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Analog Devices Inc./Maxim Integrated MAX6727KASYD3
- Part No.:
- MAX6727KASYD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6727KASYD3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6727KASYD3 from Maxim Integrated is a dual-voltage, ultra-low-voltage microprocessor supervisory circuit in 8-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, adjustable RSTIN input (626.5mV reference), and open-drain active-low RST/RST1 outputs - used to ensure reliable power-on reset and brownout protection in battery-powered embedded systems.
For engineers reviewing the MAX6727KASYD3 datasheet, MAX6727KASYD3 pinout, MAX6727KASYD3 application, or MAX6727KASYD3 equivalent, key selection criteria include dual-supply threshold accuracy, guaranteed reset validity down to 0.8V on either supply, low 14µA typical supply current, immunity to sub-20µs VCC transients, and compatibility with manual-reset and watchdog-free system architectures.
Technical Context
The MAX6727KASYD3 implements independent voltage comparators for VCC1 and VCC2 with factory-trimmed thresholds (4.625V ±125mV and 3.075V ±75mV), hysteresis of 0.5%, and temperature coefficient of 20ppm/°C. It asserts reset when either supply falls below its threshold and holds reset for a minimum 210ms after both supplies recover.
This variant includes RSTIN input for third-voltage monitoring (626.5mV internal reference, ±15.5mV tolerance), supports manual-reset via MR (internal 50kΩ pullup to VCC1), and features open-drain RST/RST1 outputs referenced to VCC1 - no watchdog or power-fail functionality per pin configuration and suffix coding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (±125mV) - sets primary supply brownout detection point for 5V or 4.8V rails |
| VCC2 Threshold | 3.075V (±75mV) - enables reliable monitoring of 3.3V I/O or auxiliary supplies |
| RSTIN Reference | 626.5mV (±15.5mV) - allows external resistor-divider to monitor third supply ≥0.62V |
| Reset Timeout | 210ms (min) - ensures µP completes boot sequence before releasing reset |
| Supply Current | 14µA (typ at 3.6V) - minimizes quiescent drain in always-on battery-backed systems |
| Valid Reset Range | VCC1 or VCC2 ≥ 0.8V - guarantees correct reset logic state during deep brownout |
| VCC Transient Immunity | Immune to <20µs negative glitches - prevents spurious resets from switching noise |
Pinout & Package
Package: 8-pin SOT23 (3.0mm × 1.7mm × 1.3mm, JEDEC MO-178AA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST / RST1 | Active-low open-drain reset output; requires external pullup; asserted when VCC1/VCC2/RSTIN drop below threshold or MR pulled low |
| 2 | GND | Ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual-reset input; internal 50kΩ pullup to VCC1; reset remains active for full 210ms timeout after MR release |
| 4 | VCC2 | Secondary supply input; powers internal circuitry when > VCC1 and provides reference for VCC2 comparator |
| 5 | RSTIN | Adjustable undervoltage monitor input; high-impedance (±100nA); referenced to 626.5mV internal bandgap |
| 6 | VCC1 | Primary supply input; powers device when > VCC2 and provides reference for VCC1 comparator |
| 7 | RST2 | Active-low open-drain secondary reset output; referenced to VCC2; mirrors RST/RST1 logic but driven independently |
| 8 | NC | No connect - internally unconnected; must be left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision with separate comparators and hysteresis |
| Externally adjustable third-voltage monitor | RSTIN input with 626.5mV precision reference enables monitoring of supplies as low as 0.62V using resistor dividers |
| Guaranteed operation down to 0.8V | Reset logic remains valid even if VCC1 or VCC2 sags to 0.8V - critical for low-power brownout recovery |
| Low-quiescent-current design | 14µA typical ICC at 3.6V enables multi-year battery life in always-on IoT endpoint applications |
| Open-drain dual reset outputs | RST/RST1 and RST2 provide flexible reset signaling to multiple domains (e.g., core + I/O) with independent pullup options |
Applications
| Industrial PLC I/O Modules | Medical Wearable Sensors |
|---|---|
Use Scenario: Monitoring 5V fieldbus power and 3.3V sensor interface rail in compact industrial I/O modules subject to EMI-induced supply droop. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting synchronized reset to MCU and isolated RS-485 transceivers upon any rail collapse. Use Value: Prevents firmware lockup during transient brownouts by enforcing 210ms minimum reset hold time while maintaining valid reset state down to 0.8V on either rail. | Use Scenario: Ensuring safe startup and fault recovery in battery-powered ECG patch devices with 4.2V Li-ion and 3.0V analog front-end supplies. IC Role / Device Role / Timing Role: Primary supervisor for main SoC and secondary supervisor for analog signal chain, with RSTIN monitoring backup LDO output. Use Value: 14µA quiescent current extends battery life; 626.5mV RSTIN reference enables precise low-voltage monitoring of 1.8V auxiliary rails without additional components. