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Analog Devices Inc./Maxim Integrated MAX6724UTLTD3+T
- Part No.:
- MAX6724UTLTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6724UTLTD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6724UTLTD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference) for auxiliary supply monitoring down to 0.62V. It asserts active-low push-pull reset for ≥210ms after any monitored voltage falls below threshold or manual reset is triggered, and supports watchdog timer with 35s startup/1.12s normal timeout. It is used in multivoltage telecom power systems requiring reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX6724UTLTD3+T datasheet, MAX6724UTLTD3+T pinout, MAX6724UTLTD3+T application, or MAX6724UTLTD3+T equivalent, key selection factors include its dual-supply monitoring capability with factory-trimmed thresholds, guaranteed reset validity down to VCC1/VCC2 = 0.8V, push-pull RST output referenced to VCC1, and integrated watchdog with long startup period for complex boot sequences.
Technical Context
The MAX6724UTLTD3+T implements a triple-monitor architecture: two factory-trimmed comparators for primary (VCC1) and secondary (VCC2) supplies, plus a high-impedance RSTIN comparator with 626.5mV internal reference for third-voltage monitoring via external resistor divider. Its reset logic combines OR-ed fault conditions - VCC1/VCC2 undervoltage, RSTIN undervoltage, or MR assertion - with a monolithic timeout counter ensuring minimum 210ms reset pulse width.
It features a dual-mode watchdog: 35s minimum initial timeout after power-up/manual reset to accommodate system initialization, followed by 1.12s minimum normal timeout requiring periodic WDI transitions. The push-pull RST output is rail-to-rail referenced to VCC1 and guaranteed functional down to VCC1 = 0.8V, while supply current remains ≤14µA typical at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, falling edge; ensures reliable reset assertion before 5V rail collapse) |
| VCC2 Reset Threshold | 3.075V (factory-trimmed, falling edge; matches common 3.3V I/O supply tolerance) |
| RSTIN Reference Voltage | 626.5mV (internal bandgap reference; enables precise third-voltage monitoring via resistor divider) |
| Reset Timeout Period | 210ms (minimum; provides sufficient hold time for processor initialization and peripheral stabilization) |
| Watchdog Timeout | 1.12s (normal mode minimum; detects software hangs without excessive latency) |
| Supply Current | 14µA (typical at 3.6V; enables use in battery-backed or ultra-low-power systems) |
| Operating Temperature | -40°C to +85°C (industrial grade; supports deployment in telecom and industrial equipment) |
Pinout & Package
MAX6724UTLTD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), lead-free, with gull-wing leads and standard JEDEC MO-178 footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on any fault condition and holds for ≥210ms |
| 2 | GND | Analog/digital 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 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry when > VCC1 and sets VCC2 threshold monitor |
| 5 | VCC1 | Primary supply input (1.8V–5.0V range); powers device when > VCC2 and sets VCC1 threshold monitor |
| 6 | RSTIN | Adjustable undervoltage monitor input; asserts reset when voltage falls below 626.5mV reference |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneous monitoring of VCC1, VCC2, and RSTIN enables full-system power integrity coverage in compact SoC-based designs |
| Guaranteed reset validity down to 0.8V | Ensures correct reset state even during deep brownout, critical for fail-safe operation in unregulated DC/DC outputs |
| Dual-mode watchdog timer | 35s startup + 1.12s normal timeout prevents false resets during boot while enabling rapid hang detection in runtime |
| Low 14µA supply current | Minimizes standby power draw in always-on subsystems such as battery-backed real-time clocks or remote sensors |
| Immunity to short VCC transients | Rejects <20µs glitches below threshold, eliminating spurious resets in noisy power environments like motor drives or switching PSUs |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 48V-to-5V/3.3V/1.2V DC/DC converter chain in base station power management unit. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting coordinated reset across FPGA, DSP, and analog front-end upon any rail failure. Use Value: Prevents partial initialization and latch-up by holding reset until all rails stabilize above 4.625V, 3.075V, and 0.62V thresholds respectively. |
Use Scenario: Ensuring deterministic startup of isolated CAN/RS-485 communication interfaces and analog sensor signal chains in modular PLC backplane. IC Role / Device Role / Timing Role: Supervising 24V field power, 5V logic supply, and 3.3V microcontroller core voltage with 210ms reset hold time. Use Value: Guarantees firmware execution begins only after all analog references, isolators, and digital logic are fully powered and stable. |
| Portable Medical Monitor | Set-Top Box Power Management |
Use Scenario: Managing battery-backed 3.7V Li-ion, 3.3V display driver, and 1.8V SoC core in handheld ECG device. IC Role / Device Role / Timing Role: Monitoring main battery (VCC1), display rail (VCC2), and backup SRAM supply (RSTIN) to trigger graceful shutdown before data loss. Use Value: Uses 626.5mV RSTIN reference to detect 2.5V backup rail collapse with <1% error, enabling safe memory save before power loss. |
