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Analog Devices Inc./Maxim Integrated MAX6829TIUT+
- Part No.:
- MAX6829TIUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6829TIUT+.pdf
- Description:
- MAX6829 DUAL ULTRA-LOW-VOLTAGE M
- Quantity:
- Payment:
- Shipping:
Inventory:11,662
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Product details
Overview
MAX6829TIUT+ 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 active-low open-drain RESET during brownout, power-up, or watchdog timeout in portable battery-powered systems.
For engineers reviewing the MAX6829TIUT+ datasheet, MAX6829TIUT+ pinout, MAX6829TIUT+ application, or MAX6829TIUT+ equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed dual-supply monitoring capability, and real-world design implications for multivoltage embedded controllers and critical µP monitoring applications.
Technical Context
The MAX6829TIUT+ integrates two independent voltage monitors: one for VCC (programmable threshold from 1.05V to 4.78V per suffix), and a factory-trimmed comparator for VCC2 (0.788V–2.388V depending on suffix). Its internal 1.6s watchdog timer clears on WDI edge transitions and triggers reset if no activity occurs within timeout.
Reset assertion is controlled by OR logic 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 pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Monitoring Range | +1.0V to +5.5V - guarantees valid reset operation even as primary supply drops to 1.0V, enabling robust brownout detection in low-power systems. |
| VCC2 Threshold | +0.788V (suffix D) - factory-trimmed fixed threshold for secondary supply monitoring, eliminating need for external resistor divider. |
| Reset Timeout Delay | 140ms (min) - ensures µP completes full initialization before release, preventing premature code execution. |
| Watchdog Timeout | 1.6s (nominal) - provides deterministic software execution supervision without requiring precise timing calibration. |
| RESET Output Type | Open-drain - enables wired-OR configuration and direct interface with bidirectional µP reset I/O (e.g., Motorola 68HC11). |
| Supply Current | 30µA (max at -40°C to +125°C, VCC = +3.6V) - ultra-low quiescent current suitable for always-on battery-backed monitoring. |
| Operating Temp | -40°C to +125°C - qualified for automotive and industrial environments where thermal stability is critical. |
Pinout & Package
MAX6829TIUT+ uses a 6-pin SOT23-6 package with exposed pad (not electrically connected), footprint-compatible with JEDEC MO-178AA. Pin 1 is marked with dot; device orientation follows standard SOT23 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup; sinks ≥1.2mA at VCC ≥ 2.55V for reliable µP reset assertion. |
| 2 | GND | Ground reference for all internal comparators and logic; must be low-impedance connection to system ground plane. |
| 3 | MR | Manual reset input (active-low); internally pulled up to VCC via 50kΩ resistor; accepts CMOS or open-drain logic levels. |
| 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., core voltage); factory-trimmed comparator threshold applies. |
| 6 | VCC | Primary supply input; powers internal circuitry and sets operating voltage range; reset valid down to +1.0V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC (1.05V–4.78V) and VCC2 (0.788V–2.388V) supervision eliminates need for discrete supervisors in multirail systems. |
| Factory-trimmed VCC2 threshold | Removes external resistor divider and associated tolerance stack-up, improving accuracy and reducing BOM count for secondary rail monitoring. |
| 1.6s watchdog timer with edge-triggered clear | Enables flexible software supervision-toggling WDI at any point resets timer, avoiding stuck-loop false negatives. |
| Open-drain RESET output | Supports shared reset bus architectures and interfaces directly with bidirectional µP reset pins without level-shifting. |
| Guaranteed operation down to VCC = +1.0V | Ensures deterministic reset behavior during deep brownout, critical for data integrity in nonvolatile memory systems. |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Smart sensor node powered by single-cell Li-ion battery with separate 1.8V I/O and 1.2V core rails. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RESET to ARM Cortex-M0+ during VCC2 (core) brownout or VCC (I/O) sag below 1.8V. Use Value: Prevents corrupted flash writes by holding µP in reset until both rails stabilize above factory-trimmed thresholds (1.575V for VCC, 1.110V for VCC2). |
Use Scenario: Industrial PLC controller with isolated 3.3V communication interface and 2.5V FPGA configuration rail. IC Role / Device Role / Timing Role: Monitors 3.3V VCC and 2.5V VCC2 simultaneously; asserts RESET if either falls below 3.08V or 2.188V respectively. Use Value: Eliminates risk of FPGA misconfiguration due to partial power loss-guarantees 140ms reset hold time after recovery for safe reinitialization. |
| Automotive Systems | Critical µP Monitoring |
Use Scenario: Body control module with 5V MCU supply and 3.3V CAN transceiver rail operating in -40°C to +125°C ambient. IC Role / Device Role / Timing Role: Supervises VCC (5V) and VCC2 (3.3V) with L-suffix (4.63V/2.313V thresholds); operates across full automotive temperature range. Use Value: Immunity to short negative VCC transients (<20µs at 100mV overdrive) prevents spurious resets during load-dump events. |
