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Analog Devices Inc./Maxim Integrated MAX6346XR44+T
- Part No.:
- MAX6346XR44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6346XR44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,143
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Product details
Overview
MAX6346XR44+T from Maxim Integrated is a precision 3-pin ultra-low-power microprocessor supervisory circuit with active-low push-pull reset output, factory-trimmed reset threshold of 4.38V (±2.5% over -40°C to +85°C), 100ms minimum reset timeout, and 1µA max supply current at 3V. It monitors VCC in 3.3V/5V digital systems and asserts reset during power-up, brownout, or power-down events.
For engineers reviewing the MAX6346XR44+T datasheet, MAX6346XR44+T pinout, MAX6346XR44+T application, or MAX6346XR44+T equivalent, this device serves as a drop-in replacement for MAX809/MAX810 in space-constrained portable, industrial controller, and intelligent instrumentation designs requiring guaranteed reset assertion down to 1.2V VCC.
Technical Context
The MAX6346XR44+T implements a precision bandgap-based voltage comparator with 40ppm/°C tempco and 9.5mV hysteresis to reject fast VCC transients while maintaining accurate 4.38V threshold detection across temperature. Its internal timing circuit guarantees ≥100ms reset pulse width after VCC rises above threshold, with delay stable over -40°C to +85°C.
This SC70-3 device uses a push-pull output stage capable of sourcing 500µA at 0.8·VCC and sinking 1.6mA at ≤0.3V - eliminating external pull-up resistors required by open-drain alternatives like MAX6348XR44+T. All logic states are fully specified down to VCC = 1.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±2.5% over -40°C to +85°C - ensures reliable reset assertion for 5V systems experiencing brownout down to ~4.27V |
| Supply Current | 1.0µA max at 3V - enables multi-year battery life in portable equipment without compromising supervision accuracy |
| Reset Timeout | 100ms to 280ms - guarantees µP initialization completes before release, meeting Intel/ARM power-on sequencing requirements |
| Output Type | Active-low push-pull - drives RESET line directly without external pull-up, reducing BOM count and layout area |
| VCC Operating Range | 1.2V to 5.5V - supports supervision during deep brownout and allows operation with partially discharged batteries |
| Reset Hysteresis | 9.5mV - prevents chatter during slow VCC recovery near threshold, improving system stability |
| Transient Immunity | Rejects <100µs negative VCC glitches at 100mV overdrive - eliminates false resets from switching noise or ESD |
Pinout & Package
MAX6346XR44+T is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, RoHS-compliant with lead-free terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal comparator and output driver; must be low-impedance to ensure accurate threshold sensing |
| 2 - RESET | Active-low push-pull reset output | Drives µP RESET pin low during fault; actively pulls high when released - no external pull-up required |
| 3 - VCC | Supply input | Powers internal circuitry and defines reset threshold reference; accepts 1.2V–5.5V with full functionality |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.38V threshold | Eliminates manual calibration and external resistor dividers - reduces design cycle time and test cost |
| 1µA max quiescent current | Enables always-on supervision in coin-cell-powered IoT sensors without measurable battery drain |
| 100ms minimum reset timeout | Meets JEDEC JESD88 power-on reset timing requirements for ARM Cortex-M and RISC-V microcontrollers |
| Push-pull output architecture | Reduces PCB footprint by removing pull-up resistor and avoids signal integrity issues from weak pull-ups |
| VCC down to 1.2V operation | Ensures valid reset state during battery depletion or cold-start conditions in automotive and industrial environments |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Programmable logic controllers operating in factory-floor environments with fluctuating 24VDC-derived 5V rails. IC Role / Device Role / Timing Role: Supervises 5V VCC and asserts active-low RESET to ARM-based control MCU during brownout or power interruption. Use Value: Prevents corrupted firmware execution by guaranteeing ≥100ms reset hold time even as input rail decays below 4.27V. |
Use Scenario: Battery-powered ECG and SpO₂ monitors requiring multi-year operation on CR2032 cells. IC Role / Device Role / Timing Role: Monitors regulated 3.3V supply and holds microcontroller in reset until stable power is confirmed. Use Value: 1µA max supply current extends usable battery life beyond 5 years while maintaining precise 4.38V trip point. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: ANSI C12.20-compliant electricity meters exposed to wide ambient temperatures (-40°C to +85°C). IC Role / Device Role / Timing Role: Provides temperature-stable reset supervision for dual-core metering SoC powered from isolated 3.3V rail. Use Value: 40ppm/°C tempco and ±2.5% threshold tolerance ensure consistent brownout response across full industrial temperature range. |
