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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:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,993
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Product details
Overview
The MAX6723UTSHD3 from Maxim Integrated is a dual-voltage, ultra-low-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, adjustable RSTIN input (626.5mV reference), and watchdog timer (35s startup / 1.12s normal mode). It ensures reliable system reset during power-supply faults in battery-powered and industrial embedded systems.
For engineers reviewing the MAX6723UTSHD3 datasheet, MAX6723UTSHD3 pinout, MAX6723UTSHD3 application, or MAX6723UTSHD3 equivalent, key selection criteria include dual-supply monitoring capability down to 0.8V VCC operation, factory-trimmed reset thresholds, RSTIN-adjustable third-voltage support, watchdog disable via open WDI, and guaranteed push-pull active-low RST output referenced to VCC1.
Technical Context
The MAX6723UTSHD3 implements dual independent voltage comparators for VCC1 and VCC2, each with 0.5% hysteresis and 20ppm/°C tempco, plus a dedicated high-impedance RSTIN comparator with 626.5mV internal reference and 3mV hysteresis. Its reset logic asserts RST low when any monitored supply falls below its threshold or MR is pulled low, maintaining assertion for 210ms min after recovery.
It integrates a dual-mode watchdog timer: 35s minimum startup period after reset to accommodate boot sequences, followed by 1.12s minimum normal timeout triggered by missing WDI transitions. The device operates across -40°C to +125°C with supply current as low as 14µA at 3.6V, and guarantees valid reset output state down to VCC1 or VCC2 = 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed falling threshold; ensures reset assertion before 4.63V supply collapse) |
| VCC2 Threshold | 3.075V (factory-trimmed falling threshold; monitors secondary 3.3V rail with 75mV hysteresis margin) |
| RSTIN Reference | 626.5mV (internal precision reference enabling external resistor-divider for third-voltage monitoring down to 0.62V) |
| Reset Timeout | 210ms (minimum guaranteed delay; prevents premature processor release during slow-rising supplies) |
| Watchdog Period | 35s startup / 1.12s normal (dual-mode timing supports full system boot then rapid fault detection) |
| Supply Current | 14µA typical at 3.6V (ultra-low quiescent current extends battery life in portable equipment) |
| Operating Temp | -40°C to +125°C (supports automotive under-hood and industrial control environments) |
Pinout & Package
MAX6723UTSHD3 is housed in a 6-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserts low on VCC1/VCC2/RSTIN fault or MR low; holds for 210ms min after recovery |
| 2 | GND | Ground reference for all internal comparators, timers, and outputs; must be low-impedance connection |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; forces reset when pulled low; debounced internally |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry when above VCC1 and sets VCC2 threshold reference |
| 5 | VCC1 | Primary supply input (1.8V–5.0V range); powers device when above VCC2 and sets primary reset threshold |
| 6 | RSTIN | Adjustable undervoltage monitor input; compares external divided voltage against 626.5mV reference; high-impedance (±100nA) |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitoring | Simultaneous 4.625V (VCC1) and 3.075V (VCC2) thresholds eliminate external resistors and calibration effort |
| Adjustable third-voltage supervision | RSTIN input with 626.5mV reference enables precise monitoring of auxiliary rails (e.g., 1.2V, 1.8V) using two external resistors |
| Dual-mode watchdog timer | 35s startup window accommodates full firmware initialization; 1.12s normal timeout detects runtime hangs without false triggers |
| Guaranteed reset validity to 0.8V | Ensures correct RST logic state even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V |
| Immunity to short VCC transients | Rejects sub-20µs negative glitches up to 100mV below threshold-reduces spurious resets in noisy power environments |
Applications
| Industrial PLC Power Monitoring | Battery-Powered IoT Sensor Node |
|---|---|
Use Scenario: Monitors 24V DC input (via resistor divider) and 3.3V logic rail in programmable logic controller modules. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RST during undervoltage on either rail; RSTIN used for 24V-to-626mV scaled monitoring. Use Value: Prevents PLC firmware corruption during line sags by holding µP in reset until both supplies stabilize above 4.625V and 3.075V respectively. |
Use Scenario: Supervises coin-cell (3.0V) and regulated 1.8V core supply in wireless sensor endpoint with ultra-low-power MCU. IC Role / Device Role / Timing Role: VCC1 monitors battery voltage; VCC2 tracks LDO output; RSTIN unused; watchdog disabled via open WDI. Use Value: 14µA supply current minimizes standby drain; 210ms timeout avoids reset during brief RF transmit current spikes. |