Use Scenario: Medical infusion pump requiring fail-safe µP restart upon firmware hang or power anomaly. IC Role / Device Role / Timing Role: Uses WDI to monitor main loop execution; triggers 140ms RESET pulse if watchdog timer expires due to software lockup. Use Value: 1.6s watchdog timeout provides sufficient margin for complex safety routines while ensuring rapid recovery from hangs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830TIUT+ | Active-high push-pull RESET output instead of open-drain; identical VCC/VCC2 monitoring and watchdog functionality. | Requires no external pullup; incompatible with bidirectional µP reset pins that expect open-drain drive. | Select MAX6830TIUT+ when interfacing with µPs having dedicated active-high reset inputs and board space is constrained. |
| TPS3808G18DBVR | Single-supply supervisor (monitors only VCC); 1.8V fixed threshold; 200ms reset timeout; push-pull RESET; no watchdog or VCC2 input. | Lacks dual-rail monitoring and watchdog capability; suitable only for basic single-rail systems without software supervision needs. | Choose TPS3808G18DBVR for cost-sensitive, single-rail applications where watchdog and secondary supply monitoring are unnecessary. |
Compared with MAX6829TIUT+, MAX6830TIUT+ simplifies reset net routing but sacrifices bidirectional interface flexibility, while TPS3808G18DBVR reduces feature set and cost but cannot replace dual-monitoring or watchdog requirements in the original design.
Availability
MAX6829TIUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and automotive systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6829TIUT+ 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 multivoltage microprocessor systems needing simultaneous primary/secondary supply monitoring, manual reset, and watchdog supervision in space-constrained SOT23 packages.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6829TIUT+?
The MAX6829TIUT+ uses the 'D' threshold suffix per its ordering code (TIUT+ maps to VCC2 = 0.788V). This is a factory-trimmed value with min/typ/max of 0.761V/0.788V/0.815V across -40°C to +125°C. It does not require external components and is optimized for monitoring 0.9V–2.5V secondary supplies.
Does MAX6829TIUT+ support bidirectional microprocessor reset pins?
Yes, MAX6829TIUT+ supports bidirectional µP reset pins via its open-drain RESET output. When paired with an external pullup resistor, it can both assert reset (by pulling low) and release reset (by going high-impedance), matching the behavior required by processors like the Motorola 68HC11.
How is the watchdog timer cleared on MAX6829TIUT+?
The MAX6829TIUT+ watchdog timer is cleared on any rising or falling edge at the WDI pin. It does not require specific pulse polarity or width-transitions as short as 50ns suffice. The timer also clears automatically during reset assertion or manual reset activation.
Can MAX6829TIUT+ monitor a 1.2V supply as VCC2?
Yes, MAX6829TIUT+ can monitor a 1.2V supply as VCC2 using the 'H' suffix variant (1.313V threshold) or 'G' suffix (1.110V threshold). The TIUT+ suffix corresponds to 'D' (0.788V), so for 1.2V monitoring, a different suffix (e.g., MAX6829HIUT+) would be required-TIUT+ itself is not rated for 1.2V VCC2 supervision.
What is the minimum VCC voltage at which MAX6829TIUT+ guarantees valid reset operation?
MAX6829TIUT+ guarantees valid reset operation down to VCC = +1.0V across the full -40°C to +125°C temperature range. Below this, reset behavior is not specified; the device ensures correct state retention and deterministic reset assertion even during deep brownout conditions.
MAX6829TIUT+ 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:
- 1.388V, 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
MAX6829TIUT+ FAQ
1.How can I place an order for MAX6829TIUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6829TIUT+ 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 MAX6829TIUT+ reliable?
The price and inventory of MAX6829TIUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6829TIUT+ is usually 5 days.
3.What payment methods are accepted for MAX6829TIUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6829TIUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6829TIUT+?
MAX6829TIUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6829TIUT+ 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 MAX6829TIUT+?
For technical support, including MAX6829TIUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6829TIUT+ requirements.
6.How does Aetrix verify that MAX6829TIUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6829TIUT+ 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 MAX6829TIUT+ meets industry standards.
7.What is the process for return or replacement of MAX6829TIUT+?
All MAX6829TIUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6829TIUT+, 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 MAX6829TIUT+ part is unused and in its original packaging.
Return procedure for MAX6829TIUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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