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Analog Devices Inc./Maxim Integrated MAX6727AKASDD3+
- Part No.:
- MAX6727AKASDD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6727AKASDD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6727AKASDD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory IC in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (adjustable third supply) with factory-trimmed thresholds of 4.625V (VTH1), 3.075V (VTH2), and 626.5mV reference for RSTIN. It provides open-drain active-low RST and RST2 outputs, 210ms minimum reset timeout, watchdog disable capability, and operates from -40°C to +125°C. It is used in multivoltage embedded systems requiring reliable power-up sequencing and brownout detection.
For engineers reviewing the MAX6727AKASDD3+ datasheet, MAX6727AKASDD3+ pinout, MAX6727AKASDD3+ application, or MAX6727AKASDD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), guaranteed reset validity down to VCC1/VCC2 = 0.8V, ultra-low 14µA typical supply current at 3.6V, and compatibility with manual-reset, watchdog, and power-fail monitoring functions in space-constrained industrial and telecom designs.
Technical Context
The MAX6727AKASDD3+ integrates two independent voltage comparators for VCC1 and VCC2 supervision plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap, enabling precise external resistor-divider-based monitoring of a third supply as low as 0.62V. Its reset logic asserts RST/RST2 low when any monitored voltage falls below its threshold and holds reset for a fixed 210ms (min) timeout after all voltages recover.
It features a watchdog timer with 35s startup delay and 1.12s normal timeout (disabled by leaving WDI unconnected), manual-reset input with 50kΩ internal pullup to VCC1, and supports both push-pull and open-drain output configurations - though MAX6727A specifically uses open-drain RST and RST2 outputs referenced to VCC1 and VCC2 respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, ±1.5% over -40°C to +125°C); ensures reliable reset assertion during 4.5–5.0V primary rail brownout. |
| VCC2 Reset Threshold | 3.075V (factory-trimmed, ±1.5% over -40°C to +125°C); matches common 3.3V secondary rails with tight tolerance. |
| RSTIN Reference Voltage | 626.5mV (internal bandgap, ±1.5%); enables accurate third-supply monitoring via external resistor divider (e.g., 1.2V, 1.8V, or 2.5V). |
| Reset Timeout Period | 210ms (minimum); guarantees sufficient hold time for μP initialization and peripheral settling before release. |
| Supply Current | 14µA typical at 3.6V; minimizes quiescent power draw in battery-backed or always-on systems. |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive, industrial control, and telecom infrastructure applications. |
| Reset Output Type | Open-drain RST and RST2; allows flexible level-shifting and wired-OR reset bus configuration with external pullups. |
Pinout & Package
MAX6727AKASDD3+ is housed in an 8-pin SOT23 package (JEDEC MO-203AA), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm max height - optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output referenced to VCC1; asserted when VCC1, VCC2, or RSTIN drops below threshold or MR is pulled low. |
| 2 | GND | Analog/digital ground reference for all internal comparators, timers, and output drivers. |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; forces reset when pulled low, with glitch rejection and no external debounce required. |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry when above VCC1 and sets VCC2 reset threshold. |
| 5 | VCC1 | Primary supply input (1.8V–5.0V range); powers device when above VCC2 and sets VCC1 reset threshold. |
| 6 | RSTIN | High-impedance adjustable reset comparator input; triggers RST assertion when voltage falls below 626.5mV reference. |
| 7 | RST2 | Second active-low open-drain reset output referenced to VCC2; independently driven but synchronized with RST logic. |
| 8 | PFO | Active-low open-drain power-fail output; asserts when PFI (not present on MAX6727A) falls below 626.5mV - unused on this variant. |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitoring | Simultaneous 4.625V (VCC1) and 3.075V (VCC2) thresholds with ±1.5% accuracy over full temperature range - eliminates external resistor networks and calibration. |
| Adjustable third-supply monitor (RSTIN) | 626.5mV internal reference enables precise monitoring of auxiliary rails (e.g., 1.2V core, 1.8V I/O) using only two external resistors - reduces BOM count and layout area. |
| Guaranteed reset validity down to 0.8V | Ensures correct RST/RST2 logic state even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V - critical for fail-safe system shutdown. |
| 210ms minimum reset timeout | Provides deterministic, temperature-stable hold time for μP boot sequence and peripheral initialization without external RC timing components. |
| Open-drain dual reset outputs (RST + RST2) | Allows independent reset signaling to different voltage domains (e.g., RST to 3.3V logic, RST2 to 1.8V core) with shared assertion timing - simplifies multi-rail power sequencing. |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Monitors 5V backplane, 3.3V FPGA I/O, and 1.2V processor core supplies in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting synchronized RST and RST2 signals to ensure safe startup and brownout recovery across isolated voltage domains. Use Value: Prevents partial initialization and latch-up by guaranteeing 210ms reset hold time and valid reset state down to 0.8V - eliminating field failures due to marginal power conditions. |
Use Scenario: Embedded in a carrier-grade Ethernet line card with redundant 12V DC input, 5V intermediate, and 3.3V/1.8V digital supplies. IC Role / Device Role / Timing Role: Dual-threshold supervisor (VCC1=5V, VCC2=3.3V) with RSTIN monitoring 1.8V SerDes supply; provides fault isolation and graceful restart on supply sag. Use Value: 14µA quiescent current extends uptime in standby mode; ±1.5% threshold accuracy avoids false resets during thermal cycling in sealed chassis. |
| Medical Imaging Sensor Module | Automotive ADAS Camera ECU |
Use Scenario: Powers a low-noise analog front-end and ARM Cortex-M7 SoC in a portable ultrasound probe with battery and USB-C input paths. IC Role / Device Role / Timing Role: Supervises 3.3V analog, 1.8V digital, and 1.2V core supplies; RSTIN configured for 1.2V rail with 0.626V reference and precision divider. Use Value: Open-drain RST/RST2 outputs enable level-shifted reset to mixed-voltage subsystems without additional translators - reducing component count and board area. |
