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Analog Devices Inc./Maxim Integrated MAX6723UTLTD3+
- Part No.:
- MAX6723UTLTD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6723UTLTD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,092
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Product details
Overview
MAX6723UTLTD3+ 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 third supply via RSTIN (626.5mV reference). It asserts active-low open-drain reset for ≥210ms after any monitored voltage drops below threshold or manual reset is triggered. Used in multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.
For engineers reviewing the MAX6723UTLTD3+ datasheet, MAX6723UTLTD3+ pinout, MAX6723UTLTD3+ application, or MAX6723UTLTD3+ equivalent, key selection factors include its dual-supply monitoring with factory-trimmed thresholds, 210ms reset timeout, open-drain RST output, RSTIN-based auxiliary voltage monitoring capability, and guaranteed reset validity down to VCC1/VCC2 = 0.8V.
Technical Context
The MAX6723UTLTD3+ implements independent voltage comparators for VCC1 and VCC2 with ±1.5% threshold accuracy and 20ppm/°C tempco, plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap. Reset assertion is latched and held for a minimum 210ms timeout after all monitored voltages recover.
It features no watchdog or power-fail functionality (per Selector Guide), includes internal 50kΩ MR pullup, and guarantees correct reset logic state when either VCC1 or VCC2 remains ≥0.8V - enabling robust operation during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% tolerance) - sets primary supply brownout detection point for 5V or 4.75V rails |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% tolerance) - enables precise monitoring of 3.3V I/O or auxiliary supplies |
| RSTIN Reference | 626.5mV (internal bandgap) - allows external resistor divider to monitor third supply as low as 0.62V |
| Reset Timeout | 210ms (minimum) - ensures sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14µA typical at 3.6V - minimizes quiescent load on battery-backed or low-power systems |
| Operating Temp | -40°C to +85°C - qualified for industrial and telecom equipment environments |
| Reset Output | Active-low open-drain RST - requires external pullup; compatible with bidirectional µP reset pins |
Pinout & Package
MAX6723UTLTD3+ is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free (+ suffix), RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; asserted when VCC1 < 4.625V, VCC2 < 3.075V, or MR pulled low; requires external pullup |
| 2 | GND | Ground reference for all internal comparators and logic; must be low-impedance connection |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); initiates reset when pulled ≤0.3×VCC1 |
| 4 | VCC2 | Secondary supply input; powers internal circuitry when VCC2 > VCC1 and sets VCC2 comparator reference |
| 5 | VCC1 | Primary supply input; powers device when VCC1 > VCC2 and sets VCC1 comparator reference |
| 6 | RSTIN | Adjustable reset input; high-impedance node referenced to 626.5mV internal reference; used to monitor third supply via resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitors | VCC1 = 4.625V ±1.5%, VCC2 = 3.075V ±1.5% - eliminates external resistor networks for primary/secondary rail supervision |
| Externally adjustable third-voltage monitor | RSTIN with 626.5mV internal reference and ±25nA input current - supports monitoring of sub-1V cores or auxiliary rails with minimal power loss |
| Guaranteed reset validity down to 0.8V | Functional reset assertion even when VCC1 or VCC2 drops to 0.8V - ensures fail-safe behavior during severe brownouts |
| Immunity to short VCC transients | Resists glitches ≤20µs (at 100mV overdrive) - prevents spurious resets from switching noise or ESD-induced supply dips |
| Low quiescent current | 14µA typical at 3.6V - extends battery life in portable equipment and reduces thermal load in dense PCB layouts |
Applications
| Industrial PLC Power Sequencing | Telecom Line Card Voltage Monitoring |
|---|---|
Use Scenario: Supervising 5V control rail, 3.3V I/O rail, and 1.2V FPGA core rail in modular industrial controllers. IC Role / Device Role / Timing Role: Triple-voltage supervisor ensuring synchronized reset release only after all three rails stabilize above their thresholds. Use Value: Prevents partial initialization and latch-up by enforcing strict power-good sequencing across heterogeneous voltage domains. |
Use Scenario: Monitoring primary DC-DC output (4.625V), secondary bias rail (3.075V), and auxiliary management rail (via RSTIN) in carrier-grade line cards. IC Role / Device Role / Timing Role: Fault-detection agent asserting reset on any rail undervoltage event, with 210ms hold time for hot-swap controller coordination. Use Value: Enables graceful service interruption and automatic recovery without host CPU intervention during transient power faults. |
| Medical Diagnostic Imaging Subsystem | Automotive Infotainment Power Management |
Use Scenario: Validating stable 5V analog front-end supply, 3.3V digital interface supply, and 1.8V ADC core supply in ultrasound signal processing modules. IC Role / Device Role / Timing Role: Safety-critical supervisory element providing deterministic reset pulse upon first detected rail fault, with no watchdog dependency. Use Value: Meets IEC 62304 Class C software safety requirements by eliminating single-point failure modes in power monitoring path. |
Use Scenario: Ensuring clean boot of infotainment SoC by supervising 5V system rail, 3.3V CAN transceiver rail, and 1.1V GPU core rail (via RSTIN divider). IC Role / Device Role / Timing Role: Standalone reset generator with no firmware dependency, asserting reset within 20µs of VCC1 drop below 4.625V. Use Value: Guarantees deterministic cold-boot behavior across temperature extremes (-40°C to +85°C) without MCU involvement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6724UTLTD3+ | Same pinout, identical thresholds and timeout, but push-pull RST output instead of open-drain | Requires no external pullup; incompatible with bidirectional µP reset pins without series resistor | Select MAX6724UTLTD3+ only if driving CMOS inputs directly and no bidirectional interface is needed |
| TPS3808G33DBVR | Dual-supply monitor only (no RSTIN), fixed 3.3V VDD threshold, 200ms timeout, 2.5µA IQ | Lacks third-voltage monitoring; suitable only for simpler two-rail systems | Choose TPS3808G33DBVR when third-rail supervision is unnecessary and ultra-low IQ is prioritized over flexibility |
Compared with MAX6724UTLTD3+, the MAX6723UTLTD3+ offers open-drain compatibility with legacy µP reset interfaces but requires an external pullup; versus TPS3808G33DBVR, it provides critical RSTIN-based third-rail monitoring at the cost of higher supply current, making it uniquely suited for complex multivoltage embedded designs.
