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Analog Devices Inc./Maxim Integrated MAX6355SYUT+T
- Part No.:
- MAX6355SYUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6355SYUT+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6355SYUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with open-drain active-low reset output, 2.93V VCC1 threshold, 2.19V VCC2 threshold, and adjustable third-voltage monitoring input (RSTIN) with 1.22V internal reference. It operates over -40°C to +85°C in 6-pin SOT23 and ensures system reliability in multivoltage embedded controllers.
For engineers reviewing the MAX6355SYUT+T datasheet, MAX6355SYUT+T pinout, MAX6355SYUT+T application, or MAX6355SYUT+T equivalent, key selection criteria include dual-supply reset assertion logic, RSTIN-based third-voltage monitoring capability, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, and compatibility with manual-reset and power-fail detection requirements in space-constrained designs.
Technical Context
The MAX6355SYUT+T implements independent voltage monitoring for three rails: VCC1 (2.93V threshold), VCC2 (2.19V threshold), and an external rail via RSTIN with factory-trimmed 1.22V comparator reference. Reset assertion occurs if any monitored supply falls below its threshold, and the open-drain RST output remains valid as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V.
It features debounced TTL/CMOS-compatible manual-reset input (MR), 20µA quiescent current, 100ms minimum power-on-reset pulse width, and supports resistive-divider configuration for RSTIN to monitor voltages above 1.22V. No watchdog timer or push-pull output is present - distinguishing it from MAX6358/MAX6359/MAX6360 and MAX6356/MAX6357 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.93V ±0.05V at +25°C; guarantees reset assertion when primary supply drops below nominal 2.93V rail |
| VCC2 Threshold | 2.19V ±0.03V at +25°C; enables precise monitoring of secondary 2.19V supply (e.g., I/O or analog domain) |
| RSTIN Reference | 1.22V ±0.03V internal comparator threshold; allows third-rail monitoring via external resistor divider |
| Supply Current | 20µA typical at VCC1=5.5V/VCC2=3.6V; enables ultra-low-power operation in battery-backed systems |
| Reset Pulse Width | 100ms minimum timeout; ensures sufficient duration for microprocessor initialization and state recovery |
| Operating Temp | -40°C to +85°C extended range; qualified for industrial and automotive-adjacent embedded applications |
| Package | 6-pin SOT23 (U6-1); surface-mount footprint compatible with automated assembly and high-density PCB layouts |
Pinout & Package
MAX6355SYUT+T uses a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), RoHS-compliant with lead(Pb)-free finish indicated by "+T" suffix. Pin 1 is RST (open-drain active-low reset), Pin 2 is GND, Pin 3 is MR (manual-reset input), Pin 4 is VCC2, Pin 5 is RSTIN (adjustable third-voltage monitor input), and Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Open-drain active-low reset output | Requires external pull-up; asserts low during fault or manual reset; compatible with mixed-voltage µP reset inputs |
| 2 - GND | Ground reference | Common return path for all internal comparators and logic; must be low-impedance to ensure threshold accuracy |
| 3 - MR | Debounced manual-reset input | Pull low to force reset; internally debounced; valid for VCC1 > VTH1(MAX); no external RC needed |
| 4 - VCC2 | Secondary supply input & monitor rail | Supplies internal circuitry when VCC2 > VCC1; monitored at 2.19V threshold; powers RSTIN comparator |
| 5 - RSTIN | Adjustable third-voltage monitor input | Accepts external voltage via resistor divider; triggers reset when input falls below 1.22V reference |
| 6 - VCC1 | Primary supply input & monitor rail | Supplies internal circuitry when VCC1 > VCC2; monitored at 2.93V threshold; powers MR and RSTIN circuits |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Monitors VCC1 (2.93V), VCC2 (2.19V), and third rail via RSTIN - eliminates need for discrete comparators in 3-rail systems |
| Open-drain RST output | Enables wired-OR reset bus sharing across multiple supervisors or µPs without contention |
| RSTIN with 1.22V reference | Allows precise monitoring of any rail ≥1.22V using two external resistors - supports custom thresholds without trimming |
| Guaranteed RESET down to 1V | Ensures valid reset signal even during brownout conditions where VCC1 or VCC2 drops to 1.0V |
| 20µA supply current | Reduces standby power in always-on subsystems - critical for portable and energy-harvesting applications |
Applications
| Industrial PLC Controllers | Battery-Powered IoT Sensors |
|---|---|
|
Use Scenario: Monitoring 3.3V CPU core, 2.2V I/O bank, and 1.8V sensor interface rail in programmable logic controller modules. IC Role / Device Role / Timing Role: Triple-rail supervisor asserting unified open-drain RST signal upon any rail undervoltage event; RSTIN configured for 1.8V rail via 100kΩ/120kΩ divider. Use Value: Prevents erratic firmware execution during partial power loss; eliminates need for three separate supervisors and reduces BOM count by 67%. |
Use Scenario: Ensuring clean boot and safe shutdown in LoRaWAN end-nodes powered by single-cell Li-ion (3.0–4.2V) with regulated 2.2V MCU and 1.8V radio rails. IC Role / Device Role / Timing Role: Supervises main regulator output (VCC1 = 2.93V), LDO output (VCC2 = 2.19V), and battery voltage (via RSTIN) to trigger graceful sleep before cutoff. Use Value: Extends usable battery capacity by enabling early warning of depletion; 20µA quiescent current minimizes self-discharge during deep sleep. |
| Multivoltage Medical Instrumentation | Automotive Body Control Modules |
|
Use Scenario: Validating power integrity across isolated 3.3V digital, 2.2V ADC reference, and 1.2V FPGA configuration rails in portable ultrasound processors. IC Role / Device Role / Timing Role: Provides synchronized reset assertion across domains; RSTIN monitors FPGA VCCINT via 1.22V reference to detect configuration corruption risk. Use Value: Meets IEC 62304 Class C software safety requirements by guaranteeing deterministic reset behavior under all single-point faults. |
Use Scenario: Supervising 3.3V infotainment SoC, 2.2V CAN transceiver, and 1.2V sensor hub supply in 12V automotive body control unit with wide-input DC-DC converters. IC Role / Device Role / Timing Role: Detects undervoltage on each rail independently; open-drain RST interfaces directly to SoC's bidirectional reset pin via 4.7kΩ series resistor. Use Value: Eliminates risk of latch-up during cold-crank (4.5V battery dip) by maintaining valid RST until VCC1 or VCC2 falls below 1.0V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356SYUT+T | Push-pull RST output referenced to VCC1; identical VCC1/VCC2 thresholds and RSTIN functionality | Requires no external pull-up; incompatible with wired-OR reset buses | Select when driving single µP reset pin directly and board space permits slightly higher drive strength |
| TPS3808G33DBVR | Dual-voltage supervisor only (no RSTIN); 3.3V/2.5V fixed thresholds; 1.8µA IQ; SOT23-6 | Lacks third-rail monitoring; lower quiescent current but limited voltage flexibility | Select for cost-sensitive dual-rail systems where third-rail monitoring is handled separately |
Compared with MAX6355SYUT+T, MAX6356SYUT+T offers stronger reset drive but forfeits bus-sharing capability, while TPS3808G33DBVR reduces power consumption by 91% yet requires external circuitry for third-rail supervision - making MAX6355SYUT+T optimal for integrated triple-rail integrity assurance.
