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Analog Devices Inc./Maxim Integrated MAX6829SDUT+T
- Part No.:
- MAX6829SDUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6829SDUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,448
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Product details
Overview
MAX6829SDUT+T from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory IC in 6-pin SOT23 package, monitoring primary VCC (3.08V threshold) and secondary VCC2 (2.188V threshold), with manual reset input, 1.6s watchdog timeout, and active-low push-pull RESET output - used in battery-powered embedded systems requiring reliable power-up/brownout reset control.
For engineers reviewing the MAX6829SDUT+T datasheet, MAX6829SDUT+T pinout, MAX6829SDUT+T application, or MAX6829SDUT+T equivalent, key selection criteria include dual-supply monitoring range (+1.8V to +5.0V for VCC, +0.9V to +2.5V for VCC2), guaranteed reset validity down to VCC = +1.0V, 140ms minimum reset timeout, immunity to short negative VCC transients, and factory-trimmed VCC2 threshold without external components.
Technical Context
The MAX6829SDUT+T implements dual independent voltage monitoring: one factory-trimmed comparator for VCC2 (2.188V nominal at −40°C to +125°C) and one preprogrammed VCC threshold (3.08V, suffix 'S'). It integrates a 1.6s watchdog timer with edge-triggered clearing and a manual reset input with internal 50kΩ pullup.
Its reset logic asserts active-low RESET when VCC falls below 3.08V, VCC2 falls below 2.188V, MR is pulled low, or WDI fails to toggle within 1.6s; RESET remains asserted for ≥140ms after all conditions clear. The push-pull output drives high (≥0.8×VCC) when deasserted and low (≤0.3V at ISINK ≤ 1.2mA) when asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 3.08V (±3%, −40°C to +125°C); ensures reliable reset assertion during 3.3V system brownout |
| VCC2 Threshold | 2.188V (±3%, −40°C to +125°C); factory-trimmed for accurate monitoring of 2.5V/1.8V auxiliary rails |
| Reset Timeout Period | 140ms minimum; guarantees µP initialization completes before release |
| Watchdog Timeout | 1.6s nominal (0.8s–2.6s over temp); detects firmware hangs in real-time embedded control loops |
| Supply Current | 7µA typical at +3.6V, −40°C to +85°C; enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage Range | +1.2V to +5.5V (−40°C to +125°C); supports valid reset assertion even during deep brownout |
| RESET Output Type | Active-low push-pull; eliminates external pullup and interfaces directly with µP reset pins |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives low (≤0.3V) to assert reset; high (≥0.8×VCC) when released - no external pullup required |
| 2 - GND | Ground reference | Common return path for all internal comparators, timer, and output stage |
| 3 - MR | Manual reset input (active-low) | Internal 50kΩ pullup to VCC; momentary GND connection forces reset for ≥140ms |
| 4 - WDI | Watchdog input | Edge-sensitive; toggling within 1.6s prevents reset; unconnected disables watchdog |
| 5 - VCC2 | Secondary supply monitor input | Factory-trimmed 2.188V threshold input - connects directly to 2.5V/1.8V rail for dual-rail supervision |
| 6 - VCC | Primary supply monitor input | Preprogrammed 3.08V threshold input - monitors main 3.3V system rail |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises 3.3V main rail (VCC) and 2.5V/1.8V auxiliary rail (VCC2) with factory-trimmed thresholds |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset behavior during severe brownout - critical for automotive and industrial edge nodes |
| No external components required | Eliminates resistors, capacitors, and trimming - reduces BOM count and layout area in space-constrained SOT23 designs |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - improves noise resilience in noisy power environments |
| 1.6s watchdog with edge-triggered clear | Monitors µP software execution flow via rising/falling edges on WDI - prevents lockup without timing-critical pulse width constraints |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Coin-cell–powered wireless sensor node operating at 3.3V VCC and 1.8V VCC2, subject to battery voltage sag during RF transmission. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting active-low RESET during simultaneous VCC/VCC2 brownout, with 140ms hold time ensuring MCU full restart. Use Value: Prevents corrupted flash writes and state machine lockup by guaranteeing reset until both rails stabilize above 3.08V and 2.188V respectively. | Use Scenario: Industrial PLC controller with separate 3.3V I/O and 2.5V core supplies, requiring fail-safe startup sequencing. IC Role / Device Role / Timing Role: Primary VCC monitor (3.08V) and secondary VCC2 monitor (2.188V) integrated in single SOT23 footprint - replaces discrete supervisor pair. Use Value: Reduces PCB area by 50% vs. dual discrete supervisors while maintaining independent threshold accuracy and temperature stability. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Handheld multimeter with LCD backlight (3.3V) and analog front-end (2.5V), powered by rechargeable Li-ion. IC Role / Device Role / Timing Role: Monitors both rails for undervoltage; asserts RESET if either drops below threshold - prevents display corruption or ADC misreads. Use Value: Factory-trimmed VCC2 threshold eliminates calibration drift over temperature, ensuring consistent 2.5V rail supervision across −40°C to +125°C. | Use Scenario: Medical infusion pump MCU requiring guaranteed reset during AC/DC adapter dropout or battery switchover. IC Role / Device Role / Timing Role: Supervises primary 3.3V rail and backup 2.5V rail; uses MR for emergency hardware reset and WDI for firmware liveliness check. Use Value: 1.6s watchdog timeout aligns with safety-critical task cycle times, enabling automatic recovery from stuck states without operator intervention. |
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 |
|---|---|---|---|
| MAX6830SDUT+T | Active-high push-pull RESET output; identical VCC/VCC2 thresholds and timing | Required where host µP reset pin is active-high (e.g., certain ARM Cortex-M variants) | Select MAX6830SDUT+T only when system-level reset polarity mandates active-high assertion |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no VCC2 monitor; 200ms reset timeout; SOT23-6 | Suitable only for systems with single-rail supervision need and no auxiliary voltage monitoring requirement | Choose TPS3808G33DBVR only if VCC2 supervision is unnecessary and longer reset timeout is acceptable |
Compared with MAX6830SDUT+T, the MAX6829SDUT+T provides active-low reset polarity essential for legacy µPs like 8051 or PIC; versus TPS3808G33DBVR, it delivers true dual-rail supervision with factory-trimmed VCC2 threshold - eliminating design compromises in multivoltage systems.
