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Analog Devices Inc./Maxim Integrated MAX6725AKASYD3+
- Part No.:
- MAX6725AKASYD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725AKASYD3+.pdf
- Description:
- POWER MANAGEMENT CIRCUIT, BICMOS
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX6725AKASYD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory IC in 8-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, active-low open-drain RST output, manual-reset input, and watchdog disable capability - used in telecom power management to ensure reliable µP boot under brownout conditions.
For engineers reviewing the MAX6725AKASYD3+ datasheet, MAX6725AKASYD3+ pinout, MAX6725AKASYD3+ application, or MAX6725AKASYD3+ equivalent, key selection factors include guaranteed reset validity down to VCC = 0.8V, 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and support for triple-voltage monitoring via external RSTIN divider.
Technical Context
This device implements dual independent voltage comparators with factory-trimmed thresholds (VTH1 = 4.625V, VTH2 = 3.075V), a 210ms minimum reset timeout timer, and an internal 50kΩ pullup on MR. It asserts RST low when either supply drops below its threshold or MR is pulled low, holding reset for the full timeout after recovery.
The MAX6725AKASYD3+ uses open-drain RST output referenced to VCC1, supports watchdog disable via unconnected WDI (200nA detection current), and guarantees valid reset logic state as long as VCC1 or VCC2 remains ≥0.8V - enabling operation during deep brownout without external biasing.
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 monitoring |
| VCC2 Threshold | 3.075V (factory-trimmed, ±75mV tolerance) - sets secondary supply detection for 3.3V I/O rail supervision |
| Reset Timeout | 210ms (minimum) - ensures µP reset pulse exceeds boot ROM initialization time in telecom baseband processors |
| Supply Current | 14µA (typ at 3.6V) - enables battery-backed operation for >10 years in always-on network edge devices |
| Reset Validity | Down to VCC1 or VCC2 = 0.8V - maintains deterministic reset assertion during severe undervoltage events |
| MR Input | Active-low with 50kΩ internal pullup to VCC1 - eliminates external resistor for manual reset button interface |
| VCC Transient Immunity | Immune to <20µs negative glitches (at 100mV overdrive) - prevents spurious resets from switching noise on DC-DC outputs |
Pinout & Package
Package: 8-pin SOT23 (3.0mm × 1.6mm × 1.1mm, 0.65mm pitch). RoHS-compliant, lead-free, tape-and-reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output - requires external pullup; asserts when VCC1/VCC2 drop below threshold or MR is pulled low |
| 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 with 50kΩ internal pullup to VCC1 - momentary switch to GND initiates system reset |
| 4 | VCC2 | Secondary supply input (powers internal circuitry when >VCC1) - monitors 3.075V threshold for 3.3V rail |
| 5 | VCC1 | Primary supply input (powers device when >VCC2) - monitors 4.625V threshold for 5V rail |
| 6 | RSTIN | Adjustable reset comparator input (626mV internal reference) - connects to resistor divider for third-voltage monitoring down to 0.62V |
| 7 | WDI | Watchdog input - left unconnected to disable watchdog; 200nA detection current prevents false enable from floating nodes |
| 8 | PFO | Active-low power-fail output (open-drain) - asserts when PFI < 626mV; not present on MAX6725A variant per datasheet pin mapping |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of 5V (VCC1) and 3.3V (VCC2) rails with separate thresholds and hysteresis - eliminates need for two discrete supervisors |
| Factory-trimmed precision thresholds | VTH1 = 4.625V ±125mV, VTH2 = 3.075V ±75mV - removes calibration overhead in high-volume telecom equipment manufacturing |
| Guaranteed reset validity at low VCC | Operates correctly with VCC1 or VCC2 ≥ 0.8V - enables robust reset assertion during deep brownout without external level-shifting |
| Low-power supervision | 14µA typical ICC at 3.6V - extends battery life in portable network analyzers and remote IoT gateways |
| Manual-reset with integrated pullup | 50kΩ internal MR pullup to VCC1 - reduces BOM count by eliminating external resistor for pushbutton reset circuits |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring primary 5V and secondary 3.3V rails in LTE base station RF front-end power modules during cold start and brownout recovery. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RST to ARM Cortex-A9 processor until both rails stabilize above 4.625V and 3.075V for ≥210ms. Use Value: Prevents processor lockup during partial power-up by enforcing strict sequencing compliance per 3GPP TS 36.104 power integrity requirements. | Use Scenario: Ensuring deterministic reset of safety-critical PLC main CPU during AC line sags in factory automation cabinets. IC Role / Device Role / Timing Role: Supervising 24V-to-5V DC-DC output (VCC1) and isolated 3.3V I/O rail (VCC2) with manual-reset override for field service diagnostics. Use Value: Guarantees reset assertion even if VCC1 drops to 0.9V during 100ms line sag - meeting IEC 61000-4-11 immunity test criteria. |
| Portable Network Analyzer | Battery-Backed Edge Gateway |
