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Analog Devices Inc./Maxim Integrated MAX6727KAYHD3+
- Part No.:
- MAX6727KAYHD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6727KAYHD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:813
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Product details
Overview
MAX6727KAYHD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (adjustable third supply) with factory-trimmed thresholds of 4.625V and 3.075V, 210ms reset timeout, and open-drain dual RST outputs. It ensures reliable system reset during brownout, power-up, or watchdog fault conditions in multivoltage embedded systems.
For engineers reviewing the MAX6727KAYHD3+ datasheet, MAX6727KAYHD3+ pinout, MAX6727KAYHD3+ application, or MAX6727KAYHD3+ equivalent, this page delivers verified electrical specs, validated pin functions, confirmed triple-supply monitoring capability, and real-world design context for telecom, industrial, and portable equipment power sequencing and fault recovery.
Technical Context
The MAX6727KAYHD3+ integrates three independent voltage monitors: VCC1 threshold at 4.625V (±125mV), VCC2 at 3.075V (±75mV), and RSTIN referenced to a 626.5mV internal bandgap, enabling precise auxiliary rail supervision down to 0.62V via external resistor divider. Its dual open-drain RST outputs share identical logic but drive separate pins for redundancy or multi-rail reset distribution.
It features a 210ms minimum reset timeout (D3 suffix), manual reset input (MR) with 50kΩ internal pullup to VCC1, and watchdog timer with 35s startup mode and 1.12s normal mode-activated only on WDI transitions. No PFI/PFO or push-pull output functionality is included in this variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (min 4.500V, max 4.750V); ensures reset assertion before 5V rail collapse affects CPU core stability |
| VCC2 Reset Threshold | 3.075V (min 3.000V, max 3.150V); guarantees clean reset of I/O or memory rails powered from 3.3V supplies |
| RSTIN Threshold | 626.5mV (±15.5mV); enables accurate monitoring of sub-1V rails (e.g., 1.2V, 1.8V) using external resistor divider |
| Reset Timeout Period | 210ms (min 140ms, max 280ms); provides sufficient hold time for full FPGA/ASIC configuration and PLL lock |
| Supply Current | 14µA typical at 3.6V; supports ultra-low-power battery-backed systems without compromising supervision integrity |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade deployment in telecom infrastructure and factory automation |
| Reset Output Type | Dual open-drain RST outputs; allows flexible pullup to different voltage domains (e.g., VCC1 and VCC2) for multi-rail reset control |
Pinout & Package
MAX6727KAYHD3+ uses an 8-pin SOT23-8 package (JEDEC MO-203AA), with exposed pad for thermal enhancement and standard lead-free finish. Pin spacing is 0.65mm, body dimensions 3.0mm × 1.7mm × 1.3mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4 | RST / RST1 | Dual open-drain active-low reset outputs sharing same internal logic; each requires external pullup for proper level translation |
| 2 | GND | Analog/digital ground reference; must be connected to low-impedance system ground plane for noise immunity |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; debounced by 1µs pulse width requirement |
| 5 | RSTIN | High-impedance adjustable monitor input; threshold set by external resistor divider to 626.5mV reference |
| 6 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal comparator for VCC2 monitoring and sets RST2 reference if present (not used in MAX6727) |
| 7 | VCC1 | Primary supply input (1.8V–5.0V range); powers device core, defines RST/RST1 output reference, and enables MR pullup |
| 8 | WDI | Watchdog input with 100ns glitch rejection; triggers reset if no edge occurs within 1.12s after initial 35s startup window |
Key Features
| Feature | Design Value |
|---|---|
| Dual open-drain RST outputs | Enables independent reset signaling to two voltage domains (e.g., CPU core and I/O subsystem) without level-shifter components |
| Triple-supply monitoring (VCC1/VCC2/RSTIN) | Supports complex power architectures requiring coordinated reset across primary, secondary, and auxiliary rails (e.g., DDR termination, analog bias) |
| 210ms guaranteed reset timeout | Meets JEDEC JESD22-A102B requirements for power-on reset hold time in high-reliability embedded controllers |
| 626.5mV precision RSTIN reference | Allows ±1% threshold accuracy on third rail using standard 1% resistors, eliminating need for external reference ICs |
| 14µA typical supply current | Reduces quiescent load on backup batteries or energy-harvesting sources in always-on monitoring applications |
Applications
| Telecom Line Card Power Sequencing | Industrial PLC I/O Module Supervision |
|---|---|
Use Scenario: Dual 3.3V/5V power rails with auxiliary 1.2V FPGA configuration supply require synchronized reset during hot-swap insertion. IC Role / Device Role / Timing Role: MAX6727KAYHD3+ monitors all three rails and asserts dual RST signals to isolate FPGA and microcontroller until all voltages stabilize. Use Value: Prevents partial configuration and metastability by enforcing 210ms minimum reset hold, matching FPGA TCONFIG spec. |
Use Scenario: Programmable logic controller with isolated 24V field I/O, 5V logic, and 3.3V communication interface demands fault-tolerant reset coordination. IC Role / Device Role / Timing Role: MAX6727KAYHD3+ supervises 5V logic (VCC1), 3.3V UART (VCC2), and 24V-to-5V converter feedback (RSTIN) to trigger fail-safe shutdown. Use Value: 626.5mV RSTIN reference enables direct monitoring of 24V rail via 39:1 resistor divider, avoiding extra regulator. |
| Portable Medical Device Battery Management | Network Switch ASIC Initialization |
Use Scenario: Lithium-ion powered patient monitor with 3.3V MCU, 1.8V sensor interface, and 5V display backlight requires brownout detection below 3.0V. IC Role / Device Role / Timing Role: MAX6727KAYHD3+ uses VCC1=3.3V, VCC2=1.8V, and RSTIN to monitor battery voltage divider, asserting RST before critical undervoltage. Use Value: 14µA supply current extends battery life >12 months in standby; 210ms timeout ensures EEPROM write completion before reset. |