| Automotive Infotainment Head Unit | Medical Portable Diagnostic Device |
Use Scenario: Tracks 5V main supply and 1.2V SoC core rail in infotainment head unit operating across -40°C to +105°C ambient. IC Role / Device Role / Timing Role: Push-pull RST drives µP reset pin directly; MR connected to service button; watchdog enabled for software hang detection. Use Value: -40°C to +125°C rating ensures reliability in hot vehicle cabins; 35s watchdog startup allows full boot sequence before monitoring begins. |
Use Scenario: Ensures safe shutdown during battery depletion in handheld ultrasound device with dual Li-ion cells and 3.3V/1.1V rails. IC Role / Device Role / Timing Role: VCC1 monitors battery pack (via RSTIN divider); VCC2 monitors 3.3V system rail; PFO unused; MR tied to emergency reset switch. Use Value: Factory-trimmed thresholds guarantee consistent trip points across production units; 0.8V VCC operation maintains reset integrity during final battery discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720UTSHD3 | Same 6-pin SOT23 package, identical 4.625V/3.075V thresholds and 210ms timeout, but lacks RSTIN input and watchdog timer | No third-voltage monitoring or watchdog functionality; suitable only for strict dual-rail systems without auxiliary monitoring needs | Select MAX6720UTSHD3 if RSTIN and WDI features are unnecessary and lowest BOM cost is prioritized |
| TPS3808G33DBVR | 3.3V fixed VDD threshold, no VCC2 monitoring, no RSTIN, 200ms timeout, 2.5µA supply current, SOT23-6 package | Single-supply only; requires external circuitry for dual-rail monitoring; lower quiescent current but no secondary rail support | Choose TPS3808G33DBVR only for single 3.3V rail supervision where ultra-low ICC is critical and dual monitoring is handled externally |
Compared with MAX6720UTSHD3 and TPS3808G33DBVR, the MAX6723UTSHD3 uniquely delivers integrated dual-rail monitoring, adjustable third-rail supervision via RSTIN, and dual-mode watchdog-all in one 6-pin SOT23, eliminating discrete components and layout complexity for multi-rail systems.
Availability
MAX6723UTSHD3 is available at Aetrix Electronics and suitable for industrial automation, battery-powered medical devices, automotive infotainment, and telecom edge equipment requiring stable component supply across extended temperature ranges.
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 demanding performance, reliability, and integration requirements in industrial, automotive, and communications markets.
The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits targeting space- and power-constrained embedded systems needing dual/triple supply monitoring with guaranteed operation down to 0.8V VCC.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6723UTSHD3?
The MAX6723UTSHD3 has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, specified as falling thresholds with ±12.5mV tolerance over temperature. These values are encoded in the part number suffix "SH" per Maxim's Reset Voltage Threshold Suffix Guide and are verified across the full -40°C to +125°C operating range.
Does the MAX6723UTSHD3 support watchdog functionality, and how is it configured?
Yes, the MAX6723UTSHD3 includes a dual-mode watchdog timer with 35s minimum startup period and 1.12s minimum normal timeout. To enable it, connect WDI to a microcontroller I/O pin that toggles regularly; to disable, leave WDI unconnected-the internal 200nA current source detects the open state and disables watchdog operation.
Can the MAX6723UTSHD3 monitor a third voltage rail, and what is the reference voltage for RSTIN?
Yes, the MAX6723UTSHD3 supports third-rail monitoring via the RSTIN pin, which uses an internal 626.5mV reference voltage (±15.5mV over temperature). An external resistor divider scales the target rail voltage to match this reference, enabling precise supervision of voltages as low as 0.62V with high-impedance input (±100nA leakage).
What is the reset output type and drive capability of the MAX6723UTSHD3?
The MAX6723UTSHD3 provides a push-pull active-low RST output referenced to VCC1, capable of sinking 3.2mA at VCC1 ≥ 4.5V with VOL ≤ 0.4V. It does not require an external pullup resistor and directly interfaces with standard CMOS reset inputs, ensuring robust noise immunity and fast rise/fall times.
How does the MAX6723UTSHD3 ensure reliable reset operation during low-supply conditions?
The MAX6723UTSHD3 guarantees valid reset output logic state down to VCC1 or VCC2 = 0.8V, verified across temperature. This ensures deterministic behavior during brownout events where supply rails decay slowly, preventing undefined µP states and enabling controlled shutdown sequences in safety-critical applications.
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:
- Multi-Voltage Supervisor
- 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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