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Analog Devices Inc./Maxim Integrated MAX6723UTZWD3
- Part No.:
- MAX6723UTZWD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6723UTZWD3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
MAX6723UTZWD3 from Maxim Integrated is a dual-voltage, ultra-low-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (primary supply) at 3.075V threshold and VCC2 (secondary supply) at 2.925V threshold, with externally adjustable RSTIN input (626.5mV reference), 210ms reset timeout, and integrated watchdog timer (35s startup / 1.12s normal mode). It ensures reliable system reset during power-up, brownout, or software fault in battery-powered embedded controllers.
For engineers reviewing the MAX6723UTZWD3 datasheet, MAX6723UTZWD3 pinout, MAX6723UTZWD3 application, or MAX6723UTZWD3 equivalent, key selection criteria include dual-supply voltage monitoring accuracy (±1.5% over -40°C to +125°C), guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current, and watchdog disable capability via open WDI pin.
Technical Context
The MAX6723UTZWD3 implements independent dual-voltage supervision with factory-trimmed thresholds for VCC1 and VCC2, plus an auxiliary RSTIN comparator referenced to a 626.5mV internal bandgap. Its watchdog timer features a dual-mode architecture: 35s minimum startup period after any reset event, followed by 1.12s minimum normal timeout upon first WDI transition.
Reset assertion occurs when either VCC1 drops below 3.075V, VCC2 falls below 2.925V, RSTIN falls below 626.5mV, MR is pulled low, or WDI remains static beyond timeout - with reset held active for 210ms minimum after all monitored voltages recover. The device guarantees correct reset logic state with VCC1 or VCC2 ≥ 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.075V (factory-trimmed, ±1.5% over temp, monitors primary supply like 3.3V I/O rail) |
| VCC2 Threshold | 2.925V (factory-trimmed, ±1.5% over temp, monitors secondary supply like 2.8V core rail) |
| RSTIN Reference | 626.5mV (internal precision bandgap, enables third-voltage monitoring down to 0.62V via resistor divider) |
| Reset Timeout | 210ms (minimum duration reset remains asserted after recovery, prevents premature µP release) |
| Watchdog Timeout | 1.12s (normal mode, starts after first WDI edge post-reset; 35s startup mode allows full boot sequence) |
| Supply Current | 14µA (typ at 3.6V, enables multi-year operation in coin-cell–powered IoT sensors) |
| Operating Temp | -40°C to +125°C (qualified for automotive under-hood and industrial control environments) |
Pinout & Package
MAX6723UTZWD3 is housed in a RoHS-compliant 6-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserts low on fault and holds for 210ms timeout |
| 2 | GND | Ground reference for all internal comparators and outputs; requires low-impedance connection to PCB ground plane |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; debounced by 100ns glitch rejection |
| 4 | VCC2 | Secondary supply input powering VCC2 comparator and RST2 logic; valid from 0.8V to 5.5V |
| 5 | VCC1 | Primary supply input powering core logic, VCC1 comparator, and push-pull RST output; valid from 0.8V to 5.5V |
| 6 | WDI | Watchdog input; unconnected state disables watchdog; rising/falling edges reset 1.12s timer (35s startup mode first) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 (3.075V) and VCC2 (2.925V) with separate comparators and hysteresis |
| Externally adjustable third-voltage monitor | RSTIN input with 626.5mV reference enables precise monitoring of auxiliary rails (e.g., 1.2V, 1.8V) using high-value resistors |
| Dual-mode watchdog timer | 35s startup window accommodates full firmware initialization; 1.12s normal timeout ensures rapid fault detection during runtime |
| Guaranteed reset validity at low VCC | Correct reset assertion guaranteed even when VCC1 or VCC2 drops to 0.8V - critical for brownout resilience |
| Immunity to short VCC transients | Rejects sub-20µs negative glitches up to 100mV below threshold - eliminates spurious resets in noisy power environments |
Applications
| Battery-Powered IoT Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: A wireless sensor node powered by CR2032 battery monitors temperature and humidity, transmitting data every 5 minutes while sleeping between intervals. IC Role / Device Role / Timing Role: MAX6723UTZWD3 supervises both the 3.0V RF transceiver supply (VCC1) and 2.8V MCU core supply (VCC2), asserting reset if either sags below threshold during cold-start or battery depletion. Use Value: 14µA quiescent current extends battery life beyond 5 years; 210ms reset timeout prevents false wakeups during transient voltage dips. | Use Scenario: A body control unit manages door locks, lighting, and window motors, requiring fail-safe reset behavior during vehicle ignition and load-dump events. IC Role / Device Role / Timing Role: MAX6723UTZWD3 monitors 5V system rail (VCC1) and 3.3V microcontroller domain (VCC2), with RSTIN tied to a 12V-to-3.3V LDO feedback node to detect pre-regulator failure. Use Value: Guaranteed reset operation down to 0.8V supports robust brownout response during cranking; -40°C to +125°C rating meets AEC-Q100 ambient requirements. |
| Industrial PLC I/O Module | Medical Portable Diagnostic Device |