Availability
MAX6355SYUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered IoT sensors, multivoltage medical instrumentation, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6355SYUT+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, communications, computing, and consumer applications.
The MAX6351–MAX6360 family delivers multivoltage supervision with factory-trimmed thresholds and flexible reset architectures - engineered specifically for reliability-critical embedded systems where power-rail integrity directly impacts functional safety.
FAQ
What is the function of the RSTIN pin on the MAX6355SYUT+T?
The RSTIN pin on the MAX6355SYUT+T is an adjustable third-voltage monitor input with a factory-trimmed 1.22V internal reference comparator. When an external voltage - scaled via a resistor divider - falls below this threshold, the device asserts the open-drain RST output. This enables monitoring of a third supply rail beyond VCC1 and VCC2 without additional components, and the pin must be tied to VCC1 if unused. The MAX6355SYUT+T datasheet specifies RSTIN input current as ±25nA and hysteresis as 2.5mV.
Does the MAX6355SYUT+T include a watchdog timer?
No, the MAX6355SYUT+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6355SYUT+T provides triple-voltage supervision (VCC1, VCC2, and RSTIN) with manual reset and power-on reset only. Its pinout omits the WDI terminal, and the device description explicitly excludes watchdog features - confirming that MAX6355SYUT+T is intended for systems where processor activity monitoring is handled externally or not required.
What are the exact voltage thresholds for VCC1 and VCC2 on the MAX6355SYUT+T?
The MAX6355SYUT+T has a VCC1 threshold of 2.93V (±0.05V at +25°C, ±0.08V over -40°C to +85°C) and a VCC2 threshold of 2.19V (±0.03V at +25°C, ±0.06V over temperature). These values are confirmed by the "Voltage Threshold Levels" table in the MAX6351–MAX6360 datasheet, where the "SY" suffix maps to VCC1 = 2.93V and VCC2 = 2.19V. Both thresholds are factory-trimmed and fully guaranteed over the extended temperature range.
Can the MAX6355SYUT+T operate with supply voltages below 2.19V?
Yes - the MAX6355SYUT+T guarantees valid reset operation as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, per Absolute Maximum Ratings and Electrical Characteristics. While its VCC2 threshold is 2.19V, the device continues to monitor and assert RST down to 1.0V on either supply. However, VCC1 and VCC2 must remain within 1.2V to 5.5V for full specification compliance; operation below 1.2V is functional but outside guaranteed parametric limits.
Is the MAX6355SYUT+T pin-compatible with other devices in the MAX6351–MAX6360 family?
The MAX6355SYUT+T shares the same 6-pin SOT23 (U6-1) package and pinout with MAX6356SYUT+T, MAX6357SYUT+T, MAX6358SYUT+T, MAX6359SYUT+T, and MAX6360SYUT+T - all have RST/RSTIN/WDI on Pin 1, GND on Pin 2, MR on Pin 3, VCC2 on Pin 4, and VCC1 on Pin 6. However, Pin 5 differs: MAX6355SYUT+T uses RSTIN, while MAX6358–MAX6360 use WDI and MAX6356/MAX6357 use RST1/RST2. Thus, direct replacement requires verifying Pin 5 function match in the target design.
MAX6355SYUT+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:
- 2.19V, 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
MAX6355SYUT+T FAQ
1.How can I place an order for MAX6355SYUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6355SYUT+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 MAX6355SYUT+T reliable?
The price and inventory of MAX6355SYUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6355SYUT+T is usually 5 days.
3.What payment methods are accepted for MAX6355SYUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6355SYUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6355SYUT+T?
MAX6355SYUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6355SYUT+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 MAX6355SYUT+T?
For technical support, including MAX6355SYUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6355SYUT+T requirements.
6.How does Aetrix verify that MAX6355SYUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6355SYUT+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 MAX6355SYUT+T meets industry standards.
7.What is the process for return or replacement of MAX6355SYUT+T?
All MAX6355SYUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6355SYUT+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 MAX6355SYUT+T part is unused and in its original packaging.
Return procedure for MAX6355SYUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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