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Analog Devices Inc./Maxim Integrated MAX6725AKASHD3+
- Part No.:
- MAX6725AKASHD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725AKASHD3+.pdf
- Description:
- MAX6725 TRIPLE, ULTRA-LOW-VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:1,525
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Product details
Overview
The MAX6725AKASHD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit 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. It guarantees valid reset assertion down to VCC1 or VCC2 = 0.8V and draws only 14µA typical supply current at 3.6V - used in telecom power sequencing and industrial embedded controllers requiring reliable brownout detection.
For engineers reviewing the MAX6725AKASHD3+ datasheet, MAX6725AKASHD3+ pinout, MAX6725AKASHD3+ application, or MAX6725AKASHD3+ equivalent, key selection factors include its factory-trimmed dual-threshold configuration, 210ms min timeout period, immunity to sub-100ns VCC transients, and compatibility with 1.2V–5.0V core/I/O supply domains in space-constrained designs.
Technical Context
This device implements two independent voltage comparators with hysteresis (0.5% of threshold), a digital timeout counter triggered on any threshold violation, and a manual-reset latch with 200ns propagation delay. The reset logic remains valid across -40°C to +125°C while either VCC1 or VCC2 exceeds 0.8V, enabling operation during deep brownout conditions.
The MAX6725AKASHD3+ integrates a watchdog timer with 35s startup delay and 1.12s normal-mode timeout, but the WDI pin is internally disabled per suffix 'K' - eliminating external timing dependencies. Its RST output is open-drain, requiring an external pullup, and MR features a 50kΩ internal pullup to VCC1 for direct pushbutton interfacing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% tolerance) - sets primary supply monitoring point for 5V/4.8V rails |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% tolerance) - monitors secondary 3.3V I/O supply with guaranteed validity down to 0.8V |
| Reset Timeout | 210ms (minimum) - ensures µP completes boot sequence before releasing reset |
| Supply Current | 14µA typical at 3.6V - enables battery-backed operation for >10 years in low-power systems |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Reset Propagation | 20µs max VCC-to-RST delay - provides fast response to supply collapse without false triggering |
| MR Input Logic | Active-low with 0.3×VCC1 VIH/0.7×VCC1 VIL - compatible with CMOS and open-drain drivers |
Pinout & Package
Package: 8-pin SOT23 (3.0mm × 1.6mm × 1.1mm height), RoHS-compliant, tape-and-reel.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output - requires external pullup; asserts when VCC1/VCC2 drop below thresholds or MR is pulled low |
| 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 - 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 present on MAX6725A); monitors 0.9V–3.3V rails |
| 5 | VCC1 | Primary supply input - powers device core and sets RST1 reference; supports 1.8V–5.0V operation with reset valid down to 0.8V |
| 6 | RSTIN | Adjustable reset input - high-impedance node referenced to 626mV internal bandgap; unused pins must connect to VCC1 or VCC2 |
| 7 | PFI | Power-fail input - monitors auxiliary supply via resistor divider; threshold = 626.5mV typical; connects to GND if unused |
| 8 | PFO | Active-low power-fail output - open-drain, referenced to VCC1; asserts independently of reset timeout for early warning shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed thresholds | VCC1 = 4.625V, VCC2 = 3.075V - eliminates external resistor networks and calibration effort for standard 5V/3.3V systems |
| 210ms reset timeout | Guaranteed minimum duration - ensures sufficient hold time for FPGA configuration or bootloader execution before release |
| 0.8V reset validity limit | Operates with VCC1 or VCC2 ≥ 0.8V - maintains supervision during severe brownout where other supervisors fail |
| 14µA supply current | Typical ICC at 3.6V - reduces quiescent power in always-on subsystems such as RTC or sensor hubs |
| MR with 50kΩ internal pullup | Enables direct pushbutton-to-GND interface - no external resistor needed for manual reset functionality |
| Immunity to 100ns VCC glitches | Rejects transients ≤100ns at 100mV overdrive - prevents spurious resets in noisy switching power supply environments |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Dual-rail DC-DC converter startup in 48V-powered base station equipment with strict sequencing between 5V management rail and 3.3V FPGA I/O rail. IC Role / Device Role / Timing Role: Supervisory IC asserting reset until both VCC1 (5V) and VCC2 (3.3V) stabilize above 4.625V and 3.075V respectively, then holding reset for 210ms. Use Value: Prevents FPGA configuration corruption by ensuring power rails settle fully before release - eliminates field failures due to marginal sequencing margins. |
Use Scenario: Embedded controller in programmable logic controller monitoring 24V backplane supply (VCC1) and isolated 3.3V logic supply (VCC2) in harsh factory environments. IC Role / Device Role / Timing Role: Dual-supply monitor with manual-reset button interface (MR) and extended temperature support (-40°C to +125°C). Use Value: Guarantees reset assertion even during 24V rail sag to 0.8V - enables safe recovery after momentary brownout without firmware intervention. |
| Medical Diagnostic Imaging | Automotive ADAS Camera Module |
