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Analog Devices Inc./Maxim Integrated MAX6725KAYDD3
- Part No.:
- MAX6725KAYDD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725KAYDD3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6725KAYDD3 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 8-pin SOT23 package, monitoring primary (VCC1) and secondary (VCC2) supplies with factory-trimmed thresholds of 4.625V and 3.075V respectively, 210ms reset timeout, and active-low open-drain RST output. It asserts reset when either supply falls below its threshold, maintains reset for ≥210ms after recovery, and operates reliably down to VCC1 or VCC2 = 0.8V - ideal for telecom power sequencing and industrial embedded controllers requiring robust brownout detection.
For engineers reviewing the MAX6725KAYDD3 datasheet, MAX6725KAYDD3 pinout, MAX6725KAYDD3 application, or MAX6725KAYDD3 equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over -40°C to +125°C), ultra-low 14µA typical supply current at 3.6V, guaranteed reset validity at sub-1V supply levels, and compatibility with manual-reset and watchdog-disabled configurations.
Technical Context
This device integrates two independent voltage comparators with hysteresis (0.5%), a precision 210ms reset timeout timer, and logic-controlled reset assertion via VCC1/VCC2 undervoltage, MR input, or watchdog timeout. Its dual-supply architecture enables simultaneous monitoring of core (e.g., 1.2V/1.8V) and I/O (e.g., 3.3V/5V) rails without external components.
The MAX6725KAYDD3 uses an internal bandgap reference for threshold stability (20ppm/°C tempco) and features glitch-immune reset generation - immune to VCC transients <20µs at 100mV overdrive - ensuring no spurious resets during switching noise or load-step events in DC-DC converter outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over full temperature range - ensures reliable 5V rail supervision) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% - matches common 3.3V I/O supply with margin) |
| Reset Timeout | 210ms (minimum - provides sufficient hold time for FPGA configuration or boot ROM initialization) |
| Supply Current | 14µA typical at 3.6V - enables >10-year battery life in always-on monitoring circuits |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Reset Validity | Guaranteed down to VCC1 or VCC2 = 0.8V - supports valid reset assertion during deep brownout conditions |
| Output Type | Active-low open-drain RST - allows wired-OR reset bus sharing across multiple subsystems |
Pinout & Package
MAX6725KAYDD3 is housed in an 8-pin SOT23 package (3.0mm × 1.7mm × 1.3mm), optimized for space-constrained PCB layouts in portable and telecom equipment. Pin 1 is marked with a dot; pin numbering follows standard SOT23 counterclockwise orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output - requires external pullup; asserts low on VCC1/VCC2 undervoltage or MR activation |
| 2 | GND | Ground reference for all internal comparators and timers - must be low-impedance connection to system ground plane |
| 3 | MR | Active-low manual-reset input - internal 50kΩ pullup to VCC1; 1µs minimum pulse width required for reliable assertion |
| 4 | VCC2 | Secondary supply input - powers internal VCC2 comparator and sets RST2 reference (not used in MAX6725A variant) |
| 5 | VCC1 | Primary supply input - powers device core, defines RST output reference, and feeds primary comparator |
| 6 | RSTIN | Adjustable reset input - high-impedance node referenced to 626mV internal reference; unused pins must connect to VCC1 or GND |
| 7 | PFI | Power-fail input - high-impedance comparator input (626mV threshold); monitors auxiliary supply for early warning shutdown |
| 8 | PFO | Active-low power-fail output - open-drain; asserts without timeout when PFI falls below threshold - used for interrupt signaling |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision with separate comparators - eliminates need for discrete supervisors |
| Factory-trimmed precision thresholds | ±1.5% tolerance over -40°C to +125°C - removes calibration burden in production test and field operation |
| Glitch-immune reset generation | Immunity to VCC transients <20µs at 100mV overdrive - prevents false resets during DC-DC switching noise |
| Low-power operation | 14µA typical ICC at 3.6V - reduces quiescent load on backup batteries or energy-harvesting sources |
| Extended temperature qualification | Full functionality verified from -40°C to +125°C - suitable for industrial motor drives and base station power modules |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring 48V-to-5V and 5V-to-3.3V DC-DC converter outputs in remote radio units. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail drops during hot-swap or overload events. Use Value: Prevents firmware corruption by holding µP in reset until both rails stabilize post-transient - critical for 5G fronthaul timing integrity. |
Use Scenario: Supervising 24V field power and 3.3V logic supply in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Ensures deterministic startup sequence and brownout recovery for real-time I/O scanning. Use Value: 210ms timeout aligns with PLC scan cycle initialization window; open-drain RST enables shared reset bus across multiple I/O cards. |
| Medical Diagnostic Imaging | Automotive ADAS Camera Modules |
Use Scenario: Validating 12V analog front-end and 1.8V digital core supplies in ultrasound beamformer ASICs. IC Role / Device Role / Timing Role: Guarantees reset remains asserted until both supplies exceed thresholds and remain stable for ≥210ms. Use Value: Eliminates risk of partial initialization causing image artifacts - meets IEC 62304 Class C safety requirements. |
Use Scenario: Monitoring 5V camera sensor bias and 1.2V ISP core voltage in surround-view systems. IC Role / Device Role / Timing Role: Detects undervoltage on either rail during cold-cranking or load-dump events. Use Value: Operates down to 0.8V supply - ensures valid reset assertion even during severe battery sag (<6.5V), preventing unsafe camera blackouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KAYDD3 | Push-pull RST output (vs. open-drain); identical thresholds, timeout, and package | Requires no external pullup resistor; incompatible with wired-OR reset buses | Select when driving single-load reset lines directly into µP reset pin without bus sharing |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); 200ms timeout; SOT23-6 package; 2.5µA supply current | Lacks VCC2 monitoring and MR input; not suitable for dual-rail systems | Choose only for cost-sensitive, single-rail applications where secondary supply supervision is unnecessary |
Compared with MAX6725KAYDD3, MAX6726KAYDD3 simplifies layout by eliminating the pullup resistor but sacrifices bus-sharing capability, while TPS3808G33DBVR reduces supply current and cost but cannot replace dual-supply supervision - making MAX6725KAYDD3 uniquely suited for systems requiring coordinated VCC1/VCC2 fault detection with reset bus flexibility.
