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Analog Devices Inc./Maxim Integrated MAX6829ZWUT+
- Part No.:
- MAX6829ZWUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6829ZWUT+.pdf
- Description:
- MAX6829 DUAL ULTRA-LOW-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:5,906
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Product details
Overview
MAX6829ZWUT+ from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring primary supply (VCC) at 2.32V and secondary supply (VCC2) at 2.313V with 140ms minimum reset timeout, manual reset input (MR), and watchdog timer (WDI). It asserts active-low open-drain RESET during brownout, power-up, or watchdog timeout, and is used in battery-powered embedded systems requiring reliable dual-rail monitoring.
For engineers reviewing the MAX6829ZWUT+ datasheet, MAX6829ZWUT+ pinout, MAX6829ZWUT+ application, or MAX6829ZWUT+ equivalent, this page delivers verified electrical thresholds, SOT23-6 terminal mapping, watchdog timing behavior, reset assertion logic under VCC/VCC2 fault conditions, and validated alternative parts for multivoltage µP supervision.
Technical Context
The MAX6829ZWUT+ integrates two independent voltage comparators-one factory-trimmed for VCC2 at 2.313V (Z suffix), one for VCC at 2.32V-with a shared 140ms reset timeout delay generator and a 1.6s watchdog timer cleared by WDI edges. Its open-drain RESET output supports bidirectional µP reset I/O interfaces without external pull-up dependency for assertion.
It operates down to VCC = +1.0V with guaranteed reset validity, features internal 50kΩ MR pull-up, and rejects short negative VCC transients (<20µs at 100mV overdrive). The device uses BiCMOS process (750 transistors) and requires no external components for basic supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.32V (factory-trimmed, Z suffix); ensures reliable reset assertion when main supply drops below nominal 2.5V rail. |
| VCC2 Reset Threshold | 2.313V (factory-trimmed, Z suffix); monitors secondary supply such as I/O voltage in 2.5V/1.8V systems. |
| Reset Timeout Period | 140ms min; holds RESET asserted long enough to fully reset microcontrollers after supply recovery. |
| Watchdog Timeout Period | 1.6s nominal; detects µP lockup if WDI is not toggled within this window, triggering system reset. |
| Operating Voltage Range | +1.0V to +5.5V; guarantees functional reset behavior even during deep brownout down to 1.0V VCC. |
| RESET Output Type | Active-low open-drain; enables wired-OR configuration and direct interface with bidirectional µP reset pins. |
| Supply Current (ICC) | 30µA max at -40°C to +125°C; supports ultra-low-power operation in portable and battery-critical designs. |
Pinout & Package
MAX6829ZWUT+ is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, surface-mount, lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks current when asserted; requires external pull-up for high state. |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O; must be low-impedance connection. |
| 3 | MR | Manual reset input (active-low); internally pulled up to VCC (50kΩ); initiates reset when pulled to GND. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears 1.6s timer on transition; disabled if left floating. |
| 5 | VCC2 | Secondary supply monitor input; factory-trimmed comparator threshold = 2.313V; connects directly to 2.5V or 1.8V rail. |
| 6 | VCC | Primary supply monitor input; factory-trimmed comparator threshold = 2.32V; powers internal circuitry and references MR/WDI. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (2.32V) and VCC2 (2.313V) with separate comparators-no shared threshold error coupling. |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset assertion even during severe brownout, eliminating need for external voltage translators. |
| No external components required | Integrates pull-up on MR, precision thresholds, timeout generator, and watchdog-reduces BOM count and PCB area. |
| Immunity to short negative VCC transients | Withstands ≤20µs glitches at 100mV below threshold without spurious reset-critical for noisy automotive or industrial rails. |
| Open-drain RESET for bidirectional µP compatibility | Directly interfaces with Motorola 68HC11 and similar µPs having bidirectional reset I/O using single pull-up resistor. |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
|
Use Scenario: Handheld medical devices powered by single-cell Li-ion (3.0–4.2V) with 2.5V I/O rail and real-time firmware safety checks. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RESET during battery sag or I/O rail collapse, with 1.6s watchdog guarding against firmware hang. Use Value: Prevents corrupted memory writes and sensor misreads by enforcing full µP reset before resuming operation-no external RC network needed. |
Use Scenario: Industrial PLC modules with isolated 3.3V core and 2.5V communication interface, operating across -40°C to +125°C. IC Role / Device Role / Timing Role: Monitors both rails independently; asserts RESET if either falls below 2.32V/2.313V; maintains reset for ≥140ms after recovery. Use Value: Eliminates need for discrete comparators and timers-reduces design cycle time and improves thermal stability of reset timing over temperature. |
| Intelligent Instruments | Automotive Systems |
|
