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Analog Devices Inc./Maxim Integrated MAX6723UTZWD3-T
- Part No.:
- MAX6723UTZWD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6723UTZWD3-T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6723UTZWD3-T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) supply rails with factory-trimmed thresholds of 3.075V (VTH1), 2.925V (VTH2), and 626.5mV reference for RSTIN. It provides open-drain active-low reset output with 210ms minimum timeout, watchdog timer (35s startup / 1.12s normal), and manual reset input - used in telecom power management systems to ensure reliable boot and brownout recovery.
For engineers reviewing the MAX6723UTZWD3-T datasheet, MAX6723UTZWD3-T pinout, MAX6723UTZWD3-T application, or MAX6723UTZWD3-T equivalent, key selection criteria include triple-supply monitoring capability, guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current at 3.6V, immunity to short VCC transients, and compatibility with battery-backed or multirail embedded systems requiring deterministic reset behavior.
Technical Context
The MAX6723UTZWD3-T implements dual independent voltage comparators for VCC1 and VCC2 plus a dedicated high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap, enabling precise third-rail monitoring via external resistor divider. Its reset logic asserts RST when any monitored rail falls below threshold and holds it for a fixed 210ms timeout after all rails recover.
It integrates a dual-mode watchdog timer: a 35s minimum startup period allows full system initialization post-power-up, followed by a 1.12s minimum normal timeout triggered by WDI edge transitions. The manual reset input (MR) features a 50kΩ internal pullup to VCC1 and 200ns MR-to-reset delay, supporting pushbutton or logic-driven reset initiation without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 3.075V (typ), factory-trimmed - ensures reliable reset assertion for 3.3V primary supplies with ±1.5% tolerance over temperature |
| VCC2 Reset Threshold | 2.925V (typ), factory-trimmed - supports secondary 3.0V or 2.8V rails with guaranteed hysteresis and 20ppm/°C tempco |
| RSTIN Threshold | 626.5mV (typ), internal reference - enables monitoring of auxiliary voltages ≥0.62V using external resistor divider |
| Reset Timeout Period | 210ms (min), D3 suffix - provides sufficient hold time for slow-start DC/DC converters and FPGA configuration sequences |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent load on battery or low-power standby rails |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom equipment environments without derating |
| Reset Output Type | Open-drain active-low RST - compatible with bidirectional µP reset pins and flexible pullup voltage selection |
Pinout & Package
MAX6723UTZWD3-T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, RoHS-compliant, with thermal pad option not included. Pin 1 is marked by dot; pin numbering follows standard SOT23 convention (counterclockwise from mark).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output - asserted when VCC1, VCC2, or RSTIN drops below threshold; requires external pullup |
| 2 | GND | Analog/digital ground reference - must be connected to system common ground plane for accurate threshold sensing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC1 (50kΩ); 200ns delay to RST assertion; TTL/CMOS compatible |
| 4 | VCC2 | Secondary supply input - powers internal VCC2 comparator and sets VTH2 threshold; valid from 0.9V to 3.3V |
| 5 | WDI | Watchdog input - edge-sensitive; clears watchdog timer on rising/falling transition; 50ns pulse width minimum |
| 6 | VCC1 | Primary supply input - powers core logic and sets VTH1 threshold; valid from 1.8V to 5.0V; reset valid down to 0.8V |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitors | VTH1 = 3.075V, VTH2 = 2.925V - eliminates external resistor networks and calibration for standard 3.3V/3.0V rail supervision |
| Adjustable third-rail monitor (RSTIN) | 626.5mV internal reference with <25nA input current - enables low-power monitoring of voltages as low as 0.62V via high-value dividers |
| Dual-mode watchdog timer | 35s min startup + 1.12s min normal timeout - prevents false resets during boot while ensuring rapid fault detection in runtime |
| Guaranteed reset validity at low VCC | Operates correctly with VCC1 or VCC2 ≥ 0.8V - ensures robust reset signaling during deep brownout conditions |
| Immunity to VCC transients | Withstands ≤20µs negative glitches at 100mV overdrive - avoids spurious resets in noisy power environments |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Supervising primary 3.3V backplane supply, secondary 2.8V FPGA I/O bank, and auxiliary 1.2V core voltage in carrier-grade line cards. IC Role / Device Role / Timing Role: Triple-rail voltage monitor and reset coordinator - asserts RST until all three rails stabilize above thresholds and holds for 210ms to allow FPGA configuration completion. Use Value: Prevents partial initialization and latch-up by enforcing strict power-good sequencing before processor release. |
Use Scenario: Monitoring redundant 24V DC input, isolated 5V logic supply, and 3.3V microcontroller core in programmable logic controller modules. IC Role / Device Role / Timing Role: Fault-detection supervisor with manual reset override - uses MR for field-service recovery and WDI for software-alive verification. Use Value: Enables fail-safe operation in safety-critical automation by combining hardware reset assurance with watchdog-based software health monitoring. |
| Battery-Powered Edge Gateway | Set-Top Box Power Management |
|
Use Scenario: Supervising Li-ion battery output (3.6V), buck-converted 1.8V SoC core, and LDO-regulated 1.2V memory interface in IoT gateways. IC Role / Device Role / Timing Role: Ultra-low-current (14µA typ) triple-supply monitor - uses RSTIN to track battery voltage decay and trigger graceful shutdown before cutoff. Use Value: Extends usable battery life by eliminating need for separate fuel-gauge IC while maintaining deterministic reset behavior. |
Use Scenario: Coordinating power-up of main 12V SMPS, 3.3V decoder ASIC supply, and 1.8V tuner subsystem in digital broadcast receivers. IC Role / Device Role / Timing Role: Dual-threshold supervisor with 210ms timeout - ensures stable 3.3V rail before releasing reset to decoder, preventing video lock-up on cold start. Use Value: Eliminates customer-reported "black screen" failures by guaranteeing reset deassertion only after all critical supplies meet timing and voltage margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6724UTZWD3-T | Push-pull RST output instead of open-drain; identical thresholds, timeout, and feature set | Requires VCC1-referenced pullup; incompatible with bidirectional µP reset pins without series resistor | Select when driving CMOS inputs directly or when board layout prohibits external pullup components |
| TPS3808G33DBVR | Dual-voltage monitor only (no RSTIN); 3.3V fixed VDD threshold; 200ms timeout; 1.6µA IQ | Lacks third-rail monitoring and watchdog; optimized for ultra-low-quiescent applications where RSTIN is unused | Select when only two rails require supervision and sub-µA standby current is mandatory |
Compared with MAX6724UTZWD3-T, the MAX6723UTZWD3-T offers greater interface flexibility with open-drain RST but requires an external pullup; compared with TPS3808G33DBVR, it adds RSTIN monitoring and watchdog functionality at the cost of higher quiescent current, making it suitable for systems needing full triple-rail fault coverage and software supervision.
