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Analog Devices Inc./Maxim Integrated MAX6355SWUT+T
- Part No.:
- MAX6355SWUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6355SWUT+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,890
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Product details
Overview
MAX6355SWUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with open-drain active-low reset output, 2.93V VCC1 threshold, 1.67V VCC2 threshold, and adjustable third-voltage monitoring via RSTIN (1.22V internal reference). It operates from -40°C to +85°C in a 6-pin SOT23 package and supports multivoltage embedded systems requiring reliable power-on reset and undervoltage detection.
For engineers reviewing the MAX6355SWUT+T datasheet, MAX6355SWUT+T pinout, MAX6355SWUT+T application, or MAX6355SWUT+T equivalent, this page delivers verified specifications, validated pin functions, confirmed triple-supply monitoring capability, and real-world design context for industrial controllers, portable instrumentation, and battery-powered multirail systems.
Technical Context
The MAX6355SWUT+T monitors three independent supply rails: VCC1 (2.93V threshold), VCC2 (1.67V threshold), and a third voltage via RSTIN using an internal 1.22V comparator with external resistive divider support. Its reset assertion is guaranteed as long as either VCC1 or VCC2 remains above +1.0V.
It features a debounced TTL/CMOS-compatible manual-reset input (MR), 100ms minimum power-on-reset pulse width, and 20μA typical supply current. Unlike MAX6358–MAX6360 variants, it lacks watchdog timer functionality - confirmed by device family mapping and pin configuration data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.93V ±0.05V (TA = -40°C to +85°C); precise trip point for primary supply monitoring |
| VCC2 Threshold | 1.67V ±0.05V (TA = -40°C to +85°C); enables low-voltage rail supervision (e.g., 1.8V or 1.5V logic) |
| RSTIN Reference | 1.22V ±0.03V internal comparator threshold; allows monitoring of any third voltage via external resistor divider |
| Reset Pulse Width | 100ms minimum; ensures reliable processor initialization across temperature and voltage variations |
| Supply Current | 20μA typical (VCC1=5.5V, VCC2=3.6V); ultra-low quiescent current for battery-critical applications |
| Operating Temp | -40°C to +85°C extended range; qualified for industrial and automotive-adjacent environments |
| Reset Output Type | Active-low open-drain; requires external pull-up for system-level compatibility and voltage translation |
Pinout & Package
MAX6355SWUT+T is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), RoHS-compliant with lead-free termination (+T suffix). The package measures 2.9mm × 1.6mm × 1.1mm and supports reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; asserted when any monitored supply falls below threshold or MR is pulled low |
| 2 | GND | Analog/digital ground reference; must be connected to system common ground plane |
| 3 | MR | Debounced manual-reset input; falling edge forces reset; internally pulled up (~63.5kΩ) to VCC1 |
| 4 | VCC2 | Secondary supply input and monitor rail; powers device if > VCC1; threshold = 1.67V |
| 5 | RSTIN | Adjustable third-voltage monitor input; referenced to VCC1; internal 1.22V comparator enables custom threshold setting |
| 6 | VCC1 | Primary supply input and monitor rail; powers device if > VCC2; threshold = 2.93V |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous supervision of VCC1 (2.93V), VCC2 (1.67V), and third voltage via RSTIN (1.22V ref) - eliminates need for discrete comparators |
| Open-drain RST output | Enables level-shifting and wired-OR reset bus configurations across mixed-voltage systems without additional logic |
| Guaranteed reset validity down to 1.0V | Ensures functional reset assertion even during brownout conditions where VCC1 or VCC2 drops to 1.0V |
| 100ms min POR pulse width | Meets or exceeds ARM Cortex-M, PIC, and STM32 reset timing requirements without external RC delay networks |
| 20μA supply current | Extends battery life in portable instruments and IoT edge nodes; stable over full temperature range |
Applications
| Industrial Controllers | Portable Instrumentation |
|---|---|
Use Scenario: PLC I/O modules with dual 3.3V/1.8V supplies and auxiliary sensor bias rail. IC Role / Device Role / Timing Role: Supervises VCC1 (3.3V), VCC2 (1.8V), and RSTIN-connected 2.5V sensor supply; asserts open-drain RST to halt CPU until all rails stabilize. Use Value: Prevents firmware corruption during partial power loss by ensuring coordinated reset across three critical voltage domains. | Use Scenario: Handheld multimeter with 3.3V MCU core, 1.8V ADC, and 2.8V display backlight driver. IC Role / Device Role / Timing Role: Monitors main 3.3V rail (VCC1), 1.8V logic rail (VCC2), and 2.8V backlight supply (via RSTIN + divider); triggers reset on first fault. Use Value: Eliminates need for three separate supervisors, reducing BOM count and PCB area while maintaining independent trip thresholds. |
| Battery-Powered Edge Nodes | Multivoltage Embedded Systems |
