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Analog Devices Inc./Maxim Integrated MAX6358LTUT
- Part No.:
- MAX6358LTUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6358LTUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,622
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Product details
Overview
MAX6358LTUT from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with open-drain active-low reset output, 4.63V/3.08V precision factory-set VCC1/VCC2 thresholds, watchdog timer (46.4s startup / 2.9s normal timeout), and guaranteed operation down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. It monitors two independent power rails in multivoltage embedded systems to prevent processor corruption during brownout.
For engineers reviewing the MAX6358LTUT datasheet, MAX6358LTUT pinout, MAX6358LTUT application, or MAX6358LTUT equivalent, key selection criteria include dual-supply threshold accuracy, watchdog timeout behavior, open-drain reset drive capability, and SOT23-6 package compatibility with space-constrained industrial controllers and portable equipment.
Technical Context
The MAX6358LTUT implements a dual-threshold comparator architecture monitoring VCC1 and VCC2 independently: reset asserts if either supply drops below its specified trip point (4.63V for VCC1, 3.08V for VCC2). Its watchdog timer features two distinct timeout modes-46.4s startup period for system initialization and 2.9s normal mode for runtime supervision-with WDI edge-triggered clearing.
Reset assertion is valid as long as at least one supply remains ≥1.0V, enabling reliable reset generation during asymmetric rail collapse. The open-drain RST output supports flexible pull-up configurations and bidirectional μP interface via external resistor buffering, per Figure 5 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.63V ±0.09V (25°C); ensures precise 4.63V brownout detection on primary supply rail |
| VCC2 Threshold | 3.08V ±0.05V (25°C); enables accurate 3.08V monitoring of secondary 3.3V-compatible rail |
| Watchdog Startup Timeout | 46.4s typical; provides extended boot window before watchdog enforcement begins |
| Watchdog Normal Timeout | 2.9s typical; delivers rapid fault response during steady-state processor operation |
| Supply Current | 20µA typical at 5.5V/3.6V; minimizes quiescent power in battery-backed systems |
| Reset Pulse Width | 100ms minimum; guarantees sufficient duration for μP reset synchronization |
| Operating Temperature | -40°C to +85°C; validated for industrial-grade environmental reliability |
Pinout & Package
MAX6358LTUT is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with 1.6mm × 2.9mm footprint and 0.95mm height, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-Low Open-Drain Reset Output | Asserts low during fault; requires external pull-up; compatible with bidirectional μP reset pins via 4.7kΩ series resistor |
| 2 - GND | Ground Reference | Common return path for both VCC1 and VCC2 monitoring circuits |
| 3 - MR | Debounced Manual-Reset Input | Pull low to force reset; internal 32–100kΩ pullup; glitch rejection <100ns |
| 4 - VCC2 | Secondary Supply Input & Monitor | Power source when VCC2 > VCC1; monitored at 3.08V threshold |
| 5 - WDI | Watchdog Timer Input | Rising/falling edge clears 2.9s timeout; unconnected disables watchdog |
| 6 - VCC1 | Primary Supply Input & Monitor | Power source when VCC1 > VCC2; monitored at 4.63V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous 4.63V and 3.08V thresholds eliminate need for discrete comparators or multiple supervisors |
| Two-mode watchdog timer | 46.4s startup + 2.9s normal timeout prevents false resets during boot while ensuring fast runtime fault detection |
| Open-drain RST output | Enables wired-OR reset bus configuration and safe interfacing with bidirectional μP reset I/O ports |
| Guaranteed reset validity to 1.0V | Ensures functional reset assertion even as one supply collapses to 1.0V, critical for graceful shutdown |
| Low 20µA supply current | Extends battery life in portable equipment without compromising supervision accuracy |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLCs and motor drives requiring coordinated reset across 5V logic and 3.3V I/O rails during AC line sags. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RST to halt CPU execution until both rails stabilize above 4.63V and 3.08V. Use Value: Prevents firmware corruption by guaranteeing reset remains asserted until both supplies meet precision thresholds, not just nominal levels. | Use Scenario: Battery-powered glucose meters where main 5V rail and sensor 3.3V rail must be validated before ADC sampling. IC Role / Device Role / Timing Role: Monitors VCC1 (5V) and VCC2 (3.3V) simultaneously; triggers 100ms reset pulse if either drops below threshold during battery discharge. Use Value: Ensures measurement integrity by blocking data acquisition until both rails are within specification, eliminating erroneous readings. |
| Communications Gateways | Smart Energy Meters |