Availability
MAX6723UTZWD3-T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, battery-powered edge gateways, and consumer set-top boxes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6723UTZWD3-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 power management, sensing, and connectivity in demanding industrial, automotive, and communications applications.
The MAX6715–MAX6729 family delivers compact, low-power supervisory solutions for multivoltage systems - engineered to replace discrete reset circuits with integrated triple-monitoring, watchdog, and manual reset functions in space-constrained designs.
FAQ
What are the factory-trimmed reset thresholds for MAX6723UTZWD3-T?
The MAX6723UTZWD3-T has factory-trimmed VCC1 reset threshold of 3.075V (typ) and VCC2 reset threshold of 2.925V (typ), per the "T" and "S" suffixes in its ordering code. These values are guaranteed over -40°C to +85°C with ±1.5% tolerance and 20ppm/°C tempco. The RSTIN input uses a 626.5mV internal reference, enabling precise third-rail monitoring via external resistor divider. All thresholds are specified in the MAX6715–MAX6729 datasheet Absolute Maximum Ratings and Electrical Characteristics tables.
Does MAX6723UTZWD3-T support watchdog functionality, and what are its timing modes?
Yes, MAX6723UTZWD3-T includes a dual-mode watchdog timer: a 35s minimum startup period after any reset event (power-up, MR, or watchdog timeout) allows full system initialization, followed by a 1.12s minimum normal timeout that begins after the first valid WDI edge. This architecture prevents false timeouts during boot while ensuring rapid detection of software hangs during operation. The WDI pin accepts TTL/CMOS levels and requires ≥50ns pulse width for reliable edge detection.
What is the reset output configuration of MAX6723UTZWD3-T, and how should it be interfaced?
MAX6723UTZWD3-T features an open-drain active-low RST output (Pin 1), requiring an external pullup resistor to a logic-compatible voltage (e.g., VCC1 or I/O rail). This configuration supports bidirectional µP reset pins and mixed-voltage systems. The output sinks ≥1.2mA at VCC ≥ 2.7V with VOL ≤ 0.3V, and exhibits <0.5µA leakage when deasserted. For direct CMOS drive without pullup, consider the pin-compatible MAX6724UTZWD3-T variant with push-pull RST.
How does MAX6723UTZWD3-T ensure reliable reset operation during brownout conditions?
MAX6723UTZWD3-T guarantees valid reset output logic state even when VCC1 or VCC2 drops to 0.8V - significantly below typical reset thresholds. This ensures deterministic reset assertion during gradual brownouts. Additionally, its immunity to short VCC transients (≤20µs at 100mV overdrive) prevents false resets from noise. For operation down to 0V, a 100kΩ pull-down on RST is recommended, though this applies only to push-pull variants; the open-drain RST of MAX6723UTZWD3-T relies on external pullup integrity.
Can MAX6723UTZWD3-T monitor a negative supply voltage?
Yes, MAX6723UTZWD3-T can monitor negative supplies using its PFI-capable RSTIN input in conjunction with an external resistor network, as documented in Figure 3 of the datasheet. By connecting RSTIN to a voltage divider between the negative rail and ground, the 626.5mV internal reference detects undervoltage conditions. When the negative rail magnitude decreases (e.g., -5V → -3V), RSTIN rises above threshold and triggers reset. Accuracy depends on resistor tolerance, PFI input current (<25nA), and reference stability - no additional components beyond the divider are required.
MAX6723UTZWD3-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:
- 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-T FAQ
1.How can I place an order for MAX6723UTZWD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6723UTZWD3-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 MAX6723UTZWD3-T reliable?
The price and inventory of MAX6723UTZWD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6723UTZWD3-T is usually 5 days.
3.What payment methods are accepted for MAX6723UTZWD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6723UTZWD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6723UTZWD3-T?
MAX6723UTZWD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6723UTZWD3-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 MAX6723UTZWD3-T?
For technical support, including MAX6723UTZWD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6723UTZWD3-T requirements.
6.How does Aetrix verify that MAX6723UTZWD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6723UTZWD3-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 MAX6723UTZWD3-T meets industry standards.
7.What is the process for return or replacement of MAX6723UTZWD3-T?
All MAX6723UTZWD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6723UTZWD3-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 MAX6723UTZWD3-T part is unused and in its original packaging.
Return procedure for MAX6723UTZWD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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