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Analog Devices Inc./Maxim Integrated MAX6357SWUT-T
- Part No.:
- MAX6357SWUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6357SWUT-T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6357SWUT-T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with active-low push-pull reset output referenced to VCC2, 2.93V VCC1 threshold, 1.67V VCC2 threshold, and integrated RSTIN input for monitoring a third voltage at 1.22V. It operates over –40°C to +85°C in a 6-pin SOT23 package and supports multivoltage embedded systems requiring precise power sequencing and fault detection.
For engineers reviewing the MAX6357SWUT-T datasheet, MAX6357SWUT-T pinout, MAX6357SWUT-T application, or MAX6357SWUT-T equivalent, key selection criteria include dual-supply reset assertion logic, guaranteed RESET validity down to VCC1/VCC2 = 1.0V, RSTIN comparator functionality, and compatibility with battery-backed or low-power industrial controllers.
Technical Context
The MAX6357SWUT-T monitors three supply rails: VCC1 (2.93V threshold), VCC2 (1.67V threshold), and an external voltage via RSTIN (1.22V fixed threshold). Reset is asserted if any monitored rail falls below its trip point, and the active-low RST2 output remains valid as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V.
It features a precision RSTIN input with ±0.03V threshold tolerance over temperature, 25nA input current, and 2.5mV hysteresis - enabling accurate third-rail monitoring using external resistive dividers. No watchdog timer or manual-reset debouncing circuitry is included in this variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.93V ±0.05V at +25°C; ensures reliable reset assertion when primary supply drops below nominal 2.93V rail |
| VCC2 Threshold | 1.67V ±0.05V at +25°C; enables supervision of low-voltage auxiliary rails such as 1.8V or 1.5V domains |
| RSTIN Threshold | 1.22V ±0.03V; provides fixed reference for third-voltage monitoring via external resistor divider |
| Supply Current | 20µA typical at VCC1=5.5V/VCC2=3.6V; supports ultra-low-power operation in battery-critical systems |
| Reset Timeout | 100ms minimum pulse width; meets JEDEC JESD78 requirements for processor reset hold time |
| Operating Temp | –40°C to +85°C; qualified for industrial-grade embedded control and instrumentation applications |
| Package | 6-pin SOT23; surface-mount footprint compatible with automated PCB assembly and space-constrained designs |
Pinout & Package
MAX6357SWUT-T is housed in a 6-pin SOT23 package with 0.95mm pitch, 2.9mm × 1.6mm body, and exposed pad option not applicable. Pin 1 is RST2 (active-low push-pull output referenced to VCC2), Pin 2 is GND, Pin 3 is MR (manual-reset input), Pin 4 is VCC2, Pin 5 is RSTIN (third-voltage monitor input), 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 VCC2 ≥ 2.7V; asserts during VCC1/VCC2/RSTIN undervoltage |
| 2 (GND) | Ground reference | Common return path for all internal comparators and output stages; must be low-impedance connection |
| 3 (MR) | Manual-reset input | TTL/CMOS-compatible active-low input; debounced internally; forces reset while asserted |
| 4 (VCC2) | Secondary supply input | Powers device when VCC2 > VCC1; monitored at 1.67V threshold; must remain ≤ VCC1 |
| 5 (RSTIN) | Third-voltage monitor input | High-impedance comparator input with 1.22V threshold; accepts external divider for voltages >1.22V |
| 6 (VCC1) | Primary supply input | Powers device when VCC1 > VCC2; monitored at 2.93V threshold; supplies bias for RSTIN circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneous monitoring of VCC1 (2.93V), VCC2 (1.67V), and external rail via RSTIN (1.22V) enables full-system power integrity verification |
| RSTIN comparator accuracy | ±0.03V threshold tolerance over –40°C to +85°C ensures stable third-rail detection without calibration |
| Low quiescent current | 20µA typical supply draw extends battery life in portable instrumentation and remote sensors |
| Reset validity to 1.0V | Guaranteed RST2 output state integrity down to VCC1 = 1.0V or VCC2 = 1.0V supports brownout-safe system shutdown |
| SOT23-6 footprint | Industry-standard 6-pin SOT23 package allows drop-in replacement in existing supervisory layouts without redesign |
Applications
| Industrial PLC I/O Modules | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Monitoring 3.3V CPU core, 1.8V FPGA I/O, and 3.0V sensor interface rails in programmable logic controller modules. IC Role / Device Role / Timing Role: MAX6357SWUT-T acts as centralized voltage supervisor asserting RST2 to halt CPU/FPGA execution upon any rail collapse. Use Value: Prevents corrupted I/O register writes and firmware crashes during transient supply dips in factory-floor environments. | Use Scenario: Supervising 2.93V microcontroller supply, 1.67V real-time clock backup rail, and 3.3V SD card interface in environmental data recorders. IC Role / Device Role / Timing Role: MAX6357SWUT-T provides coordinated reset signaling across all subsystems using single RST2 output referenced to VCC2. Use Value: Ensures atomic write completion and nonvolatile memory consistency during battery voltage sag or cold-temperature operation. |
| Medical Diagnostic Handhelds | Automotive Body Control Units |
