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Analog Devices Inc./Maxim Integrated MAX6727KALTD3+T
- Part No.:
- MAX6727KALTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6727KALTD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6727KALTD3+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 minimum reset timeout. It features dual open-drain active-low reset outputs (RST/RST2), manual reset input (MR), watchdog timer (35s startup / 1.12s normal mode), and operates from -40°C to +85°C for reliable system power integrity in multivoltage embedded systems.
For engineers reviewing the MAX6727KALTD3+T datasheet, MAX6727KALTD3+T pinout, MAX6727KALTD3+T application, or MAX6727KALTD3+T equivalent, key selection criteria include confirmed triple-supply monitoring capability, dual independent RST outputs, guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current at 3.6V, and compatibility with battery-operated and industrial equipment requiring robust brownout detection and watchdog supervision.
Technical Context
The MAX6727KALTD3+T implements a dual-comparator architecture for independent VCC1 and VCC2 monitoring plus a dedicated high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap. Its reset logic asserts both RST and RST2 simultaneously upon any monitored voltage drop below threshold, MR assertion, or watchdog timeout - with reset held for a factory-trimmed 210ms minimum timeout period after recovery.
It integrates a dual-mode watchdog timer: a 35s minimum startup period following any reset event enables full system initialization, followed by a 1.12s minimum normal-mode timeout triggered by missing WDI edges. The device guarantees valid reset output state even when VCC1 or VCC2 drops to 0.8V, and supports noise-immune operation via 100ns MR glitch rejection and immunity to sub-20µs VCC transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, ±125mV tolerance) - sets primary supply brownout detection point for 5V/3.3V rail monitoring |
| VCC2 Reset Threshold | 3.075V (factory-trimmed, ±75mV tolerance) - sets secondary supply detection for 3.3V/2.5V rails |
| RSTIN Reference Voltage | 626.5mV (±15.5mV) - enables precise external resistor-divider setup for third-voltage monitoring down to 0.62V |
| Reset Timeout Period | 210ms (min) - ensures sufficient hold time for µP initialization and peripheral stabilization after power recovery |
| Supply Current | 14µA (typ at 3.6V) - enables ultra-low-power operation in battery-backed or energy-sensitive applications |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom environments without derating |
| Watchdog Timeout | 1.12s (min normal mode), 35s (min startup mode) - balances boot-time flexibility with runtime fault detection responsiveness |
Pinout & Package
MAX6727KALTD3+T is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), optimized for space-constrained PCB layouts while supporting dual independent reset outputs and full triple-supply supervision functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4 | RST / RST1 | Active-low open-drain reset output referenced to VCC1; asserted on VCC1/VCC2/RSTIN undervoltage, MR low, or watchdog timeout |
| 2 | GND | System ground reference for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; forces reset when pulled low for ≥1µs |
| 5 | RSTIN | High-impedance adjustable reset input; triggers reset when voltage falls below 626.5mV internal reference |
| 6 | VCC2 | Secondary supply input powering internal VCC2 comparator and RST2 output driver; monitors 0.9V–3.3V rails |
| 7 | VCC1 | Primary supply input powering core logic, VCC1 comparator, RST/RST1 drivers, and watchdog timer; monitors 1.8V–5.0V rails |
| 8 | RST2 | Active-low open-drain reset output referenced to VCC2; identical timing to RST but electrically isolated for dual-rail reset signaling |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent open-drain RST outputs | RST (VCC1-referenced) and RST2 (VCC2-referenced) enable simultaneous, rail-specific reset signaling without shared driver contention |
| Triple-supply monitoring architecture | Factory-trimmed VCC1/VCC2 thresholds + precision 626.5mV RSTIN reference support three distinct voltage domains with <1% total error |
| Dual-mode watchdog timer | 35s startup window prevents false timeout during boot; 1.12s normal mode ensures rapid response to software hangs post-initialization |
| Guaranteed reset validity to 0.8V | Ensures deterministic reset assertion even during deep brownout conditions where VCC1 or VCC2 collapses to near-zero |
| Low-glitch sensitivity | Immunity to VCC transients ≤20µs (at 100mV overdrive) eliminates spurious resets from switching noise or ESD coupling |
Applications
| Industrial PLC Controllers | Telecom Line Cards |
|---|---|
Use Scenario: Programmable logic controllers operating across wide temperature ranges with multiple isolated power rails (5V I/O, 3.3V logic, 1.2V core). IC Role / Device Role / Timing Role: Triple-supply supervisor ensuring synchronized reset of CPU, FPGA, and interface ICs upon any rail failure, with dual RST outputs enabling independent rail recovery sequencing. Use Value: Prevents partial initialization and metastability by holding all subsystems in reset until all three monitored rails stabilize above their respective thresholds. |
Use Scenario: High-density line cards in carrier-grade switches requiring fault-tolerant power management and hot-swap capability. IC Role / Device Role / Timing Role: Monitors primary 3.3V management rail, secondary 1.2V PHY supply, and auxiliary 5V bias voltage via RSTIN divider; asserts reset on first fault with 210ms hold time. Use Value: Enables graceful service interruption and state preservation during transient power faults, meeting GR-1089-CORE immunity requirements. |
| Battery-Powered Medical Devices | Embedded Network Routers |
