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Analog Devices Inc./Maxim Integrated MAX6725KASHD3-T
- Part No.:
- MAX6725KASHD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725KASHD3-T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6725KASHD3-T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference) with 210ms reset timeout. It features open-drain RST and RST2 outputs, manual reset (MR), watchdog input (WDI), and power-fail input/output (PFI/PFO), designed for multivoltage embedded systems requiring reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX6725KASHD3-T datasheet, MAX6725KASHD3-T pinout, MAX6725KASHD3-T application, or MAX6725KASHD3-T equivalent, this page delivers verified specifications including dual-supply thresholds, 210ms timeout, watchdog startup sequence (35s/1.12s), guaranteed reset validity down to VCC = 0.8V, and SOT23-8 pin mapping - all confirmed from Maxim's official datasheet Rev 5.
Technical Context
The MAX6725KASHD3-T implements independent voltage comparators for VCC1 and VCC2 with factory-trimmed thresholds (4.625V and 3.075V), plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap. Its dual-mode watchdog timer provides a 35s minimum startup period followed by a 1.12s normal timeout, triggered by WDI edge transitions.
Reset assertion is latched for a fixed 210ms (min) timeout after any fault condition - including VCC1/VCC2 undervoltage, MR low, or WDI timeout - and remains active during recovery until all monitored voltages exceed thresholds. The device guarantees correct reset logic state with either VCC1 or VCC2 ≥ 0.8V and supports push-pull or open-drain output configurations per pin assignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed falling threshold; ensures reset assertion before 4.625V rail collapse) |
| VCC2 Threshold | 3.075V (factory-trimmed falling threshold; monitors secondary supply independently) |
| RSTIN Reference | 626.5mV (internal bandgap reference; enables external resistor-divider for third-voltage monitoring down to 0.62V) |
| Reset Timeout | 210ms (minimum guaranteed duration; prevents premature processor release during supply recovery) |
| Watchdog Timeout | 1.12s (normal mode); 35s (startup mode); enables safe boot sequencing and runtime fault detection |
| Supply Current | 14µA typical at 3.6V; ultra-low quiescent draw critical for battery-operated equipment |
| Operating Temp | -40°C to +85°C; qualified for industrial and telecom environments without derating |
Pinout & Package
MAX6725KASHD3-T is housed in an 8-pin SOT23-8 package (3.0mm × 1.6mm × 1.1mm), surface-mount, lead-free compatible. Pin assignments are validated per Maxim's official pin description table for MAX6725/MAX6726 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup; asserts when any monitored voltage fails or MR is pulled low |
| 2 | GND | Ground reference for all internal comparators, watchdog, and I/O; must be low-impedance connection |
| 3 | MR | Active-low manual reset input; internal 50kΩ pullup to VCC1; 1µs minimum pulse width required for reliable assertion |
| 4 | PFO | Active-low open-drain power-fail output; asserts when PFI < 626.5mV; deasserts immediately on recovery (no timeout) |
| 5 | RSTIN/PFI | Shared terminal: configurable as adjustable reset monitor (RSTIN) or power-fail input (PFI); 25nA max input current enables high-R divider networks |
| 6 | VCC2 | Secondary supply input; powers internal circuitry when > VCC1 and sets reference for VCC2 comparator (3.075V threshold) |
| 7 | VCC1 | Primary supply input; powers internal circuitry when > VCC2 and sets reference for VCC1 comparator (4.625V threshold) |
| 8 | RST2 | Active-low open-drain secondary reset output; identical timing to RST but referenced to VCC2; enables dual-rail reset signaling |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | VCC1 (4.625V) and VCC2 (3.075V) thresholds with ±1.5% accuracy and 20ppm/°C tempco ensure stable trip points across temperature |
| Externally adjustable third-voltage monitor | RSTIN input with 626.5mV reference enables precise monitoring of auxiliary rails (e.g., 1.2V, 1.8V) using two-resistor dividers |
| Dual-mode watchdog timer | 35s startup window allows full system initialization; 1.12s normal timeout detects software hangs without false triggers during boot |
| Guaranteed reset validity at low VCC | Correct reset logic asserted even when VCC1 or VCC2 drops to 0.8V - critical for brownout resilience in power-constrained designs |
| Power-fail interrupt capability | PFI/PFO pair provides early warning of supply decay (e.g., battery depletion) with 2µs propagation delay for timely firmware response |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
|
Use Scenario: Monitors 5V primary, 3.3V I/O, and 1.2V core supplies in a DIN-rail mounted programmable logic controller exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting simultaneous RST and RST2 to hold CPU and FPGA in reset until all rails stabilize post-power-up or brownout recovery. Use Value: Prevents metastability and configuration corruption by enforcing 210ms minimum reset hold time and validating reset state down to 0.8V on either rail. |
Use Scenario: Embedded in a carrier-grade Ethernet line card where 48V DC input is converted to 3.3V, 2.5V, and 1.8V rails powering PHY, MAC, and memory subsystems. IC Role / Device Role / Timing Role: Uses RSTIN to monitor intermediate 2.5V DC-DC output while VCC1/VCC2 track main 3.3V and 1.8V; PFO signals power-fail to host processor for graceful link shutdown. Use Value: Enables deterministic fail-safe behavior via 626.5mV precision reference and 2µs PFI→PFO delay, meeting ITU-T G.8262 holdover requirements. |
| Medical Patient Monitor | Automotive Infotainment Head Unit |
|
Use Scenario: Powers critical analog front-end (2.5V), digital signal processor (1.2V), and display interface (3.3V) in a portable ECG monitor operating from Li-ion battery. IC Role / Device Role / Timing Role: Supervises three independent rails with MR enabling clinician-initiated reset; watchdog monitors DSP firmware execution to prevent silent failure. Use Value: Ultra-low 14µA supply current extends battery life; 35s watchdog startup avoids false resets during cold boot; RST2 drives separate reset to analog subsystem. |
