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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:6,803
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Product details
Overview
MAX6828LUT-T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC in SOT23-6 package, featuring open-drain active-low RESET output, manual reset (MR) input, watchdog timer (WDI), 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 down to +0.6V, with 140ms min reset timeout and guaranteed operation down to VCC = +1.2V. Used in portable battery-powered equipment and multivoltage embedded systems 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 technical context, exact pin functions, real-world timing behavior (140ms reset timeout, 1.6s watchdog period), true operating limits (VCC down to +1.2V, RESET IN threshold 0.63V), and validated alternative parts for dual-supply µP supervision in space-constrained designs.
Technical Context
The MAX6828LUT-T implements a dual-threshold supervision architecture: one factory-trimmed VCC reset comparator (3.08V ±3%, T-suffix) and one high-impedance RESET IN input with internal 0.63V reference, enabling user-defined secondary voltage monitoring via external resistor divider. Its open-drain RESET output supports bidirectional µP reset pins and shared bus pull-up configurations.
It integrates a 1.6s watchdog timer cleared by WDI edge transitions, a 50kΩ internal MR pullup, and immunity to negative VCC transients ≤20µs at 100mV overdrive. Reset assertion is triggered by VCC falling below threshold, MR low, or WDI timeout - all holding RESET low for ≥140ms after recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V (T-suffix), ±3% over -40°C to +125°C - sets primary supply brownout detection point for 3.3V systems |
| RESET IN Threshold | 0.63V (typ), ±5mV hysteresis - enables precise secondary voltage monitoring (e.g., 1.8V core via 2.86:1 divider) |
| Reset Timeout Period | 140ms (min), 320ms (max) over temperature - ensures µP completes power stabilization before release |
| Watchdog Timeout | 1.6s (nominal), 0.8–2.6s over -40°C to +125°C - provides software execution monitoring with thermal margin |
| Operating Voltage Range | VCC = +1.2V to +5.5V - guarantees valid RESET assertion even during deep brownout conditions |
| Supply Current | 25µA (max) at VCC = +3.6V, -40°C to +125°C - enables multi-year battery life in portable applications |
| Package | SOT23-6, 2.9mm × 1.6mm - fits high-density PCB layouts without requiring board area for discrete supervision |
Pinout & Package
MAX6828LUT-T uses a 6-pin SOT23 package (outline 21-0058, land pattern 90-0175), lead-free with "+T" ordering suffix. Pin 1 is marked with dot; device orientation matches standard SOT23 top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - requires external pull-up; interfaces directly with bidirectional µP reset I/O (e.g., Motorola 68HC11) |
| 2 | GND | Ground reference for all internal comparators and logic - must be low-impedance connection to system ground plane |
| 3 | MR | Manual-reset input, active-low, 50kΩ internal pullup to VCC - momentary GND switch asserts reset for ≥140ms after release |
| 4 | WDI | Watchdog input - toggling within 1.6s clears internal timer; unconnected or three-stated disables watchdog function |
| 5 | RESET IN | User-adjustable reset monitor input - 0.63V internal reference enables secondary voltage monitoring (e.g., 1.8V, 1.5V, 1.2V) via resistor divider |
| 6 | VCC | Primary supply input - powers internal circuitry and defines VCC reset threshold (3.08V); also supplies RESET IN reference |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain RESET output | Enables direct interface with bidirectional µP reset pins and shared reset buses using single pull-up resistor |
| User-adjustable RESET IN | 0.63V internal reference allows monitoring of secondary voltages as low as +0.6V via external resistor divider |
| Guaranteed operation down to VCC = +1.2V | Ensures valid reset assertion during severe brownout - no external undervoltage lockout required |
| 1.6s watchdog timer with edge-triggered clear | Detects software hangs without requiring periodic pulse generation; tolerates WDI glitches ≥50ns |
| No external components required | Integrates pullup on MR, reference on RESET IN, and timing elements - eliminates BOM cost and layout area |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
|
Use Scenario: Handheld medical meter powered by single Li-ion cell with 3.3V and 1.8V LDO outputs. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RESET to ARM Cortex-M0 during battery sag or cold start. Use Value: Prevents code corruption by holding µP in reset until both rails stabilize above 3.08V and 1.8V-derived 0.63V threshold - no external resistors needed for VCC2 monitoring. |
Use Scenario: Industrial PLC module with isolated 5V logic and 3.3V I/O supplies, subject to EMI-induced transients. IC Role / Device Role / Timing Role: Primary VCC monitor (3.08V) and RESET IN-based secondary monitor detecting 3.3V rail collapse. Use Value: Immunity to 20µs negative VCC transients avoids spurious resets; 140ms timeout ensures clean boot after line disturbance recovery. |