Use Scenario: Maintaining µP reset integrity during Li-ion battery discharge from 4.2V to 3.0V in handheld spectrum analyzers. IC Role / Device Role / Timing Role: Using VCC1 = battery voltage and VCC2 = regulated 3.3V LDO output to detect end-of-life battery condition before brownout. Use Value: 14µA supply current enables >5-year shelf life in storage mode while preserving accurate low-VCC reset behavior. | Use Scenario: Supervising main 12V supply and backup supercapacitor 3.3V rail in smart grid edge gateways during grid outage transitions. IC Role / Device Role / Timing Role: Asserting RST when main supply fails and backup rail drops below 3.075V, triggering controlled firmware save before shutdown. Use Value: 210ms timeout provides sufficient time for NAND flash write completion and RTC register backup before power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726AKASYD3+ | Push-pull RST output (vs. open-drain); identical thresholds, timeout, and pinout | Requires no external pullup; incompatible with bidirectional µP reset pins without series resistor | Select when driving CMOS inputs directly or when board space prohibits external pullup resistor |
| TPS3808G33DBVR | Single-supply (3.3V only), no VCC2 input; 200ms timeout; 2.5µA supply current | Lacks dual-rail monitoring; suitable only for single-rail systems with ultra-low quiescent current priority | Select only for cost-sensitive single-voltage applications where 3.3V rail supervision suffices |
Compared with MAX6726AKASYD3+, the MAX6725AKASYD3+ offers open-drain flexibility for shared reset buses but requires external pullup; versus TPS3808G33DBVR, it provides true dual-rail supervision essential for mixed-voltage telecom systems, albeit at higher quiescent current.
Availability
MAX6725AKASYD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable test equipment requiring stable component supply across extended temperature (-40°C to +125°C) and long-lifecycle programs.
Supply support for MAX6725AKASYD3+ 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 MAX6715A–MAX6729A family delivers ultra-low-voltage µP supervision for multirail systems, targeting applications where simultaneous monitoring of primary and secondary supplies is critical to system reliability.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6725AKASYD3+?
The MAX6725AKASYD3+ has a factory-trimmed VCC1 reset threshold of 4.625V (minimum 4.500V, maximum 4.750V) with ±0.5% hysteresis. This value is fixed by the "K" and "A" suffixes in the part number per Maxim's Reset Voltage Threshold Suffix Guide and applies across the full -40°C to +125°C operating range.
Does the MAX6725AKASYD3+ support triple-voltage monitoring?
Yes, the MAX6725AKASYD3+ supports triple-voltage monitoring via its RSTIN pin, which features a 626mV internal reference. By connecting an external resistor divider to RSTIN, designers can monitor a third supply down to 0.62V - confirmed in the datasheet's Adjustable Reset Comparator Input section and Figure 1.
What is the function of Pin 8 (PFO) on the MAX6725AKASYD3+?
Pin 8 (PFO) is not implemented on the MAX6725AKASYD3+. Per the Pin Description table (page 7), PFO is only present on MAX6728A/MAX6729A/MAX6797A variants. The MAX6725A pinout omits PFO - confirmed by absence in the MAX6725A column of the pin-function matrix and lack of PFO electrical characteristics in its parameter tables.
How is the watchdog timer disabled on the MAX6725AKASYD3+?
The watchdog timer on the MAX6725AKASYD3+ is disabled by leaving the WDI pin (Pin 7) unconnected. The device uses a 200nA internal current source to detect the unconnected state - verified in the Watchdog Input section (page 8) and Functional Description (page 11). Connecting WDI to any node sourcing >50nA may unintentionally enable the watchdog.
What package type and dimensions does the MAX6725AKASYD3+ use?
The MAX6725AKASYD3+ uses an 8-pin SOT23 package measuring 3.0mm × 1.6mm × 1.1mm with 0.65mm lead pitch. This is confirmed in the Ordering Information table (page 1) and Absolute Maximum Ratings (page 2), where the 8-pin SOT23 variant is explicitly listed for MAX6725A devices.
MAX6725AKASYD3+ 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, Open Drain
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6725AKASYD3+ FAQ
1.How can I place an order for MAX6725AKASYD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725AKASYD3+ 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 MAX6725AKASYD3+ reliable?
The price and inventory of MAX6725AKASYD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725AKASYD3+ is usually 5 days.
3.What payment methods are accepted for MAX6725AKASYD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725AKASYD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725AKASYD3+?
MAX6725AKASYD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725AKASYD3+ 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 MAX6725AKASYD3+?
For technical support, including MAX6725AKASYD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725AKASYD3+ requirements.
6.How does Aetrix verify that MAX6725AKASYD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6725AKASYD3+ 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 MAX6725AKASYD3+ meets industry standards.
7.What is the process for return or replacement of MAX6725AKASYD3+?
All MAX6725AKASYD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725AKASYD3+, 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 MAX6725AKASYD3+ part is unused and in its original packaging.
Return procedure for MAX6725AKASYD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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