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Analog Devices Inc./Maxim Integrated MAX6726KASYD3+
- Part No.:
- MAX6726KASYD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726KASYD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6726KASYD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference). It provides push-pull active-high RST and active-low RST outputs, manual reset input, watchdog timer with 35s startup/1.12s normal timeout, and operates from -40°C to +85°C. It ensures reliable system reset in multivoltage embedded power management.
For engineers reviewing the MAX6726KASYD3+ datasheet, MAX6726KASYD3+ pinout, MAX6726KASYD3+ application, or MAX6726KASYD3+ equivalent, key selection criteria include dual reset output polarity, factory-trimmed dual-threshold supervision, RSTIN-adjustable third-voltage monitoring down to 0.62V, guaranteed reset validity at VCC ≥ 0.8V, and integrated watchdog with long startup period for complex boot sequences.
Technical Context
The MAX6726KASYD3+ implements a dual-comparator architecture with independent VCC1 and VCC2 voltage monitors, plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap. Its reset logic asserts both RST (active-high) and RST (active-low) outputs simultaneously upon any threshold violation, with a fixed 210ms minimum timeout period (D3 suffix).
It integrates a dual-mode watchdog timer: 35s minimum initial timeout after power-up/manual reset, transitioning to 1.12s minimum normal timeout after first WDI edge detection. The MR input features a 50kΩ internal pullup to VCC1 and 200ns propagation delay, while RSTIN and PFI inputs exhibit ≤25nA leakage and 3mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±125mV tolerance); sets primary supply brownout detection point for 5V rail systems |
| VCC2 Threshold | 3.075V (factory-trimmed, ±75mV tolerance); enables precise monitoring of 3.3V auxiliary rails |
| RSTIN Reference | 626.5mV (internal bandgap); allows external resistor-divider to monitor third supply as low as 0.62V |
| Reset Timeout | 210ms (minimum); ensures µP completes initialization before releasing reset in cold-start scenarios |
| Supply Current | 14µA typical at 3.6V; enables battery-backed operation in portable equipment with minimal quiescent drain |
| Operating Temp | -40°C to +85°C; supports industrial and telecom equipment deployed in uncontrolled environments |
| Watchdog Period | 35s startup / 1.12s normal mode; accommodates lengthy firmware boot sequences then enforces tight runtime supervision |
Pinout & Package
MAX6726KASYD3+ uses an 8-pin SOT23-8 package (2.0mm × 2.1mm footprint, 1.1mm height) with gull-wing leads, optimized for high-density PCB layouts in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST (active-high) | Push-pull reset output referenced to VCC1; drives high during valid operation, low only during reset assertion |
| 2 | GND | Analog/digital ground reference for all internal comparators and timing circuits |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; initiates reset on falling edge |
| 4 | PFO | Active-low power-fail output (push-pull); asserts without timeout when PFI falls below 626.5mV |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal VCC2 comparator and sets RST2 reference |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers core logic and sets RST/RST reference |
| 7 | RSTIN/PFI | Shared pin: selectable as adjustable reset monitor (RSTIN) or power-fail input (PFI); high-impedance (≤25nA) |
| 8 | RST (active-low) | Push-pull reset output referenced to VCC1; complements RST for bidirectional µP interface support |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset output polarity | Simultaneous active-high and active-low RST signals eliminate need for external inverters in bidirectional µP reset interfaces |
| Guaranteed reset validity at 0.8V | Ensures clean reset assertion even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V |
| Adjustable third-voltage monitoring | RSTIN input with 626.5mV reference enables monitoring of sub-1V rails (e.g., 1.2V, 1.0V, 0.9V) via external resistor divider |
| Immunity to short VCC transients | Withstands negative-going glitches ≤20µs at 100mV overdrive, preventing spurious resets in noisy power environments |
| Low 14µA supply current | Reduces standby power in battery-operated devices; enables >10-year coin-cell lifetime in always-on monitoring applications |
Applications
| Industrial PLC Controllers | Network Router Power Management |
|---|---|
|
Use Scenario: Monitoring 5V main rail, 3.3V I/O rail, and 1.2V FPGA core rail in programmable logic controllers operating in factory-floor environments with wide temperature swings. IC Role / Device Role / Timing Role: Triple-voltage supervisor ensuring synchronized reset release across all subsystems after power stabilization, with watchdog enforcement of firmware execution integrity. Use Value: Prevents partial initialization failures by holding all domains in reset until all three rails exceed their thresholds, then maintaining reset for 210ms to guarantee stable clock lock and memory initialization. |
Use Scenario: Supervising primary DC-DC converter output (5V), secondary LDO output (3.3V), and PoE-powered auxiliary rail (1.8V) in enterprise-grade network routers. IC Role / Device Role / Timing Role: Dual-reset-output supervisor providing both active-high and active-low signals to coordinate reset sequencing between CPU, switch fabric ASIC, and PHY layer controllers. Use Value: Eliminates need for discrete level-shifting or inversion logic, reducing BOM count and PCB area while enabling simultaneous reset release across heterogeneous silicon vendors' components. |
| Medical Diagnostic Imaging Systems | Automotive Infotainment Head Units |
|
Use Scenario: Ensuring reliable power-up sequencing for multi-rail imaging sensor arrays (5V analog, 3.3V digital, 1.2V ADC core) in portable ultrasound devices. IC Role / Device Role / Timing Role: Triple-supply monitor with RSTIN-adjustable third threshold enabling precise tracking of low-noise analog supply stability prior to sensor activation. Use Value: Guarantees that sensitive analog front-end circuitry remains held in reset until its dedicated low-noise rail achieves <1% regulation, preventing image artifacts from premature sensor biasing. |
Use Scenario: Managing power integrity for infotainment SoC (1.1V core), DDR3 memory (1.5V), and display interface (3.3V) in automotive head units subject to load-dump transients. IC Role / Device Role / Timing Role: Watchdog-equipped supervisor detecting software hangs during CAN bus communication or touchscreen driver execution. Use Value: Dual-mode watchdog (35s boot window + 1.12s runtime supervision) prevents false triggers during extended firmware updates while ensuring rapid recovery from frozen UI threads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725KAUD3+ | Provides identical VCC1/VCC2 thresholds and D3 timeout but uses open-drain RST/RST outputs instead of push-pull | Requires external pullup resistors on both reset lines; unsuitable for direct drive of µP reset pins without level translation | Select MAX6725KAUD3+ only when board layout already includes pullups or when interfacing with legacy µPs requiring open-drain signaling |
| TPS3808G33DBVR | Single-supply monitor (3.3V threshold only) with 200ms timeout; lacks RSTIN/PFI, dual reset outputs, and watchdog functionality | Cannot replace MAX6726KASYD3+ in triple-rail systems; suitable only for single-rail supervision where auxiliary monitoring is handled separately | Choose TPS3808G33DBVR only for cost-sensitive, single-rail applications where RSTIN adjustability, dual reset polarity, and watchdog are unnecessary |
Compared with MAX6725KAUD3+, MAX6726KASYD3+ eliminates external pullup components and simplifies µP interface design; versus TPS3808G33DBVR, it delivers comprehensive triple-supply supervision with integrated watchdog and flexible reset polarity-critical for complex SoC-based systems.
