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Analog Devices Inc./Maxim Integrated MAX6726KASVD4+
- Part No.:
- MAX6726KASVD4+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726KASVD4+.pdf
- Description:
- POWER SUPPLY MANAGEMENT CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:5,825
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Product details
Overview
MAX6726KASVD4+ 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 1120ms reset timeout, push-pull RST and RST2 outputs, manual reset input, and watchdog timer - used in multivoltage server power rails to ensure deterministic reset during brownout or startup.
For engineers reviewing the MAX6726KASVD4+ datasheet, MAX6726KASVD4+ pinout, MAX6726KASVD4+ application, or MAX6726KASVD4+ equivalent, key selection criteria include guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and dual-mode watchdog (35s startup / 1.12s normal timeout).
Technical Context
The MAX6726KASVD4+ integrates three independent voltage monitors: primary (VCC1), secondary (VCC2), and auxiliary (RSTIN), each with factory-trimmed or resistor-divider–set thresholds. Its dual-mode watchdog uses a long 35s minimum startup period followed by a 1.12s minimum normal timeout, triggered by WDI edge transitions.
It features push-pull RST and RST2 outputs referenced to VCC1 and VCC2 respectively, a manual reset input with 50kΩ internal pullup to VCC1, and operates across –40°C to +85°C. Reset assertion is guaranteed while either VCC1 or VCC2 remains ≥0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% tolerance) - sets precise reset point for main system rail |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% tolerance) - monitors I/O or auxiliary supply independently |
| RSTIN Reference | 626.5mV (internal bandgap, ±2.5mV hysteresis) - enables third-voltage monitoring down to 0.62V via external divider |
| Reset Timeout | 1120ms (min) - ensures sufficient hold time for full system initialization after power recovery |
| Supply Current | 14µA (typ at 3.6V) - minimizes quiescent load on battery-backed or low-power rails |
| Watchdog Timeout | 1.12s (min normal mode); 35s (min startup mode) - accommodates boot sequences then enforces runtime supervision |
| Operating Temp | –40°C to +85°C - qualified for industrial and telecom equipment environments |
Pinout & Package
MAX6726KASVD4+ is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts when any monitored voltage drops below threshold |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; forces reset when pulled low |
| 4 | PFO | Active-low power-fail output (push-pull, VCC1-referenced); asserts when PFI < 626.5mV, no timeout delay |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry and sets VCC2 monitor reference |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers device core and sets VCC1 monitor reference |
| 7 | RSTIN/PFI | Shared pin: selectable as adjustable reset input (RSTIN) or power-fail monitor input (PFI); 626.5mV internal reference |
| 8 | RST2 | Active-low push-pull reset output referenced to VCC2; independent assertion timing, same timeout as RST |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST (VCC1-referenced) and RST2 (VCC2-referenced) enable separate reset control of CPU and I/O domains |
| Triple-voltage monitoring | Simultaneous supervision of VCC1, VCC2, and RSTIN (or PFI) eliminates need for multiple discrete supervisors |
| Guaranteed reset validity to 0.8V | Ensures clean, predictable reset assertion even during deep brownout conditions on either supply rail |
| Low-glitch immunity | Immune to VCC transients <20µs (at 100mV overdrive), preventing spurious resets in noisy power environments |
| Dual-mode watchdog | 35s startup window allows full BIOS/OS boot before enforcing 1.12s runtime supervision - avoids false timeouts |
Applications
| Server Power Sequencing | Industrial PLC I/O Module |
|---|---|
Use Scenario: Coordinating power-up of CPU core (1.2V), memory interface (1.8V), and I/O bank (3.3V) in x86 server motherboards. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting synchronized RST and RST2 signals with 1120ms timeout to meet Intel VRD requirements. Use Value: Eliminates external RC timing networks and discrete comparators, reducing BOM count and layout area by >40%. |
Use Scenario: Monitoring isolated 24V field power, 5V logic rail, and 3.3V FPGA core in modular programmable logic controllers. IC Role / Device Role / Timing Role: Supervises VCC1 (5V), VCC2 (3.3V), and RSTIN (derived from 24V via resistor divider) to trigger safe I/O shutdown on undervoltage. Use Value: Enables single-chip detection of three independent fault conditions, reducing failure-to-safety response time to <1.2ms. |
| Telecom Line Card | Battery-Powered Edge Gateway |
Use Scenario: Ensuring reliable boot and runtime supervision of DSP, PHY, and management MCU on carrier-grade line cards with dual DC/DC outputs. IC Role / Device Role / Timing Role: Uses RSTIN to monitor intermediate 12V bus and PFO to generate early power-fail interrupt before main 3.3V rail collapses. Use Value: Provides 2µs PFI→PFO propagation delay for deterministic firmware-initiated graceful shutdown prior to brownout. |
