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Analog Devices Inc./Maxim Integrated MAX6348XR44+T
- Part No.:
- MAX6348XR44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6348XR44+T.pdf
- Description:
- IC MPU/RESET CIRC 4.38V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6348XR44+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 4.38V power supplies in embedded systems. It asserts reset when VCC falls below 4.38V (±2.5% over temperature), holds reset for ≥100ms after recovery, draws ≤1µA supply current, and operates from 1.2V to 5.5V across –40°C to +85°C - used in portable battery-powered µP systems requiring reliable brownout detection.
For engineers reviewing the MAX6348XR44+T datasheet, MAX6348XR44+T pinout, MAX6348XR44+T application, or MAX6348XR44+T equivalent, key selection criteria include its factory-trimmed 4.38V reset threshold, SC70-3 open-drain output, ultra-low 1µA quiescent current, guaranteed reset assertion down to 1V VCC, and immunity to fast VCC transients up to 100V/µs.
Technical Context
The MAX6348XR44+T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 9.5mV hysteresis, ensuring stable threshold behavior across industrial temperature range. Its open-drain RESET output interfaces directly with bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pull-up resistor.
Reset timeout is internally timed to guarantee ≥100ms minimum pulse width after VCC exceeds VTH, with typical power-up delay of 185ms and maximum of 280ms. The device ignores negative-going VCC transients shorter than values shown in the Maximum Transient Duration vs. Reset Threshold Overdrive graph - critical for noisy power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±2.5% over –40°C to +85°C - ensures reliable detection of 4.38V supply brownout without false triggers |
| Supply Current | ≤1.0µA at +25°C - enables multi-year operation in coin-cell–powered devices |
| Reset Timeout | 100ms (min) to 280ms (max) - guarantees sufficient processor initialization time after power recovery |
| Output Type | Open-drain RESET - supports wired-OR configurations and bidirectional µP reset pins |
| VCC Range | 1.2V to 5.5V - allows operation during deep brownout and compatibility with 1.2V–5V logic domains |
| Transient Immunity | Rated for VCC slew rates up to 100V/µs - suppresses false resets from switching noise or ESD-induced glitches |
| Reset Hysteresis | 9.5mV - prevents oscillation near threshold during slow-rising/falling VCC conditions |
Pinout & Package
MAX6348XR44+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 for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 | RESET | Active-low open-drain output; requires external pull-up resistor to VCC or another logic rail; sinks ≥1.6mA when asserted |
| 3 | VCC | Power supply input; monitors voltage level and powers internal circuitry; accepts 1.2V–5.5V with full functionality |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.38V with ±1.5% tolerance at +25°C and ±2.5% over full temperature range - eliminates manual calibration |
| Ultra-low quiescent current | 1µA max across temperature - extends battery life in always-on monitoring applications |
| Open-drain output architecture | Enables direct interface with bidirectional µP reset pins (e.g., 68HC11) and shared reset bus configurations |
| Guaranteed reset state down to 1V VCC | Ensures valid reset assertion even during severe brownout or partial power loss conditions |
| Transient-immune comparator design | Rejects VCC glitches <100µs wide (depending on overdrive), preventing spurious resets in electrically noisy environments |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered wearable ECG sensor operating from a 4.2V Li-ion cell with aging-related voltage droop. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M0 MCU when cell voltage drops below 4.38V. Use Value: Prevents firmware corruption during undervoltage operation while consuming only 1µA - enabling >5-year shelf life on primary cell. | Use Scenario: DIN-rail mounted analog input module exposed to 24VDC supply fluctuations in factory automation. IC Role / Device Role / Timing Role: Brownout detector generating 185ms reset pulse to safeguard FPGA configuration memory during line sags. Use Value: 9.5mV hysteresis and 100V/µs transient immunity eliminate false resets caused by relay coil kickback or motor drive noise. |
| Smart Meter Data Loggers | Automotive Body Control Units |
