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Analog Devices Inc./Maxim Integrated MAX6358TWUT+T
- Part No.:
- MAX6358TWUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6358TWUT+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,675
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Product details
Overview
The MAX6358TWUT+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low open-drain reset output, 3.08V VCC1 threshold, 1.67V VCC2 threshold, 46.4s watchdog startup timeout, and 2.9s normal watchdog timeout-designed for reliable power monitoring in multivoltage embedded systems such as industrial controllers and portable instrumentation.
For engineers reviewing the MAX6358TWUT+T datasheet, MAX6358TWUT+T pinout, MAX6358TWUT+T application, or MAX6358TWUT+T equivalent, key selection criteria include dual-supply reset assertion behavior, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, watchdog timer architecture, SOT23-6 package compatibility, and lead-free RoHS-compliant ordering suffix "+T".
Technical Context
The MAX6358TWUT+T implements a dual-mode watchdog timer with distinct 46.4s startup timeout (for system initialization) and 2.9s normal timeout (for runtime fault detection), triggered by missing edges on the WDI input. It asserts reset if either VCC1 drops below 3.08V or VCC2 drops below 1.67V, with hysteresis and ±0.05V threshold tolerance over temperature.
Its open-drain RST output supports flexible pull-up configurations and remains valid as long as at least one supply exceeds +1.0V. The device operates across -40°C to +85°C with 20µA typical supply current and includes debounced TTL/CMOS-compatible manual-reset input (MR) referenced to VCC1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.08V ±0.05V at +25°C; ensures precise reset assertion when primary supply falls below nominal 3.3V rail |
| VCC2 Threshold | 1.67V ±0.05V at +25°C; enables accurate monitoring of low-voltage auxiliary rails like 1.8V or 1.6V logic |
| Watchdog Startup Timeout | 46.4s; provides extended initialization window before watchdog enforcement begins |
| Watchdog Normal Timeout | 2.9s; delivers rapid fault response during steady-state operation |
| Supply Current | 20µA typical; minimizes quiescent power draw in battery-powered or energy-sensitive systems |
| Reset Pulse Width | 100ms minimum; guarantees sufficient duration for microprocessor reset synchronization |
| Operating Temperature | -40°C to +85°C; supports deployment in industrial and automotive-adjacent environments |
Pinout & Package
MAX6358TWUT+T is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with 1.27mm pitch, 2.9mm × 1.6mm footprint, and RoHS-compliant lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low open-drain reset output | Requires external pull-up; asserts low when VCC1 < 3.08V or VCC2 < 1.67V; valid down to VCC = 1V |
| 2 - GND | Ground reference | Common return path for all internal circuits and external pull-ups |
| 3 - MR | Debounced manual-reset input | Pull low to force reset; internally pulled up; compatible with TTL/CMOS logic levels |
| 4 - VCC2 | Secondary supply input & monitor | Monitors 1.67V threshold; powers device when above VCC1; must not exceed +6V |
| 5 - WDI | Watchdog timer input | Edge-triggered; reset issued if no transition occurs within 2.9s (normal) or 46.4s (startup) |
| 6 - VCC1 | Primary supply input & monitor | Monitors 3.08V threshold; powers device when above VCC2; must not exceed +6V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply reset assertion | Guarantees reset if either VCC1 < 3.08V or VCC2 < 1.67V-enables robust fault coverage in split-rail systems |
| Two-phase watchdog timer | 46.4s startup + 2.9s normal timeout eliminates false resets during boot while ensuring fast runtime failure detection |
| Low-power operation | 20µA supply current allows integration into always-on or battery-backed subsystems without significant drain |
| Extended supply validity | RESET remains functional down to VCC1 = 1V or VCC2 = 1V-critical for brownout recovery in low-voltage systems |
| Transient-immune monitoring | Rejects short negative-going VCC transients per design; improves noise resilience in electrically noisy environments |
Applications
| Industrial Controllers | Portable Instrumentation |
|---|---|
Use Scenario: PLC I/O modules requiring coordinated reset across 3.3V logic and 1.6V sensor interface rails. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RST to synchronize microcontroller and peripheral reset sequencing. Use Value: Prevents partial initialization by guaranteeing reset until both supplies stabilize above 3.08V and 1.67V respectively. | Use Scenario: Handheld test equipment powered by single-cell Li-ion with regulated 3.3V and LDO-derived 1.6V rails. IC Role / Device Role / Timing Role: Power-good monitor and watchdog enforcer ensuring firmware integrity during battery voltage sag. Use Value: 46.4s startup timeout accommodates full boot sequence; 2.9s runtime timeout detects processor lockup before data corruption. |
| Intelligent Sensors | Multivoltage Embedded Systems |
Use Scenario: Smart environmental sensors combining ultra-low-power 1.6V analog front-end with 3.3V digital processing core. IC Role / Device Role / Timing Role: Independent voltage supervisor for each domain, with shared RST signal and MR override capability. Use Value: 20µA quiescent current preserves battery life; open-drain output interfaces cleanly with mixed-voltage reset trees. | Use Scenario: FPGA-based edge node with 3.3V configuration, 1.6V core, and watchdog-managed firmware execution. IC Role / Device Role / Timing Role: Centralized reset generator and watchdog controller coordinating power sequencing and runtime health checks. Use Value: Eliminates need for discrete comparators and RC timers; reduces BOM count and PCB area in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6359TWUT+T | Push-pull RST output referenced to VCC1 (vs. open-drain); identical thresholds and watchdog timing | Requires no external pull-up; incompatible with wired-OR reset buses | Select when driving single-load reset lines directly without pull-up resistors |
| TPS3808G30DBVR | Single-supply (3.0V threshold only); no VCC2 monitor or dual-mode watchdog; 200ms reset timeout | Lacks dual-rail monitoring and extended startup timeout-unsuitable for systems requiring independent 3.08V/1.67V validation | Choose only for simple 3.0V-only supervision where cost and footprint are prioritized over dual-rail capability |
Compared with MAX6359TWUT+T, the MAX6358TWUT+T offers open-drain flexibility for multi-drop reset buses but requires an external pull-up; versus TPS3808G30DBVR, it provides true dual-threshold monitoring and programmable watchdog phases essential for complex multivoltage boot sequences.
