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Analog Devices Inc./Maxim Integrated MAX6829RHUT+
- Part No.:
- MAX6829RHUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6829RHUT+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:628
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Product details
Overview
MAX6829RHUT+ 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 (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, and watchdog protection.
For engineers reviewing the MAX6829RHUT+ datasheet, MAX6829RHUT+ pinout, MAX6829RHUT+ application, or MAX6829RHUT+ equivalent, key selection considerations include its fixed VCC2 monitoring capability (e.g., +2.313V threshold for 'Z' suffix), push-pull RESET output, -40°C to +125°C operating range, and compatibility with multivoltage systems requiring dual-supply supervision without external components.
Technical Context
The MAX6829RHUT+ integrates two independent voltage monitors: one for VCC (programmable via suffix; 'R' = 2.63V nominal) and one factory-trimmed for VCC2 ('H' = 1.313V nominal at -40°C to +125°C). Its internal watchdog timer triggers reset if WDI remains static beyond 1.6s (min 0.8s, max 2.6s over temperature), and MR input features internal 50kΩ pullup.
Reset assertion occurs when VCC falls below VTH, VCC2 falls below VTH2, or MR is pulled low; reset remains asserted for ≥140ms after all conditions clear. The device uses BiCMOS process (750 transistors), operates with no external components, and tolerates negative VCC transients ≤20µs at 100mV overdrive without spurious reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.63V (nominal), ±30mV tolerance over -40°C to +125°C - sets primary supply brownout detection point |
| VCC2 Reset Threshold | 1.313V (nominal), ±30mV tolerance over -40°C to +125°C - factory-trimmed secondary supply monitor |
| Reset Timeout Period | 140ms (min), 320ms (max) over temperature - ensures µP completes full reset sequence before release |
| Watchdog Timeout Period | 1.6s (typical), 0.8s–2.6s over temperature - detects µP lockup with configurable timing margin |
| Supply Current (VCC) | 25µA (max) at -40°C to +125°C, VCC = +3.6V - enables long battery life in portable applications |
| Operating Voltage Range | +1.2V to +5.5V (VCC), +0.9V to +2.5V (VCC2) - supports modern low-voltage SoCs and dual-rail systems |
| RESET Output Type | Active-low push-pull - drives reset line directly without external pullup; sinks 3.2mA at VCC ≥ 4.25V |
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 push-pull reset output; asserts low on VCC/VCC2 fault, MR low, or watchdog timeout |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O |
| 3 | MR | Manual-reset input (active-low); internal 50kΩ pullup to VCC; 1µs minimum pulse width |
| 4 | WDI | Watchdog input; toggling clears 1.6s timer; unconnected or three-stated disables watchdog |
| 5 | VCC2 | Secondary supply input; monitored against factory-trimmed 1.313V threshold |
| 6 | VCC | Primary supply input; monitored against 2.63V threshold ('R' suffix) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (2.63V) and VCC2 (1.313V) with separate thresholds and hysteresis |
| No external components required | Internal pullup on MR, factory-trimmed VCC2 threshold, and integrated watchdog eliminate discrete parts |
| Guaranteed reset validity to VCC = +1.0V | Ensures clean reset assertion even during deep brownout, critical for low-power shutdown sequences |
| Immunity to short negative VCC transients | Withstands ≤20µs glitches at 100mV below threshold without false reset - improves noise robustness |
| 140ms minimum reset timeout | Meets µP reset hold-time requirements across industrial temperature range without external RC timing |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
|
Use Scenario: Battery-operated handheld medical device with dual-core MCU running at 1.8V I/O and 1.2V core. IC Role / Device Role / Timing Role: Supervises both 1.8V I/O rail (VCC) and 1.2V core rail (VCC2) to prevent erratic operation during battery sag. Use Value: Prevents data corruption by asserting reset before voltage drops below µP operational limits, using factory-trimmed thresholds eliminating calibration overhead. |
Use Scenario: Industrial PLC controller with ARM Cortex-M4, requiring fail-safe startup and runtime watchdog. IC Role / Device Role / Timing Role: Provides deterministic reset timing and watchdog supervision independent of software stack. Use Value: Guarantees reset assertion within 20µs of VCC drop (tRD), and maintains reset for ≥140ms (tRP) to satisfy ARM reset hold-time spec. |
| Intelligent Instruments | Critical µP Monitoring |
|
Use Scenario: Portable oscilloscope with FPGA, ADC, and precision analog front-end powered from multiple rails. IC Role / Device Role / Timing Role: Monitors 3.3V analog supply (VCC) and 1.2V FPGA core supply (VCC2) to coordinate power sequencing. Use Value: Eliminates need for discrete voltage detectors and RC timers, reducing BOM count and PCB area in space-constrained enclosures. |
Use Scenario: Avionics sensor node where µP must never execute invalid code due to undervoltage. IC Role / Device Role / Timing Role: Acts as hardware-enforced safety layer, asserting reset before VCC reaches 1.0V - the minimum guaranteed functional voltage. Use Value: Meets DO-254 functional safety requirements by providing deterministic, temperature-stable reset behavior across -40°C to +125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply µP supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830RHUT+ | Active-high push-pull RESET output; identical VCC/VCC2 thresholds and watchdog specs | Required when host µP expects active-high reset assertion (e.g., certain TI C2000 series) | Select MAX6830RHUT+ only if system-level reset logic requires high-true signaling; otherwise MAX6829RHUT+ is direct functional match. |
| TPS3808G33DBVR | Single-supply supervisor (monitors only VCC); 3.3V fixed threshold; no VCC2 input or watchdog input | Lacks dual-rail monitoring and watchdog - suitable only for simpler single-rail systems | Choose TPS3808G33DBVR only for cost-sensitive, single-rail designs where VCC2 supervision and watchdog are unnecessary. |
Compared with MAX6830RHUT+, MAX6829RHUT+ provides active-low reset polarity essential for most legacy µPs, while TPS3808G33DBVR omits VCC2 monitoring and watchdog - making MAX6829RHUT+ the only option meeting full dual-supply, watchdog-enabled supervision requirements.
