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Analog Devices Inc./Maxim Integrated MAX6725AKASYD3+T
- Part No.:
- MAX6725AKASYD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725AKASYD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
The MAX6725AKASYD3+T from Maxim Integrated is a dual-supply microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V) with factory-trimmed reset thresholds, 140ms minimum reset timeout, push-pull active-low RST output, manual-reset input (MR), and watchdog disable capability. It ensures reliable system reset during brownouts in telecom power systems and industrial controllers.
For engineers reviewing the MAX6725AKASYD3+T datasheet, MAX6725AKASYD3+T pinout, MAX6725AKASYD3+T application, or MAX6725AKASYD3+T equivalent, key selection criteria include dual-voltage monitoring range, guaranteed reset validity down to 0.8V on either supply, low 14µA typical supply current at 3.6V, and compatibility with manual-reset and watchdog-free operation in space-constrained embedded designs.
Technical Context
The MAX6725AKASYD3+T implements independent voltage comparators for VCC1 and VCC2, each with ±0.5% hysteresis and 20ppm/°C tempco, asserting reset when either supply falls below its factory-set threshold (e.g., VTH1 = 2.925V typ, VTH2 = 1.110V typ). Reset remains asserted for a fixed 140ms minimum timeout after both supplies recover.
It features a CMOS-compatible manual-reset input (MR) with internal 50kΩ pullup to VCC1, 1µs minimum pulse width requirement, and 200ns MR-to-reset delay; the RST output is push-pull, referenced to VCC1, with VOL ≤ 0.3V at ISINK = 1.2mA and VOH ≥ 0.8×VCC1 at ISOURCE = 500µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Range | 0.8V to 5.5V - supports primary supply monitoring from ultra-low-voltage logic rails up to 5V systems |
| VCC2 Range | 0.8V to 5.5V - enables secondary supply supervision including sub-1V core voltages |
| Reset Timeout | 140ms (min) - provides sufficient hold time for processor initialization and memory stabilization |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent power in battery-backed or energy-sensitive applications |
| Reset Threshold Accuracy | ±0.5% hysteresis, 20ppm/°C tempco - ensures stable trip points across automotive and industrial temperature ranges |
| MR Input Logic | Active-low with 0.3×VCC1 VIH/0.7×VCC1 VIL - compatible with standard CMOS I/O without level-shifting |
| RST Output Type | Push-pull, active-low - eliminates need for external pullup and drives directly into µP reset pins |
Pinout & Package
MAX6725AKASYD3+T is housed in an 8-pin SOT23 package (package code K8SN+1, outline 21-0078), with thermal resistance θJA = 180°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2 drop below thresholds or MR is pulled low |
| 2 | GND | System ground reference for all internal comparators and output drivers |
| 3 | MR | Active-low manual-reset input with internal 50kΩ pullup to VCC1; initiates reset on logic-low pulse ≥1µs |
| 4 | VCC2 | Secondary supply input powering internal VCC2 comparator and enabling dual-rail monitoring |
| 5 | VCC1 | Primary supply input powering device core and defining RST output voltage reference |
| 6 | RST2 | Active-low push-pull reset output referenced to VCC2 - provides independent reset signaling tied to secondary rail |
| 7 | PFO | Active-low power-fail output (push-pull) asserted when PFI < 626.5mV; deasserts immediately without timeout |
| 8 | PFI | Power-fail input comparator noninverting terminal; monitors auxiliary supply via resistor divider with 626.5mV internal reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 (1.58V–4.63V thresholds) and VCC2 (0.79V–3.08V thresholds) with separate comparators and hysteresis |
| Guaranteed reset validity | Reset output remains logically valid even when VCC1 or VCC2 drops to 0.8V - critical for graceful shutdown in brownout conditions |
| Immunity to short VCC transients | Withstands negative-going supply glitches ≤20µs at 100mV overdrive - prevents spurious resets during switching noise |
| Low-power operation | 14µA typical ICC at 3.6V enables use in always-on subsystems and battery-buffered controllers without significant drain |
| Manual-reset integration | Internal 50kΩ MR pullup eliminates external components; supports direct switch-to-ground connection with no debounce required |
Applications
| Telecom Power Management | Industrial PLC Controllers |
|---|---|
Use Scenario: Monitoring dual DC-DC outputs (e.g., +3.3V control rail and +1.2V FPGA core rail) in 48V-powered base station power modules. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting synchronized reset if either rail dips during load transients or hot-swap events. Use Value: Prevents firmware corruption by ensuring µP remains held in reset until both supplies stabilize post-transient, leveraging 140ms timeout and 0.8V reset validity. |
Use Scenario: Supervising main 24V DC input and isolated 5V logic supply in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Providing fail-safe reset coordination between field I/O power and CPU domain, with MR support for emergency operator-initiated restart. Use Value: Enables deterministic recovery from undervoltage faults while maintaining compatibility with legacy 24V industrial interfaces via push-pull RST output. |
| Network Switch ASIC Power Sequencing | Medical Diagnostic Imaging Subsystem |
Use Scenario: Coordinating power-up sequencing and brownout detection for multi-rail ASICs (1.8V I/O, 1.0V core, 3.3V PHY) in enterprise switches. IC Role / Device Role / Timing Role: Dual-monitoring IC verifying VCC1 (1.8V) and VCC2 (3.3V) before releasing ASIC reset, with PFI used to monitor auxiliary 12V bias supply. Use Value: Eliminates need for discrete comparators and timers, reducing BOM count and PCB area while meeting IEC 61000-4-4 EFT immunity requirements via glitch-immune design. |
