MAX6733AUTLTD3+ application, or MAX6733AUTLTD3+ equivalent, key selection criteria include dual-supply monitoring accuracy, push-pull output drive capability, guaranteed reset validity down to VCC = +0.8V, and immunity to sub-100ns VCC transients in industrial power-up sequences.
Technical Context
The MAX6733AUTLTD3+ implements independent dual-threshold comparators for VCC1 and VCC2, each with 20ppm/°C tempco and 0.5% hysteresis referenced to typical threshold. Its reset logic combines voltage fault detection, manual reset assertion (MR), and watchdog timeout events into a single RST output that remains asserted for the full 210ms timeout after all conditions clear.
It features a dual-mode watchdog timer: 35s minimum startup delay after reset enables safe system initialization, followed by 1.12s minimum normal-mode timeout on WDI edge detection. The push-pull RST and WDO outputs eliminate external pullups and support direct interfacing with µP reset I/O pins via 10kΩ isolation resistors where bidirectional contention is possible.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +4.625V nominal (LT suffix), ±125mV over temperature - sets precise brownout point for primary 5V/4.8V rail |
| VCC2 Threshold | +3.075V nominal (LT suffix), ±75mV over temperature - matches common 3.3V I/O or memory supply |
| Reset Timeout | 210ms nominal (D3 suffix), 140–280ms range - ensures sufficient hold time for slow-starting peripherals |
| Supply Current | 14µA typical at +3.6V - enables battery-backed operation for >10 years in always-on monitoring |
| Watchdog Timeout | 1.12s min normal mode, 35s min startup - accommodates boot firmware execution before watchdog enforcement |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom line-card environments |
| RST Output Type | Active-low push-pull - drives high/low without external components; supports 800µA VOH at VCC1 ≥ +4.5V |
Pinout & Package
MAX6733AUTLTD3+ is housed in a 6-pin SOT23-6 package (U6-1) with 1.6mm × 2.9mm footprint and 1.1mm max height, optimized for space-constrained PCB layouts in portable and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low on VCC1/VCC2 undervoltage, MR low, or watchdog timeout; valid down to VCC = +0.8V |
| 2 - GND | Ground reference | Common return for all internal comparators, watchdog logic, and output drivers; requires low-impedance connection |
| 3 - WDO | Active-low watchdog output | Push-pull driver; asserts low if no WDI edge occurs within 1.12s (normal) or 35s (startup); deasserts immediately when condition clears |
| 4 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width; forces RST low and clears watchdog counter |
| 5 - WDI | Watchdog input | Edge-sensitive input; rising/falling transitions reset watchdog timer; floating state does not disable function; 50ns min pulse width |
| 6 - VCC1 | Primary supply input | Powers device and feeds VCC1 comparator; threshold set to +4.625V; must be ≥ VCC2 for proper biasing of internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneous +4.625V and +3.075V thresholds eliminate need for external resistor dividers or secondary supervisors |
| Guaranteed reset validity to +0.8V | Ensures clean reset assertion during deep brownout or battery discharge down to 0.8V on VCC1 or VCC2 |
| Immunity to short VCC transients | Rejects falling glitches <100ns wide at 100mV overdrive - prevents spurious resets during switching noise or load dumps |
| Low 14µA supply current | Reduces standby power in always-on systems; enables use in energy-harvesting or coin-cell applications |
| Independent watchdog output | WDO operates separately from RST, allowing watchdog-triggered recovery actions (e.g., NMI interrupt) without full system reset |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Monitoring 5V backplane and 3.3V FPGA I/O supplies in a field-deployed programmable logic controller exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring deterministic reset during cold start, brownout, or software hang; push-pull RST directly drives µP reset pin. Use Value: 210ms reset timeout guarantees FPGA configuration completion before release; -40°C to +125°C rating ensures reliability in uncontrolled enclosures. |
Use Scenario: Power sequencing and fault detection for hot-swappable line cards in carrier-grade Ethernet switches with redundant 5V/3.3V supplies. IC Role / Device Role / Timing Role: Supervisor providing coordinated reset across multiple ASICs and PHYs; WDO used for watchdog-triggered card-level diagnostics. Use Value: Independent WDO allows non-disruptive watchdog response (e.g., register dump) while RST holds system in reset until root cause is resolved. |
| Medical Diagnostic Imaging | Automotive ADAS ECU |
Use Scenario: Ensuring reliable boot and runtime supervision of dual-core ARM processor and DDR3 memory in portable ultrasound equipment. IC Role / Device Role / Timing Role: Dual-supply monitor for +4.625V analog front-end and +3.075V digital core; MR enables technician-initiated recalibration reset. Use Value: Push-pull outputs eliminate pullup resistors in high-density BGA layout; 14µA quiescent current extends battery life between charges. |