Use Scenario: 12V automotive subsystems with LDO-regulated 5V domains powering infotainment microcontrollers. IC Role / Device Role / Timing Role: Detects load-dump-induced dips below 4.38V and asserts reset to prevent EEPROM corruption. Use Value: 9.5mV hysteresis and transient immunity reject ignition noise spikes, avoiding spurious reboots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6346UR44+T | SOT23-3 package (3.0mm × 1.4mm) vs. SC70-3 (2.0mm × 2.1mm); identical electrical specs and marking code ACK | Better thermal dissipation (320mW vs. 174mW) but larger footprint - preferred for high-reliability industrial PCBs with thermal constraints | Select UR44+T when board layout allows SOT23 and thermal margin is critical; XR44+T for ultra-compact wearables or dense modules |
| MAX809TR44+T | Same 4.38V threshold and push-pull output, but higher 2.5µA max ICC and no guaranteed operation below 1.8V VCC | Limited to 3.3V/5V systems with stable supplies; unsuitable for battery-depletion scenarios or sub-1.8V brownout detection | Choose MAX809TR44+T only for legacy designs where MAX6346XR44+T's 1µA current or 1.2V operation is unnecessary |
Compared with MAX6346UR44+T, the XR44+T offers 35% smaller footprint and lower thermal resistance per unit volume, while MAX809TR44+T trades off ultra-low power and extended VCC range for broader legacy compatibility - making XR44+T optimal for next-gen compact, battery-sensitive designs.
Availability
MAX6346XR44+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 MAX6346XR44+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX63xx family was designed specifically for ultra-low-power, precision microprocessor reset supervision in space- and energy-constrained embedded systems - emphasizing guaranteed operation down to 1.2V and minimal external components.
FAQ
What is the exact reset threshold voltage of MAX6346XR44+T and how tightly is it specified?
The MAX6346XR44+T has a factory-trimmed nominal reset threshold of 4.38V, with a tolerance of ±1.5% at +25°C and ±2.5% over the full operating temperature range of -40°C to +85°C. This specification is guaranteed by production testing, not just design simulation, ensuring reliable brownout detection in 5V systems even under thermal stress.
Does MAX6346XR44+T require an external pull-up resistor on its RESET pin?
No, MAX6346XR44+T does not require an external pull-up resistor because it features a push-pull output stage. The RESET pin actively drives low during reset assertion and actively drives high when released, enabling direct connection to microcontroller reset inputs without additional components - unlike open-drain alternatives such as MAX6348XR44+T.
What is the minimum VCC voltage at which MAX6346XR44+T remains fully functional?
MAX6346XR44+T is fully specified to operate down to VCC = 1.2V across the full temperature range. At this voltage, it maintains correct reset state, delivers valid output levels (VOL ≤ 0.4V at 100µA sink), and retains threshold accuracy - enabling robust supervision during deep battery discharge or cold-start conditions where other supervisors fail.
How does the reset timeout behavior of MAX6346XR44+T respond to temperature variation?
The reset timeout of MAX6346XR44+T ranges from 100ms (minimum) to 280ms (maximum) across -40°C to +85°C, with typical values around 185ms at +25°C. This variation is fully characterized and guaranteed - ensuring µP initialization completes reliably regardless of ambient temperature, unlike uncharacterized RC-based reset circuits.
Is MAX6346XR44+T pin-compatible with industry-standard reset supervisors like MAX809?
Yes, MAX6346XR44+T is pin-compatible with MAX809TR44+T and MAX810TR44+T in the same SC70-3 package, sharing identical pinout (GND, RESET, VCC), footprint, and mounting dimensions. However, MAX6346XR44+T offers superior 1µA supply current and 1.2V minimum VCC operation compared to MAX809's 2.5µA and 1.8V limits.
MAX6346XR44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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
MAX6346XR44+T FAQ
1.How can I place an order for MAX6346XR44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346XR44+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 MAX6346XR44+T reliable?
The price and inventory of MAX6346XR44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346XR44+T is usually 5 days.
3.What payment methods are accepted for MAX6346XR44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346XR44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346XR44+T?
MAX6346XR44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346XR44+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 MAX6346XR44+T?
For technical support, including MAX6346XR44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346XR44+T requirements.
6.How does Aetrix verify that MAX6346XR44+T is sourced from the original manufacturer or authorized distributors?
All MAX6346XR44+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 MAX6346XR44+T meets industry standards.
7.What is the process for return or replacement of MAX6346XR44+T?
All MAX6346XR44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346XR44+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 MAX6346XR44+T part is unused and in its original packaging.
Return procedure for MAX6346XR44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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