Use Scenario: Portable diagnostic equipment powered by Li-ion batteries with dynamically scaled rails (3.3V MCU, 1.8V sensor interface, 2.8V display backlight). IC Role / Device Role / Timing Role: Supervises battery voltage decay across three critical domains using RSTIN for programmable low-battery warning; triggers controlled shutdown before brownout. Use Value: Extends usable battery life by avoiding premature shutdown while guaranteeing data integrity through deterministic reset before critical voltage collapse. |
Use Scenario: Multi-core network routers with separate power domains for CPU, packet processor, and PHY interfaces, subject to thermal cycling and load transients. IC Role / Device Role / Timing Role: Provides watchdog supervision of CPU activity and independent reset control for packet processor (RST) and PHY (RST2) on separate rails. Use Value: Isolates fault propagation - a CPU hang triggers RST only, while a PHY rail collapse asserts RST2 independently, preserving packet forwarding path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725KAUTD3+T | Single open-drain RST + single push-pull RST2; no RSTIN input; same VCC1/VCC2 thresholds and 210ms timeout | Lacks third-voltage monitoring; suitable only for dual-rail systems requiring mixed-output drive types | Select when third-supply monitoring is unnecessary and push-pull RST2 simplifies level-shifting to VCC2 domain |
| TPS3808G33DBVR | Dual-supply monitor (VDD/VDDIO) only; no RSTIN; fixed 3.3V/3.3V thresholds; 200ms timeout; 2.5µA quiescent current | No triple-monitoring or watchdog capability; lower supply current but limited voltage flexibility | Choose for cost-sensitive dual-rail applications where 3.3V-only thresholds and minimal current draw outweigh feature gaps |
Compared with MAX6727KALTD3+T, MAX6725KAUTD3+T omits RSTIN and provides push-pull RST2 instead of open-drain, reducing design flexibility for third-rail monitoring but simplifying VCC2-domain interfacing; TPS3808G33DBVR offers lower power but lacks triple monitoring, watchdog, and adjustable thresholds - making it unsuitable for complex multivoltage systems requiring full fault coverage.
Availability
MAX6727KALTD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, battery-powered medical devices, and embedded network routers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6727KALTD3+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 reliability, integration, and low-power operation.
The MAX6715–MAX6729 family delivers compact, ultra-low-voltage supervisory circuits targeting multivoltage embedded systems where space, power, and fault coverage are critical - specifically engineered to replace discrete reset solutions with guaranteed performance across extended temperature ranges.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6727KALTD3+T?
The MAX6727KALTD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (minimum 4.500V, maximum 4.750V) with ±125mV tolerance. This value is encoded in the "AL" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies across the full -40°C to +85°C operating range with 20ppm/°C tempco.
Does the MAX6727KALTD3+T support monitoring a third voltage, and how is it configured?
Yes, the MAX6727KALTD3+T supports third-voltage monitoring via its RSTIN pin, which compares the applied voltage against a precise 626.5mV internal reference. To configure, connect an external resistor divider from the target supply to GND with RSTIN at the midpoint - the monitored threshold equals 626.5mV × (R1 + R2)/R2.
What are the reset output configurations available on the MAX6727KALTD3+T?
The MAX6727KALTD3+T provides two independent active-low open-drain reset outputs: RST (pin 1, referenced to VCC1) and RST2 (pin 8, referenced to VCC2). Both assert simultaneously on any fault condition and remain low for the full 210ms timeout period, requiring external pull-up resistors for proper logic-level translation.
How does the watchdog timer operate on the MAX6727KALTD3+T?
The MAX6727KALTD3+T implements a dual-mode watchdog: after any reset event, it enters a 35s minimum startup mode to allow full system boot, then transitions to a 1.12s minimum normal mode. A rising or falling edge on WDI clears the timer; absence of edges beyond the timeout asserts reset for 210ms.
Is the MAX6727KALTD3+T compatible with 1.8V logic systems?
Yes, the MAX6727KALTD3+T guarantees valid reset output operation when either VCC1 or VCC2 remains ≥0.8V, fully supporting 1.8V systems. Its VCC2 input accepts 0.9V–3.3V, and RSTIN monitoring extends down to 0.62V - enabling robust supervision of modern low-voltage microcontrollers and FPGAs.
MAX6727KALTD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.075V, 4.625V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- 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
MAX6727KALTD3+T FAQ
1.How can I place an order for MAX6727KALTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6727KALTD3+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 MAX6727KALTD3+T reliable?
The price and inventory of MAX6727KALTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6727KALTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6727KALTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6727KALTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6727KALTD3+T?
MAX6727KALTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6727KALTD3+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 MAX6727KALTD3+T?
For technical support, including MAX6727KALTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6727KALTD3+T requirements.
6.How does Aetrix verify that MAX6727KALTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6727KALTD3+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 MAX6727KALTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6727KALTD3+T?
All MAX6727KALTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6727KALTD3+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 MAX6727KALTD3+T part is unused and in its original packaging.
Return procedure for MAX6727KALTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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