Use Scenario: Supervising 5V sensor interface and 3.3V radar processor supplies in an autonomous driving control unit operating near engine compartments. IC Role / Device Role / Timing Role: High-temp supervisor asserting RST on voltage sag during cranking; WDO monitors radar firmware execution integrity. Use Value: Guaranteed operation to +125°C and 35s watchdog startup delay accommodate extended engine warm-up periods before safety-critical code execution. |
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+ | Open-drain RST output; identical VCC1/VCC2 thresholds and D3 timeout; same SOT23-6 package | Requires external pullup resistor; suitable where reset signal must be wire-OR'd with other sources | Select when system architecture mandates open-drain reset bus sharing or level translation |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); 200ms timeout; 1.8V to 6.5V VDD range; different pinout (SOT23-6) | Lacks VCC2 monitoring; no manual reset input; no independent watchdog output | Choose only for simplified 3.3V-only systems where dual-rail supervision is unnecessary |
Compared with MAX6732AUTLTD3+, the MAX6733AUTLTD3+ provides stronger reset drive and eliminates pullup component cost, while TPS3808G33DBVR reduces functionality to single-rail monitoring-making MAX6733AUTLTD3+ optimal for dual-supply systems requiring robust, self-contained reset control.
Availability
MAX6733AUTLTD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical imaging devices, and automotive ADAS ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6733AUTLTD3+ 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, automotive, and communications applications, with emphasis on reliability, low power, and high integration.
The MAX6730A–MAX6735A family delivers compact, multi-rail supervision with independent watchdog capability, targeting systems where simultaneous monitoring of primary and secondary supplies is critical to functional safety and uptime.
FAQ
What are the exact reset threshold voltages for MAX6733AUTLTD3+?
The MAX6733AUTLTD3+ has factory-set VCC1 threshold of +4.625V (±125mV) and VCC2 threshold of +3.075V (±75mV), per the LT suffix in its part number. These values are guaranteed over the full -40°C to +125°C temperature range with 20ppm/°C tempco and 0.5% hysteresis, enabling precise brownout detection for 5V and 3.3V rails without calibration.
Does MAX6733AUTLTD3+ support manual reset functionality?
Yes, MAX6733AUTLTD3+ includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces RST assertion and clears the watchdog timer. The MR pin accepts CMOS logic levels and requires only a 1µs minimum pulse width, supporting momentary switch interfaces without external debounce circuitry.
What is the watchdog timeout behavior of MAX6733AUTLTD3+ during power-up?
MAX6733AUTLTD3+ implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR), it enters a 35s minimum startup delay before enforcing the normal 1.12s timeout. This allows complex boot sequences to complete before watchdog supervision begins, preventing false timeouts during firmware initialization.
How does the push-pull RST output of MAX6733AUTLTD3+ differ from open-drain alternatives?
The push-pull RST output of MAX6733AUTLTD3+ actively drives both high and low states without external components, delivering VOH ≥ 0.8×VCC1 at 800µA and VOL ≤ 0.4V at 3.2mA. This eliminates pullup resistors, reduces BOM count, improves noise immunity, and enables direct connection to µP reset pins-even bidirectional ones when isolated with a 10kΩ series resistor.
Is MAX6733AUTLTD3+ qualified for automotive under-hood applications?
MAX6733AUTLTD3+ is fully specified from -40°C to +125°C and features guaranteed reset validity down to VCC = +0.8V, making it suitable for automotive ADAS ECUs near engine compartments. While not AEC-Q100 certified out-of-box, its temperature range, transient immunity, and supply current (14µA typ) align with under-hood supervisory requirements when validated per customer qualification protocols.
MAX6733AUTLTD3+ 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:
- 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-23-6
MAX6733AUTLTD3+ FAQ
1.How can I place an order for MAX6733AUTLTD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6733AUTLTD3+ 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+ reliable?
The price and inventory of MAX6733AUTLTD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6733AUTLTD3+ is usually 5 days.
3.What payment methods are accepted for MAX6733AUTLTD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6733AUTLTD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6733AUTLTD3+?
MAX6733AUTLTD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6733AUTLTD3+ 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+?
For technical support, including MAX6733AUTLTD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6733AUTLTD3+ requirements.
6.How does Aetrix verify that MAX6733AUTLTD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6733AUTLTD3+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6733AUTLTD3+?
All MAX6733AUTLTD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6733AUTLTD3+, 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+ part is unused and in its original packaging.
Return procedure for MAX6733AUTLTD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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