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Analog Devices Inc./Maxim Integrated MAX6355SVUT+T
- Part No.:
- MAX6355SVUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6355SVUT+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,568
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Product details
Overview
MAX6355SVUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with open-drain active-low reset output, 2.93V VCC1 threshold, 1.58V VCC2 threshold, and adjustable RSTIN input (1.22V nominal) for monitoring a third voltage rail. It operates from -40°C to +85°C in a 6-pin SOT23 package and supports multivoltage embedded systems requiring precise power-rail sequencing and fault detection.
For engineers reviewing the MAX6355SVUT+T datasheet, MAX6355SVUT+T pinout, MAX6355SVUT+T application, or MAX6355SVUT+T equivalent, key selection criteria include its dual-supply monitoring capability, RSTIN-based third-voltage sensing, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, and compatibility with low-voltage logic interfaces in portable and industrial control designs.
Technical Context
The MAX6355SVUT+T monitors three independent supply rails: VCC1 (2.93V threshold), VCC2 (1.58V threshold), and an external voltage via RSTIN (1.22V comparator reference). Its reset assertion is triggered if any monitored rail falls below its trip point, and the open-drain RST output remains valid as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V.
Unlike watchdog-equipped variants (e.g., MAX6358–MAX6360), the MAX6355SVUT+T lacks WDI functionality but includes dedicated RSTIN with ±25nA input current and 2.5mV hysteresis-enabling accurate third-rail monitoring using an external resistive divider without additional ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.93V (factory-set, ±0.05V over -40°C to +85°C); enables reliable supervision of +3.0V or +2.93V system rails |
| VCC2 Threshold | 1.58V (factory-set, ±0.05V over -40°C to +85°C); supports supervision of +1.6V/1.5V core or I/O supplies |
| RSTIN Threshold | 1.22V (±0.03V over temperature); allows precise third-rail monitoring via external resistor divider |
| Supply Current | 20µA (typical at VCC1=5.5V, VCC2=3.6V); ensures ultra-low quiescent power in battery-powered systems |
| Reset Timeout | 100ms minimum pulse width; meets standard µP reset timing requirements for stable initialization |
| Operating Temp | -40°C to +85°C extended range; qualified for industrial and automotive-adjacent embedded applications |
| Package | 6-pin SOT23 (U6-1 footprint); compatible with high-density PCB layouts and automated assembly |
Pinout & Package
MAX6355SVUT+T is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175) with exposed pad not electrically connected. The package supports reflow soldering per JEDEC J-STD-020 and is RoHS-compliant (indicated by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low open-drain reset output | Drives low during fault; requires external pull-up; compatible with 1.8V–5.5V logic families |
| 2 - GND | Ground reference | Common return path for all internal circuits and monitored supplies |
| 3 - MR | Debounced manual-reset input | Pull low to force reset; internally debounced; valid at VCC1 ≥ 1.0V |
| 4 - VCC2 | Secondary supply input & monitor | Power source and monitored rail; threshold = 1.58V; must be ≤ VCC1 |
| 5 - RSTIN | Adjustable undervoltage-comparator input | Monitors third rail via 1.22V internal reference; VRSTIN ≤ VCC1; supports divider-based scaling |
| 6 - VCC1 | Primary supply input & monitor | Primary power source and monitored rail; threshold = 2.93V; powers internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises VCC1 (2.93V), VCC2 (1.58V), and third rail via RSTIN (1.22V ref), eliminating need for discrete comparators in multirail systems |
| Open-drain RST output | Enables wired-OR reset bus sharing across multiple supervisors or logic domains without contention |
| RSTIN with precision reference | 1.22V ±0.03V internal comparator reference enables accurate third-rail monitoring with <2.5mV hysteresis and ±25nA input bias |
| Low-power operation | 20µA typical supply current allows integration into always-on subsystems without compromising battery life |
| Extended temperature support | Guaranteed operation from -40°C to +85°C with full electrical specs, suitable for industrial control and outdoor electronics |
Applications
| Industrial PLC Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Monitoring 3.0V CPU core, 1.6V FPGA I/O, and 2.5V sensor interface rails in a compact programmable logic controller. IC Role / Device Role / Timing Role: Triple-rail supervisor asserting open-drain RST to hold processor in reset until all supplies stabilize within tolerance. Use Value: Prevents erratic firmware execution due to partial power-up; eliminates need for three separate voltage monitors and reduces BOM count by 2 ICs. | Use Scenario: Power sequencing and fault detection in handheld ECG monitors powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Supervises 2.9V analog front-end, 1.55V MCU core, and 3.3V display driver using RSTIN divider to scale 3.3V rail to 1.22V reference. Use Value: Ensures safe shutdown before brownout-induced data corruption; 20µA quiescent current extends battery runtime beyond 72 hours in standby mode. |
| Automotive Infotainment Gateways | Smart Energy Meters |
Use Scenario: Validating 3.0V SoC supply, 1.6V memory interface, and 5.0V CAN transceiver rail in a vehicle gateway module operating near engine bay temperatures. IC Role / Device Role / Timing Role: Dual-supply monitor with RSTIN used to track 5.0V rail via 4.1kΩ/2.0kΩ divider; asserts RST if any rail drops below threshold. Use Value: Maintains RESET validity down to VCC1 = 1.0V or VCC2 = 1.0V, enabling robust reset assertion even during cold-crank voltage sag events. | Use Scenario: Supervising 3.0V metrology ASIC, 1.55V real-time clock, and 3.3V communication interface in a Class 0.5S electricity meter. IC Role / Device Role / Timing Role: Provides 100ms min reset pulse width and factory-trimmed thresholds to meet IEC 62056-6-2 power-fail response requirements. Use Value: Guarantees deterministic reset behavior across -40°C to +85°C without calibration; eliminates field failures from marginal supply 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 |