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Supervising 5V CAN transceiver supply and 3.3V microcontroller domain in under-hood body control modules operating from wide-input DC-DC converters. IC Role / Device Role / Timing Role: Dual-rail supervisor providing fail-safe reset coordination between safety-critical MCU and communication peripherals across -40°C to +125°C. Use Value: Guaranteed reset validity at 0.8V ensures deterministic behavior during cold-crank events; 20ppm/°C tempco maintains threshold accuracy over full automotive temperature range. | Use Scenario: Power sequencing and brownout protection in DIN-rail mounted electricity meters with split 5V logic and 3.3V metrology ADC supplies. IC Role / Device Role / Timing Role: Core supervisor enabling clean power-up of metering SoC and preventing corrupted flash writes during grid voltage sags. Use Value: 210ms timeout aligns with EEPROM write cycle requirements; open-drain RST2 output isolates reset signaling to metrology subsystem without shared pullup conflicts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KASYD3 | Identical pinout and thresholds, but push-pull RST/RST1 outputs instead of open-drain | Requires no external pullup resistors; unsuitable where level-shifting or wired-OR reset buses are needed | Select when driving CMOS inputs directly and minimizing BOM count is prioritized over bus flexibility |
| TPS3808G33DBVR | Single-supply (3.3V only), no RSTIN input, 200ms timeout, 1.6µA supply current | Lacks dual-supply monitoring and third-voltage capability; optimized for ultra-low-power single-rail systems | Choose only for cost-sensitive 3.3V-only designs where RSTIN and VCC2 monitoring are unnecessary |
Compared with MAX6726KASYD3, the MAX6727KASYD3 offers bus-friendly open-drain outputs for shared reset lines; versus TPS3808G33DBVR, it delivers essential dual-rail supervision and RSTIN expandability at higher quiescent current - making it the sole fit for systems requiring coordinated 4.625V/3.075V rail monitoring with third-voltage flexibility.
Availability
MAX6727KASYD3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical wearable sensors, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6727KASYD3 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 power, sensing, and connectivity in harsh environments.
The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits optimized for space-constrained, battery-operated, and automotive-grade systems requiring dual/triple supply monitoring with guaranteed operation down to 0.8V.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6727KASYD3?
The MAX6727KASYD3 has a factory-trimmed VCC1 reset threshold of 4.625V, with a tolerance of ±125mV over the full -40°C to +125°C temperature range. This value is fixed by the "K" suffix in the part number and confirmed in Maxim's Reset Voltage Threshold Suffix Guide. The MAX6727KASYD3 uses this threshold to detect brownout on primary 5V or 4.8V system rails.
Does the MAX6727KASYD3 include watchdog timer functionality?
No, the MAX6727KASYD3 does not include watchdog timer functionality. Its pinout lacks WDI (Watchdog Input), and the "27" in the part number corresponds to the MAX6727A variant, which is explicitly defined in the datasheet as a dual-supply supervisor with RSTIN input but no watchdog or power-fail features. Watchdog capability begins with MAX6721A and higher variants.
What is the function of Pin 8 (NC) on the MAX6727KASYD3?
Pin 8 on the MAX6727KASYD3 is designated NC (No Connect) and is internally unconnected. It must be left floating in the PCB layout; tying it to GND is acceptable per Maxim's layout recommendations but provides no functional benefit. This pin is reserved for future variants and has no electrical role in the MAX6727KASYD3.
Can the MAX6727KASYD3 monitor a 1.2V supply using the RSTIN input?
Yes, the MAX6727KASYD3 can monitor a 1.2V supply using RSTIN by configuring an external resistor divider. With its 626.5mV internal reference, a divider ratio of R1/R2 = (1.2V / 0.6265V) − 1 ≈ 0.915 achieves trip point at 1.2V. The MAX6727KASYD3's ±100nA RSTIN input leakage ensures minimal error from large-value resistors, enabling low-power implementation.
What is the maximum operating temperature range for the MAX6727KASYD3?
The MAX6727KASYD3 is rated for continuous operation from -40°C to +125°C, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This extended temperature range is validated across all parameters including reset thresholds, timeout accuracy, and supply current, making it suitable for under-hood automotive and industrial applications.
MAX6727KASYD3 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:
- 2.188V, 2.925V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6727KASYD3 FAQ
1.How can I place an order for MAX6727KASYD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6727KASYD3 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 MAX6727KASYD3 reliable?
The price and inventory of MAX6727KASYD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6727KASYD3 is usually 5 days.
3.What payment methods are accepted for MAX6727KASYD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6727KASYD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6727KASYD3?
MAX6727KASYD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6727KASYD3 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 MAX6727KASYD3?
For technical support, including MAX6727KASYD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6727KASYD3 requirements.
6.How does Aetrix verify that MAX6727KASYD3 is sourced from the original manufacturer or authorized distributors?
All MAX6727KASYD3 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 MAX6727KASYD3 meets industry standards.
7.What is the process for return or replacement of MAX6727KASYD3?
All MAX6727KASYD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6727KASYD3, 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 MAX6727KASYD3 part is unused and in its original packaging.
Return procedure for MAX6727KASYD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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