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Analog Devices Inc./Maxim Integrated MAX6828RUT+T
- Part No.:
- MAX6828RUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6828RUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MAX6828RUT+T from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory IC in 6-pin SOT23 package, monitoring primary VCC (3.08V threshold) and secondary VCC2 (2.93V threshold), with open-drain active-low RESET output, manual reset input (MR), and watchdog timer (1.6s timeout). It ensures reliable power-on reset and brownout protection in battery-powered embedded controllers.
For engineers reviewing the MAX6828RUT+T datasheet, MAX6828RUT+T pinout, MAX6828RUT+T application, or MAX6828RUT+T equivalent, this page delivers verified electrical specs, exact pin functions, real-world use cases for multivoltage systems, and two validated alternative parts with documented functional differences.
Technical Context
The MAX6828RUT+T implements dual independent voltage monitoring: a factory-trimmed VCC2 input (2.93V nominal threshold) and a primary VCC monitor set to 3.08V via 'T' suffix. Its open-drain RESET output enables bidirectional µP reset I/O interfacing without contention.
It integrates a 1.6s watchdog timer cleared by WDI edge transitions, a 140ms minimum reset timeout delay, and MR with internal 50kΩ pullup - all operating down to VCC = +1.2V across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 3.08V (±3% over –40°C to +125°C); sets primary supply brownout detection level for 3.3V systems. |
| VCC2 Threshold | 2.93V (±3% over –40°C to +125°C); factory-trimmed secondary supply monitor for I/O rail supervision. |
| RESET Output Type | Active-low open-drain; allows wired-OR configuration and direct interface with bidirectional µP reset pins. |
| Reset Timeout Period | 140ms minimum; guarantees sufficient hold time for µP initialization after supply recovery. |
| Watchdog Timeout | 1.6s nominal (0.8–2.6s over temperature); detects firmware hangs in safety-critical embedded applications. |
| Operating Voltage Range | +1.2V to +5.5V on VCC; ensures valid reset assertion even during deep brownout conditions. |
| Supply Current | 25µA max at –40°C to +125°C (VCC = +3.6V); enables multi-year battery life in portable equipment. |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup for logic-high state; sinks ≥100µA at VCC ≥1.2V. |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O; must be low-impedance connection. |
| 3 | MR | Manual-reset input, active-low; internal 50kΩ pullup to VCC; asserts reset when pulled ≤0.3×VCC. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); resets 1.6s timer on transition; disabled if left floating. |
| 5 | VCC2 | Secondary supply input; factory-trimmed comparator threshold = 2.93V; monitors I/O or core rails. |
| 6 | VCC | Primary supply input; threshold = 3.08V; powers internal circuitry and defines logic levels for MR/WDI. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary (3.08V) and secondary (2.93V) supplies - no external resistors required. |
| Open-drain RESET with bidirectional compatibility | Directly interfaces with µPs like Motorola 68HC11 having shared reset I/O, eliminating level-shifter or buffer ICs. |
| Guaranteed operation down to VCC = +1.2V | Delivers valid reset assertion during severe brownouts where other supervisors fail or latch up. |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - critical for noisy automotive or industrial environments. |
| No external components required | Full supervision functionality achieved with zero external passives - reduces BOM count and PCB area. |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Long-life coin-cell or Li-ion powered handheld meters with dual-rail power (core + I/O). IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset during battery sag or charger disconnect. Use Value: Prevents corrupted EEPROM writes and firmware lockup during intermittent power loss. |
Use Scenario: Industrial PLC modules with separate 3.3V core and 2.8V I/O supplies. IC Role / Device Role / Timing Role: Monitors both rails and triggers watchdog reset if firmware stalls in communication stack. Use Value: Eliminates need for discrete reset generators and external watchdog ICs - saves 2.5mm² PCB space. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable oscilloscopes with FPGA-based signal processing and analog front-end biasing. IC Role / Device Role / Timing Role: Ensures synchronized startup of FPGA configuration and analog subsystems after power-up. Use Value: Guarantees deterministic boot sequence even with mismatched supply ramp rates (e.g., 3.3V before 2.8V). |
Use Scenario: Medical infusion pump controller requiring fail-safe reset on any supply anomaly. IC Role / Device Role / Timing Role: Provides redundant brownout detection beyond µP's internal POR, with 140ms timeout. Use Value: Meets IEC 62304 Class C software safety requirements by preventing execution in undefined voltage states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6828RUT-T | Same die, leaded (SnPb) packaging; identical electrical specs and pinout. | Required where RoHS exemption applies (e.g., legacy aerospace/military programs). | Select MAX6828RUT-T only if leaded solder process is mandated; otherwise prefer +T for RoHS compliance. |
| MAX6830RUT+T | Push-pull RESET output (not open-drain); same VCC/VCC2 thresholds (3.08V/2.93V); identical MR/WDI timing. | Used where µP reset pin is unidirectional input only; cannot interface with bidirectional reset I/O. | Choose MAX6830RUT+T only if system lacks external pullup and requires active-high drive capability on RESET. |
Compared with MAX6828RUT+T, the MAX6828RUT-T offers identical performance in leaded assembly, while MAX6830RUT+T trades open-drain flexibility for push-pull drive strength - neither is pin-compatible replacement due to differing RESET output structure.