Use Scenario: Managing cold-start and brownout resilience in LTE/Wi-Fi edge gateways powered by Li-ion (3.0–4.2V) and buck-converted 1.8V/3.3V rails. IC Role / Device Role / Timing Role: Monitors battery voltage (via RSTIN divider), 3.3V system rail (VCC1), and 1.8V core rail (VCC2) with ultra-low 14µA ICC to extend standby life. Use Value: Achieves >10-year shelf life in always-on deployments due to sub-15µA quiescent current across full temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KASVD3+ | Same package, identical VCC1/VCC2 thresholds and RSTIN reference, but 280ms reset timeout (vs. 1120ms) | Suitable for fast-boot embedded systems where shorter reset hold time is acceptable | Select MAX6726KASVD3+ only if system initialization completes within 280ms; otherwise MAX6726KASVD4+ ensures robust timing margin. |
| TPS3808G33DBVR | Dual-voltage supervisor (no RSTIN/PFI), 3.3V fixed VDD threshold, 200ms timeout, SOT23-6 package | Lacks third-voltage monitoring and dual reset outputs; requires external circuitry for RSTIN-equivalent function | Choose TPS3808G33DBVR only for cost-sensitive dual-rail designs without auxiliary voltage supervision needs. |
Compared with MAX6726KASVD3+, MAX6726KASVD4+ provides four times longer reset timeout for safety-critical initialization; compared with TPS3808G33DBVR, it delivers integrated triple monitoring and dual-domain reset control - eliminating design compromises in multivoltage systems.
Availability
MAX6726KASVD4+ is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC I/O modules, telecom line cards, battery-powered edge gateways, and multivoltage embedded systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX6726KASVD4+ 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 space-constrained multivoltage systems requiring deterministic, low-power, triple-rail supervision with integrated watchdog and power-fail functionality - targeting servers, telecom infrastructure, and ruggedized embedded platforms.
FAQ
What is the exact reset timeout period of the MAX6726KASVD4+?
The MAX6726KASVD4+ has a guaranteed minimum reset timeout period of 1120ms, with typical value 1680ms and maximum 2240ms. This timeout begins when all monitored supplies (VCC1, VCC2, RSTIN) rise above their respective thresholds and continues uninterrupted, ensuring sufficient hold time for complete system initialization before release.
Does the MAX6726KASVD4+ support both push-pull and open-drain reset outputs?
No - the MAX6726KASVD4+ features two push-pull active-low reset outputs: RST (referenced to VCC1) and RST2 (referenced to VCC2). It does not offer open-drain variants; those are found in other members of the MAX6715–MAX6729 family such as MAX6725. Push-pull operation eliminates need for external pullup resistors.
How is the third-voltage monitoring implemented on the MAX6726KASVD4+?
The MAX6726KASVD4+ implements third-voltage monitoring via the RSTIN/PFI pin, which uses an internal 626.5mV precision reference. An external resistor divider scales the target supply voltage so that the divided voltage equals 626.5mV at the desired trip point - enabling accurate monitoring of voltages as low as 0.62V.
What is the operating voltage range for VCC1 and VCC2 on the MAX6726KASVD4+?
VCC1 accepts 1.8V to 5.0V for primary supply monitoring, while VCC2 accepts 0.9V to 3.3V for secondary supply monitoring. The device guarantees correct reset logic state as long as either VCC1 or VCC2 remains ≥0.8V - critical for brownout resilience in multirail systems.
Can the MAX6726KASVD4+ be used for power-fail detection?
Yes - the shared RSTIN/PFI pin can be configured as a power-fail input (PFI). When used this way, it compares the applied voltage against the same 626.5mV internal reference and drives the PFO pin low with 2µs typical delay. PFO is push-pull and active-low, providing immediate interrupt signaling without reset timeout delay.
MAX6726KASVD4+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.575V, 2.925V, Adj
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6726KASVD4+ FAQ
1.How can I place an order for MAX6726KASVD4+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KASVD4+ 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 MAX6726KASVD4+ reliable?
The price and inventory of MAX6726KASVD4+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KASVD4+ is usually 5 days.
3.What payment methods are accepted for MAX6726KASVD4+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KASVD4+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KASVD4+?
MAX6726KASVD4+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KASVD4+ 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 MAX6726KASVD4+?
For technical support, including MAX6726KASVD4+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KASVD4+ requirements.
6.How does Aetrix verify that MAX6726KASVD4+ is sourced from the original manufacturer or authorized distributors?
All MAX6726KASVD4+ 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 MAX6726KASVD4+ meets industry standards.
7.What is the process for return or replacement of MAX6726KASVD4+?
All MAX6726KASVD4+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KASVD4+, 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 MAX6726KASVD4+ part is unused and in its original packaging.
Return procedure for MAX6726KASVD4+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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