Use Scenario: An isolated digital I/O module interfaces with field sensors and actuators, operating from a 24V DC input converted to 3.3V and 5V rails. IC Role / Device Role / Timing Role: MAX6723UTZWD3 supervises the 5V I/O supply (VCC1) and 3.3V FPGA configuration supply (VCC2); WDI connected to FPGA status register to detect firmware hang. Use Value: Dual-mode watchdog (35s startup + 1.12s runtime) prevents lockup during FPGA reconfiguration; 2.925V/3.075V thresholds match common industrial rail tolerances. | Use Scenario: A handheld ultrasound probe uses a low-power ARM Cortex-M7 MCU and analog front-end, powered by rechargeable Li-ion with multiple DC-DC stages. IC Role / Device Role / Timing Role: MAX6723UTZWD3 monitors 3.3V analog supply (VCC1) and 1.2V digital core (VCC2), with RSTIN configured to monitor 1.8V memory interface rail via resistor divider. Use Value: Factory-trimmed thresholds eliminate calibration overhead; 626.5mV RSTIN reference enables accurate 1.8V monitoring without external references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6724UTZWD3 | Identical pinout and package; VCC1 threshold = 3.075V, VCC2 = 3.075V (dual 3.075V), same 210ms timeout and watchdog | Used where symmetric dual-rail monitoring is required (e.g., dual 3.3V domains), not asymmetric 3.075V/2.925V | Select MAX6724UTZWD3 only when identical thresholds on both supplies are needed; MAX6723UTZWD3 provides tighter margin for 2.8V core rails. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); no RSTIN, no watchdog; 200ms timeout; 1.5µA IQ; SOT23-6 | Lacks dual-voltage capability and auxiliary monitoring; suitable only for single-rail systems with ultra-low power priority | Choose TPS3808G33DBVR only for cost-sensitive, single-rail designs where 1.5µA IQ outweighs need for dual monitoring or watchdog safety. |
Compared with MAX6724UTZWD3, MAX6723UTZWD3 offers asymmetric thresholds better suited for mixed-voltage SoC systems; versus TPS3808G33DBVR, it delivers essential dual-rail supervision and watchdog functionality at the cost of higher quiescent current - a necessary trade-off for functional safety in complex embedded systems.
Availability
MAX6723UTZWD3 is available at Aetrix Electronics and suitable for battery-powered IoT nodes, automotive body control modules, industrial PLC I/O modules, and medical portable diagnostic devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6723UTZWD3 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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage µP supervisory circuits targeting space- and power-constrained embedded systems requiring dual/triple supply monitoring, watchdog safety, and guaranteed operation down to 0.8V supply.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6723UTZWD3?
The MAX6723UTZWD3 has a factory-trimmed VCC1 reset threshold of 3.075V (±1.5%) and a VCC2 threshold of 2.925V (±1.5%), both specified over -40°C to +125°C. These values are encoded in the part number suffix "WD3", per Maxim's Reset Voltage Threshold Suffix Guide, and are measured at the respective VCC pins with respect to GND.
Does the MAX6723UTZWD3 support watchdog functionality, and how is it configured?
Yes, the MAX6723UTZWD3 includes a dual-mode watchdog timer. It defaults to a 35s minimum startup period after any reset event, then switches to a 1.12s minimum normal timeout after the first valid WDI transition. To enable it, connect WDI to a processor GPIO; leave WDI unconnected to disable the watchdog entirely - the device detects this via a 200nA internal current source.
Can the MAX6723UTZWD3 monitor a third voltage, and what is the reference voltage for RSTIN?
Yes, the MAX6723UTZWD3 supports third-voltage monitoring via the RSTIN pin, which compares the applied voltage against an internal 626.5mV bandgap reference. This allows precise monitoring of auxiliary rails (e.g., 1.2V, 1.8V) using an external resistor divider, with typical input hysteresis of 3mV and leakage current under ±100nA.
What is the reset timeout period of the MAX6723UTZWD3, and is it adjustable?
The MAX6723UTZWD3 has a fixed reset timeout period of 210ms (minimum), as indicated by the "D3" suffix in its part number. This value is factory-programmed and not user-adjustable; it defines the minimum duration the RST output remains asserted after all monitored supplies recover above their thresholds, ensuring sufficient time for system stabilization before µP release.
Is the MAX6723UTZWD3 compatible with 0.8V supply operation, and how is reset validity ensured at low voltage?
Yes, the MAX6723UTZWD3 guarantees correct reset output logic state when either VCC1 or VCC2 remains ≥ 0.8V - a key specification for brownout resilience. This is achieved through internal low-voltage biasing and comparator design; no external components are required to maintain reset integrity down to this level, unlike many competing supervisors that fail below 1.0V.
MAX6723UTZWD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.665V, 2.313V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6723UTZWD3 FAQ
1.How can I place an order for MAX6723UTZWD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6723UTZWD3 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 MAX6723UTZWD3 reliable?
The price and inventory of MAX6723UTZWD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6723UTZWD3 is usually 5 days.
3.What payment methods are accepted for MAX6723UTZWD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6723UTZWD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6723UTZWD3?
MAX6723UTZWD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6723UTZWD3 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 MAX6723UTZWD3?
For technical support, including MAX6723UTZWD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6723UTZWD3 requirements.
6.How does Aetrix verify that MAX6723UTZWD3 is sourced from the original manufacturer or authorized distributors?
All MAX6723UTZWD3 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 MAX6723UTZWD3 meets industry standards.
7.What is the process for return or replacement of MAX6723UTZWD3?
All MAX6723UTZWD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6723UTZWD3, 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 MAX6723UTZWD3 part is unused and in its original packaging.
Return procedure for MAX6723UTZWD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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