Use Scenario: Cellular IoT gateways with separate 5V modem and 3.3V MCU rails subject to transient noise on shared power distribution. IC Role / Device Role / Timing Role: Uses WDI input to supervise MCU activity; generates reset if watchdog feed stops for >2.9s, indicating software hang or RF interference. Use Value: Recovers unresponsive communication stacks autonomously without host intervention, improving field uptime. | Use Scenario: Revenue-grade meters operating in harsh electrical environments with frequent voltage sags on 5V and 3.3V rails. IC Role / Device Role / Timing Role: Provides 20µA ultra-low-power supervision with 46.4s watchdog startup to accommodate meter boot sequence before enabling runtime monitoring. Use Value: Eliminates need for external RC timing components while maintaining compliance with IEC 62053-21 reset timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6359LTUT | Push-pull RST output referenced to VCC1; same thresholds and watchdog specs | Requires no external pull-up; incompatible with wired-OR reset buses | Select when direct drive into μP reset pin is preferred and shared reset bus is unnecessary |
| TPS3808G33DBVR | Single-supply (3.3V only), no watchdog, 200ms reset timeout, 2.5µA IQ | Lacks dual-rail monitoring and watchdog; suited for simpler single-rail systems | Select only for cost-sensitive, single-voltage applications where watchdog and dual monitoring are not required |
Compared with MAX6359LTUT, MAX6358LTUT offers open-drain flexibility for multi-device reset coordination but requires an external pull-up; versus TPS3808G33DBVR, it provides essential dual-supply coverage and watchdog functionality at higher quiescent current, making it irreplaceable in multivoltage safety-critical designs.
Availability
MAX6358LTUT is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, communications gateways, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6358LTUT 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, automotive, and computing applications, emphasizing reliability, low power, and integration.
The MAX6351–MAX6360 family targets multivoltage embedded systems needing simultaneous rail monitoring, programmable reset timing, and watchdog supervision-all in miniature SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6358LTUT?
The MAX6358LTUT has a factory-set VCC1 threshold of 4.63V (±0.09V at +25°C) and VCC2 threshold of 3.08V (±0.05V at +25°C), as defined by the "LT" suffix in the Voltage Threshold Levels table. These values are precision-trimmed and guaranteed over -40°C to +85°C.
Does the MAX6358LTUT provide a push-pull or open-drain reset output?
The MAX6358LTUT provides an active-low open-drain RST output (Pin 1), requiring an external pull-up resistor. This differs from push-pull variants like MAX6359LTUT and enables wired-OR reset bus configurations and safe interfacing with bidirectional μP reset pins.
How does the watchdog timer function on the MAX6358LTUT?
The MAX6358LTUT watchdog timer operates in two modes: a 46.4s startup timeout after power-on or manual reset, followed by a 2.9s normal timeout. A rising or falling edge on WDI (Pin 5) clears the timer; failure to refresh within the timeout period asserts RST. Leaving WDI unconnected disables the watchdog.
Can the MAX6358LTUT operate if one supply drops below 1.0V?
No-the MAX6358LTUT guarantees valid RST output only while at least one supply (VCC1 or VCC2) remains ≥1.0V. If both fall below 1.0V, reset behavior is undefined. This 1.0V minimum ensures functional reset assertion during partial rail collapse, as confirmed in Absolute Maximum Ratings and Electrical Characteristics.
What package type and footprint does the MAX6358LTUT use?
The MAX6358LTUT uses a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), measuring 1.6mm × 2.9mm with 0.95mm height. Pin 1 is RST, Pin 2 is GND, Pin 3 is MR, Pin 4 is VCC2, Pin 5 is WDI, and Pin 6 is VCC1-matching the MAX6358-specific pin configuration shown in the datasheet's Pin Configurations section.
MAX6358LTUT 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:
- 2
- Voltage - Threshold:
- 3.08V, 4.63V
- 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-23-6
MAX6358LTUT FAQ
1.How can I place an order for MAX6358LTUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6358LTUT 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 MAX6358LTUT reliable?
The price and inventory of MAX6358LTUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6358LTUT is usually 5 days.
3.What payment methods are accepted for MAX6358LTUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6358LTUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6358LTUT?
MAX6358LTUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6358LTUT 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 MAX6358LTUT?
For technical support, including MAX6358LTUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6358LTUT requirements.
6.How does Aetrix verify that MAX6358LTUT is sourced from the original manufacturer or authorized distributors?
All MAX6358LTUT 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 MAX6358LTUT meets industry standards.
7.What is the process for return or replacement of MAX6358LTUT?
All MAX6358LTUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6358LTUT, 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 MAX6358LTUT part is unused and in its original packaging.
Return procedure for MAX6358LTUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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