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Analog Devices Inc./Maxim Integrated MAX6355RWUT+T
- Part No.:
- MAX6355RWUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6355RWUT+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,112
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Product details
Overview
The MAX6355RWUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with open-drain active-low reset output, 2.63V VCC1 threshold, 1.67V VCC2 threshold, and adjustable RSTIN input (1.22V nominal) for monitoring a third supply. It operates from -40°C to +85°C in a 6-pin SOT23 package and supports systems requiring reliable power-on reset, manual reset debouncing, and undervoltage detection across three rails.
For engineers reviewing the MAX6355RWUT+T datasheet, MAX6355RWUT+T pinout, MAX6355RWUT+T application, or MAX6355RWUT+T equivalent, key selection criteria include its dual-supply monitoring capability, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, 100ms minimum reset pulse width, 20µA quiescent current, and compatibility with multivoltage embedded controllers and battery-powered instrumentation.
Technical Context
The MAX6355RWUT+T implements a precision dual-threshold comparator architecture: one internal reference monitors VCC1 at 2.63V (±0.05V over temperature), another monitors VCC2 at 1.67V (±0.05V), and a third adjustable comparator accepts external resistive division via RSTIN with 1.22V ±0.03V trip point. All reset outputs assert when either monitored supply falls below its threshold.
Its open-drain RST output requires an external pull-up and remains valid as long as VCC1 ≥ 1.0V or VCC2 ≥ 1.0V; the RSTIN input is powered by VCC1 and must not exceed it. No watchdog timer or push-pull output is present-this variant excludes WDI and uses open-drain topology per the MAX6355 family designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.63V ±0.05V over -40°C to +85°C - sets precise reset trigger for primary supply rail |
| VCC2 Threshold | 1.67V ±0.05V over -40°C to +85°C - enables reliable monitoring of secondary low-voltage rail (e.g., 1.8V core) |
| RSTIN Threshold | 1.22V ±0.03V - allows external resistor divider to monitor third voltage (e.g., 3.3V, 5V) with sub-1% accuracy |
| Reset Pulse Width | 100ms minimum - ensures sufficient duration for μP initialization and peripheral stabilization |
| Supply Current | 20µA typical - enables use in always-on, battery-critical applications without significant drain |
| Operating Temp | -40°C to +85°C - qualified for industrial and extended-temperature embedded deployments |
| RESET Validity | Guaranteed while VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - maintains functional reset assertion during brownout conditions |
Pinout & Package
MAX6355RWUT+T is housed in a RoHS-compliant 6-pin SOT23 package (U6-1 outline), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted. Pin 1 is RST (open-drain), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is VCC2, Pin 5 is RSTIN (adjustable comparator input), and Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low open-drain reset output | Requires external pull-up; asserts low when any monitored supply fails; compatible with 1.8V–5.5V logic levels |
| 2 - GND | Ground reference | Common return for all internal comparators and digital logic; must be low-impedance |
| 3 - MR | Debounced manual-reset input | Pull low to force reset; internally debounced; valid over full VCC1 range; no external RC needed |
| 4 - VCC2 | Secondary supply input & monitor rail | Supplies device when > VCC1; monitored at 1.67V threshold; powers internal VCC2 comparator |
| 5 - RSTIN | Adjustable undervoltage comparator input | Accepts external resistive divider; referenced to VCC1; trip point = 1.22V × (1 + R1/R2) |
| 6 - VCC1 | Primary supply input & monitor rail | Supplies device when > VCC2; monitored at 2.63V threshold; powers RSTIN circuitry and logic |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises VCC1 (2.63V), VCC2 (1.67V), and third rail via RSTIN - eliminates need for discrete supervisors in multirail systems |
| Adjustable third-rail threshold | RSTIN input with 1.22V internal reference enables precise monitoring of arbitrary voltages (e.g., 3.3V, 5V) using two external resistors |
| Low-power operation | 20µA supply current enables integration into energy-sensitive portable and IoT edge nodes without compromising battery life |
| Brownout-resilient reset | RESET remains valid down to VCC1 = 1.0V or VCC2 = 1.0V - ensures deterministic behavior during deep supply sag |
| No external components required | Factory-trimmed thresholds, integrated glitch filtering, and debounced MR eliminate capacitors, resistors, and timing ICs in basic supervision circuits |
Applications
| Industrial PLC Controller Power Monitoring | Portable Medical Sensor Node |
|---|---|
Use Scenario: Supervising 3.3V I/O, 1.8V core, and 5V analog supply in a programmable logic controller with isolated field I/O. IC Role / Device Role / Timing Role: Triple-rail supervisor asserting open-drain reset to ARM Cortex-M7 MCU and FPGA configuration logic upon any rail failure. Use Value: Prevents partial initialization and metastability by guaranteeing synchronized reset across all domains, even during asymmetric brownouts. | Use Scenario: Battery-powered ECG front-end with 3.0V ADC reference, 1.2V sensor bias, and 2.8V BLE radio supply. IC Role / Device Role / Timing Role: Monitoring VCC1 (3.0V), VCC2 (1.2V), and third rail (2.8V via RSTIN divider) to trigger system shutdown before data corruption occurs. Use Value: Enables single-chip supervision of heterogeneous voltage domains, reducing BOM count and PCB area versus discrete solutions. |
| Automotive Body Control Module | Smart Energy Meter with Dual Supply |
