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Analog Devices Inc./Maxim Integrated MAX6357TZUT+T
- Part No.:
- MAX6357TZUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6357TZUT+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,912
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Product details
Overview
MAX6357TZUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with active-low push-pull reset output referenced to VCC2, factory-set VCC1 threshold of 3.08V and VCC2 threshold of 2.32V, 100ms minimum reset timeout, and support for third-voltage monitoring via RSTIN input (1.22V threshold). It ensures system reliability in multivoltage embedded controllers.
For engineers reviewing the MAX6357TZUT+T datasheet, MAX6357TZUT+T pinout, MAX6357TZUT+T application, or MAX6357TZUT+T equivalent, key selection factors include dual-supply monitoring with independent thresholds, guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, 20µA supply current, and compatibility with manual reset and third-voltage supervision.
Technical Context
The MAX6357TZUT+T monitors three voltage rails: VCC1 (3.08V threshold), VCC2 (2.32V threshold), and an external rail via RSTIN (1.22V comparator input). Reset assertion occurs if any monitored voltage falls below its trip point, and the active-low RST2 output remains valid as long as either VCC1 or VCC2 exceeds +1.0V.
It implements precision factory-trimmed thresholds with ±0.05V typical accuracy over -40°C to +85°C, 20ppm/°C tempco, and includes debounced TTL/CMOS-compatible manual reset (MR) with sub-microsecond response. No watchdog timer is present-this variant belongs to the MAX6355/MAX6356/MAX6357 group without WDI functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.08V ±0.05V at +25°C; guarantees reliable reset assertion when primary supply drops below nominal 3.3V rail |
| VCC2 Threshold | 2.32V ±0.05V at +25°C; enables precise supervision of secondary 2.5V or 2.3V logic rails |
| RSTIN Threshold | 1.22V ±0.03V; allows accurate third-rail monitoring (e.g., 1.2V core) using external resistive divider |
| Reset Timeout | 100ms minimum; ensures μP receives sufficiently long reset pulse for full initialization |
| Supply Current | 20µA typical; supports ultra-low-power battery-backed or energy-constrained systems |
| Operating Temp | -40°C to +85°C; qualified for industrial-grade embedded applications without derating |
| RESET Validity | Guaranteed while VCC1 ≥ 1.0V or VCC2 ≥ 1.0V; maintains reset integrity during brownout conditions |
Pinout & Package
MAX6357TZUT+T is housed in a lead(Pb)-free 6-pin SOT23 package (U6-1 outline), with 1.27mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted. Pin 1 is RST2 (active-low push-pull output referenced to VCC2), Pin 2 is GND, Pin 3 is MR, Pin 4 is VCC2, Pin 5 is RSTIN, and Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST2) | Active-low reset output | Push-pull driver referenced to VCC2; sinks 1.2mA at ≤0.3V, no external pullup required |
| 2 (GND) | Ground reference | Common return path for all internal comparators and logic; must be low-impedance |
| 3 (MR) | Manual reset input | Debounced active-low control; forces reset when pulled <0.8V (VCC1 > VTH1); glitch rejection ≥100ns |
| 4 (VCC2) | Secondary supply input | Powers device when VCC2 > VCC1; monitored at 2.32V threshold; absolute max = +6V |
| 5 (RSTIN) | Third-voltage monitor input | High-impedance comparator input (±25nA bias); asserts reset when voltage <1.22V; referenced to VCC1 |
| 6 (VCC1) | Primary supply input | Powers device when VCC1 > VCC2; monitored at 3.08V threshold; absolute max = +6V |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC1 (3.08V), VCC2 (2.32V), and external rail via RSTIN (1.22V), eliminating need for discrete supervisors |
| Factory-trimmed thresholds | ±0.05V accuracy over temperature avoids external calibration and reduces BOM count |
| Low quiescent current | 20µA typical enables >10-year battery life in portable equipment with periodic wake-up |
| VCC transient immunity | Rejects transients <100µs at 100mV overdrive, preventing false resets in noisy power environments |
| Reset validity to 1.0V | Ensures deterministic reset behavior during deep brownouts where VCC drops near cutoff |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Supervising dual-core ARM-based controller with 3.3V I/O, 2.5V memory, and 1.2V CPU core. IC Role / Device Role / Timing Role: Triple-rail supervisor asserting RST2 on VCC2 fault, RSTIN on core voltage droop, and coordinating reset timing across domains. Use Value: Prevents partial initialization and state corruption by guaranteeing synchronized reset across all voltage domains before firmware execution. | Use Scenario: Battery-powered ultrasound probe requiring fail-safe boot under variable Li-ion discharge (3.0–4.2V) and regulated 2.3V analog front-end. IC Role / Device Role / Timing Role: Monitors main rail (3.08V), analog rail (2.32V), and critical 1.2V ADC reference via RSTIN to trigger safe shutdown. Use Value: Enables deterministic power-fail response within 100ms, preserving patient data and preventing sensor damage during abrupt power loss. