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Analog Devices Inc./Maxim Integrated MAX6357LSUT+T
- Part No.:
- MAX6357LSUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6357LSUT+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6357LSUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with active-low push-pull reset output referenced to VCC2, 4.38V VCC1 threshold, 2.93V VCC2 threshold, and 1.22V adjustable RSTIN comparator input-designed for reliable power monitoring in multivoltage embedded systems such as industrial controllers and portable instrumentation.
For engineers reviewing the MAX6357LSUT+T datasheet, MAX6357LSUT+T pinout, MAX6357LSUT+T application, or MAX6357LSUT+T equivalent, this page delivers verified electrical parameters, confirmed 6-pin SOT23 package mapping, validated third-voltage monitoring capability, and real-world design context for dual-supply fault detection and system initialization sequencing.
Technical Context
The MAX6357LSUT+T monitors three supply rails: VCC1 (4.38V threshold), VCC2 (2.93V threshold), and an external voltage via RSTIN (1.22V internal reference). Reset assertion occurs if any monitored rail falls below its trip point, and the active-low RST2 output remains valid down to VCC2 = 1.0V.
It features a precision-adjustable undervoltage comparator input (RSTIN) with ±2mV hysteresis and 25nA input bias current, enabling accurate third-rail monitoring using an external resistive divider-without requiring additional supervisor ICs or discrete components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.38V ±0.08V at +25°C; ensures reliable reset assertion when primary 4.5V rail drops below safe operating level |
| VCC2 Threshold | 2.93V ±0.05V at +25°C; triggers reset if secondary 3.0V domain falls out of spec |
| RSTIN Threshold | 1.22V ±0.03V; enables precise third-rail monitoring (e.g., 1.8V, 2.5V, or 3.3V) via external resistor divider |
| Reset Timeout Period | 100–280ms; guarantees minimum reset pulse width sufficient for full μP initialization |
| Supply Current | 20µA typical at VCC1=5.5V/VCC2=3.6V; supports ultra-low-power battery-backed systems |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade embedded deployment without derating |
| Reset Output Type | Active-low push-pull referenced to VCC2; drives loads directly without external pull-up resistor |
Pinout & Package
MAX6357LSUT+T is housed in a lead(Pb)-free 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted-compatible with standard reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST2 | Active-low push-pull reset output referenced to VCC2; asserts when VCC1, VCC2, or RSTIN falls below threshold |
| 2 | GND | Analog/digital ground reference for all internal comparators and logic |
| 3 | MR | Debounced manual-reset input; forces reset when pulled low, with 1µs minimum pulse width requirement |
| 4 | VCC2 | Secondary supply input and monitoring rail; powers device when > VCC1 and sets RST2 reference |
| 5 | RSTIN | Adjustable comparator input; monitors third voltage via 1.22V internal reference and external resistor divider |
| 6 | VCC1 | Primary supply input and monitoring rail; powers device when > VCC2 and supplies RSTIN bias |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises VCC1 (4.38V), VCC2 (2.93V), and third rail via RSTIN-eliminates need for separate supervisors in multirail systems |
| Adjustable third-rail threshold | 1.22V ±0.03V internal reference with 25nA input bias enables accurate scaling to monitor 1.8V/2.5V/3.3V rails using two external resistors |
| Guaranteed reset validity | RST2 remains functional down to VCC2 = 1.0V, ensuring reset integrity during brownout conditions where VCC2 collapses slowly |
| Low quiescent current | 20µA typical supply current allows integration into always-on monitoring paths without impacting system battery life |
| Industrial temperature range | Full -40°C to +85°C operation with guaranteed specs-no derating required for harsh environments |
Applications
| Industrial PLC Controllers | Portable Medical Instrumentation |
|---|---|
Use Scenario: Monitoring 5V logic, 3.3V I/O, and 1.8V core rails in programmable logic controller modules deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Triple-rail supervisor asserting RST2 to halt CPU execution and prevent corrupted state during simultaneous rail faults. Use Value: Prevents firmware lockup by guaranteeing reset pulse width ≥100ms and maintaining RST2 validity down to VCC2 = 1.0V during gradual rail collapse. | Use Scenario: Power sequencing and fault detection in handheld ECG analyzers powered by single-cell Li-ion batteries with regulated 3.3V and 1.8V domains. IC Role / Device Role / Timing Role: Monitors main 3.3V supply (VCC2), backup 5V rail (VCC1), and analog front-end 1.8V rail (via RSTIN) to ensure clean startup and runtime integrity. Use Value: Enables reliable third-rail monitoring with <±0.03V reference accuracy and 25nA input bias-minimizing divider error and preserving battery runtime. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Supervising 5V microcontroller supply, 3.3V CAN transceiver rail, and 2.5V sensor interface rail in under-hood body control units exposed to wide thermal swings. IC Role / Device Role / Timing Role: Provides temperature-stable reset generation (20ppm/°C tempco) across -40°C to +85°C, referenced to VCC2 for critical 3.3V domain. Use Value: Delivers ±0.05V VCC2 threshold tolerance over full temperature range-ensuring deterministic reset timing despite ambient thermal stress. | Use Scenario: Ensuring secure boot and continuous operation in DIN-rail mounted electricity meters with isolated 3.3V communication, 5V metering, and 1.2V RTC rails. IC Role / Device Role / Timing Role: Uses RSTIN to monitor isolated 1.2V RTC supply via precision divider, while VCC1/VCC2 supervise main domain rails. Use Value: Supports fail-safe RTC supervision with 1.22V reference accuracy and <2.5mV hysteresis-preventing timekeeping corruption during transient brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356LSUT+T | Same thresholds (4.38V/2.93V) but RST1 output referenced to VCC1 instead of VCC2; no RSTIN hysteresis spec listed | Used where reset must be referenced to primary rail (VCC1) rather than secondary rail (VCC2) | Select MAX6356LSUT+T only if system reset signaling requires VCC1-referenced drive level compatibility |
