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Analog Devices Inc./Maxim Integrated MAX6723UTSHD3+
- Part No.:
- MAX6723UTSHD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6723UTSHD3+.pdf
- Description:
- MAX6723 TRIPLE, ULTRA-LOW-VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:1,847
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Product details
Overview
MAX6723UTSHD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference). It asserts an active-low open-drain reset output with 210ms minimum timeout, guaranteed valid down to VCC1 or VCC2 = 0.8V, and supports manual reset and watchdog timer functions for embedded power management in multivoltage systems.
For engineers reviewing the MAX6723UTSHD3+ datasheet, MAX6723UTSHD3+ pinout, MAX6723UTSHD3+ application, or MAX6723UTSHD3+ equivalent, key selection criteria include dual-supply monitoring capability, 210ms reset timeout, RSTIN-adjustable third-voltage supervision, open-drain reset output logic, and guaranteed operation at ultralow supply voltages (≥0.8V).
Technical Context
The MAX6723UTSHD3+ integrates three independent voltage monitors: factory-trimmed VCC1 and VCC2 thresholds (4.625V and 3.075V respectively), plus an external RSTIN comparator referenced to a 626.5mV internal bandgap. Reset assertion occurs when any monitored voltage falls below its threshold and remains asserted for a minimum 210ms timeout after all supplies recover.
It features an open-drain RST output, manual reset (MR) input with internal 50kΩ pullup to VCC1, and a watchdog input (WDI) supporting dual-mode timing-35s startup period followed by 1.12s normal timeout-enabling robust processor activity monitoring during boot and runtime.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±125mV tolerance); ensures reliable reset initiation on primary 4.6V–5V rails |
| VCC2 Threshold | 3.075V (factory-trimmed, ±75mV tolerance); enables precise supervision of secondary 3.3V/3.0V system supplies |
| RSTIN Reference | 626.5mV (internal bandgap); allows external resistor-divider to monitor auxiliary voltages down to 0.62V |
| Reset Timeout | 210ms (minimum); provides sufficient hold time for microprocessor initialization and memory stabilization |
| Supply Current | 14µA typical at 3.6V; minimizes quiescent power draw in battery-operated and low-power systems |
| Operating Temp | -40°C to +85°C; qualified for industrial and telecom equipment operating in extended ambient conditions |
| Reset Output | Active-low open-drain; requires external pullup, compatible with bidirectional µP reset pins and mixed-voltage I/O |
Pinout & Package
MAX6723UTSHD3+ is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free (+T suffix), with thermal pad not connected internally.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; asserted when VCC1/VCC2/RSTIN drop below thresholds or MR is pulled low |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual reset input; internal 50kΩ pullup to VCC1; resets system on button press or logic low |
| 4 | VCC2 | Secondary supply input; powers internal circuitry when > VCC1 and sets VCC2 monitor reference |
| 5 | VCC1 | Primary supply input; powers device when > VCC2 and defines VCC1 monitor threshold and RST output reference |
| 6 | RSTIN | Adjustable undervoltage monitor input; high-impedance node referenced to 626.5mV internal reference |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneous monitoring of VCC1 (4.625V), VCC2 (3.075V), and RSTIN (adjustable via resistor divider) |
| Guaranteed reset validity | Reset output remains logically valid even when VCC1 or VCC2 drops to 0.8V-critical for brownout recovery |
| Dual-mode watchdog timer | 35s startup timeout (for boot sequences) + 1.12s normal timeout (for runtime fault detection) |
| Low-glitch immunity | Immune to short VCC transients (<20µs at 100mV overdrive); prevents spurious resets in noisy power environments |
| Ultra-low quiescent current | 14µA typical at 3.6V; extends battery life in portable equipment without compromising supervision accuracy |
Applications
| Industrial PLC Power Sequencing | Telecom Line Card Voltage Monitoring |
|---|---|
|
Use Scenario: Supervising 48V DC-DC converter outputs (5V, 3.3V, 1.2V) in carrier-grade line cards with strict power-up sequencing requirements. IC Role / Device Role / Timing Role: Triple-voltage supervisor ensuring coordinated reset assertion across multiple rail domains before FPGA and DSP initialization. Use Value: Prevents partial configuration and latch-up by enforcing 210ms minimum reset hold time while enabling independent RSTIN monitoring of core voltage. |
Use Scenario: Monitoring redundant 12V backup supplies and isolated 3.3V control rails in optical transport modules subject to rapid voltage sags. IC Role / Device Role / Timing Role: Dual-supply supervisor with MR input for field-service reset and RSTIN for auxiliary bias rail supervision. Use Value: Guarantees reset validity down to 0.8V on either supply, eliminating false releases during brownout events common in telecom infrastructure. |
| Medical Portable Diagnostic Device | Automotive Infotainment Power Management |
|
Use Scenario: Managing Li-ion battery-powered subsystems (3.3V MCU, 1.8V sensor interface, 2.8V display driver) in handheld ultrasound units. IC Role / Device Role / Timing Role: Low-current triple supervisor providing RSTIN-adjustable monitoring of battery voltage via resistor divider. Use Value: 14µA supply current extends operational runtime; 626.5mV RSTIN reference enables accurate low-battery warning at 3.0V cutoff. |
Use Scenario: Supervising 5V infotainment SoC, 3.3V CAN transceiver, and 1.1V DDR memory rails in automotive head units exposed to cold-crank transients. IC Role / Device Role / Timing Role: Industrial-temperature supervisory IC with glitch-immune reset generation during engine start. Use Value: Immunity to sub-20µs VCC transients prevents unintended resets during 4.5V cold-crank events, ensuring continuous audio/video playback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6724UTSHD3+ | Push-pull RST output (vs. open-drain); same thresholds, timeout, and pinout | Requires no external pullup; incompatible with bidirectional µP reset pins without series resistor | Select when driving CMOS inputs directly or when board space prohibits external pullup components |
| TPS3808G33DBVR | Dual-supply only (VDD, VDD1); no RSTIN input; fixed 3.3V/1.6V thresholds; 200ms timeout | Lacks third-voltage monitoring; unsuitable for systems requiring auxiliary rail supervision | Choose only if RSTIN functionality is unnecessary and design uses exactly 3.3V/1.6V rails |
Compared with MAX6724UTSHD3+, the MAX6723UTSHD3+ offers open-drain flexibility for mixed-voltage interfaces but requires a pullup; versus TPS3808G33DBVR, it delivers critical RSTIN-based third-rail monitoring essential for complex multivoltage systems.
