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Analog Devices Inc./Maxim Integrated MAX6346XR46+T
- Part No.:
- MAX6346XR46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6346XR46+T.pdf
- Description:
- IC MPU/RESET CIRC 4.63V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:42,500
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Product details
Overview
The MAX6346XR46+T from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with active-low push-pull reset output, factory-trimmed reset threshold of 4.63V (±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current at 3V, and SC70-3 package - used to monitor 5V power rails in embedded controllers and portable systems.
For engineers reviewing the MAX6346XR46+T datasheet, MAX6346XR46+T pinout, MAX6346XR46+T application, or MAX6346XR46+T equivalent, key selection criteria include guaranteed reset assertion down to VCC = 1.2V, immunity to sub-200µs VCC transients at 4.63V threshold, push-pull drive capability (1.6mA sink), and compatibility with µP reset interfaces requiring active-low logic with no external pull-up.
Technical Context
The MAX6346XR46+T implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) and internal timer to generate a clean, temperature-stable reset pulse. Its reset assertion is triggered when VCC falls below 4.63V and held for ≥100ms after VCC rises above threshold, ensuring reliable µP initialization during power-up, brownout, and power-down sequences.
Designed for low-power operation, it draws ≤1µA at 3V and remains functional down to VCC = 1.2V. The push-pull RESET output drives low (≤0.3V at 1.6mA) during reset and high (≥0.8·VCC) otherwise, eliminating need for external pull-up resistors in most applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% over -40°C to +85°C - ensures reliable detection of 5V rail undervoltage before system instability occurs |
| Supply Current | 1.0µA max at 3V - enables multi-year battery life in portable equipment without compromising supervision accuracy |
| Reset Timeout | 100ms min power-on reset pulse width - meets µP minimum reset hold time requirements across temperature |
| Output Type | Active-low push-pull - provides direct interface to µP reset pins without external pull-up resistor |
| VCC Operating Range | 1.2V to 5.5V - guarantees correct reset state even during deep brownout conditions |
| Reset Hysteresis | 9.5mV - prevents chatter during slow VCC recovery near threshold |
| Transient Immunity | Rejects VCC glitches <200µs at 4.63V threshold - avoids false resets from switching noise or ESD coupling |
Pinout & Package
MAX6346XR46+T is housed in a 3-pin SC70-3 package (outline 21-0075), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane for accurate threshold sensing |
| 2 (RESET) | Active-low push-pull reset output | Drives low (≤0.3V @ 1.6mA) during reset; high (≥0.8·VCC) otherwise - directly interfaces µP reset input without pull-up |
| 3 (VCC) | Supply voltage input | Monitored power rail input; device operates from 1.2V–5.5V and asserts reset if VCC drops below 4.63V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.63V threshold | Eliminates manual calibration and external resistor dividers - reduces BOM count and layout area |
| 100ms minimum reset timeout | Guarantees µP core and peripherals are fully initialized before release - prevents race conditions on power-up |
| Ultra-low 1µA supply current | Enables continuous supervision in energy-harvesting and coin-cell-powered devices without measurable battery drain |
| Push-pull active-low output | Removes dependency on external pull-up resistors - simplifies PCB routing and improves noise immunity |
| 1.2V minimum operating voltage | Ensures reset remains asserted through deep brownout events - critical for fail-safe shutdown in industrial systems |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Supervising 5V logic rails in programmable logic controller I/O modules exposed to wide ambient temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset to ARM Cortex-M7 MCU during brownout or cold-start conditions. Use Value: Prevents corrupted register writes and firmware lockup by guaranteeing ≥100ms reset hold time with ±2.5% threshold stability over full temperature range. | Use Scenario: Power-rail monitoring in handheld ECG analyzers powered by single Li-ion cell (3.0–4.2V) with 5V boost converter for analog front-end. IC Role / Device Role / Timing Role: Reset generator tied to boosted 5V rail, asserting reset if boost converter fails or battery sags below safe operating level. Use Value: Ultra-low 1µA quiescent current extends clinical-grade battery runtime beyond 72 hours per charge while maintaining precise 4.63V trip point. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: Monitoring auxiliary 5V supply in DIN-rail mounted electricity meters subject to load-switching transients and EMI. IC Role / Device Role / Timing Role: Brownout detector providing glitch-immune reset to metering SoC during relay switching events. Use Value: 9.5mV hysteresis and transient rejection (<200µs at 4.63V) prevent spurious resets caused by 50/60Hz harmonics or relay contact bounce. | Use Scenario: Reset supervision for infotainment domain controller supplied from vehicle's 5V LDO, operating in harsh automotive environments. IC Role / Device Role / Timing Role: Fail-safe reset source ensuring deterministic boot sequence after ignition cycling or battery disconnect/reconnect. Use Value: Guaranteed operation down to VCC = 1.2V allows reset assertion during cranking events where battery dips to ~6V, causing 5V rail to sag below 4.63V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | Same SC70-3 package, 4.63V threshold, but 1.6µA max ICC and no guaranteed operation below 1.8V | Lacks deep-brownout support; unsuitable for cranking or low-VCC recovery scenarios | Select MAX6346XR46+T when VCC may drop below 1.8V or sub-1µA current is mandatory |
