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Analog Devices Inc./Maxim Integrated MAX6827LUT+
- Part No.:
- MAX6827LUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6827LUT+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,349
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Product details
Overview
MAX6827LUT+ from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in 6-pin SOT23 package, designed to monitor primary supply (VCC) and user-adjustable secondary input (RESET IN), with manual reset (MR), watchdog timer (WDI), and push-pull active-high RESET output. It asserts reset when VCC falls below 3.08V (typ), RESET IN drops below 0.63V (typ), MR is pulled low, or WDI times out after 1.6s - maintaining reset for ≥140ms. Used in portable battery-powered equipment and embedded controllers requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6827LUT+ datasheet, MAX6827LUT+ pinout, MAX6827LUT+ application, or MAX6827LUT+ equivalent, this page delivers verified functional identity, confirmed reset thresholds (VTH = 3.08V, VRSTINTH = 0.63V), guaranteed operation down to VCC = +1.2V, push-pull active-high RESET timing, and validated alternative options for dual-supply µP supervision in industrial and portable systems.
Technical Context
The MAX6827LUT+ implements a dual-threshold monitoring architecture: one factory-trimmed VCC reset comparator (3.08V nominal, ±3% over –40°C to +125°C) and one high-impedance RESET IN comparator (0.63V threshold, ±2.4% over temperature) for user-defined secondary voltage monitoring via resistor divider. Its internal 1.6s watchdog timer clears on any WDI edge and triggers reset if no transition occurs within timeout.
Reset assertion is synchronized across all fault sources (VCC undervoltage, RESET IN undervoltage, MR low, WDI timeout), with propagation delays ≤20µs (VCC→RESET) and ≤15µs (RESET IN→RESET), and a minimum 140ms reset timeout period that holds RESET high after recovery. The push-pull active-high RESET output sources ≥200µA at 0.8×VCC and sinks ≥1.2mA at VCC ≥2.55V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V (typ), 2.97V to 3.17V (min/max over –40°C to +125°C) - sets primary supply brownout detection point |
| RESET IN Threshold | 0.63V (typ), 0.61V to 0.65V (min/max over –40°C to +125°C) - enables monitoring of secondary voltages down to 0.6V via external divider |
| 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 (typ), 1.12s to 2.4s (min/max over –40°C to +85°C) - provides software execution supervision with configurable clearing on WDI edges |
| Supply Current (ICC) | 7µA (typ at +25°C, VCC = +3.6V), ≤25µA (max over –40°C to +125°C) - enables ultra-low-power operation in battery-critical systems |
| Operating Voltage Range | +1.2V to +5.5V (VCC, –40°C to +125°C) - guarantees valid reset assertion even during deep brownout conditions |
| RESET Output Type | Push-pull active-high - eliminates need for external pull-up resistor and supports direct interface to µP reset inputs requiring high-assertion |
Pinout & Package
Package: 6-pin SOT23 (U6+1, outline 21-0058), lead-free, –40°C to +125°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high push-pull reset output | Drives high during normal operation; pulls low only during reset assertion - compatible with µPs requiring active-high reset initiation |
| 2 - GND | Ground reference | Common return path for all internal comparators, timer, and output stage; must be low-impedance connection |
| 3 - MR | Manual reset input (active-low) | Internal 50kΩ pullup to VCC; pulling low forces immediate reset and holds it for full timeout period after release |
| 4 - WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer - left unconnected to disable watchdog function |
| 5 - RESET IN | User-adjustable secondary monitor input | High-impedance (≤100nA leakage) comparator input with 0.63V threshold - connects to resistor divider for custom voltage monitoring |
| 6 - VCC | Primary supply input | Power source for internal circuitry and reference; also supplies bias to RESET IN pin - must remain >0.63V for RESET IN functionality |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary VCC (3.08V threshold) and user-defined secondary voltage (via 0.63V RESET IN pin), enabling multivoltage system reliability |
| Guaranteed reset validity down to VCC = +1.2V | Ensures correct reset state during severe brownout - critical for fail-safe operation in battery-powered devices nearing end-of-life |
| 1.6s programmable watchdog timer | Clears on any WDI edge (≥50ns pulse); prevents runaway code without requiring precise software timing or dedicated timer peripherals |
| No external components required | Integrates precision references, comparators, delay generator, and push-pull driver - reduces BOM count and PCB area vs. discrete solutions |
| Immunity to short negative VCC transients | Withstands ≤20µs negative glitches up to 100mV below threshold without spurious reset - improves noise robustness in electrically noisy environments |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
|
Use Scenario: Handheld medical monitors powered by single-cell Li-ion batteries experiencing voltage sag under load. IC Role / Device Role / Timing Role: MAX6827LUT+ monitors main rail (3.3V) and core logic rail (1.2V via RESET IN divider), asserting active-high RESET if either drops below threshold during transient load. Use Value: Prevents corrupted memory writes and processor lockup during battery voltage droop, extending usable runtime while ensuring deterministic restart. |
Use Scenario: Industrial PLC controller with dual 3.3V I/O and 1.8V core supplies, requiring deterministic boot sequence after power interruption. IC Role / Device Role / Timing Role: MAX6827LUT+ supervises both rails and provides 140ms minimum reset hold time to guarantee FPGA configuration completes before CPU release. Use Value: Eliminates need for separate reset ICs per rail and avoids race conditions between supply stabilization and processor initialization. |