Use Scenario: LoRaWAN sensor node powered by single-cell Li-ion (3.0–4.2V) with buck-boost generating 3.3V, 1.8V, and 1.2V rails. IC Role / Device Role / Timing Role: Uses VCC1 (3.3V), VCC2 (1.8V), and RSTIN (1.2V via divider) to supervise all three regulated outputs; RST drives MCU reset pin directly. Use Value: 20μA quiescent current minimizes standby drain; 100ms POR pulse ensures clean boot after wake-from-sleep transitions. | Use Scenario: FPGA-based motor drive with 5V gate drivers, 3.3V I/O, and 1.2V core, plus isolated feedback supply. IC Role / Device Role / Timing Role: Configured with VCC1=3.3V, VCC2=1.2V, RSTIN monitoring isolated 5V supply; open-drain RST interfaces to FPGA's multi-rail reset controller. Use Value: Single-chip solution replaces discrete supervisor + comparator + voltage divider, improving layout density and thermal reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356SWUT+T | Push-pull RST output referenced to VCC1 (vs. open-drain in MAX6355SWUT+T); identical thresholds and RSTIN specs | Requires no external pull-up; incompatible with wired-OR reset buses or level translation | Select MAX6356SWUT+T only if system uses single-voltage reset domain and no shared reset line |
| TPS3808G33DBVR | Dual-supply monitor (no RSTIN); fixed 3.3V/1.67V thresholds; 350nA IQ; SOT23-6 package | Lacks third-voltage monitoring capability; unsuitable for designs requiring adjustable RSTIN input | Choose TPS3808G33DBVR only for dual-rail systems where RSTIN functionality is unnecessary and ultra-low IQ is critical |
Compared with MAX6355SWUT+T, MAX6356SWUT+T offers push-pull drive but forfeits reset bus flexibility, while TPS3808G33DBVR reduces current draw by 98% but removes the key RSTIN feature - making MAX6355SWUT+T the only option supporting true triple-rail supervision with open-drain interoperability.
Availability
MAX6355SWUT+T is available at Aetrix Electronics and suitable for industrial controllers, portable instrumentation, and battery-powered edge nodes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX6355SWUT+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 product line delivers precision multivoltage supervision for embedded systems where simultaneous monitoring of two or three supply rails is required to ensure deterministic reset behavior and system-level reliability.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6355SWUT+T?
The MAX6355SWUT+T has a factory-set VCC1 threshold of 2.93V (±0.05V over -40°C to +85°C) and a VCC2 threshold of 1.67V (±0.05V over the same range). These values are laser-trimmed during production and documented in the Voltage Threshold Levels table of the MAX6351–MAX6360 datasheet. The "SW" suffix explicitly denotes this threshold pair.
Does the MAX6355SWUT+T include a watchdog timer function?
No, the MAX6355SWUT+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358, MAX6359, and MAX6360 variants within the same family. The MAX6355SWUT+T is specifically designated as a triple-voltage supervisor with RSTIN input but no WDI pin or associated timeout circuitry - confirmed by its pin configuration (Pin 5 = RSTIN, not WDI) and family selector guide.
How is the third voltage monitored using the RSTIN pin on the MAX6355SWUT+T?
The RSTIN pin on the MAX6355SWUT+T connects to an internal 1.22V comparator referenced to VCC1. To monitor a third voltage higher than 1.22V, a resistive divider scales the target voltage down to match the 1.22V threshold. For example, monitoring a 5V rail requires R1/R2 ≈ 3.1:1. The RSTIN input current is ±25nA, enabling high-impedance divider designs without loading error. VRSTIN must not exceed VCC1.
What is the reset output type and drive capability of the MAX6355SWUT+T?
The MAX6355SWUT+T features an active-low open-drain RST output (Pin 1), requiring an external pull-up resistor to the desired logic rail. It sinks up to 1.2mA at VCC ≥ 2.7V (VOL ≤ 0.3V) and 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V). This architecture supports voltage-level translation, wired-OR reset buses, and compatibility with diverse microcontroller reset inputs - a key differentiator from push-pull variants like MAX6356SWUT+T.
Can the MAX6355SWUT+T operate reliably when one supply drops below 1.0V?
Yes - the MAX6355SWUT+T guarantees valid reset output as long as either VCC1 or VCC2 remains above +1.0V. This is a core specification confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V on both supplies, reset behavior is undefined; however, the 1.0V guarantee enables robust operation during deep brownouts where one rail collapses while the other sustains minimal functionality.
MAX6355SWUT+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, 2.93V, 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
MAX6355SWUT+T FAQ
1.How can I place an order for MAX6355SWUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6355SWUT+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 MAX6355SWUT+T reliable?
The price and inventory of MAX6355SWUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6355SWUT+T is usually 5 days.
3.What payment methods are accepted for MAX6355SWUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6355SWUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6355SWUT+T?
MAX6355SWUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6355SWUT+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 MAX6355SWUT+T?
For technical support, including MAX6355SWUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6355SWUT+T requirements.
6.How does Aetrix verify that MAX6355SWUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6355SWUT+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 MAX6355SWUT+T meets industry standards.
7.What is the process for return or replacement of MAX6355SWUT+T?
All MAX6355SWUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6355SWUT+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 MAX6355SWUT+T part is unused and in its original packaging.
Return procedure for MAX6355SWUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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