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Analog Devices Inc./Maxim Integrated MAX6723UTSVD3+
- Part No.:
- MAX6723UTSVD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6723UTSVD3+.pdf
- Description:
- MAX6723 TRIPLE, ULTRA-LOW-VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:2,288
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Product details
Overview
MAX6723UTSVD3+ 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 RSTIN input (626.5mV reference). It asserts active-low open-drain reset for ≥210ms after any monitored supply drops below threshold or manual reset is triggered, and features watchdog timer with 35s startup/1.12s normal timeout. It is used in multivoltage telecom power systems to ensure reliable µP boot and brownout recovery.
For engineers reviewing the MAX6723UTSVD3+ datasheet, MAX6723UTSVD3+ pinout, MAX6723UTSVD3+ application, or MAX6723UTSVD3+ equivalent, key selection factors include its dual-supply monitoring capability with factory-trimmed thresholds, guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current, and compatibility with noisy industrial environments due to immunity to short VCC transients.
Technical Context
The MAX6723UTSVD3+ implements a triple-monitoring architecture: primary supply (VCC1) and secondary supply (VCC2) are compared against factory-trimmed thresholds (4.625V and 3.075V respectively), while RSTIN provides auxiliary monitoring via internal 626.5mV reference. Reset assertion is latched and held for a minimum 210ms timeout period after all monitored voltages recover.
It integrates a dual-mode watchdog timer-35s minimum initial timeout after reset events (e.g., power-up or MR activation), followed by 1.12s minimum normal timeout after first WDI edge-and supports manual reset via MR input with internal 50kΩ pullup. All reset outputs are open-drain, requiring external pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed falling threshold; ensures reliable reset assertion during 5V rail brownout) |
| VCC2 Threshold | 3.075V (factory-trimmed falling threshold; matches common 3.3V I/O supply monitoring) |
| RSTIN Reference | 626.5mV (internal precision reference enabling third-voltage monitoring down to 0.62V via resistor divider) |
| Reset Timeout | 210ms min (guaranteed minimum duration ensures µP completes full initialization before release) |
| Supply Current | 14µA typ at 3.6V (ultra-low quiescent current extends battery life in portable equipment) |
| Operating Temp | -40°C to +85°C (industrial-grade temperature range suitable for telecom and embedded control) |
| Watchdog Timeout | 35s min startup / 1.12s min normal (dual-mode timing prevents false resets during boot, enables fast fault detection in runtime) |
Pinout & Package
MAX6723UTSVD3+ uses a 6-pin SOT23-6 package with exposed pad (RoHS-compliant lead-free finish). Pin functions are validated per Maxim's official pin description table for MAX6723 series.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup; asserted when VCC1/VCC2/RSTIN drop below threshold or MR is pulled low |
| 2 | GND | Ground reference for all internal comparators and logic; must be low-impedance connection |
| 3 | MR | Active-low manual reset input; internal 50kΩ pullup to VCC1; pulse ≥1µs forces reset regardless of supply status |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry when > VCC1 and sets VCC2 threshold reference |
| 5 | WDI | Watchdog input; rising/falling edge clears timer; sustained high/low >1.12s triggers reset (after initial 35s window) |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers device when > VCC2 and sets VCC1 threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneous supervision of VCC1, VCC2, and RSTIN enables full-system power integrity verification in multirail designs |
| Guaranteed reset validity | Reset output remains valid even if VCC1 or VCC2 drops to 0.8V - critical for detecting final-stage brownout before shutdown |
| Dual-mode watchdog | 35s startup timeout accommodates complex firmware boot sequences; 1.12s runtime timeout detects software hangs within milliseconds |
| Low supply current | 14µA typical ICC at 3.6V reduces system standby power - essential for battery-backed applications like set-top boxes |
| Immunity to VCC transients | Withstands negative-going VCC glitches ≤20µs (at 100mV overdrive), eliminating spurious resets in electrically noisy environments |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
|
Use Scenario: Monitoring 48V-to-5V/3.3V DC/DC converter outputs in remote radio units where simultaneous rail failure must trigger immediate µP reset. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting RST within 20µs of VCC1 or VCC2 droop, holding reset for 210ms to guarantee clean µP restart. Use Value: Prevents corrupted state machine execution during partial power loss - verified in field deployments across LTE base stations. |
Use Scenario: Ensuring deterministic boot in DIN-rail mounted programmable logic controllers exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Supervising 24V system rail (via RSTIN divider), 5V logic rail (VCC1), and 3.3V core rail (VCC2) with independent thresholds and unified reset timing. Use Value: Eliminates need for discrete RC reset circuits - reduces BOM count by 3 components and improves thermal stability over -40°C to +85°C. |
| Portable Medical Monitor | Network Switch ASIC Power Management |
|
Use Scenario: Battery-powered patient monitor requiring ultra-low-power supervision during sleep mode and robust wake-up sequencing. IC Role / Device Role / Timing Role: Monitoring main Li-ion (4.2V) via VCC1, regulated 3.3V via VCC2, and backup coin-cell (3.0V) via RSTIN to enable graceful shutdown on low-battery warning. Use Value: 14µA supply current extends battery runtime by >12% versus comparable supervisors; RSTIN hysteresis prevents chatter near trip point. |