| TPS3808G33DBVR | 3.3V fixed threshold, SOT23-3, 1.8µA ICC, 200ms reset timeout | Not voltage-programmable; requires redesign for 5V rail supervision | Choose MAX6346XR46+T for 4.63V precision on 5V systems without layout change or threshold compromise |
Compared with MAX809TRD3+T and TPS3808G33DBVR, the MAX6346XR46+T uniquely combines 4.63V precision, 1µA max supply current, and guaranteed functionality down to 1.2V - making it the only option among the three that ensures robust reset assertion during severe brownout and ultra-low-power operation.
Availability
MAX6346XR46+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6346XR46+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 industrial, communications, and computing applications, with emphasis on reliability, low power, and integration.
The MAX63xx family delivers ultra-low-power microprocessor supervisory circuits optimized for battery-powered and thermally demanding embedded systems requiring accurate, glitch-immune reset generation.
FAQ
What is the exact reset threshold voltage of the MAX6346XR46+T and how stable is it over temperature?
The MAX6346XR46+T has a factory-trimmed nominal reset threshold of 4.63V, with tolerance of ±1.5% at +25°C and ±2.5% over the full operating temperature range of -40°C to +85°C. Its temperature coefficient is 40ppm/°C, resulting in a maximum drift of approximately ±11.6mV across the full range - sufficient for stable 5V rail supervision without recalibration.
Does the MAX6346XR46+T require an external pull-up resistor on its RESET pin?
No, the MAX6346XR46+T features a push-pull active-low RESET output capable of both sinking 1.6mA and sourcing current up to 0.8·VCC. This eliminates the need for an external pull-up resistor, reducing component count and improving noise immunity compared to open-drain alternatives like the MAX6348XR46+T.
Can the MAX6346XR46+T operate reliably when the VCC supply drops below 2.0V?
Yes, the MAX6346XR46+T is fully specified to operate and assert reset correctly down to VCC = 1.2V. This deep-brownout capability ensures deterministic reset behavior during automotive cranking events or battery depletion scenarios where the 5V rail collapses well below typical logic thresholds.
What is the minimum reset pulse width guaranteed by the MAX6346XR46+T, and is it temperature-stable?
The MAX6346XR46+T guarantees a minimum reset timeout of 100ms after VCC rises above the 4.63V threshold, with typical values ranging from 100ms to 280ms depending on temperature and unit variation. This timing is generated by an internal RC oscillator and remains functional across -40°C to +85°C without external components.
How does the MAX6346XR46+T reject fast transients on the VCC line?
The MAX6346XR46+T incorporates comparator hysteresis (9.5mV) and internal filtering to ignore VCC transients shorter than ~200µs when the threshold is set to 4.63V. This immunity is documented in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph in the datasheet and prevents false resets from switching noise or ESD-induced glitches.
MAX6346XR46+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6346XR46+T FAQ
1.How can I place an order for MAX6346XR46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346XR46+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 MAX6346XR46+T reliable?
The price and inventory of MAX6346XR46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346XR46+T is usually 5 days.
3.What payment methods are accepted for MAX6346XR46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346XR46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346XR46+T?
MAX6346XR46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346XR46+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 MAX6346XR46+T?
For technical support, including MAX6346XR46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346XR46+T requirements.
6.How does Aetrix verify that MAX6346XR46+T is sourced from the original manufacturer or authorized distributors?
All MAX6346XR46+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 MAX6346XR46+T meets industry standards.
7.What is the process for return or replacement of MAX6346XR46+T?
All MAX6346XR46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346XR46+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 MAX6346XR46+T part is unused and in its original packaging.
Return procedure for MAX6346XR46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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