Availability
MAX6723UTSHD3+ is available at Aetrix Electronics and suitable for industrial PLC power sequencing, telecom line card voltage monitoring, and medical portable diagnostic devices requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6723UTSHD3+ 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 and communications applications.
The MAX6715–MAX6729 family delivers ultra-low-voltage supervisory circuits optimized for multivoltage embedded systems where reliability, small footprint, and sub-1V reset validity are mandatory.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6723UTSHD3+?
The MAX6723UTSHD3+ has a factory-trimmed VCC1 reset threshold of 4.625V, with a tolerance of ±125mV (4.500V to 4.750V) over temperature. This value is encoded in the "SH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is verified across the full -40°C to +85°C operating range. The MAX6723UTSHD3+ uses this precise threshold to supervise 5V system rails while maintaining margin against ripple and noise.
Does the MAX6723UTSHD3+ support watchdog functionality?
No, the MAX6723UTSHD3+ does not include a watchdog input (WDI). Per Maxim's Selector Guide, MAX6723 devices are triple-voltage supervisors with RSTIN and MR inputs but no WDI pin. Watchdog capability is present only in MAX6721–MAX6729 variants marked with "√" under the WATCHDOG INPUT column-specifically MAX6725 through MAX6729. For watchdog-enabled alternatives, consider MAX6725KA–D3+ or MAX6729KA–D3+.
What is the function of the RSTIN pin on the MAX6723UTSHD3+?
The RSTIN pin on the MAX6723UTSHD3+ is a high-impedance input referenced to an internal 626.5mV bandgap voltage. When the voltage at RSTIN falls below this reference, the device asserts the RST output. Users configure the trip point using an external resistor divider-for example, to monitor a 3.3V rail at 2.5V or a battery at 3.0V. RSTIN draws only ±25nA, enabling high-resistance dividers that minimize system power consumption.
Is the MAX6723UTSHD3+ pin-compatible with other MAX67xx SOT23-6 variants?
Yes, the MAX6723UTSHD3+ shares the identical 6-pin SOT23-6 pinout with all MAX6715–MAX6724 SOT23-6 variants (e.g., MAX6715UT–, MAX6720UT–). Pin 1 is RST, Pin 2 is GND, Pin 3 is MR, Pin 4 is VCC2, Pin 5 is VCC1, and Pin 6 is RSTIN. However, functional compatibility depends on feature set: MAX6723UTSHD3+ includes RSTIN but excludes WDI and PFI/PFO, unlike MAX6728/MAX6729.
What is the minimum supply voltage at which the MAX6723UTSHD3+ guarantees valid reset output logic?
The MAX6723UTSHD3+ guarantees correct reset output logic state when either VCC1 or VCC2 remains greater than 0.8V-verified across the full -40°C to +85°C temperature range. This ultralow valid-supply specification ensures reliable brownout detection and controlled shutdown in systems experiencing severe voltage sag, such as automotive cold-crank or battery-depleted portable devices. Below 0.8V, reset behavior is not guaranteed.
MAX6723UTSHD3+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.313V, 2.925V, 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-23-6
MAX6723UTSHD3+ FAQ
1.How can I place an order for MAX6723UTSHD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6723UTSHD3+ 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 MAX6723UTSHD3+ reliable?
The price and inventory of MAX6723UTSHD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6723UTSHD3+ is usually 5 days.
3.What payment methods are accepted for MAX6723UTSHD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6723UTSHD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6723UTSHD3+?
MAX6723UTSHD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6723UTSHD3+ 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 MAX6723UTSHD3+?
For technical support, including MAX6723UTSHD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6723UTSHD3+ requirements.
6.How does Aetrix verify that MAX6723UTSHD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6723UTSHD3+ 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 MAX6723UTSHD3+ meets industry standards.
7.What is the process for return or replacement of MAX6723UTSHD3+?
All MAX6723UTSHD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6723UTSHD3+, 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 MAX6723UTSHD3+ part is unused and in its original packaging.
Return procedure for MAX6723UTSHD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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