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Analog Devices Inc./Maxim Integrated MAX6355LTUT+T
- Part No.:
- MAX6355LTUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6355LTUT+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,912
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Product details
Overview
MAX6355LTUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with open-drain reset output, monitoring VCC1 (4.63V threshold), VCC2 (3.08V threshold), and a third voltage via RSTIN (1.22V fixed threshold). It features 20µA supply current, 100ms min reset pulse width, and operates over -40°C to +85°C in a 6-pin SOT23 package for multivoltage embedded systems.
For engineers reviewing the MAX6355LTUT+T datasheet, MAX6355LTUT+T pinout, MAX6355LTUT+T application, or MAX6355LTUT+T equivalent, key selection criteria include dual-supply monitoring with third-voltage capability, open-drain reset compatibility with varied logic families, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, and manual-reset debouncing without external components.
Technical Context
The MAX6355LTUT+T implements independent precision voltage comparators for VCC1 (4.63V ±0.09V), VCC2 (3.08V ±0.07V), and RSTIN (1.22V ±0.03V), each with 20ppm/°C tempco and 500mV hysteresis. Reset assertion occurs if any monitored supply drops below its threshold, and the open-drain RST output remains valid as long as either VCC1 or VCC2 exceeds +1.0V.
It integrates a debounced TTL/CMOS-compatible manual-reset input (MR) with 1µs minimum pulse width and 100ns glitch rejection, and supports third-voltage monitoring via an external resistive divider on RSTIN - enabling flexible undervoltage detection beyond the fixed 1.22V internal reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.63V ±0.09V at +25°C; ensures reliable reset initiation when primary supply falls below nominal 4.63V rail |
| VCC2 Threshold | 3.08V ±0.07V at +25°C; provides accurate supervision of secondary 3.08V supply in dual-rail systems |
| RSTIN Threshold | 1.22V ±0.03V; enables precise third-voltage monitoring (e.g., 1.2V core) using external resistor divider |
| Supply Current | 20µA typical; minimizes quiescent power draw in battery-powered or low-power embedded applications |
| Reset Pulse Width | 100ms minimum; guarantees sufficient duration for microprocessor initialization and state recovery |
| Operating Temp | -40°C to +85°C; fully specified for industrial-grade reliability without derating |
| Reset Output Type | Active-low open-drain; allows wired-OR configuration and level-shifting across mixed-voltage domains |
Pinout & Package
MAX6355LTUT+T is housed in a lead(Pb)-free 6-pin SOT23 package (U6-1 outline), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted. Pin 1 is RST (open-drain), 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 - RST | Active-low open-drain reset output | Drives low during fault; requires external pull-up; compatible with 1.8V–5.5V logic families |
| 2 - GND | Ground reference | Common return path for all internal comparators and digital logic; must be low-impedance |
| 3 - MR | Debounced manual-reset input | Pull low to force reset; internally debounced; valid for VCC1 ≥ 1.2V |
| 4 - VCC2 | Secondary supply input & monitor | Power source and voltage monitor; trip point = 3.08V; powers internal circuitry when > VCC1 |
| 5 - RSTIN | Third-voltage comparator input | Monitors external voltage via resistive divider; fixed 1.22V internal reference; referenced to VCC1 |
| 6 - VCC1 | Primary supply input & monitor | Power source and voltage monitor; trip point = 4.63V; powers internal circuitry when > VCC2 |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC1 (4.63V), VCC2 (3.08V), and third voltage via RSTIN (1.22V ref), eliminating need for discrete supervisors in multirail systems |
| Open-drain RST output | Enables shared reset bus across multiple voltage domains and supports pull-up to any logic rail from 1.8V to 5.5V |
| Guaranteed operation down to 1V | RESET remains valid even if VCC1 or VCC2 drops to +1.0V, ensuring robust fail-safe behavior during brownout |
| 20ppm/°C threshold tempco | Ensures stable trip points across full -40°C to +85°C range, critical for industrial temperature stability |
| No external components required | Factory-trimmed thresholds and integrated debouncing eliminate capacitors, resistors, or timing components for basic supervision |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Supervising 4.63V system rail, 3.08V I/O rail, and 1.2V FPGA core voltage in programmable logic controllers exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting open-drain reset to CPU and FPGA upon any rail undervoltage, with guaranteed validity down to 1V per rail. Use Value: Prevents erratic operation during brownout by holding reset until all three rails stabilize above their precise thresholds. | Use Scenario: Power sequencing and fault detection in portable ultrasound devices with battery-backed 3.08V analog front-end, 4.63V display driver, and 1.2V processor core. IC Role / Device Role / Timing Role: Monitors all three critical supplies and asserts reset if any falls below spec; open-drain output interfaces directly to 1.8V microcontroller reset pin. Use Value: Enables single-chip supervision of heterogeneous voltage domains, reducing BOM count and PCB area in space-constrained medical enclosures. |
| Automotive Infotainment Gateways | Smart Energy Meters |
Use Scenario: Monitoring 4.63V MCU supply, 3.08V CAN transceiver rail, and 1.2V SoC core in thermally demanding vehicle cabin environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Provides temperature-stable triple-supply supervision with 20ppm/°C tempco and 100ms reset pulse to ensure deterministic boot after cold crank. Use Value: Eliminates risk of partial initialization due to rail collapse by guaranteeing reset assertion before any monitored supply crosses its factory-trimmed threshold. | Use Scenario: Supervising 4.63V metering ASIC supply, 3.08V RTC backup rail, and 1.2V microcontroller core in utility-grade electricity meters requiring >10-year field life. IC Role / Device Role / Timing Role: Delivers ultra-low 20µA quiescent current while maintaining precise thresholds across lifetime temperature cycling. Use Value: Extends battery backup runtime for real-time clock and secure boot functions without compromising supervision accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356LTUT+T | Push-pull RST output referenced to VCC1 (vs. open-drain); same VCC1/VCC2 thresholds and RSTIN specs | Requires no external pull-up; incompatible with wired-OR reset buses or level-shifting topologies | Select when driving a single load with known VCC1-level logic and no shared reset line |
| TPS3808G33DBVR | Dual-supply only (no RSTIN); 3.3V fixed VDD threshold; 350ms reset timeout; 1.5µA IQ | Lacks third-voltage monitoring capability; optimized for ultra-low-power single-rail systems | Select only if third-voltage supervision is unnecessary and sub-µA quiescent current is mandatory |
Compared with MAX6356LTUT+T, the MAX6355LTUT+T offers open-drain flexibility for multi-load or mixed-voltage reset distribution, while TPS3808G33DBVR trades triple-supply capability for lower IQ and longer reset timeout - making MAX6355LTUT+T the sole choice when RSTIN-based third-voltage monitoring is required.
