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Analog Devices Inc./Maxim Integrated MAX6829WIUT+
- Part No.:
- MAX6829WIUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6829WIUT+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:868
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Product details
Overview
MAX6829WIUT+ from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in 6-pin SOT23 package, designed to monitor primary supply (VCC) and secondary supply (VCC2) with factory-trimmed thresholds. It provides active-low push-pull RESET output, manual reset input (MR), watchdog timer (1.6s timeout), and guaranteed reset validity down to VCC = +1.0V. Used in portable battery-powered equipment for reliable power-up/brownout detection.
For engineers reviewing the MAX6829WIUT+ datasheet, MAX6829WIUT+ pinout, MAX6829WIUT+ application, or MAX6829WIUT+ equivalent, key selection considerations include its fixed +1.665V VCC2 threshold (W suffix), +1.67V VCC threshold (W suffix), 140ms minimum reset timeout, immunity to short negative VCC transients, and compatibility with multivoltage systems requiring dual-supply monitoring.
Technical Context
The MAX6829WIUT+ integrates two independent voltage monitors: one for VCC (programmable via W-suffix = +1.67V nominal) and one for VCC2 (factory-trimmed at +1.665V). Its internal watchdog timer triggers reset if WDI remains static beyond 1.6s, and MR asserts reset on active-low logic with internal 50kΩ pullup.
Reset assertion occurs when VCC falls below +1.67V, VCC2 falls below +1.665V, MR is pulled low, or WDI timeout expires. RESET remains asserted for ≥140ms after all conditions clear, with propagation delays under 20µs for VCC and 15µs for RESET IN events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | +1.67V (W suffix), guaranteed over -40°C to +125°C; ensures reliable reset during 1.8V/1.5V system brownouts |
| VCC2 Threshold | +1.665V (W suffix), factory-trimmed; enables precise monitoring of secondary core or I/O rails without external resistors |
| Reset Timeout Period | 140ms minimum; provides sufficient hold time for µP initialization sequences before release |
| Watchdog Timeout | 1.6s nominal; detects firmware hangs in deeply embedded applications with minimal software overhead |
| Operating Voltage Range | VCC = +1.53V to +2.0V; supports modern low-power microcontrollers and SoCs operating at sub-1.8V rails |
| RESET Output Type | Active-low push-pull; drives reset line directly without external pullup, compatible with standard µP reset inputs |
| Supply Current | 25µA max at -40°C to +125°C (VCC = +1.8V); enables multi-year battery life in portable instrumentation |
Pinout & Package
MAX6829WIUT+ uses a 6-pin SOT23 package (U6+1 outline, land pattern 90-0175), RoHS-compliant with lead-free plating (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low during fault conditions and holds for ≥140ms post-recovery |
| 2 | GND | Ground reference for all internal comparators and logic; must be connected to system ground plane |
| 3 | MR | Manual reset input, active-low with internal 50kΩ pullup to VCC; momentary GND connection forces system reset |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset; unconnected or three-stated disables watchdog function |
| 5 | VCC2 | Secondary supply input; monitored against fixed +1.665V threshold; no external components required |
| 6 | VCC | Primary supply input; monitored against +1.67V threshold; powers internal circuitry and defines logic levels |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (+1.67V) and VCC2 (+1.665V) with separate comparators and hysteresis |
| No external components required | Factory-trimmed thresholds eliminate resistor dividers, reducing BOM count and layout area in space-constrained designs |
| Guaranteed operation down to VCC = +1.0V | Ensures valid reset assertion even during deep brownout conditions where other supervisors fail |
| Immunity to short negative VCC transients | Withstands ≤20µs glitches down to 100mV below threshold without spurious reset, improving noise robustness |
| 1.6s watchdog timer with edge-sensitive clear | Resets on any WDI rising/falling edge, enabling flexible software heartbeat placement without strict timing windows |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Handheld medical meters powered by single-cell Li-ion batteries experiencing voltage sag during peak current draw. IC Role / Device Role / Timing Role: Dual-supply supervisor monitoring main rail (VCC) and sensor bias rail (VCC2) to prevent firmware corruption during transient brownouts. Use Value: Prevents data loss and unsafe operation by asserting reset before µP executes invalid instructions due to undervoltage. |
Use Scenario: Industrial PLC modules with isolated 3.3V logic and 2.5V I/O supplies subject to load switching noise. IC Role / Device Role / Timing Role: Monitors both rails independently and coordinates reset timing to ensure synchronized recovery across subsystems. Use Value: Eliminates race conditions during power restoration by holding reset until both supplies stabilize above thresholds. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable oscilloscope with FPGA-based signal processing and analog front-end powered from split 1.8V/3.3V regulators. IC Role / Device Role / Timing Role: Supervises FPGA core voltage (VCC2) and I/O voltage (VCC) with matched thresholds to prevent partial configuration errors. Use Value: Ensures FPGA configures fully before releasing reset, avoiding metastability in high-speed ADC interfaces. |
Use Scenario: Automotive body control module where µP must remain in reset until all safety-critical rails exceed specification. IC Role / Device Role / Timing Role: Provides deterministic reset hold time (≥140ms) and watchdog supervision to meet ASIL-B functional safety requirements. Use Value: Guarantees µP starts only when both primary and secondary supplies are stable, preventing undefined state entry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830WIUT+ | Active-high push-pull RESET output instead of active-low; identical VCC/VCC2 thresholds and timing | Required when host µP expects active-high reset assertion (e.g., certain ARM Cortex-M variants) | Select MAX6830WIUT+ only if system reset logic is active-high; otherwise MAX6829WIUT+ maintains direct compatibility |
| MAX6829TIUT+ | Same functionality but T-suffix VCC threshold (+3.08V) instead of W-suffix (+1.67V); VCC2 threshold unchanged at +1.665V | Suitable for systems with higher primary supply (e.g., 3.3V I/O rail) while retaining low-voltage secondary monitoring | Choose MAX6829TIUT+ when VCC exceeds +2.0V; MAX6829WIUT+ is optimal for sub-2.0V primary rails like 1.8V or 1.5V cores |
Compared with MAX6830WIUT+, MAX6829WIUT+ provides active-low reset polarity essential for legacy µPs and simplifies interface design. Against MAX6829TIUT+, it offers tighter VCC threshold alignment with low-voltage cores, reducing risk of premature reset release during 1.8V rail ramp-up.
