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Analog Devices Inc./Maxim Integrated MAX6828LUT+T
- Part No.:
- MAX6828LUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6828LUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,788
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Product details
Overview
MAX6828LUT+T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC in 6-pin SOT23 package, featuring open-drain active-low RESET output, manual reset (MR) input, watchdog timer (1.6s timeout), and user-adjustable RESET IN threshold (0.63V typ). It monitors primary supply VCC (3.08V threshold, T-suffix) and secondary supply via RESET IN pin down to +0.6V, and guarantees valid reset operation down to VCC = +1.0V. Used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6828LUT+T datasheet, MAX6828LUT+T pinout, MAX6828LUT+T application, or MAX6828LUT+T equivalent, this page delivers verified circuit role (dual-supply µP supervisor), exact reset thresholds (VCC = 3.08V, RESET IN = 0.63V), open-drain output behavior, watchdog timing (1.6s), and validated alternatives for multivoltage embedded systems requiring guaranteed reset assertion at low VCC.
Technical Context
The MAX6828LUT+T implements a dual-threshold monitoring architecture: one factory-trimmed VCC threshold (3.08V ±3%, T-suffix) and one high-impedance RESET IN comparator with 0.63V internal reference, enabling external resistor-divider configuration for secondary voltage monitoring down to +0.6V. Its open-drain RESET output supports bidirectional µP reset pins and requires an external pullup.
It integrates a 1.6s watchdog timer cleared by WDI edge transitions, a manual-reset input with internal 50kΩ pullup, and a 140ms minimum reset timeout period. All functions operate across –40°C to +125°C with guaranteed reset validity at VCC ≥ +1.0V and immunity to ≤20µs negative VCC transients below threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V (min 2.97V, max 3.17V at –40°C to +125°C); sets primary supply brownout detection point for +3.3V systems |
| RESET IN Threshold | 0.63V (typ), adjustable via external divider; enables monitoring of secondary supplies as low as +0.6V |
| Reset Timeout Period | 140ms (min), 200ms (typ), 280ms (max); ensures µP remains held in reset long enough for stable power recovery |
| Watchdog Timeout | 1.6s (nominal), 1.12–2.4s range over temperature; provides software execution supervision without external RC timing |
| Supply Current (VCC = 3.6V) | 7–25µA over –40°C to +125°C; enables ultra-low-power operation in battery-critical applications |
| Operating Voltage Range | +1.2V to +5.5V (over full temperature range); supports operation during deep brownout conditions |
| RESET Output Type | Open-drain, active-low; allows wired-OR reset bus and compatibility with bidirectional µP reset I/O (e.g., Motorola 68HC11) |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant lead-free (indicated by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup; asserts low on VCC drop, MR low, or WDI timeout |
| 2 | GND | Ground reference for all internal comparators and logic; must be connected to system ground plane |
| 3 | MR | Manual reset input, active-low, internally pulled up to VCC (50kΩ); momentary GND connection forces system reset |
| 4 | WDI | Watchdog input; rising/falling edge clears 1.6s timer; left unconnected or three-stated disables watchdog |
| 5 | RESET IN | User-adjustable monitor input; high-impedance node referenced to 0.63V internal comparator; connects to resistor divider for secondary supply monitoring |
| 6 | VCC | Primary supply input; powers device and sets VCC reset threshold (3.08V for T-suffix); also supplies RESET IN comparator |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Monitors VCC (3.08V) and secondary voltage via RESET IN (0.63V reference), enabling robust multivoltage system supervision |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset assertion even during severe brownout, critical for fail-safe embedded controllers |
| Open-drain RESET with no external components | Eliminates need for level-shifting or buffering when interfacing with bidirectional µP reset pins |
| 140ms minimum reset timeout | Provides sufficient hold time for power stabilization and clock lock before µP release, preventing boot failure |
| 1.6s watchdog timer with edge-triggered clear | Enables reliable software hang detection without requiring precise pulse timing or dedicated timer peripherals |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Power management in handheld medical devices with dual Li-ion cell and regulated 1.8V/3.3V rails. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if main 3.3V rail drops below 3.08V or core 1.8V rail falls below 0.63V × (R1+R2)/R2. Use Value: Prevents corrupted memory writes and undefined state during battery discharge or load switching transients. |
Use Scenario: Industrial PLC module with ARM Cortex-M4, 3.3V I/O, and 1.2V core supply. IC Role / Device Role / Timing Role: Monitors 3.3V VCC (T-suffix) and 1.2V core via RESET IN divider; asserts open-drain RESET to bidirectional µP pin. Use Value: Guarantees clean boot after cold start or brownout, with no PCB layout changes needed for reset bus sharing. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable oscilloscope with FPGA, ADC, and multiple isolated analog supplies. IC Role / Device Role / Timing Role: Supervises 3.3V FPGA I/O rail and 2.5V ADC reference rail using RESET IN divider; manual reset for field calibration recovery. Use Value: Eliminates need for discrete reset ICs per rail, reducing BOM count and board area in space-constrained enclosures. |
