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Analog Devices Inc./Maxim Integrated MAX6355RVUT+
- Part No.:
- MAX6355RVUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6355RVUT+.pdf
- Description:
- MAX6355 TRIPLE-VOLTAGE MICROPROC
- Quantity:
- Payment:
- Shipping:
Inventory:488
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Product details
Overview
The MAX6355RVUT+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with active-low open-drain reset output, 2.63V VCC1 threshold, 1.58V VCC2 threshold, and adjustable third-voltage monitoring input (RSTIN) referenced to VCC1. It operates over –40°C to +85°C in a 6-pin SOT23 package and supports systems requiring independent monitoring of three supply rails-e.g., +3.3V, +1.8V, and a custom analog or I/O rail-in industrial controllers and portable instrumentation.
For engineers reviewing the MAX6355RVUT+ datasheet, MAX6355RVUT+ pinout, MAX6355RVUT+ application, or MAX6355RVUT+ equivalent, key selection criteria include its dual-supply validity down to 1.0V per rail, 100ms minimum reset pulse width, 20µA quiescent current, and RSTIN comparator with 1.22V internal reference for flexible third-rail threshold setting.
Technical Context
The MAX6355RVUT+ integrates two precision voltage comparators for VCC1 and VCC2 supervision plus a dedicated undervoltage-reset comparator input (RSTIN) referenced to VCC1. Its reset assertion logic triggers when any monitored supply falls below its factory-set threshold-2.63V for VCC1 and 1.58V for VCC2-or when RSTIN drops below 1.22V.
It features an active-low open-drain RST output with guaranteed validity as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, enabling robust reset signaling even during deep brownout conditions. The device includes a debounced TTL/CMOS-compatible manual-reset input (MR) and supports no external components for dual- or triple-voltage system supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.63V ±0.05V at +25°C; guarantees reset assertion when primary supply drops below nominal 2.63V rail |
| VCC2 Threshold | 1.58V ±0.03V at +25°C; enables reliable supervision of low-voltage auxiliary rails like 1.5V or 1.8V I/O supplies |
| RSTIN Threshold | 1.22V ±0.03V at +25°C; allows precise third-rail monitoring via external resistive divider (e.g., 3.3V, 2.5V, or custom analog supply) |
| Reset Pulse Width | 100–280ms; ensures sufficient duration to fully reset microcontrollers and peripheral ICs without requiring external timing components |
| Supply Current | 20µA typical at +25°C; minimizes standby power impact in battery-powered equipment and always-on subsystems |
| Operating Temp | –40°C to +85°C; qualified for industrial and extended-temperature embedded applications without derating |
| Reset Validity | Guaranteed while VCC1 ≥ 1.0V or VCC2 ≥ 1.0V; maintains functional reset state during severe supply sag or partial power loss |
Pinout & Package
MAX6355RVUT+ 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 not present. Pin 1 is RST (open-drain), Pin 2 is GND, Pin 3 is MR, Pin 4 is VCC2, Pin 5 is RSTIN, and Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low open-drain reset output | Pulled low to assert reset; requires external pull-up to VCC1 or another compatible rail; compatible with bidirectional µP reset pins via series resistor |
| 2 - GND | Ground reference | Common return path for all internal comparators and logic; must be low-impedance connection to system ground plane |
| 3 - MR | Manual-reset input | Debounced active-low signal; forces reset when pulled ≤0.8V (for L/M suffixes); remains asserted for timeout period after release |
| 4 - VCC2 | Secondary supply input & monitor | Supplies internal circuitry when VCC2 > VCC1; monitored against 1.58V threshold; valid range: 1.2V to 5.5V |
| 5 - RSTIN | Adjustable third-voltage monitor input | Accepts external voltage divider; asserts reset if input falls below 1.22V; powered by VCC1; max input = VCC1 |
| 6 - VCC1 | Primary supply input & monitor | Primary power source and reference; monitored against 2.63V threshold; powers RSTIN and MR logic; valid range: 1.2V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Monitors VCC1 (2.63V), VCC2 (1.58V), and third rail via RSTIN (1.22V ref) - eliminates need for discrete comparators or multiple supervisors |
| Open-drain RST output | Enables wired-OR reset bus configuration and safe interfacing with bidirectional µP reset pins using a single 4.7kΩ series resistor |
| 1.0V supply validity guarantee | Ensures RESET remains logically valid even when either VCC1 or VCC2 sags to 1.0V - critical for brownout resilience in multirail systems |
| 20µA ultra-low supply current | Reduces quiescent power draw in always-on monitoring paths - suitable for battery-backed real-time clocks and sensor nodes |
| No external components required | Factory-trimmed thresholds and integrated glitch filtering eliminate external resistors, capacitors, or RC networks for basic supervision |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
|
Use Scenario: Supervises 3.3V CPU core, 1.8V FPGA I/O, and 2.5V analog front-end in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Triple-rail supervisor asserting open-drain RESET to ARM Cortex-M7, FPGA configuration logic, and ADC driver simultaneously upon any rail fault. Use Value: Prevents firmware corruption and analog measurement errors by ensuring coordinated reset across heterogeneous voltage domains during line transients. |
Use Scenario: Monitors main Li-ion battery rail (3.3V), low-power MCU domain (1.8V), and ECG signal chain supply (2.5V) in handheld patient vital-sign analyzer. IC Role / Device Role / Timing Role: Third-rail monitoring via RSTIN enables precise detection of analog supply droop before sensor offset drift exceeds clinical accuracy limits. Use Value: Guarantees clean power-up sequencing and early brownout detection without adding BOM cost or PCB area for discrete supervision circuits. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: Validates 5V microcontroller supply, 3.3V CAN transceiver rail, and 1.2V sensor interface rail in under-hood body control unit operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Dual-supply validity down to 1.0V ensures RESET remains asserted during cold-crank battery dip (down to 6V system), preventing unsafe MCU operation. Use Value: Meets AEC-Q100 stress test requirements for reset integrity under extreme automotive voltage transients without external clamping diodes. |