|---|---|---|---|
| MAX6356SVUT+T | Push-pull RST output referenced to VCC1 (vs. open-drain on MAX6355SVUT+T); same thresholds and RSTIN capability | Requires no external pull-up; incompatible with wired-OR reset buses | Select when driving a single load directly and minimizing external components |
| TPS3808G33DBVR | Dual-voltage supervisor only (no RSTIN); 3.3V/1.8V fixed thresholds; 350ms reset timeout; 2.5µA supply current | Lacks third-rail monitoring; lower quiescent current but longer reset delay | Select for simpler dual-rail systems where RSTIN functionality is unnecessary and ultra-low IQ is critical |
Compared with MAX6356SVUT+T, MAX6355SVUT+T offers open-drain flexibility for shared reset lines but requires a pull-up resistor; compared with TPS3808G33DBVR, it adds RSTIN-based third-rail supervision at higher IQ and shorter reset timeout-making it optimal for complex multivoltage systems needing precise, configurable fault detection.
Availability
MAX6355SVUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical devices, automotive infotainment gateways, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6355SVUT+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX6351–MAX6360 family delivers precision multivoltage supervision for embedded systems where reliability depends on coordinated power-rail monitoring and deterministic reset generation across diverse supply domains.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6355SVUT+T?
The MAX6355SVUT+T has a factory-set VCC1 threshold of 2.93V, with guaranteed tolerance of ±0.05V over the full -40°C to +85°C operating temperature range. This value is specified in the Voltage Threshold Levels table and confirmed in the Electrical Characteristics section under VTH1 for "MAX63__S_" suffix devices. The 2.93V threshold enables reliable supervision of +3.0V system rails while accommodating typical supply tolerances.
Does the MAX6355SVUT+T include a watchdog timer function?
No, the MAX6355SVUT+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6355SVUT+T is specifically designed as a triple-voltage supervisor with RSTIN input for third-rail monitoring but omits WDI circuitry-reducing complexity and cost for applications where software-level watchdog supervision is handled externally.
How is the third voltage monitored using RSTIN on the MAX6355SVUT+T?
The MAX6355SVUT+T uses its RSTIN pin with a precise 1.22V internal comparator reference to monitor a third voltage rail. To supervise a higher voltage (e.g., 3.3V), an external resistive divider scales the input so that the voltage at RSTIN equals 1.22V when the target rail reaches its desired trip point. The MAX6355SVUT+T datasheet provides the formula VEXT = 1.22V × (R1 + R2)/R2 and specifies RSTIN input current as ±25nA, ensuring minimal loading on the divider network.
What is the function of Pin 1 (RST) on the MAX6355SVUT+T, and what drive capability does it have?
Pin 1 of the MAX6355SVUT+T is the active-low open-drain RST output. It pulls low during reset assertion and floats high otherwise, requiring an external pull-up resistor. Its VOL is guaranteed ≤0.3V at ISINK = 50µA when VCC1 or VCC2 ≥ 1.2V over temperature, supporting reliable interfacing with 1.8V, 2.5V, 3.3V, and 5V logic families. This open-drain architecture enables wired-OR connection with other reset sources on a shared reset bus.
Can the MAX6355SVUT+T operate with VCC1 and VCC2 supplied from different voltage sources?
Yes, the MAX6355SVUT+T is explicitly designed to monitor two independent supply rails: VCC1 and VCC2. Both pins can be driven from separate regulators or power domains, provided VCC2 ≤ VCC1 (as stated in the Absolute Maximum Ratings and Pin Description sections). The device guarantees valid reset output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, making it suitable for asymmetric multivoltage systems such as those combining a 3.0V main rail and a 1.6V low-power domain.
MAX6355SVUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.58V, 2.93V, 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
MAX6355SVUT+T FAQ
1.How can I place an order for MAX6355SVUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6355SVUT+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 MAX6355SVUT+T reliable?
The price and inventory of MAX6355SVUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6355SVUT+T is usually 5 days.
3.What payment methods are accepted for MAX6355SVUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6355SVUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6355SVUT+T?
MAX6355SVUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6355SVUT+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 MAX6355SVUT+T?
For technical support, including MAX6355SVUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6355SVUT+T requirements.
6.How does Aetrix verify that MAX6355SVUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6355SVUT+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 MAX6355SVUT+T meets industry standards.
7.What is the process for return or replacement of MAX6355SVUT+T?
All MAX6355SVUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6355SVUT+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 MAX6355SVUT+T part is unused and in its original packaging.
Return procedure for MAX6355SVUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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