Availability
MAX6829SDUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring applications requiring stable component supply across extended temperature ranges.
Supply support for MAX6829SDUT+T 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 industrial, medical, communications, and consumer applications.
The MAX6826–MAX6831 product line delivers compact, ultra-low-power dual-supply supervisors targeting space- and power-constrained embedded systems requiring robust power-on reset and watchdog functionality.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6829SDUT+T over temperature?
The MAX6829SDUT+T has a factory-trimmed VCC2 reset threshold of 2.188V, with ±3% tolerance over the full −40°C to +125°C operating range. This value is specified in the Electrical Characteristics table under "VCC2 Reset Threshold" for suffix 'Y', confirmed by the Standard Versions Table where 'SD' maps to VCC = 3.08V and 'Y' maps to VCC2 = 2.188V. The MAX6829SDUT+T maintains this accuracy without external calibration components.
Does MAX6829SDUT+T support manual reset assertion during brownout conditions?
Yes, the MAX6829SDUT+T supports manual reset assertion down to VCC = +1.0V. Its MR input features an internal 50kΩ pullup to VCC and remains functional across the entire operating voltage range. When MR is pulled low, RESET asserts immediately and holds for ≥140ms after MR returns high - even if VCC is near its minimum valid level. This behavior is guaranteed per the Absolute Maximum Ratings and Electrical Characteristics sections of the MAX6829SDUT+T datasheet.
What is the watchdog timeout period for MAX6829SDUT+T, and how is it cleared?
The MAX6829SDUT+T features a nominal 1.6s watchdog timeout period (0.8s to 2.6s over temperature), cleared by any rising or falling edge on the WDI pin. The internal timer resets on each detected transition, enabling flexible firmware integration - such as toggling WDI at task boundaries rather than fixed intervals. If WDI remains static beyond the timeout, RESET asserts for ≥140ms. The MAX6829SDUT+T watchdog is disabled when WDI is left unconnected or driven by a three-stated buffer.
Can MAX6829SDUT+T monitor a 1.8V rail as VCC2?
Yes, the MAX6829SDUT+T is specifically designed to monitor 1.8V rails as VCC2. Its factory-trimmed VCC2 threshold is 2.188V, which falls within the +0.9V to +2.5V supported range and provides 388mV of headroom above 1.8V - ensuring reliable detection of 1.8V rail collapse. The device requires no external resistors or adjustments; the 1.8V supply connects directly to pin 5 (VCC2), and the comparator triggers when voltage drops below 2.188V. This capability is explicitly listed in the General Description and Selector Guide for MAX6829/MAX6830/MAX6831.
What is the maximum allowable VCC transient duration that will not trigger a reset on MAX6829SDUT+T?
For a VCC transient 100mV below the 3.08V threshold (i.e., at 2.98V), the MAX6829SDUT+T will not issue a spurious reset if the transient duration is ≤20µs - as shown in Figure MAX6826 toc06 ("Maximum VCC Transient Duration vs. Reset Threshold Overdrive"). This immunity applies to negative-going glitches and is guaranteed across temperature. The MAX6829SDUT+T's internal filtering rejects such brief disturbances while remaining responsive to sustained brownouts, enhancing reliability in electrically noisy environments.
MAX6829SDUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 0.788V, 2.93V
- 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
MAX6829SDUT+T FAQ
1.How can I place an order for MAX6829SDUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6829SDUT+T 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 MAX6829SDUT+T reliable?
The price and inventory of MAX6829SDUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6829SDUT+T is usually 5 days.
3.What payment methods are accepted for MAX6829SDUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6829SDUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6829SDUT+T?
MAX6829SDUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6829SDUT+T 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 MAX6829SDUT+T?
For technical support, including MAX6829SDUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6829SDUT+T requirements.
6.How does Aetrix verify that MAX6829SDUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6829SDUT+T 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 MAX6829SDUT+T meets industry standards.
7.What is the process for return or replacement of MAX6829SDUT+T?
All MAX6829SDUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6829SDUT+T, 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 MAX6829SDUT+T part is unused and in its original packaging.
Return procedure for MAX6829SDUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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