Use Scenario: Coordinating 12V input, 5V USB/HDMI, and 3.3V SoC supply sequencing in consumer STB with HDMI-CEC wake-up. IC Role / Device Role / Timing Role: Providing synchronized reset to ARM processor and video decoder ICs while supporting manual reset via front-panel button (MR). Use Value: Integrates MR input with internal 50kΩ pullup, eliminating external components and reducing BOM count in cost-sensitive consumer designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720UTLTD3+T | Same pinout and triple-monitor function but open-drain RST output instead of push-pull; requires external pullup resistor. | Suitable where level-shifting or wired-OR reset bus is needed; not compatible with direct µP reset pins requiring active drive. | Select MAX6720UTLTD3+T only if open-drain topology is required for system-level reset arbitration. |
| TPS3808G33DBVR | Dual-supply monitor (VDD, VDDIO) only; no RSTIN input; fixed 3.3V threshold on VDDIO; 200ms timeout. | Lacks third-voltage monitoring capability; cannot replace MAX6724UTLTD3+T in designs requiring auxiliary supply supervision. | Use TPS3808G33DBVR only in simpler dual-rail systems where RSTIN functionality is unused and 3.3V/3.3V monitoring suffices. |
Compared with MAX6724UTLTD3+T, MAX6720UTLTD3+T offers identical supervision logic but requires external pullup for reset signaling, while TPS3808G33DBVR omits RSTIN entirely-making both unsuitable as drop-in replacements unless the design explicitly accommodates their functional limitations.
Availability
MAX6724UTLTD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, portable medical devices, and set-top box power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6724UTLTD3+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 space-constrained multivoltage systems needing reliable, low-quiescent-current supervision with flexible threshold and timeout options across -40°C to +85°C.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6724UTLTD3+T?
The MAX6724UTLTD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (minimum 4.500V, maximum 4.750V) on the falling edge. This value is encoded in the "LT" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is verified across temperature and supply variations per the datasheet's Electrical Characteristics table.
Does the MAX6724UTLTD3+T support monitoring a third voltage, and how is it configured?
Yes, the MAX6724UTLTD3+T supports third-voltage monitoring via its RSTIN pin, which compares the applied voltage against a precise 626.5mV internal reference. To monitor a higher voltage (e.g., 12V), connect an external resistor divider between the supply and GND, with the midpoint fed to RSTIN-ensuring the divided voltage falls within the 0.62V reference window.
What is the reset timeout period for the MAX6724UTLTD3+T, and is it adjustable?
The MAX6724UTLTD3+T has a fixed minimum reset timeout period of 210ms, indicated by the "D3" suffix in its part number. This timeout is internally generated and not user-adjustable; it ensures the reset signal remains asserted long enough for microprocessors and peripherals to complete full initialization after power recovery.
How does the watchdog timer operate on the MAX6724UTLTD3+T?
The MAX6724UTLTD3+T implements a dual-mode watchdog: after any reset event (power-up, MR, or watchdog timeout), it enters a 35s minimum startup mode to allow system boot, then switches to 1.12s minimum normal mode. A valid rising or falling edge on WDI clears the timer; absence of edges beyond the active timeout triggers reset assertion for 210ms.
Is the MAX6724UTLTD3+T pin-compatible with other devices in the MAX6715–MAX6729 family?
Yes, the MAX6724UTLTD3+T shares the same 6-pin SOT23-6 package and pinout as MAX6715–MAX6723/MAX6725–MAX6727 variants. However, functional compatibility depends on feature set: MAX6724UTLTD3+T provides push-pull RST and RSTIN, unlike open-drain-only or dual-RST variants-so substitution requires verification of output type and enabled features.
MAX6724UTLTD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.075V, 4.625V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6724UTLTD3+T FAQ
1.How can I place an order for MAX6724UTLTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6724UTLTD3+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 MAX6724UTLTD3+T reliable?
The price and inventory of MAX6724UTLTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6724UTLTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6724UTLTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6724UTLTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6724UTLTD3+T?
MAX6724UTLTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6724UTLTD3+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 MAX6724UTLTD3+T?
For technical support, including MAX6724UTLTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6724UTLTD3+T requirements.
6.How does Aetrix verify that MAX6724UTLTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6724UTLTD3+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 MAX6724UTLTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6724UTLTD3+T?
All MAX6724UTLTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6724UTLTD3+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 MAX6724UTLTD3+T part is unused and in its original packaging.
Return procedure for MAX6724UTLTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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