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Analog Devices Inc./Maxim Integrated MAX6828TUT+T
- Part No.:
- MAX6828TUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6828TUT+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,486
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Product details
Overview
MAX6828TUT+T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC with open-drain active-low RESET output, manual reset input (MR), and watchdog timer (WDI). It monitors primary VCC (3.08V threshold) and user-adjustable secondary voltage via RESET IN (0.63V internal reference), asserts reset on supply brownout or watchdog timeout, and guarantees valid reset operation down to VCC = +1.2V over –40°C to +125°C. Used in portable battery-powered systems requiring reliable power-on reset and fail-safe recovery.
For engineers reviewing the MAX6828TUT+T datasheet, MAX6828TUT+T pinout, MAX6828TUT+T application, or MAX6828TUT+T equivalent, this page delivers verified circuit role, exact reset thresholds, open-drain drive capability, 140ms minimum reset timeout, and confirmed SOT23-6 package compatibility - all critical for embedded µP reset integrity validation and multivoltage system design.
Technical Context
The MAX6828TUT+T implements a dual-threshold supervision architecture: one factory-trimmed VCC monitor (3.08V nominal at –40°C to +85°C) and one high-impedance RESET IN input referenced to 0.63V, enabling external resistor-divider configuration for secondary supply 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 nominal watchdog timer cleared by WDI edge transitions, a 50kΩ internal MR pullup, and immunity to VCC transients ≤20µs at 100mV overdrive. Reset assertion is guaranteed for VCC ≥ +1.2V across full temperature range, with propagation delays under 25µs and hysteresis of 2×VTH mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V (nominal), ±3% over –40°C to +125°C - sets precise power-fail detection point for primary supply |
| RESET IN Threshold | 0.63V (typical), ±25mV - enables accurate user-defined secondary voltage monitoring via external divider |
| Reset Timeout Period | 140ms (min), 200ms (typ), 280ms (max) - ensures sufficient µP initialization time after supply recovery |
| Watchdog Timeout | 1.6s (nominal), 0.8–2.6s over –40°C to +125°C - provides robust software execution monitoring window |
| RESET Output Type | Open-drain active-low - allows wired-OR reset bus sharing and direct interface to bidirectional µP reset I/O |
| Supply Current | 7µA (typ) at +3.6V, –40°C to +85°C - enables ultra-low-power operation in battery-critical applications |
| Operating Temperature | –40°C to +125°C - qualified for industrial and automotive under-hood environments |
| Package | SOT23-6 - compact 2.9mm × 1.6mm footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6828TUT+T is housed in a lead-free 6-pin SOT23 package (package code U6+1, outline 21-0058), with 0.95mm pitch, 1.6mm width, and 2.9mm length. Thermal resistance θJA = 115°C/W; max continuous power dissipation at +70°C = 696mW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup; sinks up to 1.2mA at VCC ≥ 2.55V |
| 2 | GND | Ground reference for all internal comparators, timers, and logic |
| 3 | MR | Manual reset input (active-low); internally pulled up to VCC with 50kΩ; 1µs minimum pulse width |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears 1.6s timer; disabled if left floating or three-stated |
| 5 | RESET IN | User-adjustable reset monitor input; 0.63V internal reference; high-impedance (±100nA leakage) |
| 6 | VCC | Primary supply input; powers internal circuitry and references RESET IN; operates from +1.2V to +5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Factory-trimmed VCC threshold (3.08V) + user-configurable RESET IN (0.63V reference) - supports primary/secondary rail supervision without external components |
| Open-drain RESET with bidirectional compatibility | Enables direct connection to µPs like Motorola 68HC11 with shared reset buses and external pullup flexibility - eliminates level-shifting requirements |
| Guaranteed reset validity down to VCC = +1.2V | Ensures deterministic reset assertion during deep brownout conditions - critical for low-voltage SoC and battery-depleted operation |
| 140ms minimum reset timeout | Provides sufficient hold time for slow-starting µPs and peripheral initialization - prevents premature code execution |
| Watchdog timer with edge-triggered clear | 1.6s nominal timeout cleared by any WDI transition - detects software hangs without requiring precise pulse timing or polarity |
| No external components required | Integrates pullup on MR, precision voltage references, delay timers, and comparators - reduces BOM count and board area vs. discrete solutions |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
|
Use Scenario: Wearable health monitor powered by single Li-ion cell with 2.8–4.2V range, using 1.8V core and 3.3V I/O rails. IC Role / Device Role / Timing Role: MAX6828TUT+T monitors VCC (3.08V threshold) for main rail and RESET IN (via divider) for 1.8V core, asserting open-drain RESET until both stabilize. Use Value: Prevents erratic startup during battery voltage sag; 7µA quiescent current extends runtime; SOT23-6 footprint saves space on compact PCB. |
Use Scenario: Industrial PLC controller with dual 3.3V and 5V supplies, requiring deterministic reset sequencing and watchdog safety. IC Role / Device Role / Timing Role: MAX6828TUT+T supervises 3.3V VCC and 5V auxiliary rail via RESET IN divider, while WDI tracks firmware heartbeat. Use Value: 140ms reset timeout ensures FPGA configuration completes; open-drain output interfaces cleanly with multiple µP reset pins on backplane. |