Use Scenario: Portable oscilloscope with FPGA-based signal processing, 1.8V core, and 3.3V analog front-end, requiring deterministic boot sequence. IC Role / Device Role / Timing Role: Uses VCC2 pin to monitor 3.3V analog supply; VCC pin for 1.8V FPGA rail; MR for front-panel reset button. Use Value: Ensures analog subsystem powers up before digital logic-prevents ADC initialization errors and signal path corruption. |
Use Scenario: Body control module with 5V microcontroller and 2.5V CAN transceiver supply, exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises 2.32V VCC threshold on 5V rail and 2.313V VCC2 on 2.5V CAN rail; immune to <20µs negative transients. Use Value: Avoids false resets during engine cranking while guaranteeing reset during sustained undervoltage-meets ISO 7637-2 pulse 4 immunity requirements. |
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 |
|---|---|---|---|
| MAX6830ZWUT+ | Active-high push-pull RESET output (vs. open-drain); identical VCC/VCC2 thresholds and timing. | Requires no external pull-up; incompatible with bidirectional µP reset pins needing open-drain drive. | Select when interfacing with µPs lacking internal pull-up or requiring active-high reset assertion logic. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no VCC2 monitor; 200ms fixed timeout; no watchdog input. | Lacks dual-rail monitoring and watchdog functionality-suitable only for simpler single-rail systems. | Choose only if system has one critical supply and no firmware execution monitoring requirement. |
Compared with MAX6829ZWUT+, MAX6830ZWUT+ offers push-pull reset convenience but sacrifices bidirectional µP compatibility, while TPS3808G33DBVR reduces cost and complexity at the expense of dual-supply supervision and watchdog safety coverage.
Availability
MAX6829ZWUT+ 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 (-40°C to +125°C) and long-term production continuity.
Supply support for MAX6829ZWUT+ 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, and communications applications.
The MAX6826–MAX6831 family was designed specifically for ultra-low-voltage dual-rail microprocessor supervision in space-constrained, battery-sensitive systems-emphasizing guaranteed operation down to 1.0V VCC and integrated watchdog safety.
FAQ
What is the exact reset threshold voltage for VCC and VCC2 on MAX6829ZWUT+?
The MAX6829ZWUT+ has factory-trimmed reset thresholds: VCC threshold is 2.32V (Z suffix), and VCC2 threshold is 2.313V (Z suffix), both specified over -40°C to +125°C. These values are laser-trimmed during production and do not require external calibration-ensuring consistent dual-rail supervision without resistor dividers.
Does MAX6829ZWUT+ support bidirectional microprocessor reset pins?
Yes, MAX6829ZWUT+ supports bidirectional µP reset pins via its active-low open-drain RESET output. When interfaced with µPs like the Motorola 68HC11, a single external pull-up resistor enables the µP to drive the line low during its own reset sequence while MAX6829ZWUT+ asserts reset during supply faults-no level-shifting or additional logic required.
How does the watchdog timer in MAX6829ZWUT+ behave during power-up?
During power-up, the MAX6829ZWUT+ watchdog timer remains inactive until VCC exceeds its 2.32V threshold and stabilizes. Once enabled, it begins counting from zero and triggers reset if WDI is not toggled within 1.6s. The timer is cleared automatically by any MR assertion or RESET event-ensuring no spurious timeout during boot.
Can MAX6829ZWUT+ monitor a 1.8V supply as VCC2?
No-MAX6829ZWUT+ is factory-configured for VCC2 = 2.313V (Z suffix). To monitor 1.8V, select MAX6829YHUT+ (VCC2 = 2.188V) or MAX6829WIUT+ (VCC2 = 1.665V). The Z-suffix variant's 2.313V threshold is optimized for 2.5V rails; using it on 1.8V would prevent valid reset assertion during undervoltage.
What is the minimum VCC voltage at which MAX6829ZWUT+ guarantees correct reset operation?
MAX6829ZWUT+ guarantees correct reset assertion and timing behavior down to VCC = +1.0V across -40°C to +125°C. This is validated in the Absolute Maximum Ratings and Electrical Characteristics tables-enabling robust operation during deep brownout conditions where other supervisors fail silently.
MAX6829ZWUT+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.665V, 2.32V
- 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
MAX6829ZWUT+ FAQ
1.How can I place an order for MAX6829ZWUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6829ZWUT+ 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 MAX6829ZWUT+ reliable?
The price and inventory of MAX6829ZWUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6829ZWUT+ is usually 5 days.
3.What payment methods are accepted for MAX6829ZWUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6829ZWUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6829ZWUT+?
MAX6829ZWUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6829ZWUT+ 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 MAX6829ZWUT+?
For technical support, including MAX6829ZWUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6829ZWUT+ requirements.
6.How does Aetrix verify that MAX6829ZWUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6829ZWUT+ 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 MAX6829ZWUT+ meets industry standards.
7.What is the process for return or replacement of MAX6829ZWUT+?
All MAX6829ZWUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6829ZWUT+, 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 MAX6829ZWUT+ part is unused and in its original packaging.
Return procedure for MAX6829ZWUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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