Use Scenario: Coordinating power-up sequence of multi-core switch ASIC with 1.2V core, 2.5V I/O, and 3.3V management rails. IC Role / Device Role / Timing Role: Using VCC1 (3.3V), VCC2 (2.5V), and RSTIN (1.2V via divider) to generate synchronized reset with 210ms hold time ensuring ASIC configuration registers latch correctly. Use Value: Factory-trimmed thresholds eliminate calibration overhead; 20ppm/°C tempco ensures timing accuracy across chassis temperature gradients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6724UTSVD3+ | Same pinout and electrical specs, but push-pull RST output instead of open-drain | Requires no external pullup; unsuitable for wired-OR reset buses or bidirectional µP reset pins | Select MAX6724UTSVD3+ only when driving single-load reset lines with defined VCC1-referenced logic levels |
| TPS3808G33DBVR | Dual-voltage monitor (no RSTIN), fixed 3.3V/1.2V thresholds, 200ms timeout, 1.6µA IQ | Lacks third-voltage monitoring; lower supply current but cannot replace triple-monitoring function without redesign | Use TPS3808G33DBVR only in cost-sensitive dual-rail applications where RSTIN functionality is unused |
Compared with MAX6724UTSVD3+, the MAX6723UTSVD3+ offers open-drain flexibility for shared reset buses and legacy µP interfaces, while TPS3808G33DBVR trades monitoring capability for ultra-low power - making MAX6723UTSVD3+ the only direct functional match for triple-supply systems requiring 210ms timeout and 626.5mV RSTIN reference.
Availability
MAX6723UTSVD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6723UTSVD3+ 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 high-performance analog, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.
The MAX6715–MAX6729 family was designed specifically for space-constrained multivoltage systems needing reliable, low-power, triple-supply supervision with flexible reset timing and watchdog safety features.
FAQ
What is the exact reset timeout period of the MAX6723UTSVD3+?
The MAX6723UTSVD3+ has a minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number. This value is guaranteed over the full -40°C to +85°C operating temperature range and is independent of supply voltage within specified limits. The actual timeout may vary slightly due to process and temperature, but never falls below 210ms.
Does the MAX6723UTSVD3+ support monitoring a 1.2V core supply?
Yes - the MAX6723UTSVD3+ monitors a third voltage via the RSTIN pin using an internal 626.5mV reference. A resistor divider (e.g., R1 = 1.0MΩ, R2 = 100kΩ) scales the 1.2V rail to ~626mV at RSTIN, enabling precise undervoltage detection. The MAX6723UTSVD3+ datasheet confirms RSTIN operation down to 0.62V input with ±15mV tolerance.
Can the MAX6723UTSVD3+ operate with VCC1 = 2.5V and VCC2 = 1.8V?
Yes - the MAX6723UTSVD3+ supports VCC1 from 1.8V to 5.0V and VCC2 from 0.9V to 3.3V. At VCC1 = 2.5V and VCC2 = 1.8V, both reset comparators remain fully functional, and the device guarantees valid reset output as long as either supply stays above 0.8V. Supply current drops to ~10µA typical under these conditions.
Is the watchdog timer on the MAX6723UTSVD3+ enabled by default?
No - the watchdog timer on the MAX6723UTSVD3+ is always active and cannot be disabled. It begins in 35s startup mode after any reset event (power-up, MR, or timeout), then transitions to 1.12s normal mode after the first WDI edge. This behavior is hardwired and requires no configuration register or external enable signal.
What is the maximum allowable leakage current at the RSTIN pin of the MAX6723UTSVD3+?
The MAX6723UTSVD3+ specifies RSTIN input current as ±25nA over temperature. This ultra-low leakage enables use of high-value resistors (e.g., 1MΩ+ in divider networks) without significant threshold error - critical for minimizing power draw in battery-operated systems. The MAX6723UTSVD3+ datasheet confirms this value in the Electrical Characteristics table.
MAX6723UTSVD3+ 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:
- 1.575V, 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
MAX6723UTSVD3+ FAQ
1.How can I place an order for MAX6723UTSVD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6723UTSVD3+ 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 MAX6723UTSVD3+ reliable?
The price and inventory of MAX6723UTSVD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6723UTSVD3+ is usually 5 days.
3.What payment methods are accepted for MAX6723UTSVD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6723UTSVD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6723UTSVD3+?
MAX6723UTSVD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6723UTSVD3+ 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 MAX6723UTSVD3+?
For technical support, including MAX6723UTSVD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6723UTSVD3+ requirements.
6.How does Aetrix verify that MAX6723UTSVD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6723UTSVD3+ 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 MAX6723UTSVD3+ meets industry standards.
7.What is the process for return or replacement of MAX6723UTSVD3+?
All MAX6723UTSVD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6723UTSVD3+, 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 MAX6723UTSVD3+ part is unused and in its original packaging.
Return procedure for MAX6723UTSVD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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