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Analog Devices Inc./Maxim Integrated MAX6727KAWGD3
- Part No.:
- MAX6727KAWGD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6727KAWGD3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,460
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Product details
Overview
The MAX6727KAWGD3 from Maxim Integrated is a dual-voltage, ultra-low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary supply) and VCC2 (secondary supply) with factory-trimmed reset thresholds of 4.625V and 3.075V respectively, 210ms minimum reset timeout, and open-drain active-low RST/RST2 outputs. It ensures reliable system reset during power-up, brownout, or manual intervention in battery-powered and industrial embedded systems.
For engineers reviewing the MAX6727KAWGD3 datasheet, MAX6727KAWGD3 pinout, MAX6727KAWGD3 application, or MAX6727KAWGD3 equivalent, key selection considerations include its dual-supply monitoring capability down to 0.8V VCC operation, 14µA typical supply current at 3.6V, adjustable RSTIN input for third-voltage monitoring, watchdog disable option via unconnected WDI, and guaranteed reset validity across -40°C to +125°C.
Technical Context
This device implements dual independent voltage comparators with hysteresis (0.5% of threshold), internal 626.5mV reference for RSTIN/PFI inputs, and a digital timeout counter that restarts on any threshold violation before timeout completion. Its logic detects falling edges on VCC1/VCC2/RSTIN/MR/WDI to assert reset and maintains assertion for the full 210ms min timeout period after all monitored voltages recover.
The MAX6727KAWGD3 features separate open-drain RST (referenced to VCC1) and RST2 (referenced to VCC2) outputs, internal 50kΩ MR pullup, and WDI unconnected-state detection using a 200nA current source-enabling watchdog disable without external components while preventing false triggering from leakage currents exceeding 50nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, ±125mV tolerance); ensures reset assertion when primary supply drops below nominal 5V rail |
| VCC2 Reset Threshold | 3.075V (factory-trimmed, ±75mV tolerance); monitors secondary 3.3V I/O supply with guaranteed validity down to 0.8V VCC2 |
| Reset Timeout Period | 210ms (minimum); provides sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14µA (typical at 3.6V); enables long battery life in portable equipment without compromising supervision reliability |
| RSTIN Threshold Voltage | 626.5mV (internal reference); supports external resistor-divider for monitoring third supply as low as 0.62V |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive, industrial control, and telecom infrastructure applications |
| Reset Propagation Delay | 20µs (VCC to RST); fast response to supply faults minimizes risk of corrupted memory writes or state transitions |
Pinout & Package
MAX6727KAWGD3 is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm height), RoHS-compliant and tape-and-reel packaged for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output referenced to VCC1; requires external pullup; asserts when VCC1/VCC2/RSTIN/MR fault or watchdog timeout occurs |
| 2 | GND | Ground reference for all internal comparators and logic; must be low-impedance connection to system ground plane |
| 3 | MR | Active-low manual-reset input with internal 50kΩ pullup to VCC1; debounced by 1µs minimum pulse width requirement |
| 4 | VCC2 | Secondary supply input powering comparator for VCC2 threshold detection and RST2 output driver |
| 5 | RSTIN | Adjustable reset comparator input; high-impedance node (±100nA) for external resistor-divider monitoring of third supply |
| 6 | VCC1 | Primary supply input powering core logic, VCC1 comparator, and RST output driver; valid operation down to 0.8V |
| 7 | PFO | Active-low open-drain power-fail output referenced to VCC1; asserts independently of reset timeout when PFI < 626.5mV |
| 8 | PFI | Power-fail monitor input with 626.5mV internal reference; used with external divider to detect auxiliary supply failure |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneous VCC1 (1.58–4.63V) and VCC2 (0.79–3.08V) supervision with separate reset outputs avoids single-point failure in multi-rail systems |
| Externally adjustable third-voltage monitor | RSTIN input with 626.5mV reference enables precise monitoring of auxiliary rails (e.g., 1.2V core, 0.9V DDR) using high-value resistors to minimize quiescent current |
| Watchdog timer with dual-mode timing | 35s startup delay followed by 1.12s normal timeout allows full system boot before watchdog enforcement, reducing false resets during initialization |
| Immunity to short VCC transients | Guaranteed no reset for negative-going glitches ≤20µs at 100mV overdrive, eliminating spurious resets from switching noise or ESD |
| Low-voltage operation guarantee | Valid reset assertion and logic states maintained even when VCC1 or VCC2 drops to 0.8V, supporting brownout recovery in deep-sleep modes |
Applications
| Industrial PLC Controller | Automotive ADAS Camera Module |
|---|---|
|
Use Scenario: Monitors 5V main power and 3.3V I/O supply in programmable logic controller CPU board during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RST and RST2 independently to prevent firmware corruption during transient undervoltage conditions. Use Value: 210ms reset timeout ensures complete FPGA configuration reload and register initialization before software execution resumes. |
Use Scenario: Supervises 12V-to-5V DC-DC output and 3.3V image sensor interface supply in rear-view camera module exposed to wide temperature swings. IC Role / Device Role / Timing Role: Provides guaranteed reset validity down to 0.8V VCC to maintain safe state during battery voltage sag below 6V. Use Value: 14µA supply current extends battery backup runtime during ignition-off monitoring mode without compromising supervision integrity. |
| Medical Infusion Pump | 5G Small Cell Baseband Unit |
|