Use Scenario: Validating 2.93V ARM Cortex-M supply, 1.67V analog front-end bias, and 2.5V ADC reference in portable ultrasound devices. IC Role / Device Role / Timing Role: MAX6357SWUT-T serves as safety-critical power monitor triggering controlled shutdown before analog signal corruption occurs. Use Value: Meets IEC 62304 Class B software safety requirements by guaranteeing deterministic reset behavior under supply faults. | Use Scenario: Supervising 2.93V infotainment SoC supply, 1.67V CAN transceiver VIO, and 5.0V sensor bus in vehicle door modules. IC Role / Device Role / Timing Role: MAX6357SWUT-T delivers synchronized reset to SoC and peripheral ICs via RST2, referenced to the 1.67V domain. Use Value: Eliminates startup race conditions between microcontroller and CAN PHY during cold-cranking events. |
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 | Same thresholds (2.93V/1.67V) but RST1 output referenced to VCC1 instead of RST2 referenced to VCC2 | Requires reset load referenced to primary supply rail rather than secondary; incompatible with VCC2-referenced reset sinks | Select MAX6356SWUT-T only if system reset logic ties to VCC1 domain and RSTIN functionality is retained |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); no RSTIN input or dual-threshold capability | Lacks third-voltage monitoring and cannot replace MAX6357SWUT-T in triple-rail systems without additional components | Use TPS3808G33DBVR only for simplified 3.3V-only applications where RSTIN and VCC2 supervision are unnecessary |
Compared with MAX6357SWUT-T, MAX6356SWUT-T offers identical voltage thresholds but shifts reset assertion to the VCC1 domain, while TPS3808G33DBVR reduces complexity at the cost of losing triple-rail supervision - making MAX6357SWUT-T uniquely suited for compact multivoltage systems requiring VCC2-referenced reset coordination.
Availability
MAX6357SWUT-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered data loggers, medical diagnostic handhelds, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6357SWUT-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 high-performance analog and mixed-signal semiconductor solutions for industrial, communications, and consumer markets.
The MAX6351–MAX6360 family delivers precision multivoltage supervision for embedded systems where simultaneous monitoring of multiple power domains is essential to system reliability and fail-safe operation.
FAQ
What is the function of the RSTIN pin on the MAX6357SWUT-T?
The RSTIN pin on the MAX6357SWUT-T is a high-impedance input that monitors a third voltage rail using an internal 1.22V comparator. When the applied voltage falls below 1.22V (±0.03V), it triggers the RST2 output. External resistive dividers allow scaling higher voltages into the detectable range. This feature is fully retained in MAX6357SWUT-T and requires no additional components for basic operation.
Does the MAX6357SWUT-T include a watchdog timer?
No, the MAX6357SWUT-T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6357SWUT-T is specifically configured for triple-voltage supervision with RSTIN input and VCC2-referenced RST2 output, omitting WDI circuitry entirely.
What are the exact voltage thresholds for MAX6357SWUT-T?
The MAX6357SWUT-T has a VCC1 threshold of 2.93V (±0.05V over temperature) and a VCC2 threshold of 1.67V (±0.05V over temperature). These values are factory-trimmed and guaranteed across –40°C to +85°C. The RSTIN threshold is fixed at 1.22V (±0.03V), independent of supply variations.
Can MAX6357SWUT-T operate with VCC1 and VCC2 supplied from different sources?
Yes, MAX6357SWUT-T supports independent VCC1 and VCC2 supplies, provided VCC1 ≥ VCC2 and both remain within 1.2V to 5.5V. The device powers from whichever supply is higher and monitors each rail against its dedicated threshold. This architecture enables flexible power sequencing in systems with asymmetric supply topologies.
Is the RST2 output of MAX6357SWUT-T push-pull or open-drain?
The RST2 output of MAX6357SWUT-T is an active-low push-pull driver referenced to VCC2. It can sink up to 1.2mA at VCC2 ≥ 2.7V and maintains valid logic levels down to VCC2 = 1.0V. This differs from open-drain variants like MAX6355 and eliminates the need for external pull-up resistors in most microcontroller interface configurations.
MAX6357SWUT-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, 2.93V, 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-23-6
MAX6357SWUT-T FAQ
1.How can I place an order for MAX6357SWUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6357SWUT-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 MAX6357SWUT-T reliable?
The price and inventory of MAX6357SWUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6357SWUT-T is usually 5 days.
3.What payment methods are accepted for MAX6357SWUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6357SWUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6357SWUT-T?
MAX6357SWUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6357SWUT-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 MAX6357SWUT-T?
For technical support, including MAX6357SWUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6357SWUT-T requirements.
6.How does Aetrix verify that MAX6357SWUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6357SWUT-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 MAX6357SWUT-T meets industry standards.
7.What is the process for return or replacement of MAX6357SWUT-T?
All MAX6357SWUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6357SWUT-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 MAX6357SWUT-T part is unused and in its original packaging.
Return procedure for MAX6357SWUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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