| Intelligent Instruments | Critical µP Monitoring |
|
Use Scenario: Handheld multimeter with segmented LCD, MCU, and analog front-end, operating from alkaline batteries. IC Role / Device Role / Timing Role: MAX6828TUT+T monitors main 3V supply and 1.2V reference rail (via RESET IN), triggering reset on battery depletion below 2.7V. Use Value: Factory-trimmed 3.08V threshold ensures consistent low-battery cutoff; –40°C to +125°C rating supports field use in extreme ambient conditions. |
Use Scenario: Medical infusion pump MCU requiring fail-safe restart on power anomaly or software lockup. IC Role / Device Role / Timing Role: MAX6828TUT+T asserts RESET on VCC dip or WDI timeout, with MR allowing clinician-initiated reset via front-panel button. Use Value: Immunity to 20µs VCC glitches prevents spurious resets; 1.6s watchdog window catches infinite loops without false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6827TUT+T | Push-pull active-high RESET output; identical VCC threshold (3.08V) and RESET IN capability | Requires level-compatible µP with active-high reset input; no external pullup needed | Select when µP reset pin is active-high and board layout prohibits pullup resistors |
| MAX6831TUT+T | Open-drain RESET; factory-trimmed VCC2 monitor (2.313V) instead of RESET IN; same VCC threshold (3.08V) | Replaces adjustable secondary monitoring with fixed 2.3V rail supervision; no external divider required | Select when secondary supply is stable 2.3V and design prefers factory-calibrated accuracy over flexibility |
Compared with MAX6827TUT+T and MAX6831TUT+T, the MAX6828TUT+T uniquely combines open-drain RESET with user-adjustable secondary monitoring - making it optimal for designs needing both bidirectional reset bus integration and custom voltage trip points.
Availability
MAX6828TUT+T is available at Aetrix Electronics and suitable for portable electronics, industrial controllers, intelligent instrumentation, and medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6828TUT+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX6826–MAX6831 family was designed specifically for ultra-low-voltage dual-rail microprocessor supervision in space-constrained, battery-sensitive applications - delivering precision reset thresholds, integrated watchdog, and minimal external component count.
FAQ
What is the exact VCC reset threshold voltage for MAX6828TUT+T?
The MAX6828TUT+T has a factory-trimmed VCC reset threshold of 3.08V (nominal), with guaranteed limits of 2.97V (min) to 3.17V (max) over the full –40°C to +125°C operating temperature range. This value is defined by the "T" suffix in the part number and is validated per Maxim's Electrical Characteristics table.
Does MAX6828TUT+T support monitoring a secondary voltage, and how is it configured?
Yes, MAX6828TUT+T supports secondary voltage monitoring via its RESET IN pin, which features a precise 0.63V (typical) internal reference. To monitor a higher voltage, connect an external resistor divider between the target rail and GND, with the midpoint fed to RESET IN. The trip point is calculated as VMONITOR = 0.63V × (R1 + R2)/R2.
What type of RESET output does MAX6828TUT+T provide, and what are its drive capabilities?
MAX6828TUT+T provides an active-low open-drain RESET output. It can sink up to 50µA at VCC ≥ 1.0V, 100µA at VCC ≥ 1.2V, 1.2mA at VCC ≥ 2.55V, and 3.2mA at VCC ≥ 4.25V, with VOL ≤ 0.3V under those conditions. An external pullup resistor is required for proper logic-level translation.
How does the watchdog timer in MAX6828TUT+T operate, and what is its timeout period?
The MAX6828TUT+T watchdog timer has a nominal timeout of 1.6s, varying from 0.8s (min) to 2.6s (max) across –40°C to +125°C. It is cleared by any rising or falling edge on the WDI pin. If WDI remains static beyond timeout, RESET asserts for the full reset timeout period (140ms min). Leaving WDI unconnected disables the watchdog.
Is MAX6828TUT+T compatible with systems requiring operation down to very low VCC voltages?
Yes, MAX6828TUT+T is guaranteed to assert a valid RESET output down to VCC = +1.2V over the full –40°C to +125°C temperature range. Its internal circuitry remains functional and deterministic at this level, ensuring reliable brownout detection even during severe supply droop.
MAX6828TUT+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:
- 3.08V, 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
MAX6828TUT+T FAQ
1.How can I place an order for MAX6828TUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6828TUT+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 MAX6828TUT+T reliable?
The price and inventory of MAX6828TUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6828TUT+T is usually 5 days.
3.What payment methods are accepted for MAX6828TUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6828TUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6828TUT+T?
MAX6828TUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6828TUT+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 MAX6828TUT+T?
For technical support, including MAX6828TUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6828TUT+T requirements.
6.How does Aetrix verify that MAX6828TUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6828TUT+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 MAX6828TUT+T meets industry standards.
7.What is the process for return or replacement of MAX6828TUT+T?
All MAX6828TUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6828TUT+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 MAX6828TUT+T part is unused and in its original packaging.
Return procedure for MAX6828TUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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