Availability
MAX6723UTLTD3+ is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, medical imaging subsystems, and automotive infotainment systems requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6723UTLTD3+ 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 precision 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-power, factory-trimmed power-supply supervision without external components.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6723UTLTD3+?
The MAX6723UTLTD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over temperature. These values are encoded in the "LT" suffix per Maxim's Reset Voltage Threshold Suffix Guide and are verified across -40°C to +85°C. The MAX6723UTLTD3+ does not support adjustable thresholds on VCC1 or VCC2 - only RSTIN is externally configurable.
Does the MAX6723UTLTD3+ include a watchdog timer or power-fail functionality?
No, the MAX6723UTLTD3+ does not include watchdog timer or power-fail input/output functionality. Per Maxim's Selector Guide, MAX6723 is explicitly listed with "√" under "RSTIN" and "Manual Reset", but "-" under "Watchdog Input" and "Power-Fail Input/Output". Its feature set is limited to triple-voltage supervision (VCC1, VCC2, RSTIN), manual reset, and open-drain reset output - making it a focused solution for systems requiring auxiliary rail monitoring without added complexity.
What is the function of the RSTIN pin on the MAX6723UTLTD3+ and how is it used?
The RSTIN pin on the MAX6723UTLTD3+ is a high-impedance input referenced to an internal 626.5mV bandgap voltage. It enables monitoring of a third supply voltage using an external resistor divider: VEXT_TH = 626.5mV × (R1 + R2)/R2. With ±25nA input current, large-value resistors can be used to minimize power loss. The MAX6723UTLTD3+ asserts reset when RSTIN falls below 626.5mV - allowing supervision of supplies as low as 0.62V.
What package type and pin count does the MAX6723UTLTD3+ use?
The MAX6723UTLTD3+ uses a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), lead-free and RoHS-compliant (indicated by the "+" suffix). This matches the ordering information stating "MAX6723UT_ _D_ -T" with "6 SOT23-6" package. Pinout is fixed per datasheet: Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = VCC1, Pin 6 = RSTIN.
How does the MAX6723UTLTD3+ ensure valid reset operation during deep brownout conditions?
The MAX6723UTLTD3+ guarantees correct reset output logic state as long as either VCC1 or VCC2 remains ≥0.8V - verified across -40°C to +85°C. This is achieved through internal biasing and comparator design that maintains functionality well below typical reset thresholds. For operation down to 0V, a 100kΩ pull-down on RST is recommended, though this applies only to push-pull variants; the MAX6723UTLTD3+'s open-drain RST requires a pullup, not pull-down, for defined idle state.
MAX6723UTLTD3+ 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:
- 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-6
MAX6723UTLTD3+ FAQ
1.How can I place an order for MAX6723UTLTD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6723UTLTD3+ 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 MAX6723UTLTD3+ reliable?
The price and inventory of MAX6723UTLTD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6723UTLTD3+ is usually 5 days.
3.What payment methods are accepted for MAX6723UTLTD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6723UTLTD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6723UTLTD3+?
MAX6723UTLTD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6723UTLTD3+ 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 MAX6723UTLTD3+?
For technical support, including MAX6723UTLTD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6723UTLTD3+ requirements.
6.How does Aetrix verify that MAX6723UTLTD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6723UTLTD3+ 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 MAX6723UTLTD3+ meets industry standards.
7.What is the process for return or replacement of MAX6723UTLTD3+?
All MAX6723UTLTD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6723UTLTD3+, 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 MAX6723UTLTD3+ part is unused and in its original packaging.
Return procedure for MAX6723UTLTD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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