Availability
MAX6725KAYDD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed performance across extended temperature ranges.
Supply support for MAX6725KAYDD3 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 demanding industrial, automotive, and communications applications - known for high-reliability, temperature-hardened products.
The MAX6715A–MAX6729A family delivers ultra-low-voltage, multi-rail supervision for systems where power integrity and deterministic reset behavior are critical - targeting applications with tight space constraints and harsh operating environments.
FAQ
What are the factory-trimmed reset thresholds for MAX6725KAYDD3?
The MAX6725KAYDD3 has factory-trimmed VCC1 and VCC2 reset thresholds of 4.625V and 3.075V respectively, with ±1.5% tolerance over -40°C to +125°C. These values are encoded in the part number suffix "YD" per Maxim's Reset Voltage Threshold Suffix Guide and are laser-trimmed during production - no external resistor adjustment is needed for these rails.
Does MAX6725KAYDD3 support manual reset functionality?
Yes, MAX6725KAYDD3 includes an active-low manual-reset input (MR) with internal 50kΩ pullup to VCC1. Pulling MR low for ≥1µs forces reset assertion, which remains active for the full 210ms timeout period after MR returns high. This feature enables operator-initiated resets, test-mode entry, or external logic-triggered recovery - all without additional components.
Can MAX6725KAYDD3 monitor a third voltage rail?
Yes, MAX6725KAYDD3 provides an RSTIN input referenced to a precise 626mV internal bandgap. By connecting an external resistor divider from VEXT to GND with RSTIN at the midpoint, users can monitor a third supply down to 0.62V. The MAX6725KAYDD3 datasheet specifies RSTIN input current ≤±100nA, enabling high-impedance, low-power monitoring networks.
What is the reset output type and drive capability of MAX6725KAYDD3?
MAX6725KAYDD3 features an active-low open-drain RST output capable of sinking ≥3.2mA at VCC1 ≥4.5V (VOL ≤0.4V). It requires an external pullup resistor to VCC1 or another logic rail. This configuration supports wired-OR reset buses, level translation, and compatibility with µPs having bidirectional reset pins - unlike push-pull variants such as MAX6726KAYDD3.
Is MAX6725KAYDD3 qualified for automotive applications?
MAX6725KAYDD3 is specified for -40°C to +125°C operation and tested per AEC-Q100 stress requirements for temperature cycling, HTOL, and ESD. While not officially AEC-Q100 certified, its design, characterization, and packaging meet key automotive reliability benchmarks - making it widely deployed in ADAS camera modules, infotainment power domains, and body control units where extended temperature operation is mandatory.
MAX6725KAYDD3 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:
- 0.788V, 2.188V, Adj
- Output:
- Open Drain, Open Drain
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6725KAYDD3 FAQ
1.How can I place an order for MAX6725KAYDD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725KAYDD3 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 MAX6725KAYDD3 reliable?
The price and inventory of MAX6725KAYDD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725KAYDD3 is usually 5 days.
3.What payment methods are accepted for MAX6725KAYDD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725KAYDD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725KAYDD3?
MAX6725KAYDD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725KAYDD3 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 MAX6725KAYDD3?
For technical support, including MAX6725KAYDD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725KAYDD3 requirements.
6.How does Aetrix verify that MAX6725KAYDD3 is sourced from the original manufacturer or authorized distributors?
All MAX6725KAYDD3 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 MAX6725KAYDD3 meets industry standards.
7.What is the process for return or replacement of MAX6725KAYDD3?
All MAX6725KAYDD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725KAYDD3, 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 MAX6725KAYDD3 part is unused and in its original packaging.
Return procedure for MAX6725KAYDD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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