Use Scenario: Ensuring safe power-down sequence in MRI gradient amplifier modules where 5V control and ±15V analog supplies must remain within tolerance. IC Role / Device Role / Timing Role: Supervising primary 5V logic rail and secondary ±15V analog supply (via VCC2 input), triggering controlled shutdown before analog rail collapse. Use Value: Guarantees reset assertion down to 0.8V on either supply - essential for detecting partial failures in redundant power paths without false positives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726AKASYD3+T | Identical pinout and electrical specs, but features active-high RST output instead of active-low | Required when host µP accepts only active-high reset assertion (e.g., certain ARM Cortex-M bootloaders) | Select MAX6726AKASYD3+T only when active-high logic polarity is mandatory; otherwise MAX6725AKASYD3+T offers broader µP compatibility |
| TPS3808G33DBVR | Single-supply (3.3V only), 200ms timeout, open-drain RST, no MR or PFI/PFO functions | Limited to single-rail monitoring; lacks manual reset and power-fail alert capability | Use TPS3808G33DBVR only in cost-sensitive, single-voltage applications where dual monitoring and auxiliary features are unnecessary |
Compared with MAX6726AKASYD3+T and TPS3808G33DBVR, the MAX6725AKASYD3+T uniquely delivers dual-rail supervision with manual reset, power-fail monitoring, and push-pull active-low reset in one 8-pin SOT23 - making it optimal for compact, feature-rich embedded systems requiring coordinated multi-supply fault response.
Availability
MAX6725AKASYD3+T is available at Aetrix Electronics and suitable for telecom power management, industrial PLC controllers, and network switch ASIC power sequencing requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned reliability.
Supply support for MAX6725AKASYD3+T 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, emphasizing high reliability and low power.
The MAX6715A–MAX6729A family was engineered specifically for multivoltage embedded systems needing robust, space-efficient power supervision with guaranteed operation down to 0.8V - targeting telecom infrastructure, industrial automation, and medical electronics.
FAQ
What is the reset timeout period for MAX6725AKASYD3+T?
The MAX6725AKASYD3+T has a fixed minimum reset timeout period of 140ms (suffix D3). This duration begins when VCC1 and VCC2 rise above their respective thresholds and ensures the microprocessor remains held in reset long enough for stable clock acquisition and memory initialization before release. The actual timeout may vary slightly with temperature and supply voltage but remains ≥140ms across -40°C to +125°C.
Does MAX6725AKASYD3+T support manual reset functionality?
Yes, MAX6725AKASYD3+T includes an active-low manual-reset input (MR) on Pin 3 with an internal 50kΩ pullup resistor to VCC1. Pulling MR low for ≥1µs forces an immediate reset assertion, which persists for the full 140ms timeout period after MR returns high. This allows field technicians or system logic to initiate controlled restarts without cycling main power.
Can MAX6725AKASYD3+T monitor three voltage rails?
No, MAX6725AKASYD3+T is a dual-supply supervisor monitoring only VCC1 and VCC2. While the MAX6725A variant family includes RSTIN/PFI pins, the MAX6725AKASYD3+T does not implement RSTIN functionality - that feature is reserved for MAX6723A–MAX6727A variants. For triple-voltage monitoring, consider MAX6727AKASYD3+T instead.
What is the operating temperature range of MAX6725AKASYD3+T?
The MAX6725AKASYD3+T is rated for continuous operation from -40°C to +125°C ambient temperature. This extended industrial grade range is validated per the device's Absolute Maximum Ratings and Electrical Characteristics tables, making it suitable for under-hood automotive modules, base station RF units, and factory-floor controllers exposed to thermal stress.
Is MAX6725AKASYD3+T RoHS compliant?
Yes, MAX6725AKASYD3+T is RoHS compliant and lead-free. The "+T" suffix in the part number explicitly denotes RoHS-compliant packaging per Maxim Integrated's standard product marking convention. The device meets EU Directive 2011/65/EU and subsequent amendments, with homogeneous material analysis confirming absence of restricted substances above threshold limits.
MAX6725AKASYD3+T 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6725AKASYD3+T FAQ
1.How can I place an order for MAX6725AKASYD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725AKASYD3+T 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+T reliable?
The price and inventory of MAX6725AKASYD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725AKASYD3+T is usually 5 days.
3.What payment methods are accepted for MAX6725AKASYD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725AKASYD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725AKASYD3+T?
MAX6725AKASYD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725AKASYD3+T 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+T?
For technical support, including MAX6725AKASYD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725AKASYD3+T requirements.
6.How does Aetrix verify that MAX6725AKASYD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6725AKASYD3+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX6725AKASYD3+T?
All MAX6725AKASYD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725AKASYD3+T, 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+T part is unused and in its original packaging.
Return procedure for MAX6725AKASYD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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