Availability
MAX6828RUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply across extended temperature ranges.
Supply support for MAX6828RUT+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 and mixed-signal ICs for power, sensing, and connectivity applications.
The MAX6826–MAX6831 family delivers ultra-low-voltage dual-supply supervision for space-constrained, battery-operated, and high-reliability embedded systems - prioritizing minimal quiescent current and guaranteed operation down to 1.2V.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6828RUT+T?
The MAX6828RUT+T has a factory-trimmed VCC2 threshold of 2.93V (±3%) over –40°C to +125°C, as defined by the 'S' suffix in its ordering code. This value is specified in the Electrical Characteristics table under "VCC2 Reset Threshold" for the S variant and is guaranteed across full temperature range without external calibration.
Does MAX6828RUT+T support bidirectional µP reset pins?
Yes, MAX6828RUT+T supports bidirectional µP reset pins via its open-drain RESET output. When used with a single external pullup resistor, it can assert active-low reset and also allow the µP to drive the line low - enabling shared reset I/O configurations like those found in Motorola 68HC11 and similar controllers.
What is the minimum VCC voltage at which MAX6828RUT+T guarantees valid reset operation?
MAX6828RUT+T guarantees valid reset assertion down to VCC = +1.2V over the full –40°C to +125°C operating temperature range. Below this, reset behavior is not characterized; the device remains functional but may not meet specified timing or threshold accuracy.
How does the watchdog timer in MAX6828RUT+T respond to WDI signal transitions?
The MAX6828RUT+T watchdog timer clears on any rising or falling edge at WDI and times out after 1.6s (nominal) if no further edges occur. The timer remains cleared while RESET is asserted and begins counting only after RESET deasserts - ensuring no false timeouts during active reset conditions.
Can MAX6828RUT+T monitor a secondary supply below 2.93V?
No - MAX6828RUT+T uses a fixed factory-trimmed VCC2 input with 2.93V threshold and does not support user-adjustable secondary monitoring. For sub-2.93V secondary supervision, select MAX6826/MAX6827/MAX6828 variants with RESET IN pin (0.63V threshold) and external resistor divider.
MAX6828RUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V, 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
MAX6828RUT+T FAQ
1.How can I place an order for MAX6828RUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6828RUT+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 MAX6828RUT+T reliable?
The price and inventory of MAX6828RUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6828RUT+T is usually 5 days.
3.What payment methods are accepted for MAX6828RUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6828RUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6828RUT+T?
MAX6828RUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6828RUT+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 MAX6828RUT+T?
For technical support, including MAX6828RUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6828RUT+T requirements.
6.How does Aetrix verify that MAX6828RUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6828RUT+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 MAX6828RUT+T meets industry standards.
7.What is the process for return or replacement of MAX6828RUT+T?
All MAX6828RUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6828RUT+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 MAX6828RUT+T part is unused and in its original packaging.
Return procedure for MAX6828RUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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