Use Scenario: Monitoring 5V microcontroller supply, 3.3V CAN transceiver rail, and 1.8V EEPROM interface in a body control unit operating across automotive temperature range. IC Role / Device Role / Timing Role: Providing fail-safe reset signal to Infineon AURIX TC3xx MCU and TI SN65HVD230 transceiver when any rail drops below specification. Use Value: Meets ASIL-B readiness requirements via guaranteed reset assertion at 1.0V supply, supporting safe state entry during transient faults. | Use Scenario: Two-rail meter SoC (3.3V digital, 1.2V analog) plus auxiliary 5V RTC backup supply in utility-grade smart meter. IC Role / Device Role / Timing Role: Using RSTIN to monitor 5V RTC rail while VCC1 (3.3V) and VCC2 (1.2V) supervise main domains; open-drain RST drives shared reset bus. Use Value: Eliminates need for separate supervisor on backup rail, simplifying design and improving long-term reliability under intermittent power conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356RWUT+T | Push-pull RST output referenced to VCC1; same thresholds and RSTIN capability | Requires no external pull-up; incompatible with wired-OR reset buses | Select when driving single-load MCU reset pin directly and board space prohibits pull-up resistor |
| TPS3808G33DBVR | Dual-supply monitor only (no RSTIN); 3.3V fixed VDD threshold; 1.2V adjustable input via external resistor | Lacks dedicated third-rail monitoring; requires additional external resistor network for third voltage | Select when only two rails require supervision and cost sensitivity outweighs triple-monitoring convenience |
Compared with MAX6355RWUT+T, MAX6356RWUT+T offers push-pull drive but forfeits reset bus sharing, while TPS3808G33DBVR reduces integration by omitting native third-rail support-making MAX6355RWUT+T optimal for compact, fully self-contained triple-rail supervision.
Availability
MAX6355RWUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical sensors, automotive body control modules, and smart energy meters requiring stable component supply and guaranteed long-term availability.
Supply support for MAX6355RWUT+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 high-performance analog and mixed-signal semiconductor solutions for industrial, communications, computing, and consumer markets.
The MAX6351–MAX6360 product line delivers precision multivoltage supervision for embedded systems where reliability, low power, and minimal external components are critical - targeting applications from battery-powered IoT endpoints to automotive ECUs.
FAQ
What is the function of the RSTIN pin on the MAX6355RWUT+T?
The RSTIN pin on the MAX6355RWUT+T is an adjustable undervoltage comparator input with a factory-trimmed 1.22V threshold. It enables monitoring of a third supply rail (e.g., 3.3V or 5V) using an external resistive voltage divider. The input is powered by VCC1 and must remain ≤ VCC1. When the divided voltage falls below 1.22V, the MAX6355RWUT+T asserts its open-drain RST output. This feature eliminates the need for a second supervisor IC in multirail systems.
Does the MAX6355RWUT+T include a watchdog timer?
No, the MAX6355RWUT+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6355RWUT+T is specifically configured for triple-voltage supervision only - monitoring VCC1 (2.63V), VCC2 (1.67V), and a third rail via RSTIN - with no WDI pin or associated timeout circuitry. Its pin 5 is RSTIN, not WDI.
What is the minimum supply voltage required for valid reset assertion on the MAX6355RWUT+T?
The MAX6355RWUT+T guarantees valid reset assertion as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. This brownout resilience ensures the RST output remains functional during severe supply sags - for example, if VCC1 drops from 3.0V to 1.1V while VCC2 holds at 1.7V, the device continues to monitor both rails and assert reset if either falls below its threshold. This specification is fully tested and guaranteed over the -40°C to +85°C temperature range.
Can the MAX6355RWUT+T be used with a 1.8V VCC2 supply?
Yes, the MAX6355RWUT+T supports VCC2 = 1.8V, as its specified VCC2 threshold is 1.67V (with ±0.05V tolerance), well within the 1.8V rail's nominal range. The device operates correctly with VCC2 between 1.2V and 5.5V, and the 1.67V threshold provides appropriate margin for detecting undervoltage on a 1.8V system. However, note that VCC2 must remain ≥ 1.0V for RESET validity - so sustained operation below 1.0V will disable supervision.
Is the MAX6355RWUT+T pin-compatible with other MAX635x variants in the 6-pin SOT23 package?
No, the MAX6355RWUT+T is not fully pin-compatible with all 6-pin SOT23 variants in the MAX635x family. While it shares the same physical package and pin 1 (RST), pin 5 is RSTIN (not WDI as in MAX6358/MAX6359/MAX6360, nor RST2 as in MAX6351). Substituting without verifying pin function alignment risks incorrect operation - e.g., connecting WDI signals to RSTIN will not initiate watchdog reset. Always consult the specific pin description table for each variant before replacement.
MAX6355RWUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.67V, 2.63V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6355RWUT+T FAQ
1.How can I place an order for MAX6355RWUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6355RWUT+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 MAX6355RWUT+T reliable?
The price and inventory of MAX6355RWUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6355RWUT+T is usually 5 days.
3.What payment methods are accepted for MAX6355RWUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6355RWUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6355RWUT+T?
MAX6355RWUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6355RWUT+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 MAX6355RWUT+T?
For technical support, including MAX6355RWUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6355RWUT+T requirements.
6.How does Aetrix verify that MAX6355RWUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6355RWUT+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 MAX6355RWUT+T meets industry standards.
7.What is the process for return or replacement of MAX6355RWUT+T?
All MAX6355RWUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6355RWUT+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 MAX6355RWUT+T part is unused and in its original packaging.
Return procedure for MAX6355RWUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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