Availability
MAX6726KASYD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical diagnostic imaging systems, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6726KASYD3+ 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, communications, and computing applications.
The MAX6715–MAX6729 family delivers ultra-low-voltage supervisory circuits optimized for multivoltage systems requiring simultaneous monitoring of primary, secondary, and auxiliary rails with integrated watchdog and power-fail detection.
FAQ
What is the exact reset timeout period for MAX6726KASYD3+?
The MAX6726KASYD3+ has a guaranteed minimum reset timeout period of 210ms, corresponding to the 'D3' suffix in its part number. This duration is factory-trimmed and specified over the full -40°C to +85°C operating temperature range. The actual timeout may vary slightly due to process and temperature effects, but remains within the 140ms to 280ms range per datasheet specifications. This fixed delay ensures sufficient time for microprocessor initialization before releasing the reset signal.
Does MAX6726KASYD3+ support monitoring a 1.0V supply rail?
Yes, MAX6726KASYD3+ supports monitoring a 1.0V supply rail using its RSTIN input. With an internal reference voltage of 626.5mV, a simple resistor divider (e.g., R1 = 600kΩ, R2 = 1MΩ) applied to RSTIN sets the trip point to exactly 1.0V. The high-impedance input (≤25nA leakage) minimizes loading on the monitored rail, and the 3mV hysteresis prevents chatter near the threshold. This capability enables precise supervision of modern low-voltage cores without requiring additional external comparators.
How does the dual-mode watchdog timer in MAX6726KASYD3+ operate?
The MAX6726KASYD3+ watchdog operates in two distinct modes: a 35s minimum startup period after any reset event (power-up, MR assertion, or watchdog timeout), followed by a 1.12s minimum normal timeout period triggered by the first valid WDI transition. This architecture accommodates lengthy firmware boot sequences while enforcing strict runtime supervision. The timer clears on every rising or falling edge at WDI, and asserts reset if no transition occurs within the active timeout window-ensuring robust detection of software hangs in production systems.
Can MAX6726KASYD3+ be used with a microprocessor that has a bidirectional reset pin?
Yes, MAX6726KASYD3+ is specifically designed for bidirectional µP reset interfaces through its dual RST outputs: one active-high and one active-low. This eliminates contention issues common with single-output supervisors. When connecting to a bidirectional pin, use the active-low RST output directly (with optional series resistor for current limiting) while leaving the active-high RST unused or tied off. The 50kΩ internal MR pullup and 200ns MR-to-RST delay further simplify integration with µPs requiring manual reset capability.
What is the lowest supply voltage at which MAX6726KASYD3+ guarantees valid reset output logic?
MAX6726KASYD3+ guarantees correct reset output logic state down to VCC1 or VCC2 = 0.8V, as explicitly stated in the datasheet's Absolute Maximum Ratings and Electrical Characteristics tables. This specification ensures reliable reset assertion during deep brownout conditions where other supervisors may fail. For applications requiring reset validity down to 0V, an external pull-down resistor (e.g., 100kΩ) on the active-low RST output is recommended-but this configuration is not needed for standard operation within the 0.8V–5.5V supply range.
MAX6726KASYD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.188V, 2.925V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6726KASYD3+ FAQ
1.How can I place an order for MAX6726KASYD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KASYD3+ 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 MAX6726KASYD3+ reliable?
The price and inventory of MAX6726KASYD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KASYD3+ is usually 5 days.
3.What payment methods are accepted for MAX6726KASYD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KASYD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KASYD3+?
MAX6726KASYD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KASYD3+ 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 MAX6726KASYD3+?
For technical support, including MAX6726KASYD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KASYD3+ requirements.
6.How does Aetrix verify that MAX6726KASYD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6726KASYD3+ 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 MAX6726KASYD3+ meets industry standards.
7.What is the process for return or replacement of MAX6726KASYD3+?
All MAX6726KASYD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KASYD3+, 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 MAX6726KASYD3+ part is unused and in its original packaging.
Return procedure for MAX6726KASYD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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