Availability
MAX6358TWUT+T is available at Aetrix Electronics and suitable for industrial controllers, portable instrumentation, intelligent sensors, and multivoltage embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6358TWUT+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 power management, sensing, and interface applications across industrial, computing, and communications markets.
The MAX6351–MAX6360 product line delivers integrated dual- and triple-voltage microprocessor supervisors with factory-trimmed thresholds, low quiescent current, and configurable watchdog functionality-targeting reliability-critical embedded systems with multiple power domains.
FAQ
What is the function of the WDI pin on the MAX6358TWUT+T?
The WDI (Watchdog Input) pin on the MAX6358TWUT+T monitors microprocessor activity via rising/falling edges. If no edge occurs within 46.4s after power-up (startup mode) or 2.9s during normal operation, the MAX6358TWUT+T asserts its open-drain RST output. This prevents silent firmware hangs by enforcing periodic software "kick" signals. The MAX6358TWUT+T's WDI input is internally serviced if left unconnected, disabling the watchdog function.
Does the MAX6358TWUT+T support operation with supply voltages below 2.0V?
Yes-the MAX6358TWUT+T guarantees functional reset assertion and valid RST output down to VCC1 = 1.0V or VCC2 = 1.0V, per its absolute maximum ratings and electrical characteristics. Its 1.67V VCC2 threshold and 3.08V VCC1 threshold remain accurate across the full -40°C to +85°C range, enabling use in brownout-prone or ultra-low-voltage systems where other supervisors fail. The MAX6358TWUT+T maintains this specification even at minimum operating temperature.
How does the MAX6358TWUT+T differ from the MAX6358TWUT-T?
The MAX6358TWUT+T is the lead-free, RoHS-compliant version of the MAX6358TWUT-T. Both share identical electrical specifications, pinout, package (SOT23-6), and functionality. The "+T" suffix indicates matte-tin lead finish and compliance with EU RoHS Directive 2011/65/EU, whereas "-T" denotes standard leaded packaging. No performance or thermal differences exist between the two variants-the choice depends solely on regulatory and assembly requirements.
Can the MAX6358TWUT+T monitor three voltage rails?
No-the MAX6358TWUT+T monitors exactly two supply rails: VCC1 (3.08V threshold) and VCC2 (1.67V threshold). It lacks the RSTIN input found on MAX6355/MAX6356/MAX6357 variants, which enables third-rail monitoring via an external resistive divider. For triple-voltage supervision, engineers must select MAX6356TWUT+T (same thresholds, push-pull RST, RSTIN input) or MAX6357TWUT+T (same thresholds, VCC2-referenced RST, RSTIN input). The MAX6358TWUT+T is strictly dual-rail.
What is the minimum pulse width required on the MR pin to trigger reset on the MAX6358TWUT+T?
The MAX6358TWUT+T requires a minimum MR (Manual Reset) pulse width of 1µs to reliably assert reset, as specified in its Electrical Characteristics table. The MR input is debounced and TTL/CMOS-compatible, with internal pull-up resistance of 32kΩ to 100kΩ. Pulses shorter than 1µs may be rejected due to internal glitch filtering; longer pulses maintain reset assertion until MR returns high and the reset timeout period (100ms min) completes. This specification applies across the full -40°C to +85°C operating range.
MAX6358TWUT+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:
- 2
- Voltage - Threshold:
- 1.67V, 3.08V
- 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
MAX6358TWUT+T FAQ
1.How can I place an order for MAX6358TWUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6358TWUT+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 MAX6358TWUT+T reliable?
The price and inventory of MAX6358TWUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6358TWUT+T is usually 5 days.
3.What payment methods are accepted for MAX6358TWUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6358TWUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6358TWUT+T?
MAX6358TWUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6358TWUT+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 MAX6358TWUT+T?
For technical support, including MAX6358TWUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6358TWUT+T requirements.
6.How does Aetrix verify that MAX6358TWUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6358TWUT+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 MAX6358TWUT+T meets industry standards.
7.What is the process for return or replacement of MAX6358TWUT+T?
All MAX6358TWUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6358TWUT+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 MAX6358TWUT+T part is unused and in its original packaging.
Return procedure for MAX6358TWUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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