| Intelligent Instruments | Critical µP Monitoring |
|
Use Scenario: Portable oscilloscope with analog front-end (±5V), digital logic (3.3V), and ADC reference (2.5V) - all derived from single DC/DC converter. IC Role / Device Role / Timing Role: MAX6827LUT+ monitors 3.3V main supply and 2.5V reference rail (via RESET IN), triggering reset if either fails, while WDI verifies firmware health. Use Value: Ensures measurement integrity by preventing operation with invalid reference voltage or corrupted control firmware. |
Use Scenario: Automotive body control module where µP must never execute undefined code due to supply instability. IC Role / Device Role / Timing Role: MAX6827LUT+ provides redundant supervision: VCC monitoring (3.08V) plus watchdog-driven reset, with MR for service-mode reinitialization. Use Value: Meets ASIL-B functional safety requirements through hardware-enforced reset assertion and independent fault detection paths. |
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 |
|---|---|---|---|
| MAX6826LUT+ | Active-low push-pull RESET output; identical VCC threshold (3.08V) and RESET IN capability | Requires µP with active-low reset input; incompatible with active-high reset pins without level-shifting | Select when interfacing with legacy µPs specifying active-low reset assertion and no bidirectional reset I/O |
| MAX6830LUT+ | Factory-trimmed VCC2 monitor (2.313V) instead of user-adjustable RESET IN; same VCC threshold and push-pull active-high RESET | Fixed secondary monitoring only - cannot adapt to arbitrary voltage rails like 1.2V or 1.8V without external scaling | Select when supervising standard 2.5V/3.3V dual-rail systems and simplicity outweighs flexibility |
Compared with MAX6826LUT+, the MAX6827LUT+ provides active-high reset compatibility without external components; compared with MAX6830LUT+, it offers broader secondary voltage adaptability via RESET IN, making it optimal for custom multivoltage designs where rail combinations vary across product variants.
Availability
MAX6827LUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.
Supply support for MAX6827LUT+ 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 was engineered specifically for ultra-low-voltage dual-rail microprocessor supervision in space-constrained, battery-sensitive systems - emphasizing guaranteed operation down to 1.2V, minimal quiescent current, and integrated watchdog functionality.
FAQ
What is the exact VCC reset threshold voltage for MAX6827LUT+?
The MAX6827LUT+ has a factory-trimmed VCC reset threshold of 3.08V (typical), with guaranteed limits of 2.97V (minimum) to 3.17V (maximum) over the full –40°C to +125°C operating temperature range. This value corresponds to the "T" suffix in the MAX6827 naming convention and is specified in the Electrical Characteristics table of the official datasheet.
Does MAX6827LUT+ support monitoring a 1.2V supply as the secondary voltage?
Yes, the MAX6827LUT+ supports monitoring a 1.2V supply using its RESET IN pin. Since the internal threshold is 0.63V (typ), a simple resistor divider (e.g., R1 = 90.9kΩ, R2 = 100kΩ) scales 1.2V down to ~0.63V at the pin. The device's high-impedance input (≤100nA leakage) ensures minimal loading, preserving accuracy across temperature.
What is the watchdog timeout behavior of MAX6827LUT+ and how is it cleared?
The MAX6827LUT+ features a nominal 1.6s watchdog timeout (1.12s to 2.4s over –40°C to +85°C). It is cleared on any rising or falling edge at the WDI pin - including pulses as short as 50ns. If WDI is left unconnected, the internal driver disables the watchdog by periodically toggling, making explicit clearing unnecessary in static applications.
Can MAX6827LUT+ operate reliably when VCC drops to 1.5V?
Yes, the MAX6827LUT+ is fully specified to operate down to VCC = +1.2V over –40°C to +125°C, with guaranteed reset assertion validity. At 1.5V, all functions - including VCC monitoring, RESET IN comparison, MR response, and push-pull RESET output drive - remain functional per datasheet limits, making it suitable for deep brownout scenarios in low-voltage systems.
Is MAX6827LUT+ pin-compatible with MAX6826LUT+ or MAX6828LUT+?
No, MAX6827LUT+ is not pin-compatible with MAX6826LUT+ or MAX6828LUT+ in terms of reset polarity or secondary monitoring function. While all share the same 6-pin SOT23 footprint and pin assignments, MAX6826LUT+ outputs active-low RESET, MAX6828LUT+ uses open-drain RESET, and MAX6827LUT+ provides active-high push-pull - requiring different µP interface logic and PCB routing.
MAX6827LUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.63V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6827LUT+ FAQ
1.How can I place an order for MAX6827LUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6827LUT+ 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 MAX6827LUT+ reliable?
The price and inventory of MAX6827LUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6827LUT+ is usually 5 days.
3.What payment methods are accepted for MAX6827LUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6827LUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6827LUT+?
MAX6827LUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6827LUT+ 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 MAX6827LUT+?
For technical support, including MAX6827LUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6827LUT+ requirements.
6.How does Aetrix verify that MAX6827LUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6827LUT+ 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 MAX6827LUT+ meets industry standards.
7.What is the process for return or replacement of MAX6827LUT+?
All MAX6827LUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6827LUT+, 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 MAX6827LUT+ part is unused and in its original packaging.
Return procedure for MAX6827LUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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