Availability
MAX6829RHUT+ 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 and long production lifecycles.
Supply support for MAX6829RHUT+ 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 dual-rail µP supervision in space-constrained, battery-sensitive systems - delivering factory-trimmed accuracy, ultra-low quiescent current, and integrated watchdog functionality in SOT23.
FAQ
What is the VCC2 reset threshold voltage for MAX6829RHUT+?
The MAX6829RHUT+ has a factory-trimmed VCC2 reset threshold of 1.313V (nominal), with ±30mV tolerance over the full -40°C to +125°C operating range. This value corresponds to the 'H' suffix in the part number and is specified in the Electrical Characteristics table under VTH2 for 'H' grade. The threshold is internally trimmed and requires no external calibration.
Does MAX6829RHUT+ support watchdog functionality, and what is its timeout period?
Yes, MAX6829RHUT+ includes a fully integrated watchdog timer with a nominal timeout period of 1.6s. Over temperature (-40°C to +125°C), the timeout ranges from 0.8s (min) to 2.6s (max). The watchdog is cleared by any edge (rising or falling) on the WDI pin; leaving WDI unconnected or three-stated disables the function. The timer starts counting only after RESET is released.
What is the reset output type of MAX6829RHUT+, and how does it interface with a microprocessor?
MAX6829RHUT+ features an active-low push-pull RESET output. It drives the reset line low during fault conditions and actively pulls it high when released - requiring no external pullup resistor. This output directly interfaces with standard µP reset inputs expecting active-low assertion, such as those found in ARM Cortex-M, Renesas RX, and many legacy 8-bit MCUs.
Can MAX6829RHUT+ monitor both VCC and VCC2 simultaneously, and what are their respective voltage ranges?
Yes, MAX6829RHUT+ monitors VCC and VCC2 simultaneously and independently. VCC is monitored against a 2.63V threshold ('R' suffix) across +1.2V to +5.5V operating range. VCC2 is monitored against a factory-trimmed 1.313V threshold across +0.9V to +2.5V. Both monitors operate concurrently, and reset asserts if either supply violates its threshold.
What is the minimum VCC voltage at which MAX6829RHUT+ guarantees valid reset operation?
MAX6829RHUT+ guarantees valid reset assertion and release down to VCC = +1.0V, as explicitly stated in the General Description and Absolute Maximum Ratings. This ensures reliable operation during deep brownout conditions where other supervisors may fail, making it suitable for ultra-low-power and battery-depleted scenarios.
MAX6829RHUT+ 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:
- 1.313V, 2.63V
- 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
MAX6829RHUT+ FAQ
1.How can I place an order for MAX6829RHUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6829RHUT+ 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 MAX6829RHUT+ reliable?
The price and inventory of MAX6829RHUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6829RHUT+ is usually 5 days.
3.What payment methods are accepted for MAX6829RHUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6829RHUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6829RHUT+?
MAX6829RHUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6829RHUT+ 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 MAX6829RHUT+?
For technical support, including MAX6829RHUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6829RHUT+ requirements.
6.How does Aetrix verify that MAX6829RHUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6829RHUT+ 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 MAX6829RHUT+ meets industry standards.
7.What is the process for return or replacement of MAX6829RHUT+?
All MAX6829RHUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6829RHUT+, 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 MAX6829RHUT+ part is unused and in its original packaging.
Return procedure for MAX6829RHUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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