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Analog Devices Inc./Maxim Integrated MAX6725KAZGD3+
- Part No.:
- MAX6725KAZGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725KAZGD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6725KAZGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (1.8V–5.0V), VCC2 (0.9V–3.3V), and an externally adjustable RSTIN input (down to 0.626V). It provides dual active-low reset outputs (RST1 open-drain, RST2 push-pull), manual reset input, watchdog timer with 35s startup/1.12s normal timeout, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V. Used in multivoltage telecom and industrial systems for reliable power sequencing and fault detection.
For engineers reviewing the MAX6725KAZGD3+ datasheet, MAX6725KAZGD3+ pinout, MAX6725KAZGD3+ application, or MAX6725KAZGD3+ equivalent, key selection criteria include its dual-reset-output architecture, factory-trimmed dual-threshold monitoring, 210ms (min) reset timeout, 14µA typical supply current at 3.6V, and support for auxiliary voltage supervision via RSTIN with 626mV internal reference.
Technical Context
The MAX6725KAZGD3+ integrates three independent voltage monitors: primary (VCC1), secondary (VCC2), and auxiliary (RSTIN), each with dedicated comparators and hysteresis. Its dual reset outputs are functionally isolated-RST1 referenced to VCC1 (open-drain), RST2 referenced to VCC2 (push-pull)-enabling independent reset control of core and I/O domains.
It implements a dual-mode watchdog: a 35s minimum initial timeout after any reset event (power-up, MR, or watchdog-triggered), followed by a 1.12s minimum normal timeout upon first WDI transition. Reset assertion is latched for a minimum 210ms timeout period, with immunity to sub-20µs VCC transients when overdrive exceeds 100mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.250V (typ), factory-trimmed Z-suffix; ensures reliable reset assertion during 2.5V core rail brownout |
| VCC2 Threshold | 2.313V (typ), factory-trimmed Z-suffix; matches common 2.5V I/O supply monitoring |
| RSTIN Threshold | 626.5mV (typ), internal reference; enables precise third-rail monitoring via resistor divider |
| Reset Timeout | 210ms (min), D3-suffix; provides sufficient hold time for slow-starting DC/DC converters |
| Supply Current | 14µA (typ) at 3.6V; minimizes quiescent load on battery-backed or low-power systems |
| Operating Temp | -40°C to +85°C; qualified for industrial-grade embedded equipment deployment |
| Watchdog Timeout | 1.12s (min) normal mode; detects firmware hangs without excessive latency |
Pinout & Package
MAX6725KAZGD3+ is housed in an 8-pin SOT23 package (3.0mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and telecom equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low open-drain reset output referenced to VCC1; requires external pullup for µP reset signaling |
| 2 | GND | Analog/digital ground reference; must be low-impedance connection to system ground plane |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; debounced by 1µs pulse width requirement |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V); powers internal VCC2 monitor and references RST2 output |
| 5 | RSTIN/PFI | Shared pin: selectable as adjustable reset input (RSTIN) or power-fail input (PFI); 626.5mV internal reference |
| 6 | WDI | Watchdog input; resets internal timer on rising/falling edge; immune to noise with 100ns glitch rejection |
| 7 | VCC1 | Primary supply input (1.8V–5.0V); powers device core and references RST1 output |
| 8 | RST2 | Active-low push-pull reset output referenced to VCC2; drives loads directly without pullup resistor |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST1 (open-drain, VCC1-referenced) and RST2 (push-pull, VCC2-referenced) enable simultaneous but isolated reset control of processor core and peripheral domains |
| Triple-voltage monitoring | Monitors VCC1, VCC2, and RSTIN with factory-trimmed thresholds and 20ppm/°C tempco for stable operation across temperature |
| Configurable watchdog timer | 35s startup timeout allows full system boot before watchdog enforcement; 1.12s normal timeout ensures rapid hang detection during runtime |
| Guaranteed reset validity to 0.8V | Ensures clean reset assertion even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V |
| Low-power operation | 14µA typical ICC at 3.6V enables use in always-on, battery-powered applications without significant standby drain |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Monitoring |
|---|---|
Use Scenario: Managing power-up sequence of FPGA, DSP, and analog front-end in a 4G baseband unit with 1.2V, 2.5V, and 3.3V rails. IC Role / Device Role / Timing Role: MAX6725KAZGD3+ asserts RST1 on VCC1 (3.3V) and RST2 on VCC2 (2.5V) independently, ensuring proper domain isolation and staggered release timing. Use Value: Prevents metastability and latch-up by enforcing correct voltage ramp order and holding reset until all rails stabilize above their trimmed thresholds. | Use Scenario: Supervising redundant 24V DC input and isolated 5V/3.3V logic supplies in an industrial programmable logic controller. IC Role / Device Role / Timing Role: MAX6725KAZGD3+ uses RSTIN to monitor auxiliary 24V rail via resistor divider while VCC1/VCC2 track internal logic supplies. Use Value: Enables early warning of main power degradation before critical logic rails collapse, allowing graceful shutdown via PFO-triggered interrupt. |
| Portable Medical Device Boot | Battery-Powered IoT Node |