Use Scenario: Automotive-grade telematics ECU requiring ASIL-B–compatible power sequencing. IC Role / Device Role / Timing Role: Primary VCC monitor (3.08V) and watchdog supervisor; RESET output drives µP reset with 140ms hold time and 1.6s software supervision. Use Value: Meets functional safety requirements for deterministic reset assertion under transient faults and software lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply µP supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6827LUT+T | Push-pull active-high RESET output; identical VCC threshold (3.08V) and RESET IN capability | Requires redesign of reset bus pullup/pulldown and µP reset polarity handling | Select when µP requires active-high reset signal and board layout allows push-pull drive without contention |
| MAX6831LUT+T | Factory-trimmed VCC2 monitor (2.313V for Z-suffix) instead of RESET IN; same open-drain RESET and watchdog | Replaces adjustable secondary monitoring with fixed 2.5V rail supervision; no external divider needed | Select when secondary supply is stable 2.5V and design prioritizes simplicity over flexibility in secondary threshold setting |
Compared with MAX6828LUT+T, MAX6827LUT+T offers active-high push-pull reset but lacks open-drain flexibility for shared buses, while MAX6831LUT+T trades adjustable RESET IN for factory-set VCC2 monitoring-enabling faster qualification for fixed-rail systems but reducing adaptability to custom voltage domains.
Availability
MAX6828LUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6828LUT+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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6826–MAX6831 family delivers dual-supply µP supervision in ultra-small SOT23 packages, targeting space-constrained, low-power embedded systems where reliability during brownout and software fault conditions is critical.
FAQ
What is the exact VCC reset threshold voltage for MAX6828LUT+T?
The MAX6828LUT+T has a factory-trimmed VCC reset threshold of 3.08V nominal, with guaranteed min/max values of 2.97V and 3.17V over the full operating temperature range (–40°C to +125°C). This T-suffix threshold is optimized for monitoring standard +3.3V power rails in portable and embedded systems, and is specified in the Electrical Characteristics table of the MAX6826–MAX6831 datasheet.
Does MAX6828LUT+T support monitoring a secondary supply below 1.0V?
Yes, the MAX6828LUT+T supports monitoring secondary supplies as low as +0.6V using its RESET IN pin, which features an internal 0.63V reference comparator. By connecting an external resistor divider between the secondary supply and GND, with the midpoint fed to RESET IN, the trip point becomes VMONITOR = 0.63V × (R1 + R2)/R2. This capability is explicitly confirmed for MAX6826/MAX6827/MAX6828 variants in the General Description and Selector Guide.
What is the watchdog timeout period for MAX6828LUT+T, and how is it cleared?
The MAX6828LUT+T features a nominal 1.6s watchdog timeout period, with a guaranteed range of 1.12s to 2.4s over temperature. The watchdog timer is cleared by any rising or falling edge on the WDI pin - not by level, but by transition. This edge-triggered mechanism allows flexible software integration, such as toggling WDI at different program points to detect stuck loops, as detailed in the Watchdog Software Considerations section of the datasheet.
Can MAX6828LUT+T operate reliably when VCC drops to 1.0V?
Yes, the MAX6828LUT+T is guaranteed to assert a valid reset signal down to VCC = +1.0V across the full temperature range. This specification is explicitly stated in the General Description and confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. It ensures deterministic behavior during deep brownout conditions where other supervisors may fail to hold reset, making MAX6828LUT+T suitable for critical power-fail detection in battery-backed systems.
What package type and RoHS status does MAX6828LUT+T use?
The MAX6828LUT+T uses a 6-pin SOT23 package (outline U6+1, land pattern 90-0175) and is RoHS-compliant, indicated by the "+T" suffix in the part number. The "+" denotes lead-free packaging per Maxim Integrated's package coding convention, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 requirements. Full mechanical drawings and footprint data are available at maximintegrated.com/packages.
MAX6828LUT+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:
- 4.63V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6828LUT+T FAQ
1.How can I place an order for MAX6828LUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6828LUT+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 MAX6828LUT+T reliable?
The price and inventory of MAX6828LUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6828LUT+T is usually 5 days.
3.What payment methods are accepted for MAX6828LUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6828LUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6828LUT+T?
MAX6828LUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6828LUT+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 MAX6828LUT+T?
For technical support, including MAX6828LUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6828LUT+T requirements.
6.How does Aetrix verify that MAX6828LUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6828LUT+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 MAX6828LUT+T meets industry standards.
7.What is the process for return or replacement of MAX6828LUT+T?
All MAX6828LUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6828LUT+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 MAX6828LUT+T part is unused and in its original packaging.
Return procedure for MAX6828LUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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