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Analog Devices Inc./Maxim Integrated MAX6355TWUT-T
- Part No.:
- MAX6355TWUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6355TWUT-T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,618
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Product details
Overview
MAX6355TWUT-T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with open-drain active-low reset output, 3.08V VCC1 threshold, 1.67V VCC2 threshold, and adjustable third-voltage monitoring input (RSTIN) with 1.22V internal reference. 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 core, +1.8V I/O, and a custom analog rail.
For engineers reviewing the MAX6355TWUT-T datasheet, MAX6355TWUT-T pinout, MAX6355TWUT-T application, or MAX6355TWUT-T equivalent, this device is selected for multivoltage embedded systems where guaranteed reset validity down to VCC1 = 1V or VCC2 = 1V, low 20µA quiescent current, and precise factory-set thresholds are critical for reliable power-on sequencing and fault detection.
Technical Context
The MAX6355TWUT-T implements dual-supply monitoring (VCC1/VCC2) plus a dedicated RSTIN comparator referenced to VCC1, enabling simultaneous supervision of three independent voltage domains. Its reset assertion logic triggers if any monitored supply falls below its specified threshold - VTH1 = 3.08V (±0.08V over temperature), VTH2 = 1.67V (±0.05V), or RSTIN < 1.22V (±0.03V).
It features an open-drain RST output with guaranteed VOL ≤ 0.3V at ISINK = 50µA when VCC ≥ 1.2V, and supports manual reset via debounced MR input. Unlike MAX6358–MAX6360 variants, it excludes watchdog functionality - confirmed by absence of WDI pin and omission from watchdog timing tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.08V ±0.08V (–40°C to +85°C); ensures reliable reset assertion when primary 3.3V rail drops below safe operating level |
| VCC2 Threshold | 1.67V ±0.05V (–40°C to +85°C); enables accurate monitoring of low-voltage rails such as 1.8V or 1.5V I/O supplies |
| RSTIN Threshold | 1.22V ±0.03V (–40°C to +85°C); allows external resistive divider to set custom reset point for third voltage domain |
| Supply Current | 20µA typical (VCC1 = 5.5V, VCC2 = 3.6V); minimizes impact on battery life in portable equipment |
| Reset Timeout | 100ms minimum pulse width; meets JEDEC JESD8-12B requirement for stable processor initialization |
| Operating Temp | –40°C to +85°C extended range; qualified for industrial and automotive under-hood applications |
| Package | 6-pin SOT23 (U6-1); footprint-compatible with standard high-density PCB layouts and automated assembly |
Pinout & Package
MAX6355TWUT-T is housed in a 6-pin SOT23 package (outline 21-0058, land pattern 90-0175), with pins arranged in standard top-view configuration: Pin 1 = RST (open-drain), Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = RSTIN, Pin 6 = VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low open-drain reset output | Pulled low during fault; requires external pull-up for logic-high state; compatible with 1.8V–5.5V host logic |
| 2 - GND | Ground reference | Common return path for all internal comparators and reset generator; must be low-impedance |
| 3 - MR | Debounced manual-reset input | Pull low to force reset; internally pulled up (~63.5kΩ); glitch rejection >100ns |
| 4 - VCC2 | Secondary supply input & monitor | Monitors 1.67V rail; powers internal circuitry when VCC2 > VCC1; valid down to 1.0V |
| 5 - RSTIN | Adjustable undervoltage-comparator input | Accepts external voltage divider; asserts reset if input falls below 1.22V; powered by VCC1 |
| 6 - VCC1 | Primary supply input & monitor | Monitors 3.08V rail; powers internal circuitry when VCC1 > VCC2; valid down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC1 (3.08V), VCC2 (1.67V), and third rail via RSTIN (1.22V ref) - eliminates need for discrete comparators |
| Guaranteed reset validity | RST remains functional as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - ensures fail-safe behavior during brownout |
| Factory-trimmed thresholds | VTH1 = 3.08V and VTH2 = 1.67V calibrated at wafer test; ±0.08V/±0.05V tolerance over full temperature range |
| Low-power operation | 20µA supply current enables use in always-on subsystems without compromising battery runtime |
| No external components required | Integrated comparators, glitch filter, and reset timer eliminate external RC networks and reduce BOM count |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
|
Use Scenario: Supervises 3.3V CPU core, 1.8V FPGA I/O, and 2.5V sensor analog supply in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting open-drain RST to ARM Cortex-M7 during any rail collapse; RSTIN monitors sensor rail via 2.5V-to-1.22V resistor divider. Use Value: Prevents undefined MCU state during partial power loss; 100ms reset pulse ensures complete register initialization before firmware execution. |
Use Scenario: Monitors battery-backed 3.3V system rail, 1.2V ADC reference, and 1.8V display interface in handheld ECG device. IC Role / Device Role / Timing Role: Detects undervoltage on all three rails; RST output drives reset line of ultra-low-power MSP430; MR enables clinician-initiated hard reset. Use Value: Guarantees deterministic shutdown when battery drops below 3.0V while maintaining RST validity down to 1.0V - avoids data corruption during final discharge phase. |
| Automotive Infotainment Head Unit | Smart Energy Meter |
|
Use Scenario: Validates 5V USB-powered MCU, 3.3V CAN transceiver, and 1.2V RF SoC supply in dashboard display module. IC Role / Device Role / Timing Role: Uses VCC1 = 3.3V (CAN), VCC2 = 1.67V (scaled 1.2V rail), RSTIN for 5V USB monitoring; RST tied to processor's nRESET. Use Value: Meets AEC-Q100 Grade 3 thermal requirements; 20µA ICC enables continuous supervision without draining backup capacitor. |