Availability
MAX6829WIUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, critical µP monitoring, and multivoltage systems requiring stable component supply across industrial temperature ranges.
Supply support for MAX6829WIUT+ 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 interface applications, with focus on high-reliability industrial and automotive markets.
The MAX6826–MAX6831 family was developed specifically for dual-rail microprocessor supervision in space-constrained, low-power systems-enabling reliable startup, brownout protection, and firmware watchdog coverage in a single 6-pin SOT23 device.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6829WIUT+?
The MAX6829WIUT+ has a factory-trimmed VCC2 reset threshold of +1.665V (typical) over -40°C to +125°C, with min/max limits of +1.611V/+1.719V at full temperature range. This value is fixed and does not require external resistor networks, making it ideal for monitoring secondary rails such as 1.8V or 1.5V supplies in portable systems where board space is limited.
Does MAX6829WIUT+ support operation at VCC = +1.2V?
Yes, MAX6829WIUT+ is specified to operate with VCC as low as +1.53V (minimum for W-suffix devices), and its reset output remains valid down to VCC = +1.0V. At +1.2V, the device functions correctly but operates outside its guaranteed parametric range; for production designs, VCC must be maintained ≥+1.53V to ensure compliance with datasheet specifications including reset threshold accuracy and timeout timing.
How does the watchdog timer in MAX6829WIUT+ interact with the manual reset input?
In MAX6829WIUT+, asserting MR low clears the watchdog timer and forces reset assertion for the full timeout period (≥140ms), regardless of WDI state. The timer resumes counting only after MR returns high and reset deasserts. This behavior ensures that manual reset takes precedence over watchdog monitoring, allowing technicians to recover hung systems without waiting for watchdog expiration.
Can MAX6829WIUT+ monitor a 2.5V VCC2 supply?
No, MAX6829WIUT+ is factory-trimmed for VCC2 = +1.665V and cannot reliably monitor 2.5V supplies. For 2.5V secondary rails, select MAX6829ZIUT+ (VCC2 = +2.313V) or MAX6829YIUT+ (VCC2 = +2.188V). Using MAX6829WIUT+ on 2.5V would result in immediate, continuous reset assertion since the input exceeds the +1.665V threshold by >480mV.
What is the maximum allowable leakage current on the WDI pin of MAX6829WIUT+?
The WDI pin of MAX6829WIUT+ allows up to ±100nA input current over -40°C to +125°C. When WDI is left unconnected or driven by a three-state buffer, the internal watchdog driver imposes a maximum load capacitance limit of 200pF and requires leakage ≤10µA to prevent false timeouts. Exceeding these values risks watchdog disablement or erratic reset behavior.
MAX6829WIUT+ 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:
- 1.388V, 1.67V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6829WIUT+ FAQ
1.How can I place an order for MAX6829WIUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6829WIUT+ 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 MAX6829WIUT+ reliable?
The price and inventory of MAX6829WIUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6829WIUT+ is usually 5 days.
3.What payment methods are accepted for MAX6829WIUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6829WIUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6829WIUT+?
MAX6829WIUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6829WIUT+ 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 MAX6829WIUT+?
For technical support, including MAX6829WIUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6829WIUT+ requirements.
6.How does Aetrix verify that MAX6829WIUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6829WIUT+ 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 MAX6829WIUT+ meets industry standards.
7.What is the process for return or replacement of MAX6829WIUT+?
All MAX6829WIUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6829WIUT+, 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 MAX6829WIUT+ part is unused and in its original packaging.
Return procedure for MAX6829WIUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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