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Analog Devices Inc./Maxim Integrated MAX6829TWUT
- Part No.:
- MAX6829TWUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6829TWUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,781
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Product details
Overview
MAX6829TWUT from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring primary supply (VCC) and factory-trimmed secondary supply (VCC2) down to +0.9V, with manual reset input, 1.6s watchdog timeout, and 140ms minimum reset timeout delay. It asserts an active-low open-drain RESET output and guarantees valid reset operation down to VCC = +1.0V - used in battery-powered embedded controllers requiring reliable brownout detection.
For engineers reviewing the MAX6829TWUT datasheet, MAX6829TWUT pinout, MAX6829TWUT application, or MAX6829TWUT equivalent, this page delivers verified functional identity, confirmed dual-supply monitoring thresholds, exact SOT23-6 pin mapping, real-world timing behavior (tRP ≥140ms, tWD = 1.6s), and validated alternative options for multivoltage µP reset supervision.
Technical Context
The MAX6829TWUT implements dual independent voltage monitoring: VCC (primary) with factory-set threshold (here "T" suffix = 3.08V nominal), and VCC2 (secondary) with fixed +0.9V to +2.5V range and factory-trimmed threshold (here "W" suffix = 1.665V nominal). Its internal watchdog timer triggers reset if WDI remains static >1.6s, and resets on any WDI edge.
Reset assertion is OR-combined across VCC undervoltage, VCC2 undervoltage, MR low, or watchdog timeout; reset remains asserted for ≥140ms after all conditions clear. The open-drain RESET output supports bidirectional µP reset pins and requires external pull-up, enabling flexible interface with MCUs like Motorola 68HC11.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 3.08V (nominal, T-suffix), ±3% over -40°C to +125°C - sets primary power-fail detection point for 3.3V systems |
| VCC2 Threshold | 1.665V (nominal, W-suffix), ±3% over -40°C to +125°C - factory-trimmed for accurate monitoring of 1.8V I/O or core rails |
| Reset Timeout (tRP) | 140ms (min), 320ms (max) - ensures µP completes full power stabilization before release |
| Watchdog Timeout (tWD) | 1.6s (nominal), 0.8–2.6s over temperature - provides robust software execution monitoring without excessive timeout risk |
| Operating Voltage Range | +1.2V to +5.5V (VCC), -40°C to +125°C - enables use in ultra-low-power battery systems and industrial environments |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration, level translation, and direct interface with bidirectional MCU reset pins |
| Supply Current (ICC) | 30µA max at -40°C to +125°C (VCC = +3.6V) - minimizes quiescent load in always-on supervision paths |
Pinout & Package
Package: 6-pin SOT23-6, surface-mount, lead-free compatible (UT-T suffix), 1.6mm × 2.9mm footprint, 1.1mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - sinks current when asserted; requires external pull-up for logic-high state |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O - must be low-impedance connection to system ground plane |
| 3 | MR | Manual reset input, active-low, internally pulled up to VCC (50kΩ) - momentary GND switch initiates system reset without external components |
| 4 | WDI | Watchdog input - toggling within 1.6s prevents reset; left floating or three-stated disables watchdog function |
| 5 | VCC2 | Secondary supply input - connects directly to monitored rail (e.g., 1.8V I/O supply); threshold factory-trimmed to 1.665V |
| 6 | VCC | Primary supply input - powers device and sets main reset threshold (3.08V); valid operation guaranteed down to +1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | VCC (3.08V) and VCC2 (1.665V) thresholds operate simultaneously with no shared path - enables true multirail brownout detection |
| Guaranteed reset validity to VCC = +1.0V | Internal biasing remains functional below typical LDO dropout - ensures reset assertion even during deep brownout or battery sag |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - eliminates need for external RC filtering in noisy environments |
| No external components required | Internal 50kΩ MR pull-up, factory-trimmed thresholds, and self-contained watchdog eliminate resistors, capacitors, or trimming pots |
| 1.6s watchdog with edge-triggered clear | WDI rising/falling edge resets timer - supports robust software heartbeat without precise pulse timing or duty-cycle constraints |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Wearable health monitor powered by single-cell Li-ion (3.0–4.2V) with 1.8V sensor interface rail. IC Role / Device Role: Dual-rail supervisor asserting RESET if main VCC drops below 3.08V or sensor rail (VCC2) falls below 1.665V. Use Value: Prevents corrupted sensor data writes during battery sag by halting MCU before voltage crosses critical thresholds. |
Use Scenario: Industrial PLC module with isolated 3.3V logic and 2.5V FPGA configuration supply. IC Role / Device Role: Monitors both rails independently; open-drain RESET interfaces directly to FPGA's bidirectional INIT_B pin. Use Value: Ensures FPGA reconfiguration only occurs after both supplies stabilize - avoids partial configuration failure. |
| Intelligent Instruments | Automotive Systems |
Use Scenario: Handheld multimeter with 3.3V MCU and 1.2V ADC reference derived from LDO. IC Role / Device Role: VCC monitors 3.3V rail; VCC2 monitors 1.2V reference - triggers reset if either drops below spec. Use Value: Guarantees measurement accuracy by preventing ADC operation during unstable reference voltage. |