Use Scenario: Ensures reliable startup and fault recovery across 3.3V microcontroller, 2.5V metrology ADC, and 1.8V communication IC in utility-grade meter. IC Role / Device Role / Timing Role: VCC1 monitors main 3.3V rail, VCC2 tracks 1.8V comms rail, RSTIN watches 2.5V ADC reference using precision divider. Use Value: Eliminates need for three separate supervisors; single 6-pin SOT23 reduces board area by >40% vs. discrete solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356TWUT-T | Push-pull RST1 output referenced to VCC1 (vs. open-drain RST in MAX6355TWUT-T); identical thresholds and RSTIN specs | Requires no external pull-up; better suited for driving heavy capacitive loads directly | Select when interfacing to processors without internal pull-ups or when minimizing external components is critical |
| TPS3808G30DBVR | Dual-voltage supervisor only (no RSTIN); 3.0V VDD1 threshold, 2.93V VDD2 threshold; 350nA quiescent current | Lacks third-voltage monitoring capability; lower ICC but no RSTIN flexibility | Choose only if third-rail supervision is unnecessary and ultra-low power (<1µA) is prioritized over feature set |
Compared with MAX6356TWUT-T, MAX6355TWUT-T offers open-drain flexibility for mixed-voltage logic interfacing, while TPS3808G30DBVR trades RSTIN capability for sub-µA standby current - making MAX6355TWUT-T the sole option among these three that delivers verified triple-rail supervision in a production-ready 6-pin SOT23.
Availability
MAX6355TWUT-T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6355TWUT-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 precision analog and mixed-signal ICs for industrial, automotive, and computing applications, with emphasis on reliability, low power, and integration.
The MAX6351–MAX6360 family delivers multivoltage supervision for complex embedded systems, targeting applications where simultaneous monitoring of two or three supply rails is essential to prevent silent failures during power transitions.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6355TWUT-T?
The MAX6355TWUT-T has a factory-set VCC1 threshold of 3.08V (±0.08V over –40°C to +85°C) and a VCC2 threshold of 1.67V (±0.05V over temperature). These values are laser-trimmed during production and documented in the Voltage Threshold Levels table of the MAX6351–MAX6360 datasheet. The "TW" suffix explicitly denotes this threshold pair, and both values are guaranteed across the full operating range without external calibration.
Does the MAX6355TWUT-T include a watchdog timer function?
No, the MAX6355TWUT-T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants, which feature WDI pin and dual-mode timeout periods (46.4s startup / 2.9s normal). The MAX6355TWUT-T pinout shows RSTIN at Pin 5 - not WDI - and its Selector Guide entry confirms absence of watchdog capability. This makes MAX6355TWUT-T appropriate for systems requiring triple-voltage supervision without watchdog overhead.
How is the third-voltage monitoring implemented on the MAX6355TWUT-T?
The MAX6355TWUT-T implements third-voltage monitoring via the RSTIN pin (Pin 5), which connects to an internal comparator with a fixed 1.22V threshold (±0.03V). To supervise a voltage higher than 1.22V - such as 2.5V or 5V - an external resistive divider scales the input to match the 1.22V reference. The MAX6355TWUT-T datasheet provides the exact formula: VEXT = 1.22V × (R1 + R2)/R2. RSTIN is powered by VCC1, so its input voltage must not exceed VCC1.
What is the output type of the reset signal on the MAX6355TWUT-T?
The MAX6355TWUT-T provides an active-low open-drain RST output at Pin 1. This requires an external pull-up resistor to the desired logic rail (e.g., 3.3V or 1.8V) and allows wired-OR connection with other reset sources. The output guarantees VOL ≤ 0.3V at ISINK = 50µA when VCC ≥ 1.2V, and remains valid as long as either VCC1 or VCC2 stays above 1.0V - a key differentiator from push-pull alternatives like MAX6356TWUT-T.
Is the MAX6355TWUT-T RoHS-compliant and what does the "-T" suffix indicate?
Yes, the MAX6355TWUT-T is RoHS-compliant. The "-T" suffix indicates tape-and-reel packaging in lead(Pb)-free format per JEDEC J-STD-020. Maxim specifies lead-free versions by replacing "-T" with "+T" only for legacy ordering - the standard -T version shipped since 2014 meets RoHS Directive 2011/65/EU and is compatible with standard reflow profiles. Full package details, including land pattern 90-0175, are published on maximintegrated.com/packages.
MAX6355TWUT-T 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:
- 3
- Voltage - Threshold:
- 1.67V, 3.08V, 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
MAX6355TWUT-T FAQ
1.How can I place an order for MAX6355TWUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6355TWUT-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 MAX6355TWUT-T reliable?
The price and inventory of MAX6355TWUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6355TWUT-T is usually 5 days.
3.What payment methods are accepted for MAX6355TWUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6355TWUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6355TWUT-T?
MAX6355TWUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6355TWUT-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 MAX6355TWUT-T?
For technical support, including MAX6355TWUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6355TWUT-T requirements.
6.How does Aetrix verify that MAX6355TWUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6355TWUT-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 MAX6355TWUT-T meets industry standards.
7.What is the process for return or replacement of MAX6355TWUT-T?
All MAX6355TWUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6355TWUT-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 MAX6355TWUT-T part is unused and in its original packaging.
Return procedure for MAX6355TWUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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