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Analog Devices Inc./Maxim Integrated MAX6356LSUT+
- Part No.:
- MAX6356LSUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6356LSUT+.pdf
- Description:
- MAX6356 TRIPLE-VOLTAGE MICROPROC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6356LSUT+ from Maxim Integrated is a dual-voltage microprocessor supervisory IC with precision reset threshold monitoring for VCC1 (4.63V) and VCC2 (2.93V), 20µA supply current, 100ms min power-on reset pulse width, and an adjustable third-voltage monitor input (RSTIN, 1.22V threshold). It delivers push-pull active-low RESET referenced to VCC1 in a 6-pin SOT23 package for multivoltage embedded systems requiring reliable power sequencing and brownout detection.
For engineers reviewing the MAX6356LSUT+ datasheet, MAX6356LSUT+ pinout, MAX6356LSUT+ application, or MAX6356LSUT+ equivalent, key selection criteria include its dual-supply reset assertion logic, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, RSTIN-based third-voltage monitoring capability, and compatibility with TTL/CMOS manual reset inputs in industrial and portable equipment designs.
Technical Context
The MAX6356LSUT+ implements independent voltage comparators for VCC1 and VCC2, asserting RESET whenever either supply drops below its factory-set threshold (4.63V and 2.93V respectively); RESET remains valid as long as at least one supply exceeds +1.0V. Its RSTIN input enables external resistive-divider-based monitoring of a third voltage with a fixed 1.22V internal reference.
This device uses a debounced TTL/CMOS-compatible manual reset (MR) input and guarantees reset timeout period of 100–280ms after VCC stabilization. Unlike watchdog-equipped variants (e.g., MAX6359), MAX6356LSUT+ omits watchdog functionality - confirmed by absence of WDI pin and exclusion from watchdog timing specifications in all electrical characteristics tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.63V ±0.13V over -40°C to +85°C - ensures precise reset assertion during 5V rail brownout |
| VCC2 Threshold | 2.93V ±0.08V over -40°C to +85°C - provides accurate reset for 3.3V or 2.5V auxiliary rails |
| RSTIN Threshold | 1.22V ±0.03V - enables configurable third-voltage monitoring via external resistor divider |
| Supply Current | 20µA typical - supports ultra-low-power operation in battery-backed systems |
| Reset Pulse Width | 100ms minimum - meets µP reset hold-time requirements without external timing components |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded applications |
| RESET Output Type | Active-low push-pull referenced to VCC1 - eliminates need for external pull-up and ensures defined logic state |
Pinout & Package
MAX6356LSUT+ is housed in a lead-free 6-pin SOT23-6 package (JEDEC MO-178AA), with 1.3mm max height and 0.95mm pitch. Pin 1 is RESET (active-low, push-pull, VCC1-referenced), 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 - RST | Active-low push-pull reset output | Drives low to reset µP when VCC1 or VCC2 falls below threshold; referenced to VCC1 for rail-consistent logic levels |
| 2 - GND | Ground reference | Common return path for all internal comparators and output stage; must be low-impedance for noise immunity |
| 3 - MR | Debounced manual reset input | Pull low to force reset; internally debounced to reject <100ns glitches; requires no external RC network |
| 4 - VCC2 | Secondary supply input & monitor rail | Provides power and voltage monitoring for second system rail (e.g., 3.3V I/O); asserts reset if drops below 2.93V |
| 5 - RSTIN | Adjustable third-voltage monitor input | Accepts divided-down external voltage; internal 1.22V comparator triggers reset when input falls below threshold |
| 6 - VCC1 | Primary supply input & monitor rail | Primary power source and main voltage monitor (e.g., 5V core); asserts reset if drops below 4.63V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of two distinct supply rails (VCC1/VCC2) with factory-trimmed thresholds eliminates discrete comparator + reference solutions |
| Third-voltage monitor input (RSTIN) | Enables monitoring of any additional rail (e.g., 1.8V, 2.5V) using only two external resistors - no extra IC required |
| Push-pull RESET output | Guarantees defined high/low states without external pull-up, reducing BOM count and improving noise margin vs. open-drain alternatives |
| Low 20µA quiescent current | Extends battery life in portable equipment and enables always-on supervision in energy-constrained IoT nodes |
| Valid RESET down to VCC = 1V | Ensures fail-safe reset assertion even during deep brownout conditions where other supervisors lose output control |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Supervising dual-rail power domains (5V core + 3.3V I/O) in programmable logic controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting RESET on either rail undervoltage, with guaranteed operation down to VCC = 1V during brownout recovery. Use Value: Prevents firmware corruption and state machine lockup by enforcing clean reset before µP initialization, eliminating need for external reset timers or discrete comparators. | Use Scenario: Power integrity monitoring in battery-powered ultrasound probes requiring simultaneous supervision of 5V analog front-end and 1.8V digital processor rails. IC Role / Device Role / Timing Role: Primary supervisor for VCC1 (5V) and VCC2 (3.3V), with RSTIN configured to monitor 1.8V rail via resistive divider. Use Value: Reduces component count by consolidating three-rail supervision into single IC, while maintaining 100ms reset pulse width compliant with ARM Cortex-M boot requirements. |
| Automotive Infotainment Head Units | Network Edge Routers |
