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Analog Devices Inc./Maxim Integrated MAX6732UTLTD3+
- Part No.:
- MAX6732UTLTD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6732UTLTD3+.pdf
- Description:
- IC SUPERVISOR UP SUP CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:469
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Product details
Overview
MAX6732UTLTD3+ from Maxim Integrated is a dual-voltage microprocessor supervisor IC with active-low open-drain reset and watchdog outputs, designed for reliable power monitoring in embedded systems. It monitors VCC1 at +4.625V (±125mV) and VCC2 at +3.075V (±75mV), features a 210ms (typ) reset timeout, operates from -40°C to +85°C, and draws only 14µA typical supply current - ideal for telecom power sequencing and industrial controller brownout protection.
For engineers reviewing the MAX6732UTLTD3+ datasheet, MAX6732UTLTD3+ pinout, MAX6732UTLTD3+ application, or MAX6732UTLTD3+ equivalent, key selection criteria include dual-supply threshold accuracy, open-drain RST/WDO compatibility with legacy µP reset interfaces, 210ms reset timeout suitability for FPGA configuration timing, and SOT23-6 footprint constraints in space-constrained PCB layouts.
Technical Context
The MAX6732UTLTD3+ implements two independent voltage comparators with factory-trimmed thresholds for VCC1 and VCC2, each referenced to an internal bandgap and exhibiting ≤20ppm/°C tempco. Its reset logic asserts RST low when either supply falls below its threshold and holds it for the full D3 timeout period (140–280ms) after recovery.
A dedicated watchdog timer provides dual-mode operation: a 35s (min) startup delay after reset enables safe system initialization, followed by a 1.12s (min) normal timeout period triggered by WDI edge transitions. The open-drain WDO output deasserts immediately upon valid WDI activity or VCC recovery, without timeout delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +4.625V (±125mV) - precise primary supply monitoring for +5V rail brownout detection |
| VCC2 Threshold | +3.075V (±75mV) - accurate secondary supply monitoring for +3.3V I/O rail supervision |
| Reset Timeout | 140–280ms (D3 option) - ensures sufficient hold time for FPGA or DSP boot sequence completion |
| Supply Current | 14µA (typ @ +3.6V) - ultra-low quiescent draw for battery-backed or always-on systems |
| Operating Temp | -40°C to +85°C - fully specified for industrial-grade reliability in harsh environments |
| Package | SOT23-6 - compact 2.9mm × 1.6mm footprint compatible with high-density PCB assembly |
| Reset Output | Active-low open-drain - supports wired-OR reset buses and level-shifting with external pull-up |
Pinout & Package
MAX6732UTLTD3+ uses the 6-pin SOT23-6 package (outline 21-0058), with 0.95mm pitch, 1.6mm width, and 2.9mm length. Thermal resistance θJA = 230°C/W on standard 4-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output - asserts during VCC1/VCC2 undervoltage or watchdog timeout; requires external pull-up |
| 2 | GND | Ground reference - common return path for all internal comparators and logic |
| 3 | WDO | Active-low open-drain watchdog output - signals processor lockup via WDI inactivity; deasserts instantly on valid edge |
| 4 | VCC1 | Primary supply input - powers device and feeds VCC1 comparator; threshold = +4.625V |
| 5 | WDI | Watchdog input - rising/falling edges reset 1.12s timeout; unconnected = no disable |
| 6 | VCC2 | Secondary supply input - feeds VCC2 comparator; threshold = +3.075V |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneous +4.625V and +3.075V thresholds eliminate need for external resistor dividers or discrete supervisors |
| Factory-set D3 timeout | 210ms typical reset pulse width - matches typical FPGA configuration and memory initialization timing windows |
| Independent watchdog output | WDO asserts independently of RST, enabling separate fault logging or watchdog-triggered diagnostics without resetting core logic |
| Immunity to short VCC transients | Withstands <100ns glitches down to 0.8V - prevents spurious resets during switching noise or load dump events |
| Low 14µA supply current | Enables continuous supervision in energy-sensitive applications like remote sensors or backup power circuits |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Sequencing +5V, +3.3V, and +1.8V rails in base station RF modules with strict power-up order requirements. IC Role / Device Role / Timing Role: Dual-threshold supervisor ensures +5V rail stabilizes before enabling +3.3V I/O, using RST as enable signal for downstream LDOs. Use Value: Prevents latch-up and bus contention during cold start by enforcing 210ms minimum hold time between rail assertions. |
Use Scenario: Monitoring main +24V DC input and isolated +5V logic supply in programmable logic controller backplanes. IC Role / Device Role / Timing Role: VCC1 monitors +24V via resistive divider (scaled to +4.625V), VCC2 monitors +5V directly; RST halts CPU execution on undervoltage. Use Value: Guarantees reset assertion down to VCC1 = +0.8V, maintaining deterministic fail-safe behavior even during severe brownout conditions. |
| Network Switch ASIC Boot | Medical Diagnostic Imaging Module |
Use Scenario: Ensuring clean reset release after ASIC firmware loads in 10G Ethernet switch line cards. IC Role / Device Role / Timing Role: WDO monitors ASIC's heartbeat signal; RST held low until both VCC1 (+4.625V) and VCC2 (+3.075V) are stable and WDI toggles. Use Value: Dual-mode watchdog (35s startup + 1.12s normal) avoids false timeout during lengthy ASIC boot while catching runtime hangs. |