Use Scenario: High-reliability imaging subsystem requiring coordinated reset of FPGA, ADC, and memory interfaces powered from separate LDOs. IC Role / Device Role / Timing Role: Centralized reset generator using RST open-drain output with shared pullup to enable OR-ing with other system reset sources. Use Value: 210ms timeout accommodates slow-starting analog front-end LDOs while 14µA quiescent current minimizes standby drain on backup battery. |
Use Scenario: Vision processing module in rear-view camera system with 5V camera sensor rail (VCC1) and 3.3V SoC core rail (VCC2), operating under automotive temperature extremes. IC Role / Device Role / Timing Role: AEC-Q200–capable supervisory IC providing fault detection and manual reset via vehicle UI button (MR). Use Value: Valid reset down to 0.8V ensures supervision remains active during cold-crank events where battery dips to 6V - critical for ASIL-B compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726AKASHD3+ | Push-pull RST output instead of open-drain; identical thresholds, timeout, and pinout | Eliminates need for external pullup resistor; not suitable for wired-OR reset bus configurations | Select when driving single-load reset line directly into µP reset pin without bus sharing |
| TPS3808G33DBVR | Single-supply (3.3V only), 200ms timeout, 1.6µA IQ, SOT23-6 package | Lacks VCC2 monitoring and MR input; lower quiescent current but no triple-voltage flexibility | Select for cost-sensitive, single-rail applications where dual monitoring is unnecessary |
Compared with MAX6726AKASHD3+, the MAX6725AKASHD3+ enables reset bus sharing via open-drain topology, while TPS3808G33DBVR reduces BOM count in simple 3.3V-only systems but sacrifices dual-rail supervision and manual reset capability.
Availability
MAX6725AKASHD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, medical imaging subsystems, and automotive ADAS modules requiring stable component supply with full lifecycle support.
Supply support for MAX6725AKASHD3+ 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 environments.
The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits optimized for dual/triple supply monitoring in space-constrained, high-reliability systems - targeting telecom, industrial, and automotive applications where brownout resilience is critical.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6725AKASHD3+?
The MAX6725AKASHD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over temperature. These values are fixed by the 'AS' suffix per Maxim's Reset Voltage Threshold Suffix Guide and do not require external resistor programming - enabling plug-and-play integration in 5V/3.3V systems without calibration.
Does the MAX6725AKASHD3+ include a functional watchdog timer?
No, the MAX6725AKASHD3+ watchdog function is disabled. The 'K' suffix in the part number explicitly denotes watchdog disable - meaning the WDI pin is internally disconnected and the watchdog timer circuitry is inactive. This eliminates timing dependencies and simplifies firmware design while retaining full dual-supply monitoring and manual reset capability.
What is the purpose of the RSTIN pin on the MAX6725AKASHD3+?
The RSTIN pin on the MAX6725AKASHD3+ is a high-impedance adjustable reset input referenced to a 626mV internal bandgap. When used, it enables monitoring of a third supply voltage (down to 0.62V) via an external resistor divider. If unused, RSTIN must be tied to VCC1 or VCC2 - floating connections are prohibited per datasheet guidelines.
Can the MAX6725AKASHD3+ operate with VCC1 below 1.8V?
Yes, the MAX6725AKASHD3+ guarantees valid reset output logic state with VCC1 or VCC2 as low as 0.8V. While VCC1 nominal range is 1.8V–5.0V, the device continues asserting reset correctly during deep brownout conditions - a key differentiator for automotive cold-crank and industrial brownout resilience applications.
What package type and dimensions does the MAX6725AKASHD3+ use?
The MAX6725AKASHD3+ uses an 8-pin SOT23 package measuring 3.0mm × 1.6mm × 1.1mm (L × W × H), with lead-free/RoHS-compliant finish and tape-and-reel packaging. This compact footprint supports high-density PCB layouts in telecom modules and portable medical devices where board space is constrained.
MAX6725AKASHD3+ 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:
- 1.313V, 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
MAX6725AKASHD3+ FAQ
1.How can I place an order for MAX6725AKASHD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725AKASHD3+ 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 MAX6725AKASHD3+ reliable?
The price and inventory of MAX6725AKASHD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725AKASHD3+ is usually 5 days.
3.What payment methods are accepted for MAX6725AKASHD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725AKASHD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725AKASHD3+?
MAX6725AKASHD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725AKASHD3+ 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 MAX6725AKASHD3+?
For technical support, including MAX6725AKASHD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725AKASHD3+ requirements.
6.How does Aetrix verify that MAX6725AKASHD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6725AKASHD3+ 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 MAX6725AKASHD3+ meets industry standards.
7.What is the process for return or replacement of MAX6725AKASHD3+?
All MAX6725AKASHD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725AKASHD3+, 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 MAX6725AKASHD3+ part is unused and in its original packaging.
Return procedure for MAX6725AKASHD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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