Use Scenario: Used in a rear-view camera ECU operating in under-hood environment with wide ambient temperature swings (-40°C to +125°C). IC Role / Device Role / Timing Role: Triple-supply monitor for 5V camera sensor, 3.3V image signal processor, and 1.2V core - with MR input for diagnostic reset and watchdog disable. Use Value: AEC-Q100-compliant design assurance (via MAX6727A family qualification) and guaranteed operation at 0.8V support robust cold-cranking behavior and ISO 16750-2 pulse immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6723AUTTWD3+ | Same 8-pin SOT23 package, identical VTH1/VTH2 (4.625V/3.075V) and RSTIN reference, but includes watchdog timer enabled by default (WDI input active); 210ms timeout. | Required where software-level processor activity monitoring is needed alongside power supervision - e.g., infotainment head units with long boot sequences. | Select MAX6723AUTTWD3+ if watchdog functionality is required; MAX6727AKASDD3+ is preferred when watchdog is unnecessary and lowest possible complexity is desired. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), 200ms timeout, 1.5µA supply current, SOT23-6 package; lacks VCC2 and RSTIN inputs - monitors only one rail. | Suitable only for simpler systems with single regulated supply; cannot replace triple-monitoring function without adding discrete comparators or second IC. | Choose TPS3808G33DBVR only for cost-sensitive, single-rail applications where dual/third-supply monitoring is not required - not a functional substitute for MAX6727AKASDD3+. |
Compared with MAX6723AUTTWD3+, MAX6727AKASDD3+ removes watchdog circuitry to reduce leakage and simplify firmware integration; compared with TPS3808G33DBVR, it delivers true triple-supply supervision in the same footprint while maintaining identical threshold accuracy and temperature range - making it the only drop-in solution for multivoltage reliability-critical designs.
Availability
MAX6727AKASDD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical imaging modules, and automotive ADAS ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6727AKASDD3+ 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 communications applications.
The MAX6715A–MAX6729A family was engineered to replace discrete reset circuits and multiple comparators in multivoltage embedded systems - delivering higher reliability, smaller footprint, and guaranteed parametric performance over automotive and industrial temperature ranges.
FAQ
What is the reset timeout period of the MAX6727AKASDD3+?
The MAX6727AKASDD3+ has a minimum reset timeout period of 210ms. This duration is factory-trimmed and guaranteed over the full -40°C to +125°C operating temperature range. The timeout begins when all monitored supplies (VCC1, VCC2, RSTIN) rise above their respective thresholds and ends with deassertion of the RST and RST2 outputs. No external components are required to set or adjust this timing.
Does the MAX6727AKASDD3+ support watchdog functionality?
No, the MAX6727AKASDD3+ does not include watchdog functionality. It is a dedicated triple-supply supervisory IC with RST, RST2, MR, and RSTIN - but no WDI pin or internal watchdog timer. For watchdog capability in the same family, consider MAX6723AUTTWD3+ or MAX6724AUTTWD3+, which integrate a dual-mode watchdog with 35s startup and 1.12s normal timeout periods.
What are the exact reset threshold voltages for MAX6727AKASDD3+?
The MAX6727AKASDD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 (primary supply) and 3.075V for VCC2 (secondary supply), with ±1.5% accuracy over -40°C to +125°C. Its RSTIN input uses a 626.5mV internal reference, enabling precise third-supply monitoring via external resistor divider - for example, setting a 1.2V trip point with R1 = 909kΩ and R2 = 511kΩ.
Can MAX6727AKASDD3+ monitor a 1.2V supply as the third voltage?
Yes, the MAX6727AKASDD3+ can monitor a 1.2V supply using its RSTIN pin. With a 626.5mV internal reference, a resistor divider (e.g., R1 = 909kΩ, R2 = 511kΩ) scales the 1.2V rail to ~626mV at RSTIN. When the 1.2V supply drops below ~1.18V, RSTIN falls below threshold and triggers reset - providing accurate, low-power auxiliary rail supervision without external comparators.
What is the supply current consumption of MAX6727AKASDD3+ at 3.6V?
The MAX6727AKASDD3+ draws 14µA typical supply current at 3.6V and +25°C, with a maximum of 39µA over temperature and process variation. This ultra-low quiescent current makes it ideal for battery-powered or energy-harvesting systems where standby power budget is constrained - and remains stable across the full -40°C to +125°C operating range.
MAX6727AKASDD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 0.788V, 2.925V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6727AKASDD3+ FAQ
1.How can I place an order for MAX6727AKASDD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6727AKASDD3+ 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 MAX6727AKASDD3+ reliable?
The price and inventory of MAX6727AKASDD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6727AKASDD3+ is usually 5 days.
3.What payment methods are accepted for MAX6727AKASDD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6727AKASDD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6727AKASDD3+?
MAX6727AKASDD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6727AKASDD3+ 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 MAX6727AKASDD3+?
For technical support, including MAX6727AKASDD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6727AKASDD3+ requirements.
6.How does Aetrix verify that MAX6727AKASDD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6727AKASDD3+ 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 MAX6727AKASDD3+ meets industry standards.
7.What is the process for return or replacement of MAX6727AKASDD3+?
All MAX6727AKASDD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6727AKASDD3+, 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 MAX6727AKASDD3+ part is unused and in its original packaging.
Return procedure for MAX6727AKASDD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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