Use Scenario: Supervising dual power domains in portable ultrasound imaging subsystems with battery and USB-powered modes. IC Role / Device Role / Timing Role: VCC1 tracks battery voltage (via divider), VCC2 monitors USB +5V; open-drain RST interfaces safely with mixed-voltage µP reset pins. Use Value: 14µA supply current extends battery life; SOT23-6 footprint minimizes board area in handheld form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6732UTLTD5+ | Same VCC1/VCC2 thresholds (+4.625V/+3.075V), but D5 timeout (280–560ms) | Longer reset pulse required for slower booting processors or complex FPGA bitstreams | Select when system boot time exceeds 210ms and requires guaranteed 420ms (typ) reset hold. |
| TPS3808G33DBVR | Single-supply monitor (+3.3V threshold only); no VCC2 input or dual-threshold capability | Only suitable where secondary supply monitoring is handled externally or not required | Choose only if design uses only one monitored rail and prioritizes TI's long-term availability over dual-rail integration. |
Compared with MAX6732UTLTD3+, the MAX6732UTLTD5+ extends reset duration for slower boot sequences without changing pinout or thresholds, while TPS3808G33DBVR reduces functionality to single-rail monitoring - making it a partial substitute only when secondary supply supervision is omitted from the system architecture.
Availability
MAX6732UTLTD3+ is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC controllers, network switch ASIC boot, and medical diagnostic imaging modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6732UTLTD3+ 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 industrial, communications, and computing applications.
The MAX6730–MAX6735 family delivers integrated dual/triple-voltage supervision with independent watchdog outputs, targeting high-reliability embedded systems where deterministic reset behavior and immunity to supply transients are critical.
FAQ
What is the exact VCC1 and VCC2 reset threshold voltage for MAX6732UTLTD3+?
The MAX6732UTLTD3+ has a VCC1 reset threshold of +4.625V (minimum +4.500V, maximum +4.750V) and a VCC2 reset threshold of +3.075V (minimum +3.000V, maximum +3.150V), as defined by the 'LT' suffix in its part number and confirmed in the Electrical Characteristics table of the official datasheet.
Does MAX6732UTLTD3+ include a manual reset input (MR)?
No, MAX6732UTLTD3+ does not include a manual reset input. Per the Selector Guide and Pin Description, only MAX6730/MAX6731/MAX6734/MAX6735 feature MR; MAX6732 and MAX6733 omit this pin to reduce package count and cost in applications where software-controlled reset suffices.
What is the reset timeout period for MAX6732UTLTD3+ and how is it implemented?
MAX6732UTLTD3+ uses the D3 reset timeout option, providing a guaranteed 140ms to 280ms reset pulse width after all monitored supplies exceed their thresholds. This is implemented via an internal RC timer with factory-trimmed capacitance, delivering 210ms typical duration - matching common FPGA configuration timing windows.
Is MAX6732UTLTD3+ compatible with push-pull reset inputs on microprocessors?
MAX6732UTLTD3+ features an open-drain RST output and requires an external pull-up resistor. To interface with a µP having a push-pull reset input, connect a 10kΩ series resistor between RST and the µP's reset pin to prevent logic contention - as explicitly recommended in the Applications Information section of the datasheet.
What watchdog timeout periods does MAX6732UTLTD3+ support?
MAX6732UTLTD3+ supports dual-mode watchdog timing: a minimum 35s initial timeout after reset (for system initialization), followed by a minimum 1.12s normal timeout period (for runtime fault detection). Both periods are fixed and factory-configured - no external components or register programming are needed.
MAX6732UTLTD3+ 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:
- 2
- Voltage - Threshold:
- 3.075V, 4.625V
- 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-6
MAX6732UTLTD3+ FAQ
1.How can I place an order for MAX6732UTLTD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6732UTLTD3+ 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 MAX6732UTLTD3+ reliable?
The price and inventory of MAX6732UTLTD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6732UTLTD3+ is usually 5 days.
3.What payment methods are accepted for MAX6732UTLTD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6732UTLTD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6732UTLTD3+?
MAX6732UTLTD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6732UTLTD3+ 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 MAX6732UTLTD3+?
For technical support, including MAX6732UTLTD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6732UTLTD3+ requirements.
6.How does Aetrix verify that MAX6732UTLTD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6732UTLTD3+ 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 MAX6732UTLTD3+ meets industry standards.
7.What is the process for return or replacement of MAX6732UTLTD3+?
All MAX6732UTLTD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6732UTLTD3+, 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 MAX6732UTLTD3+ part is unused and in its original packaging.
Return procedure for MAX6732UTLTD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6732UTLTD3+ Tags
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MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
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APX803L20-29SA-7
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