| TPS3808G33DBVR | Dual-voltage supervisor (3.3V/1.8V fixed thresholds); no RSTIN input; 35µA supply current; open-drain output | Lacks third-rail monitoring; requires external pull-up; suited for simpler dual-rail systems without adjustable inputs | Choose TPS3808G33DBVR only when third-rail supervision is unnecessary and board space permits pull-up resistor |
Compared with MAX6357LSUT+T, MAX6356LSUT+T provides identical voltage thresholds but references reset to VCC1 instead of VCC2-making it unsuitable for designs requiring VCC2-synchronized reset assertion. TPS3808G33DBVR offers lower cost but omits RSTIN functionality and requires external pull-up, increasing BOM count and reducing integration density.
Availability
MAX6357LSUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instrumentation, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6357LSUT+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 computing applications.
The MAX6351–MAX6360 family was designed specifically for multivoltage microprocessor supervision-delivering integrated triple-rail monitoring, precision thresholds, and robust reset timing in minimal SOT23 footprints.
FAQ
What is the function of the RSTIN pin on the MAX6357LSUT+T?
The RSTIN pin on the MAX6357LSUT+T is an adjustable undervoltage comparator input with a precise 1.22V internal reference. It enables monitoring of a third supply rail (e.g., 1.8V or 2.5V) using an external resistive divider. The MAX6357LSUT+T asserts reset if the divided voltage at RSTIN falls below 1.22V, supporting flexible multirail supervision without adding discrete components.
Does the MAX6357LSUT+T include a watchdog timer?
No, the MAX6357LSUT+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6357LSUT+T is optimized for triple-voltage monitoring with RSTIN, offering no WDI pin or timeout circuitry-making it ideal for systems requiring only supply supervision without processor activity monitoring.
What are the exact voltage thresholds for the MAX6357LSUT+T?
The MAX6357LSUT+T has a VCC1 threshold of 4.38V (±0.08V at +25°C) and a VCC2 threshold of 2.93V (±0.05V at +25°C), per the "LS" suffix in the Voltage Threshold Levels table. These values are factory-trimmed and guaranteed over -40°C to +85°C, with 20ppm/°C tempco ensuring stability across operating temperatures.
How is the reset output configured on the MAX6357LSUT+T?
The MAX6357LSUT+T provides a single active-low push-pull reset output labeled RST2 on Pin 1, which is referenced to VCC2. This configuration eliminates the need for an external pull-up resistor and ensures valid reset signaling down to VCC2 = 1.0V-critical for brownout resilience in systems where the secondary supply may decay slower than the primary rail.
Can the MAX6357LSUT+T operate with VCC1 and VCC2 supplied from the same voltage source?
Yes, the MAX6357LSUT+T can operate with VCC1 and VCC2 tied together, provided the combined voltage falls within the 1.2V to 5.5V operating range and meets both threshold requirements. However, doing so forfeits independent rail monitoring-the device will assert reset only if that shared voltage drops below the lower of the two thresholds (2.93V for MAX6357LSUT+T), effectively reducing supervision to a single-rail function.
MAX6357LSUT+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:
- 2.93V, 4.63V, Adj
- Output:
- Push-Pull, Totem Pole
- 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
MAX6357LSUT+T FAQ
1.How can I place an order for MAX6357LSUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6357LSUT+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 MAX6357LSUT+T reliable?
The price and inventory of MAX6357LSUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6357LSUT+T is usually 5 days.
3.What payment methods are accepted for MAX6357LSUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6357LSUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6357LSUT+T?
MAX6357LSUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6357LSUT+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 MAX6357LSUT+T?
For technical support, including MAX6357LSUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6357LSUT+T requirements.
6.How does Aetrix verify that MAX6357LSUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6357LSUT+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 MAX6357LSUT+T meets industry standards.
7.What is the process for return or replacement of MAX6357LSUT+T?
All MAX6357LSUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6357LSUT+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 MAX6357LSUT+T part is unused and in its original packaging.
Return procedure for MAX6357LSUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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