Use Scenario: Ensuring reliable boot of ARM Cortex-M4 MCU and sensor hub in a handheld ultrasound probe powered by Li-ion battery. IC Role / Device Role / Timing Role: MAX6725KAZGD3+ monitors battery-derived 3.3V (VCC1), regulated 1.8V core (VCC2), and buck converter feedback node (RSTIN) for real-time rail health. Use Value: Dual reset outputs allow separate reset hold times for MCU and analog subsystems, improving functional safety compliance. | Use Scenario: Supervising ultra-low-power BLE SoC (1.8V), RF front-end (3.0V), and coin-cell backup (3.3V) in a wireless sensor node. IC Role / Device Role / Timing Role: MAX6725KAZGD3+ leverages 14µA supply current and RSTIN monitoring to extend battery life while detecting weak cell voltage before system failure. Use Value: 210ms reset timeout accommodates slow LDO startup; low ICC avoids premature battery depletion during extended sleep cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KAZGD3+ | Single push-pull RST output (no RST1 open-drain); identical VCC1/VCC2/RSTIN thresholds and timeout | Lacks independent open-drain reset for legacy µP interfaces requiring external pullup | Select MAX6726KAZGD3+ only if system uses only one reset domain and push-pull drive suffices |
| TPS3808G33DBVR | Dual-supply monitor only (no RSTIN); fixed 3.3V VDD threshold; 200ms timeout; 2.5µA ICC | No auxiliary voltage monitoring or watchdog; lower supply current but reduced feature set | Choose TPS3808G33DBVR for cost-sensitive, single-rail applications where RSTIN and WDI are unnecessary |
Compared with MAX6726KAZGD3+, MAX6725KAZGD3+ adds RST1 open-drain output for flexible µP interface compatibility; versus TPS3808G33DBVR, it supports triple-rail monitoring and watchdog functionality at higher ICC but broader system coverage.
Availability
MAX6725KAZGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, portable medical devices, and battery-powered IoT nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6725KAZGD3+ 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 industrial, automotive, communications, and computing markets.
The MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervisory circuits targeting space- and power-constrained embedded systems requiring robust power-on reset, brownout protection, and watchdog supervision.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6725KAZGD3+?
The MAX6725KAZGD3+ has a factory-trimmed VCC1 reset threshold of 2.250V (typical), with min/max values of 2.188V and 2.313V across temperature and process variation. This Z-suffix threshold is specified in the Reset Voltage Threshold Suffix Guide and applies under standard operating conditions (TA = -40°C to +85°C, VCC1 = 0.8V to 5.5V).
Does the MAX6725KAZGD3+ support both open-drain and push-pull reset outputs simultaneously?
Yes, the MAX6725KAZGD3+ provides two independent reset outputs: Pin 1 (RST1) is open-drain referenced to VCC1, and Pin 8 (RST2) is push-pull referenced to VCC2. This dual-output architecture allows concurrent reset signaling to different voltage domains without external level-shifting components.
How does the watchdog timer operate on the MAX6725KAZGD3+?
The MAX6725KAZGD3+ implements a dual-mode watchdog: after any reset event, it enters a 35s minimum startup timeout to allow full system initialization; upon first valid WDI edge, it switches to a 1.12s minimum normal timeout. The timer resets on any rising or falling edge at WDI (Pin 6), and asserts RST1/RST2 if no transition occurs within the active timeout window.
Can the RSTIN pin on the MAX6725KAZGD3+ be used for power-fail detection?
No - the MAX6725KAZGD3+ does not support RSTIN as a power-fail input. Per the Selector Guide and Pin Description, MAX6725 includes RSTIN (not PFI), and lacks the PFO output required for power-fail signaling. For power-fail capability, select MAX6728 or MAX6729 instead.
What is the recommended external pullup resistor value for the RST1 output of the MAX6725KAZGD3+?
A 10kΩ to 100kΩ pullup resistor to VCC1 is recommended for the RST1 (Pin 1) open-drain output of the MAX6725KAZGD3+. Typical design uses 47kΩ to balance rise time (≤1µs with 10pF load) and current draw (<100µA at 3.3V), while maintaining noise immunity in industrial environments.
MAX6725KAZGD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.11V, 2.313V, Adj
- Output:
- Open Drain, Open Drain
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6725KAZGD3+ FAQ
1.How can I place an order for MAX6725KAZGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725KAZGD3+ 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 MAX6725KAZGD3+ reliable?
The price and inventory of MAX6725KAZGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725KAZGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6725KAZGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725KAZGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725KAZGD3+?
MAX6725KAZGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725KAZGD3+ 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 MAX6725KAZGD3+?
For technical support, including MAX6725KAZGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725KAZGD3+ requirements.
6.How does Aetrix verify that MAX6725KAZGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6725KAZGD3+ 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 MAX6725KAZGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6725KAZGD3+?
All MAX6725KAZGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725KAZGD3+, 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 MAX6725KAZGD3+ part is unused and in its original packaging.
Return procedure for MAX6725KAZGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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