Use Scenario: Body control module with 5V microcontroller supply and 3.3V CAN transceiver supply. IC Role / Device Role: Supervises both rails; MR tied to ignition switch signal for cold-start reset initiation. Use Value: Synchronizes MCU and CAN transceiver startup - eliminates bus arbitration errors on power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830TWUT | Same pinout and thresholds (VCC=3.08V, VCC2=1.665V), but features active-high push-pull RESET output instead of open-drain | Requires no external pull-up; incompatible with bidirectional MCU reset pins needing open-drain drive | Select MAX6830TWUT only when interfacing with µPs having dedicated active-high reset inputs and no shared reset bus |
| TPS3808G33DBVR | Single-supply supervisor (VDD only), 3.3V threshold, 200ms reset timeout, no VCC2 monitor or watchdog input | Lacks secondary rail monitoring and watchdog functionality - cannot replace dual-monitoring requirement of MAX6829TWUT | Use only as partial substitute where only primary 3.3V supervision is needed and VCC2/watchdog are handled separately |
Compared with MAX6829TWUT, MAX6830TWUT offers identical monitoring but different reset polarity and drive strength, while TPS3808G33DBVR omits VCC2 supervision and watchdog - making MAX6829TWUT uniquely suited for compact dual-rail systems requiring open-drain flexibility and integrated watchdog.
Availability
MAX6829TWUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply across automotive (-40°C to +125°C) temperature range and long-term production continuity.
Supply support for MAX6829TWUT 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 simultaneous monitoring of primary and secondary rails with integrated watchdog and manual reset - targeting portable, automotive, and instrumentation markets.
FAQ
What is the exact VCC and VCC2 reset threshold voltage for MAX6829TWUT?
The MAX6829TWUT has a VCC reset threshold of 3.08V (T-suffix, ±3% over -40°C to +125°C) and a VCC2 reset threshold of 1.665V (W-suffix, ±3% over -40°C to +125°C). These values are factory-trimmed and specified in the Electrical Characteristics table of the MAX6829TWUT datasheet under "VCC Reset Threshold" and "VCC2 Reset Threshold" parameters.
Does MAX6829TWUT support bidirectional microcontroller reset pins?
Yes, MAX6829TWUT supports bidirectional µP reset pins via its active-low open-drain RESET output. When paired with an external pull-up resistor, it can both assert reset (by pulling low) and release reset (allowing the line to rise), matching the behavior required by MCUs such as the Motorola 68HC11 - a capability confirmed in the Applications Information section of the MAX6829TWUT datasheet.
What is the watchdog timeout period for MAX6829TWUT, and how is it cleared?
The MAX6829TWUT features a nominal 1.6s watchdog timeout period (0.8–2.6s over temperature), cleared by any rising or falling edge on the WDI pin. The internal timer also resets automatically during MR assertion or RESET assertion. Leaving WDI unconnected or three-stating it disables the watchdog function entirely - behavior documented in the Watchdog Input section of the MAX6829TWUT datasheet.
Can MAX6829TWUT operate reliably when VCC drops below 1.8V?
Yes, MAX6829TWUT is guaranteed to maintain valid reset assertion down to VCC = +1.0V, per Absolute Maximum Ratings and Electrical Characteristics tables. This ensures robust brownout detection even during severe battery discharge or LDO dropout - a key specification explicitly stated for the MAX6829TWUT in its datasheet's "Guaranteed Reset Valid Down to VCC = +1.0V" feature list.
What package type and footprint does MAX6829TWUT use?
MAX6829TWUT uses a 6-pin SOT23-6 package (package outline 21-0058), measuring 1.6mm × 2.9mm with 0.95mm pitch. It is lead-free compatible (UT-T suffix), RoHS-compliant, and designed for standard reflow soldering. The pin configuration and mechanical dimensions are fully detailed in the Package Information section of the MAX6829TWUT datasheet.
MAX6829TWUT 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:
- 1.665V, 3.08V
- 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-23-6
MAX6829TWUT FAQ
1.How can I place an order for MAX6829TWUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6829TWUT 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 MAX6829TWUT reliable?
The price and inventory of MAX6829TWUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6829TWUT is usually 5 days.
3.What payment methods are accepted for MAX6829TWUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6829TWUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6829TWUT?
MAX6829TWUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6829TWUT 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 MAX6829TWUT?
For technical support, including MAX6829TWUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6829TWUT requirements.
6.How does Aetrix verify that MAX6829TWUT is sourced from the original manufacturer or authorized distributors?
All MAX6829TWUT 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 MAX6829TWUT meets industry standards.
7.What is the process for return or replacement of MAX6829TWUT?
All MAX6829TWUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6829TWUT, 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 MAX6829TWUT part is unused and in its original packaging.
Return procedure for MAX6829TWUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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