Use Scenario: High-speed Ethernet switch ASIC requires strict power sequencing: 1.2V core, 2.5V I/O, and 3.3V management rail with interlocked reset timing. IC Role / Device Role / Timing Role: MAX6727KAYHD3+ monitors 3.3V (VCC1), 2.5V (VCC2), and 1.2V (via RSTIN divider), driving dual RST to ASIC and PMIC simultaneously. Use Value: Dual open-drain RST outputs eliminate need for external OR-gate, reducing BOM count and PCB area in space-constrained switch modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725KA3D3+ | Includes dual RST outputs (one open-drain, one push-pull); same VCC1/VCC2 thresholds and 210ms timeout | Required when one reset signal must drive a 3.3V domain (push-pull) and another a 5V domain (open-drain with pullup) | Select MAX6725KA3D3+ only if mixed-output drive capability is needed; MAX6727KAYHD3+ is preferred for dual open-drain simplicity |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no RSTIN input, no dual RST, 200ms timeout, 2.5µA supply current | Limited to single-rail systems; lacks auxiliary monitoring and redundancy capability of MAX6727KAYHD3+ | Choose TPS3808G33DBVR only for cost-sensitive, single-rail designs where triple monitoring is unnecessary |
Compared with MAX6725KA3D3+, MAX6727KAYHD3+ offers cleaner dual open-drain isolation without push-pull contention risk; versus TPS3808G33DBVR, it delivers essential triple-rail coordination and fault resilience at modest current penalty-critical for multivoltage SoC platforms.
Availability
MAX6727KAYHD3+ is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, portable medical devices, and network switch ASIC initialization requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for MAX6727KAYHD3+ 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 management, sensing, and connectivity in demanding industrial and communications applications.
The MAX6715–MAX6729 family was engineered specifically for multivoltage system supervision-delivering compact, low-power, triple-threshold monitoring with configurable reset behavior for embedded processors in space- and power-constrained environments.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6727KAYHD3+?
The MAX6727KAYHD3+ has a VCC1 reset threshold of 4.625V, with guaranteed min/max limits of 4.500V and 4.750V respectively over temperature. This value is factory-trimmed and encoded in the 'Y' suffix per Maxim's Reset Voltage Threshold Suffix Guide. The threshold remains stable with ±20ppm/°C tempco, ensuring reliable operation across the full -40°C to +85°C range.
Does the MAX6727KAYHD3+ support power-fail detection (PFI/PFO)?
No, the MAX6727KAYHD3+ does not include power-fail input (PFI) or output (PFO) functionality. Per the Selector Guide, only MAX6728/MAX6729 variants integrate PFI/PFO. The MAX6727KAYHD3+ provides triple monitoring via VCC1, VCC2, and RSTIN only-making it ideal for systems needing auxiliary rail supervision without power-fail interrupt generation.
How are the two RST outputs on the MAX6727KAYHD3+ configured and used?
The MAX6727KAYHD3+ provides two identical open-drain RST outputs (pins 1 and 4), driven by the same internal reset logic. They are electrically independent and can be pulled up to different voltage domains (e.g., VCC1 and VCC2) to assert reset on separate subsystems. This eliminates external OR-gating and supports redundant reset paths in safety-critical designs.
What is the function of the WDI pin on the MAX6727KAYHD3+ and how is it timed?
The WDI (watchdog input) pin on the MAX6727KAYHD3+ monitors processor activity: a missing edge beyond 1.12s (normal mode) triggers reset. After power-up or manual reset, it enters a 35s startup mode to allow boot completion. The MAX6727KAYHD3+ requires only one WDI transition to exit startup mode-ensuring robust supervision without false triggers during firmware initialization.
Can the MAX6727KAYHD3+ operate with VCC1 below 1.8V?
No-the MAX6727KAYHD3+ specifies VCC1 operating range as 1.8V to 5.0V per datasheet Absolute Maximum Ratings and Electrical Characteristics. While reset output validity is guaranteed down to VCC1 = 0.8V, functional operation (monitoring, timeout, WDI response) requires VCC1 ≥ 1.8V. For sub-1.8V applications, consider MAX6723/MAX6724 with lower VCC1 min specification.
MAX6727KAYHD3+ 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:
- 1.313V, 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
MAX6727KAYHD3+ FAQ
1.How can I place an order for MAX6727KAYHD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6727KAYHD3+ 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 MAX6727KAYHD3+ reliable?
The price and inventory of MAX6727KAYHD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6727KAYHD3+ is usually 5 days.
3.What payment methods are accepted for MAX6727KAYHD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6727KAYHD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6727KAYHD3+?
MAX6727KAYHD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6727KAYHD3+ 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 MAX6727KAYHD3+?
For technical support, including MAX6727KAYHD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6727KAYHD3+ requirements.
6.How does Aetrix verify that MAX6727KAYHD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6727KAYHD3+ 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 MAX6727KAYHD3+ meets industry standards.
7.What is the process for return or replacement of MAX6727KAYHD3+?
All MAX6727KAYHD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6727KAYHD3+, 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 MAX6727KAYHD3+ part is unused and in its original packaging.
Return procedure for MAX6727KAYHD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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