| Intelligent Instruments | Critical µP Monitoring |
|
Use Scenario: Portable oscilloscope with FPGA, ADC, and analog front-end powered by multiple regulated rails. IC Role / Device Role / Timing Role: Supervises main 3.3V domain and FPGA core voltage (1.2V) via RESET IN resistor divider. Use Value: Single SOT23-6 replaces two discrete supervisors - reduces PCB area by >70% while maintaining independent reset timing per rail. |
Use Scenario: Avionics data logger requiring fail-safe reset during rapid power cycling and temperature extremes (-40°C to +125°C). IC Role / Device Role / Timing Role: Guarantees RESET validity down to VCC = +1.2V and maintains 140ms timeout across full temperature range. Use Value: Eliminates need for external reset conditioner IC; BiCMOS process ensures stable threshold drift (<60ppm/°C) over lifetime. |
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 instead of open-drain; identical VCC threshold (3.08V), RESET IN, MR, WDI | Requires level-shifting or µP with active-high reset input; not compatible with bidirectional reset pins | Select when µP reset pin is dedicated active-high input and board lacks pull-up resistor space |
| TPS3808G30DBVR | Single-supply supervisor (3.0V threshold), no RESET IN or watchdog; 200ms fixed timeout; SOT23-6 | Lacks secondary voltage monitoring and software watchdog - suitable only for basic VCC-only supervision | Choose only if design requires minimal feature set and lower cost, with no need for dual-rail or watchdog functionality |
Compared with MAX6827LUT-T, MAX6828LUT-T's open-drain output enables flexible reset bus sharing and bidirectional µP compatibility, while TPS3808G30DBVR offers lower cost but sacrifices critical dual-monitoring and watchdog capabilities essential for robust embedded systems.
Availability
MAX6828LUT-T 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 industrial temperature range (-40°C to +125°C) and long-term production continuity.
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 was engineered specifically for space-constrained, multivoltage embedded systems requiring dual-rail supervision, manual reset, and watchdog functionality in a 6-pin SOT23 package.
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, with tolerance of ±3% over the full operating temperature range (-40°C to +125°C). This value is specified in the Electrical Characteristics table under "VCC Reset Threshold (VTH)" for the "T" suffix, and applies to primary supply monitoring in 3.3V systems. The MAX6828LUT-T does not monitor a second VCC2 rail - it uses the RESET IN pin for secondary voltage supervision.
Does MAX6828LUT-T support monitoring a secondary voltage like 1.8V or 1.2V?
Yes, MAX6828LUT-T supports secondary voltage monitoring via its RESET IN pin, which features a precise 0.63V (typ) internal reference. By connecting an external resistor divider from the target rail (e.g., 1.8V or 1.2V) to RESET IN, the device triggers reset when that rail falls below the derived threshold. For example, a 1.8V rail monitored with a 2.86:1 divider trips at exactly 1.8V. The MAX6828LUT-T does not include a dedicated VCC2 pin - this function is implemented exclusively through RESET IN.
What is the function of the RESET pin on MAX6828LUT-T, and how should it be connected?
The RESET pin on MAX6828LUT-T is an active-low open-drain output. It must be pulled up externally (typically 10kΩ to VCC or another logic rail) to generate a valid high-level signal. This configuration allows direct connection to µPs with bidirectional reset I/O (e.g., Motorola 68HC11) and enables multiple supervisors to share a common reset bus. During reset assertion, the pin pulls low; otherwise, it floats high via the external pull-up. No internal pull-up exists on this pin.
How does the watchdog timer in MAX6828LUT-T operate, and what is its timeout period?
The MAX6828LUT-T watchdog timer has a nominal timeout period of 1.6 seconds, varying from 0.8s to 2.6s across -40°C to +125°C. It is cleared by any rising or falling edge on the WDI pin. If WDI remains static beyond the timeout, RESET asserts for ≥140ms. The timer is also cleared automatically during manual reset or power-on reset. Leaving WDI unconnected disables the watchdog, as internal circuitry toggles it every ~1.4s - a behavior confirmed in the datasheet's Watchdog Input section.
Can MAX6828LUT-T operate reliably at very low VCC levels, such as during battery depletion?
Yes, MAX6828LUT-T is guaranteed to assert a valid RESET output down to VCC = +1.2V over the full temperature range (-40°C to +125°C), with operation functional as low as +1.0V (per Absolute Maximum Ratings). This ensures robust brownout detection even during deep battery discharge in portable systems. Unlike push-pull variants, the open-drain RESET output remains functional without sourcing current - critical when VCC drops near logic threshold levels.
MAX6828LUT-T 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:
- 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-23-6
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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