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Analog Devices Inc./Maxim Integrated MAX6727KAYDD3+
- Part No.:
- MAX6727KAYDD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6727KAYDD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,954
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Product details
Overview
MAX6727KAYDD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (1.575V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference). It provides two open-drain active-low reset outputs (RST/RST1 and RST2), manual reset input, watchdog timer, and operates from -40°C to +85°C. It ensures reliable system boot and brownout recovery in multivoltage embedded power rails.
For engineers reviewing the MAX6727KAYDD3+ datasheet, MAX6727KAYDD3+ pinout, MAX6727KAYDD3+ application, or MAX6727KAYDD3+ equivalent, key selection criteria include dual independent reset outputs, factory-trimmed dual-threshold supervision with auxiliary RSTIN monitoring down to 0.62V, 210ms minimum reset timeout, watchdog startup/normal modes (35s/1.12s), and guaranteed reset validity down to VCC = 0.8V.
Technical Context
The MAX6727KAYDD3+ implements a dual-threshold voltage supervisor with independent VCC1 and VCC2 monitoring paths, plus a high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap. Its reset logic asserts both RST/RST1 and RST2 simultaneously upon any fault condition-VCC1/VCC2 undervoltage, RSTIN drop, or MR assertion-and holds for a fixed 210ms timeout after all monitored voltages recover.
It integrates a dual-mode watchdog timer: a 35s minimum initial timeout after reset enables full system initialization, followed by a 1.12s minimum normal timeout requiring periodic WDI transitions. The device uses BiCMOS process technology, draws only 14µA typical supply current at 3.6V, and guarantees correct reset state down to VCC1 or VCC2 = 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 1.575V (factory-trimmed, ±1.5% over temp; monitors primary supply like 1.8V I/O rail) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over temp; monitors secondary supply like 3.3V core rail) |
| RSTIN Reference | 626.5mV (internal precision bandgap; enables external resistor-divider for third-voltage monitoring) |
| Reset Timeout | 210ms (minimum; ensures sufficient hold time for processor boot sequence before release) |
| Supply Current | 14µA (typ at 3.6V; enables battery-backed or ultra-low-power always-on supervision) |
| Operating Temp | -40°C to +85°C (industrial-grade range; supports telecom, industrial, and networking equipment) |
| Reset Valid Down To | VCC1 or VCC2 = 0.8V (guaranteed logic state integrity during deep brownout conditions) |
Pinout & Package
MAX6727KAYDD3+ is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm height), surface-mount, lead-free compliant. Pin 1 is marked with a dot; pin numbering follows standard SOT23-8 counterclockwise layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST / RST1 | Active-low open-drain reset output; driven by combined VCC1/VCC2/RSTIN/MR fault logic; requires external pullup |
| 2 | GND | Analog/digital ground reference; must be low-impedance connection to system ground plane |
| 3 | MR | Active-low manual reset input; internal 50kΩ pullup to VCC1; accepts TTL/CMOS levels; debounced via 0.1µF cap if noisy |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V); powers internal VCC2 path and sets RST2 reference; also used as RST2 output driver rail |
| 5 | RSTIN | Adjustable undervoltage monitor input; high-impedance (±25nA); referenced to 626.5mV internal bandgap; connect to resistor divider for third-rail monitoring |
| 6 | VCC1 | Primary supply input (1.8V–5.0V); powers main supervisory logic and sets RST/RST1 output driver rail |
| 7 | WDI | Watchdog input; edge-sensitive; resets internal timer on rising/falling transition; long startup mode (35s) after reset, then normal mode (1.12s) |
| 8 | RST2 | Second active-low open-drain reset output; identical timing/function to RST/RST1 but referenced to VCC2 rail; enables dual-rail reset signaling |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST/RST1 and RST2 are separately driven but synchronized; allows independent reset control of I/O and core domains using different supply references |
| Factory-trimmed dual thresholds | VCC1 = 1.575V and VCC2 = 3.075V provide precise, production-tested trip points without external calibration components |