Use Scenario: Ensuring deterministic startup sequencing across multiple voltage domains (e.g., 5V MCU, 3.3V PHY, 1.2V DDR termination) in thermally stressed automotive cabins. IC Role / Device Role / Timing Role: Dual-supply supervisor with extended temperature range (-40°C to +85°C) and transient-immune reset generation. Use Value: Eliminates risk of partial initialization due to asynchronous rail collapse by asserting RESET whenever either monitored rail violates threshold - critical for ASIL-B functional safety compliance. | Use Scenario: Monitoring primary 12V-to-5V DC/DC output and secondary 5V-to-3.3V LDO output in carrier-grade edge routers with hot-swap capability. IC Role / Device Role / Timing Role: Dual-rail supervisor detecting brownout on main and auxiliary supplies, with MR input enabling remote reset via management controller. Use Value: Enables graceful failover and controlled reboot without requiring FPGA or CPLD intervention, reducing MTTR in distributed network infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356LTUT+ | VCC1 threshold = 4.38V (vs. 4.63V); same VCC2 = 2.93V, RSTIN, and pinout | Suitable for systems with tighter 5V rail tolerance (e.g., regulated switcher outputs) where 4.38V trip avoids nuisance resets | Select MAX6356LTUT+ when VCC1 nominal is 4.5V rather than 5V; otherwise MAX6356LSUT+ matches standard 5V rail monitoring. |
| TPS3808G33DBVR | Single-supply (3.3V only), no RSTIN, no dual-threshold capability; 35µA ICC vs. 20µA | Limited to single-rail monitoring; requires additional IC for dual-rail or third-voltage supervision | Choose only if system has only one critical rail and cost is prioritized over integration; MAX6356LSUT+ provides superior functionality density. |
Compared with MAX6356LTUT+, MAX6356LSUT+ offers higher VCC1 threshold for robust 5V rail supervision; compared with TPS3808G33DBVR, it delivers integrated dual-rail + third-voltage monitoring in one device, reducing board area and validation effort despite slightly higher unit cost.
Availability
MAX6356LSUT+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive infotainment head units, and network edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6356LSUT+ 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, mixed-signal, and power management ICs for industrial, computing, communications, and consumer applications.
The MAX6351–MAX6360 family was engineered specifically for multivoltage microprocessor systems needing coordinated reset assertion across independent power domains, with emphasis on low quiescent current and guaranteed operation under brownout conditions.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6356LSUT+?
The MAX6356LSUT+ has a factory-set VCC1 reset threshold of 4.63V (±0.13V over -40°C to +85°C) and a VCC2 threshold of 2.93V (±0.08V over the same temperature range). These values are confirmed in the Voltage Threshold Levels table and Electrical Characteristics section of the official datasheet, and correspond directly to the "LS" suffix in the part number.
Does the MAX6356LSUT+ include a watchdog timer function?
No, the MAX6356LSUT+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants, which feature WDI pins and specified timeout periods. The MAX6356LSUT+ pinout shows RSTIN at Pin 5 (not WDI), and its Electrical Characteristics table omits all watchdog-related parameters - confirming its role as a dual/third-voltage supervisor only.
How is the third-voltage monitoring implemented on the MAX6356LSUT+?
The MAX6356LSUT+ implements third-voltage monitoring via the RSTIN pin (Pin 5), which connects to an internal 1.22V comparator. To monitor a voltage higher than 1.22V (e.g., 1.8V or 2.5V), an external resistive divider scales the target rail down to the 1.22V threshold. The datasheet specifies VRSTIN must not exceed VCC1, and the input current is limited to ±25nA - ensuring minimal loading on the monitored circuit.
What is the RESET output configuration of the MAX6356LSUT+ and why does it matter?
The MAX6356LSUT+ features an active-low push-pull RESET output referenced to VCC1 (Pin 1). This means it actively drives both HIGH and LOW states without requiring an external pull-up resistor - unlike open-drain variants (e.g., MAX6352). This design reduces component count, improves noise immunity, and ensures predictable logic levels during brownout, making MAX6356LSUT+ ideal for direct interfacing with µP reset inputs.
Can the MAX6356LSUT+ operate reliably when one supply rail drops to 1.0V?
Yes, the MAX6356LSUT+ guarantees valid RESET output operation as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - explicitly stated in the datasheet's "Guaranteed RESET Valid to VCC1 = 1V or VCC2 = 1V" feature and confirmed in Absolute Maximum Ratings. This ensures fail-safe reset assertion during deep brownout events where competing supervisors may lose output control.
MAX6356LSUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.93V, 4.63V
- 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
MAX6356LSUT+ FAQ
1.How can I place an order for MAX6356LSUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6356LSUT+ 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 MAX6356LSUT+ reliable?
The price and inventory of MAX6356LSUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6356LSUT+ is usually 5 days.
3.What payment methods are accepted for MAX6356LSUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6356LSUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6356LSUT+?
MAX6356LSUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6356LSUT+ 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 MAX6356LSUT+?
For technical support, including MAX6356LSUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6356LSUT+ requirements.
6.How does Aetrix verify that MAX6356LSUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6356LSUT+ 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 MAX6356LSUT+ meets industry standards.
7.What is the process for return or replacement of MAX6356LSUT+?
All MAX6356LSUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6356LSUT+, 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 MAX6356LSUT+ part is unused and in its original packaging.
Return procedure for MAX6356LSUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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