Use Scenario: Supervises 3.3V metrology SoC, 1.8V RF transceiver, and backup supercapacitor charging rail (2.7V) in ANSI C12.20-certified electricity meter. IC Role / Device Role / Timing Role: RSTIN input monitors supercap voltage decay to trigger graceful shutdown before nonvolatile memory write failure occurs. Use Value: Enables deterministic last-gasp data logging during mains failure - eliminating risk of corrupted billing registers or tamper-event flags. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356RVUT+ | Push-pull RST output referenced to VCC1; same VCC1/VCC2 thresholds and RSTIN specs | Requires no external pull-up; incompatible with wired-OR reset buses or bidirectional µP pins without buffering | Select when driving a single load directly and minimizing external component count is prioritized over bus flexibility |
| TPS3808G33DBVR | Dual-voltage supervisor only (no RSTIN); 3.3V/1.8V fixed thresholds; 350nA IQ; SOT23-6 | Lacks third-rail monitoring capability; unsuitable where analog or custom supply supervision is required | Choose only for simpler dual-rail systems where RSTIN functionality is unnecessary and ultra-low IQ is critical |
Compared with MAX6355RVUT+, MAX6356RVUT+ offers push-pull drive but forfeits open-drain flexibility, while TPS3808G33DBVR reduces quiescent current by 98% but omits the essential RSTIN feature - making MAX6355RVUT+ the sole option for validated triple-rail supervision with bus-compatible reset signaling.
Availability
MAX6355RVUT+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, smart energy meters, and multivoltage embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6355RVUT+ 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, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing applications.
The MAX6351–MAX6360 family delivers precision multirail supervision with factory-trimmed thresholds and integrated reliability features - engineered specifically for systems where simultaneous monitoring of ≥2 supply domains is mandatory for functional safety and data integrity.
FAQ
What is the function of the RSTIN pin on the MAX6355RVUT+?
The RSTIN pin on the MAX6355RVUT+ is an adjustable third-voltage monitor input with a precise 1.22V internal reference. When an external resistive divider applies a voltage to RSTIN, the MAX6355RVUT+ asserts reset if that voltage falls below 1.22V. This enables supervision of custom or nonstandard supply rails - such as 2.5V analog, 3.3V I/O, or 5V peripherals - without requiring additional comparator ICs. RSTIN is powered by VCC1 and must not exceed VCC1.
Does the MAX6355RVUT+ provide watchdog timer functionality?
No, the MAX6355RVUT+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6355RVUT+ is optimized for triple-voltage supervision only - monitoring VCC1 (2.63V), VCC2 (1.58V), and a third rail via RSTIN - and provides no WDI input or timeout logic. For watchdog capability with identical voltage thresholds, consider MAX6359RVUT+ instead.
What are the absolute maximum ratings for VCC1 and VCC2 on the MAX6355RVUT+?
The absolute maximum rating for both VCC1 and VCC2 on the MAX6355RVUT+ is –0.3V to +6.0V relative to GND. However, the functional operating range is narrower: 1.2V to 5.5V over the full –40°C to +85°C temperature range. Operation outside this range may cause permanent damage or undefined behavior. The device guarantees valid RESET output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - a key reliability feature during brownout conditions.
Can the MAX6355RVUT+ be used in systems with bidirectional microprocessor reset pins?
Yes, the MAX6355RVUT+ can safely interface with bidirectional µP reset pins due to its open-drain RST output. To prevent contention, connect a 4.7kΩ series resistor between the RST pin and the µP's reset I/O port. This limits current during bidirectional transitions and ensures the µP retains control of the line when not in reset. Do not use a pull-up resistor larger than 100kΩ to maintain adequate rise time and noise immunity.
How does the MAX6355RVUT+ ensure reset validity during deep supply sag?
The MAX6355RVUT+ guarantees RESET output validity as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - a design feature that maintains logical reset assertion even during severe brownouts where one or both supplies collapse below their nominal thresholds. This is achieved through internal level-shifting and rail-independent output drivers. Unlike many supervisors that disable RESET below 2.0V, the MAX6355RVUT+ continues asserting reset down to 1.0V, preventing premature MCU wake-up or corrupted state transitions.
MAX6355RVUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.58V, 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-23-6
MAX6355RVUT+ FAQ
1.How can I place an order for MAX6355RVUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6355RVUT+ 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 MAX6355RVUT+ reliable?
The price and inventory of MAX6355RVUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6355RVUT+ is usually 5 days.
3.What payment methods are accepted for MAX6355RVUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6355RVUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6355RVUT+?
MAX6355RVUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6355RVUT+ 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 MAX6355RVUT+?
For technical support, including MAX6355RVUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6355RVUT+ requirements.
6.How does Aetrix verify that MAX6355RVUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6355RVUT+ 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 MAX6355RVUT+ meets industry standards.
7.What is the process for return or replacement of MAX6355RVUT+?
All MAX6355RVUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6355RVUT+, 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 MAX6355RVUT+ part is unused and in its original packaging.
Return procedure for MAX6355RVUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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