Use Scenario: Ensures fail-safe shutdown when primary 24V DC input or isolated 3.3V logic supply falls below safe operating levels in Class II medical equipment. IC Role / Device Role / Timing Role: Uses RSTIN with external divider to monitor 1.8V ADC reference rail, adding third-voltage supervision without extra ICs. Use Value: Open-drain RST/RST2 outputs enable wired-OR reset bus sharing across multiple subsystems with independent power domains. |
Use Scenario: Monitors 48V PoE-derived 5V bias supply and 3.3V FPGA configuration rail in outdoor small cell unit subject to thermal cycling and lightning-induced surges. IC Role / Device Role / Timing Role: Leverages PFI/PFO pair to generate early power-fail interrupt for graceful baseband processor shutdown before brownout. Use Value: -40°C to +125°C operation and 0.5% threshold hysteresis ensure stable reset behavior across extreme environmental conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KAWGD3 | Push-pull RST/RST2 outputs instead of open-drain; same thresholds and timeout | Eliminates need for external pullup resistors but requires compatible voltage-level interfaces | Select when driving CMOS inputs directly without bus-sharing requirements |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no VCC2 or RSTIN inputs; 200ms timeout | Lacks dual-rail and triple-monitoring capability; lower quiescent current (1.1µA) | Choose only for cost-sensitive single-rail designs where auxiliary monitoring is handled elsewhere |
Compared with MAX6726KAWGD3, the MAX6727KAWGD3 offers flexible bus-sharing via open-drain outputs but requires pullups; versus TPS3808G33DBVR, it delivers critical dual-supply coverage and third-voltage extensibility essential for complex embedded systems.
Availability
MAX6727KAWGD3 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive ADAS modules, medical infusion pumps, and 5G small cell baseband units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6727KAWGD3 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 analog, mixed-signal, and power management ICs for precision, reliability, and energy efficiency in demanding environments.
The MAX6715A–MAX6729A family was designed specifically for ultra-low-voltage microprocessor supervision in space-constrained, multi-rail systems where guaranteed reset validity down to 0.8V and minimal quiescent current are critical.
FAQ
What is the function of the RSTIN pin on the MAX6727KAWGD3?
The RSTIN pin on the MAX6727KAWGD3 is a high-impedance input with a 626.5mV internal reference voltage, enabling external resistor-divider networks to monitor a third supply voltage as low as 0.62V. When the divided voltage at RSTIN falls below 626.5mV, the device asserts RST and RST2 for the full 210ms timeout period. This feature eliminates the need for a separate supervisor IC in triple-rail systems.
How does the MAX6727KAWGD3 handle watchdog functionality?
The MAX6727KAWGD3 includes a dual-mode watchdog timer with a 35s minimum startup period after reset and a 1.12s minimum normal timeout period. The watchdog disables automatically when the WDI pin is left unconnected, using a 200nA internal current source to detect the floating state. This design prevents accidental activation while ensuring robust processor activity monitoring when enabled.
Can the MAX6727KAWGD3 operate reliably at very low supply voltages?
Yes, the MAX6727KAWGD3 guarantees valid reset output logic states when either VCC1 or VCC2 remains above 0.8V, making it suitable for brownout recovery in battery-powered devices. Its internal comparators and timeout circuitry remain functional down to this level, and the 14µA typical supply current at 3.6V further supports ultra-low-power operation without sacrificing supervision integrity.
What are the key differences between the MAX6727KAWGD3 and MAX6726KAWGD3?
The MAX6727KAWGD3 uses open-drain RST and RST2 outputs requiring external pullup resistors, while the MAX6726KAWGD3 provides push-pull outputs referenced to VCC1 and VCC2 respectively. Both share identical reset thresholds (4.625V/3.075V) and 210ms timeout, but the MAX6727KAWGD3 enables wired-OR reset bus configurations essential for multi-processor systems, whereas MAX6726KAWGD3 simplifies direct CMOS interfacing.
How does the MAX6727KAWGD3 respond to short VCC transients?
The MAX6727KAWGD3 is immune to short-duration negative-going VCC transients up to 20µs when the overdrive is 100mV below threshold, as verified in Typical Operating Characteristics. This immunity prevents spurious resets caused by switching noise or ESD events. Adding a 0.1µF bypass capacitor near the VCC pins further enhances transient rejection in noisy environments.
MAX6727KAWGD3 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:
- 1.11V, 1.665V, 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
MAX6727KAWGD3 FAQ
1.How can I place an order for MAX6727KAWGD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6727KAWGD3 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 MAX6727KAWGD3 reliable?
The price and inventory of MAX6727KAWGD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6727KAWGD3 is usually 5 days.
3.What payment methods are accepted for MAX6727KAWGD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6727KAWGD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6727KAWGD3?
MAX6727KAWGD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6727KAWGD3 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 MAX6727KAWGD3?
For technical support, including MAX6727KAWGD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6727KAWGD3 requirements.
6.How does Aetrix verify that MAX6727KAWGD3 is sourced from the original manufacturer or authorized distributors?
All MAX6727KAWGD3 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 MAX6727KAWGD3 meets industry standards.
7.What is the process for return or replacement of MAX6727KAWGD3?
All MAX6727KAWGD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6727KAWGD3, 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 MAX6727KAWGD3 part is unused and in its original packaging.
Return procedure for MAX6727KAWGD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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