| Externally adjustable third-voltage monitor | RSTIN input with 626.5mV reference enables monitoring of any rail ≥0.62V via resistor divider-e.g., 1.2V analog supply or 5V bias rail |
| Dual-mode watchdog timer | 35s startup timeout prevents false triggers during boot; 1.12s normal timeout ensures rapid detection of software hangs post-initialization |
| Guaranteed operation down to 0.8V | Valid reset assertion and deassertion guaranteed even when VCC1 or VCC2 sags to 0.8V-critical for brownout resilience in unregulated supplies |
Applications
| Industrial PLC Power Sequencing | Telecom Line Card Supervision |
|---|---|
Use Scenario: A programmable logic controller uses separate 24V DC input, 5V logic, and 3.3V FPGA rails, requiring coordinated power-up sequencing and independent brownout detection per rail. IC Role / Device Role / Timing Role: MAX6727KAYDD3+ monitors all three rails simultaneously, asserting dual RST outputs to hold CPU and FPGA in reset until all supplies stabilize, with 210ms timeout ensuring clean release. Use Value: Eliminates need for discrete comparators and timers; reduces BOM count by 3+ components while improving timing accuracy and temperature stability vs. RC-based solutions. | Use Scenario: A carrier-grade line card includes hot-swap controllers, DSPs, and SerDes PHYs powered from multiple isolated DC/DC converters, each requiring independent fault reporting. IC Role / Device Role / Timing Role: MAX6727KAYDD3+ supervises primary (3.3V), secondary (1.2V), and auxiliary (1.8V) rails via VCC1/VCC2/RSTIN; RST2 signals core domain reset while RST/RST1 controls I/O domain. Use Value: Enables domain-isolated reset signaling without cross-rail coupling; 14µA quiescent current extends uptime in standby mode without compromising supervision fidelity. |
| Medical Imaging Sensor Module | Automotive Infotainment Head Unit |
Use Scenario: A portable ultrasound sensor module uses battery-backed 3.3V, 1.8V, and 5V analog rails, where undervoltage on any rail must trigger immediate safe shutdown to preserve image data integrity. IC Role / Device Role / Timing Role: MAX6727KAYDD3+ continuously monitors all three rails; RSTIN tracks the 5V analog supply via resistor divider; MR enables emergency shutdown via front-panel button. Use Value: 626.5mV RSTIN reference enables accurate 5V monitoring with <1% error using standard 1% resistors; 0.8V reset validity ensures fail-safe behavior even during battery sag. | Use Scenario: An automotive infotainment head unit integrates MCU, audio codec, and display driver, each powered from different DC/DC regulators subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: MAX6727KAYDD3+ supervises 5V (VCC1), 3.3V (VCC2), and 1.2V (RSTIN) rails; its immunity to short VCC transients (<20µs at 100mV overdrive) prevents spurious resets during cranking. Use Value: BiCMOS process and internal hysteresis eliminate need for external transient filters; dual RST outputs allow independent reset control of safety-critical vs. non-critical subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725KAUTD3+ | Same 8-pin SOT23 package, dual open-drain RST outputs, identical VCC1/VCC2 thresholds and 210ms timeout-but adds push-pull PFO power-fail output (not present on MAX6727KAYDD3+) | Required where power-fail interrupt generation (e.g., for graceful shutdown) is needed alongside triple-supply monitoring | Select MAX6725KAUTD3+ only if PFO functionality is required; otherwise MAX6727KAYDD3+ offers identical supervision with lower pin-count footprint for pure reset use cases |
| TPS3808G33DBVR | Single-supply supervisor (monitors only one rail), 3.3V fixed threshold, 200ms timeout, SOT23-6 package; no RSTIN, no dual RST outputs, no watchdog | Suitable only for basic single-rail systems; lacks triple-monitoring, auxiliary input, and dual-reset capability | Use TPS3808G33DBVR only for cost-sensitive, single-rail applications where MAX6727KAYDD3+ features are unnecessary; not a functional substitute for triple-voltage supervision |
Compared with MAX6725KAUTD3+, MAX6727KAYDD3+ omits PFO but retains identical triple-supply supervision and dual-RST architecture-making it optimal for reset-only designs. Versus TPS3808G33DBVR, MAX6727KAYDD3+ delivers full triple-rail coverage, adjustable third-rail monitoring, and synchronized dual-domain reset, essential for complex multivoltage systems.