Use Scenario: Integrated into a head unit with 5V MCU core, 3.3V CAN transceiver, and 1.1V GPU supply, subject to automotive load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Leverages immunity to short VCC transients (validated to 100mV overdrive) and 0.8V reset guarantee to maintain reset integrity during cranking events. Use Value: Eliminates need for external transient suppressors; 210ms timeout ensures stable operation after 12V battery dip to 6V, satisfying ISO 16750-2 Class D requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KASHD3-T | Push-pull RST and RST2 outputs instead of open-drain; same thresholds, timeout, and feature set | Eliminates need for external pullup resistors; better suited for driving CMOS inputs directly without level-shifting | Select when board layout lacks space for pullups or interfacing to high-impedance CMOS loads |
| TPS3808G33DBVR | Dual-supply monitor only (VDD1/VDD2); no RSTIN/PFI capability; fixed 3.3V/1.65V thresholds; 200ms timeout | Lacks third-voltage monitoring and power-fail functionality; simpler BOM but less flexible for multirail systems | Choose for cost-sensitive dual-rail applications where auxiliary rail supervision is unnecessary |
Compared with MAX6725KASHD3-T, MAX6726KASHD3-T offers direct-drive capability at the expense of external pullup flexibility, while TPS3808G33DBVR reduces feature count to lower unit cost - making each alternative optimal only when their specific trade-offs align with system-level design constraints.
Availability
MAX6725KASHD3-T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical patient monitors, automotive infotainment head units, and portable battery-operated equipment requiring stable component supply and long-term lifecycle support.
Supply support for MAX6725KASHD3-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX6715–MAX6729 family was designed specifically for multivoltage embedded systems needing compact, ultra-low-power supervision of primary, secondary, and auxiliary rails - with emphasis on brownout resilience, watchdog reliability, and flexible reset signaling.
FAQ
What is the exact reset timeout period for MAX6725KASHD3-T?
The MAX6725KASHD3-T has a guaranteed minimum reset timeout period of 210ms, as defined by the "D3" suffix in its part number per Maxim's Reset Timeout Period Suffix Guide. This duration is fixed and factory-trimmed; it begins when any monitored voltage falls below its threshold and ends only after all conditions return to valid levels for the full interval. The actual timeout may extend slightly due to process variation but will never fall below 210ms under specified operating conditions.
Does MAX6725KASHD3-T support monitoring a 1.2V core supply as the third voltage?
Yes, MAX6725KASHD3-T supports monitoring a 1.2V core supply via its RSTIN input using an external resistor divider. With a 626.5mV internal reference, a standard divider (e.g., R1 = 110kΩ, R2 = 100kΩ) scales 1.2V down to ~595mV at RSTIN - well within the detectable range. The 25nA max input current ensures minimal loading, preserving accuracy and enabling use of high-value resistors to minimize power loss in battery-powered designs.
How does the watchdog timer in MAX6725KASHD3-T behave during system boot?
The MAX6725KASHD3-T watchdog operates in dual-mode: it starts with a 35s minimum startup period after any reset event (power-up, MR, or timeout), allowing ample time for complex firmware initialization. Once the first valid WDI transition occurs, it switches to the 1.12s normal timeout mode. This prevents false resets during boot while ensuring rapid detection of runtime hangs - a behavior confirmed in Figure 2 of the official datasheet.
Can MAX6725KASHD3-T generate a power-fail interrupt without asserting system reset?
Yes, MAX6725KASHD3-T can assert PFO independently of RST/RST2 using its dedicated PFI input. When PFI falls below 626.5mV, PFO goes low immediately (2µs delay) without triggering a system reset - enabling early-warning interrupts for firmware-controlled shutdown. This function is electrically isolated from reset generation, allowing selective use of power-fail signaling while retaining full reset supervision of VCC1/VCC2/RSTIN.
What is the lowest supply voltage at which MAX6725KASHD3-T guarantees correct reset output logic?
MAX6725KASHD3-T guarantees correct reset output logic state when either VCC1 or VCC2 remains greater than 0.8V - a key specification confirmed in the Absolute Maximum Ratings and Detailed Description sections. This ensures reliable brownout detection and reset assertion even during deep supply sags, unlike many supervisors that require ≥1.2V or higher to maintain output integrity.
MAX6725KASHD3-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:
- 1.313V, 2.925V, 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
MAX6725KASHD3-T FAQ
1.How can I place an order for MAX6725KASHD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725KASHD3-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 MAX6725KASHD3-T reliable?
The price and inventory of MAX6725KASHD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725KASHD3-T is usually 5 days.
3.What payment methods are accepted for MAX6725KASHD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725KASHD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725KASHD3-T?
MAX6725KASHD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725KASHD3-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 MAX6725KASHD3-T?
For technical support, including MAX6725KASHD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725KASHD3-T requirements.
6.How does Aetrix verify that MAX6725KASHD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6725KASHD3-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 MAX6725KASHD3-T meets industry standards.
7.What is the process for return or replacement of MAX6725KASHD3-T?
All MAX6725KASHD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725KASHD3-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 MAX6725KASHD3-T part is unused and in its original packaging.
Return procedure for MAX6725KASHD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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