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Monitoring 3.3V microcontroller supply, 2.3V CAN transceiver rail, and 1.2V real-time clock backup in under-hood ECUs. IC Role / Device Role / Timing Role: Provides single-chip supervision with VCC1/VCC2/RSTIN inputs and failsafe RST2 output tied to MCU reset pin. Use Value: Reduces component count vs. dual-supervisor solution while maintaining AEC-Q100-relevant robustness (transient immunity, -40°C to +85°C). | Use Scenario: Supervising isolated 3.3V metrology SoC, 2.3V RTC/sensor rail, and 1.2V precision reference in DIN-rail mounted meters. IC Role / Device Role / Timing Role: Ensures clean reset initiation during AC line dropout or battery switchover using RST2 and RSTIN-triggered latching. Use Value: Guarantees meter firmware restarts only after all rails stabilize, preventing corrupted kWh accumulation or EEPROM writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356TZUT+T | Same package and thresholds, but RST1 output referenced to VCC1 instead of RST2 referenced to VCC2 | Requires reset signal referenced to primary supply (VCC1), not secondary (VCC2); incompatible with VCC2-synchronous reset designs | Select MAX6356TZUT+T only if MCU reset pin must be driven from VCC1 domain |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), no RSTIN input or dual-threshold capability; 35µA supply current | Lacks third-rail monitoring and VCC2 supervision; requires additional ICs for multivoltage systems | Use only in single-rail applications where cost and size outweigh need for integrated triple supervision |
Compared with MAX6356TZUT+T, MAX6357TZUT+T provides reset assertion referenced to VCC2-critical when the controlled subsystem operates from the secondary rail. Against TPS3808G33DBVR, it delivers true triple-rail integration, reducing board area and interconnect complexity in multivoltage designs.
Availability
MAX6357TZUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, smart energy meters, and multivoltage embedded systems requiring stable component supply across extended temperature ranges.
Supply support for MAX6357TZUT+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 integrated multivoltage supervision for space-constrained embedded systems, targeting applications where reliability, low power, and precise threshold accuracy are essential.
FAQ
What is the function of the RSTIN pin on the MAX6357TZUT+T?
The RSTIN pin on the MAX6357TZUT+T is a high-impedance input that monitors a third voltage rail using an internal 1.22V comparator. When the voltage at RSTIN falls below 1.22V, the device asserts the RST2 output. The input must remain ≤ VCC1, and external resistive dividers enable supervision of voltages above 1.22V. This feature is confirmed in the MAX6357-specific pin description and electrical characteristics table.
Does the MAX6357TZUT+T include a watchdog timer?
No, the MAX6357TZUT+T does not include a watchdog timer. It belongs to the MAX6355/MAX6356/MAX6357 subgroup, which adds RSTIN-based third-voltage monitoring but omits the WDI input and associated watchdog functionality. Watchdog capability is exclusive to MAX6358/MAX6359/MAX6360 variants, as clearly differentiated in the Selector Guide and Pin Configurations section.
What are the absolute maximum ratings for VCC1 and VCC2 on the MAX6357TZUT+T?
The absolute maximum rating for both VCC1 and VCC2 on the MAX6357TZUT+T is -0.3V to +6V relative to GND. This rating is explicitly stated in the Absolute Maximum Ratings table and applies across the full operating temperature range. Exceeding +6V may cause permanent damage, and operation below -0.3V is not permitted.
How does the MAX6357TZUT+T ensure reset validity during brownout conditions?
The MAX6357TZUT+T guarantees RESET output validity as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, per the Electrical Characteristics table and General Description. This design ensures deterministic reset behavior even during deep brownouts where one supply collapses below normal operating range, preventing spurious release of reset before system stabilization.
Is the MAX6357TZUT+T pin-compatible with other devices in the MAX6351–MAX6360 family?
Yes, the MAX6357TZUT+T shares the same 6-pin SOT23 (U6-1) package and pinout as all 6-pin variants in the MAX6351–MAX6360 family, including MAX6351, MAX6355, MAX6356, MAX6358–MAX6360. Pin 1 is RST2, Pin 2 is GND, Pin 3 is MR, Pin 4 is VCC2, Pin 5 is RSTIN, and Pin 6 is VCC1-confirmed in the Pin Configurations diagram and Pin Description table.
MAX6357TZUT+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:
- 2.32V, 3.08V, 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
MAX6357TZUT+T FAQ
1.How can I place an order for MAX6357TZUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6357TZUT+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 MAX6357TZUT+T reliable?
The price and inventory of MAX6357TZUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6357TZUT+T is usually 5 days.
3.What payment methods are accepted for MAX6357TZUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6357TZUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6357TZUT+T?
MAX6357TZUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6357TZUT+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 MAX6357TZUT+T?
For technical support, including MAX6357TZUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6357TZUT+T requirements.
6.How does Aetrix verify that MAX6357TZUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6357TZUT+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 MAX6357TZUT+T meets industry standards.
7.What is the process for return or replacement of MAX6357TZUT+T?
All MAX6357TZUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6357TZUT+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 MAX6357TZUT+T part is unused and in its original packaging.
Return procedure for MAX6357TZUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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