Availability
MAX6727KAYDD3+ is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, medical imaging modules, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6727KAYDD3+ 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, communications, computing, and consumer applications.
The MAX6715–MAX6729 family was designed specifically for multivoltage microprocessor systems needing compact, ultra-low-power, factory-trimmed supervision with flexible reset output configurations and robust fault detection-including brownout, manual reset, watchdog, and power-fail monitoring.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6727KAYDD3+?
The MAX6727KAYDD3+ has a factory-trimmed VCC1 reset threshold of 1.575V (typical), with ±1.5% tolerance over temperature. This value is confirmed in the Reset Voltage Threshold Suffix Guide where "YA" corresponds to VTH1 = 1.575V. The device guarantees correct reset assertion and deassertion down to VCC1 = 0.8V, making it suitable for brownout-prone 1.8V rail supervision. MAX6727KAYDD3+ maintains this precision without external calibration components.
Does the MAX6727KAYDD3+ support monitoring a third voltage, and how is it configured?
Yes, the MAX6727KAYDD3+ supports third-voltage monitoring via the RSTIN pin, which features a precise 626.5mV internal reference voltage. To monitor a third rail (e.g., 5V or 1.2V), connect an external resistor divider between that rail and GND, with the midpoint fed to RSTIN. The threshold is set by VEXT_TH = 626.5mV × ((R1 + R2)/R2). MAX6727KAYDD3+'s ±25nA RSTIN input current enables high-value resistors, minimizing power loss. No additional ICs are required.
What are the reset output configurations available on the MAX6727KAYDD3+?
The MAX6727KAYDD3+ provides two independent active-low open-drain reset outputs: RST/RST1 (referenced to VCC1) and RST2 (referenced to VCC2). Both outputs assert simultaneously upon any fault (VCC1/VCC2 undervoltage, RSTIN drop, MR low, or watchdog timeout) and remain asserted for the full 210ms timeout period. Each requires an external pullup resistor. This dual-output architecture enables domain-specific reset control-for example, holding I/O peripherals and core logic in reset independently.
How does the watchdog timer function on the MAX6727KAYDD3+?
The MAX6727KAYDD3+ integrates a dual-mode watchdog timer: after any reset event, it enters a 35s minimum startup mode to allow full system initialization, then switches to a 1.12s minimum normal mode requiring periodic WDI transitions. A rising or falling edge on WDI clears the timer; failure to update within the timeout asserts reset for 210ms. MAX6727KAYDD3+'s WDI input accepts TTL/CMOS logic and draws <1µA, enabling low-overhead software integration without dedicated hardware timers.
What package type and pin count does the MAX6727KAYDD3+ use?
The MAX6727KAYDD3+ is packaged in an 8-pin SOT23-8 (also called SOT-23-8) surface-mount package measuring 2.0mm × 2.1mm × 1.25mm. It is lead-free and RoHS-compliant. Pin 1 is marked with a dot; the pinout includes VCC1, VCC2, GND, MR, RSTIN, WDI, and two RST outputs (RST/RST1 and RST2). This compact footprint supports high-density PCB layouts in space-constrained applications such as portable medical devices and telecom modules. MAX6727KAYDD3+'s SOT23-8 is distinct from smaller 5- or 6-pin variants in the MAX67xx family.
MAX6727KAYDD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 788mV, 2.188V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6727KAYDD3+ FAQ
1.How can I place an order for MAX6727KAYDD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6727KAYDD3+ 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 MAX6727KAYDD3+ reliable?
The price and inventory of MAX6727KAYDD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6727KAYDD3+ is usually 5 days.
3.What payment methods are accepted for MAX6727KAYDD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6727KAYDD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6727KAYDD3+?
MAX6727KAYDD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6727KAYDD3+ 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 MAX6727KAYDD3+?
For technical support, including MAX6727KAYDD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6727KAYDD3+ requirements.
6.How does Aetrix verify that MAX6727KAYDD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6727KAYDD3+ 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 MAX6727KAYDD3+ meets industry standards.
7.What is the process for return or replacement of MAX6727KAYDD3+?
All MAX6727KAYDD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6727KAYDD3+, 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 MAX6727KAYDD3+ part is unused and in its original packaging.
Return procedure for MAX6727KAYDD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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