Availability
MAX6355LTUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical diagnostics, automotive infotainment gateways, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6355LTUT+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, mixed-signal, and RF ICs for industrial, computing, communications, and consumer applications.
The MAX6351–MAX6360 family delivers precision multivoltage supervision for complex embedded systems where simultaneous monitoring of two or three power rails is essential to prevent undefined microprocessor states.
FAQ
What is the function of the RSTIN pin on the MAX6355LTUT+T?
The RSTIN pin on the MAX6355LTUT+T is a dedicated third-voltage comparator input with a fixed 1.22V threshold. It allows monitoring of an additional supply (e.g., a 1.2V core rail) using an external resistive divider. The pin is powered from VCC1, and its voltage must not exceed VCC1. This feature distinguishes the MAX6355LTUT+T from dual-supply-only variants like MAX6351–MAX6354 and enables true triple-voltage supervision in a single IC.
Does the MAX6355LTUT+T provide watchdog timer functionality?
No, the MAX6355LTUT+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6355LTUT+T is specifically configured for triple-voltage supervision with open-drain reset and RSTIN input, omitting WDI and associated timing circuitry. For watchdog capability alongside triple-supply monitoring, MAX6356LTUT+T or MAX6357LTUT+T are not alternatives - no variant combines both RSTIN and WDI.
What are the exact voltage thresholds for VCC1 and VCC2 on the MAX6355LTUT+T?
The MAX6355LTUT+T has a VCC1 threshold of 4.63V (±0.09V over -40°C to +85°C) and a VCC2 threshold of 3.08V (±0.07V over -40°C to +85°C). These values are factory-trimmed and specified in the Voltage-Threshold Levels table under suffix "LT". The thresholds are guaranteed across temperature and supply variations, with 20ppm/°C tempco and 500mV hysteresis to prevent chatter near trip points.
Can the MAX6355LTUT+T operate with VCC1 or VCC2 below 1.2V?
The MAX6355LTUT+T guarantees RESET output validity as long as either VCC1 or VCC2 remains above +1.0V, but its specified operating range begins at +1.2V for both supplies. Below 1.2V, the device may not meet all electrical specifications - including RSTIN input accuracy, MR debounce performance, and threshold tolerance. Therefore, while functional reset assertion is ensured down to 1.0V, full specification compliance requires VCC1 and VCC2 ≥ 1.2V.
Is the MAX6355LTUT+T pin-compatible with other devices in the MAX6351–MAX6360 family?
Yes, the MAX6355LTUT+T shares the same 6-pin SOT23 (U6-1) package and pinout as MAX6351, MAX6356–MAX6360, with Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = RSTIN (or WDI or RST2 depending on variant), and Pin 6 = VCC1. However, functional pin assignments differ: RSTIN on MAX6355LTUT+T replaces WDI on MAX6358–MAX6360 and RST2 on MAX6351, so direct substitution requires verifying peripheral connectivity and firmware reset-handling logic.
MAX6355LTUT+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:
- 3
- Voltage - Threshold:
- 3.08V, 4.63V, Adj
- 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
MAX6355LTUT+T FAQ
1.How can I place an order for MAX6355LTUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6355LTUT+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 MAX6355LTUT+T reliable?
The price and inventory of MAX6355LTUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6355LTUT+T is usually 5 days.
3.What payment methods are accepted for MAX6355LTUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6355LTUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6355LTUT+T?
MAX6355LTUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6355LTUT+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 MAX6355LTUT+T?
For technical support, including MAX6355LTUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6355LTUT+T requirements.
6.How does Aetrix verify that MAX6355LTUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6355LTUT+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 MAX6355LTUT+T meets industry standards.
7.What is the process for return or replacement of MAX6355LTUT+T?
All MAX6355LTUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6355LTUT+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 MAX6355LTUT+T part is unused and in its original packaging.
Return procedure for MAX6355LTUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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