Use Scenario: AMI smart meter storing consumption data to FRAM during utility grid interruptions. IC Role / Device Role / Timing Role: Voltage supervisor holding µC in reset until 4.38V rail stabilizes post-blackout, ensuring safe write completion. Use Value: Guaranteed 100ms minimum reset timeout provides deterministic timing margin for nonvolatile memory write cycles. | Use Scenario: 12V-to-5V powered BCM managing door locks and lighting, subject to load-dump transients. IC Role / Device Role / Timing Role: Open-drain reset generator interfacing with Infineon AURIX™ TRICORE™ via 10kΩ pull-up to 5V domain. Use Value: Pin-compatible replacement for MAX809R44 with identical SC70 footprint and 4.38V threshold - simplifies qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809R44+T | Same 4.38V threshold, push-pull output, 2.5µA ICC (vs. 1µA), SC70-3 package | Requires no external pull-up; unsuitable for wired-OR or bidirectional reset buses | Select when lowest BOM count is prioritized and open-drain functionality is unnecessary |
| TPS3808G33DBVR | 4.38V threshold, open-drain output, 1.8µA ICC, SOT23-3 package, 200ms min timeout | Larger 2.92mm × 1.6mm SOT23 footprint; lacks guaranteed 1V VCC operation | Choose when higher drive strength (20mA sink) or TI ecosystem alignment outweighs SC70 size constraint |
Compared with MAX809R44+T and TPS3808G33DBVR, MAX6348XR44+T uniquely combines ultra-low 1µA current, SC70-3 footprint, open-drain flexibility, and guaranteed operation down to 1V - making it optimal for space-constrained, battery-sensitive designs requiring robust reset signaling.
Availability
MAX6348XR44+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter data loggers, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6348XR44+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, computing, and consumer applications.
The MAX63xx family delivers ultra-low-power, factory-trimmed µP supervisors targeting battery-powered and space-constrained embedded systems where reliability, small size, and minimal current draw are critical.
FAQ
What is the exact reset threshold voltage of MAX6348XR44+T and how tightly is it specified?
The MAX6348XR44+T has a factory-trimmed nominal reset threshold of 4.38V, specified as ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C operating temperature range. This corresponds to a minimum threshold of 4.270V and maximum of 4.489V under worst-case conditions - verified per Table 1 in the official datasheet.
Does MAX6348XR44+T support operation at VCC below 2.0V, and what is its minimum functional voltage?
Yes, MAX6348XR44+T is fully guaranteed to operate and assert valid reset down to VCC = 1.2V over temperature, with correct reset state maintained even at 1.0V (per Absolute Maximum Ratings). This enables reliable brownout detection in deeply undervolted systems where other supervisors fail.
What is the output configuration of MAX6348XR44+T, and what external components does it require?
MAX6348XR44+T features an active-low open-drain RESET output (Pin 2), requiring only a single external pull-up resistor to the desired logic rail (e.g., 3.3V or 5V). No capacitors, resistors for threshold setting, or trimming components are needed - enabling true 3-pin simplicity.
How does MAX6348XR44+T handle fast voltage transients on the VCC line?
MAX6348XR44+T's reset comparator is specifically designed to ignore fast negative-going VCC transients. Its immunity is quantified in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph: for a 4.38V threshold, transients less than ~120µs (at 100mV overdrive) will not trigger reset - suppressing noise from switching regulators or ESD events.
Is MAX6348XR44+T pin-compatible with other members of the MAX63xx family, and which packages are offered?
Yes, MAX6348XR44+T shares identical pinout and SC70-3 footprint with all MAX6326/MAX6327/MAX6328/MAX6346/MAX6347 variants. It is also available in SOT23-3 (MAX6348UR44+T), and both packages are pin-compatible with legacy MAX803/MAX809/MAX810 families - enabling drop-in upgrades in existing layouts.
MAX6348XR44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Open Drain or Open Collector
- 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
MAX6348XR44+T FAQ
1.How can I place an order for MAX6348XR44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6348XR44+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 MAX6348XR44+T reliable?
The price and inventory of MAX6348XR44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6348XR44+T is usually 5 days.
3.What payment methods are accepted for MAX6348XR44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6348XR44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6348XR44+T?
MAX6348XR44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6348XR44+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 MAX6348XR44+T?
For technical support, including MAX6348XR44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6348XR44+T requirements.
6.How does Aetrix verify that MAX6348XR44+T is sourced from the original manufacturer or authorized distributors?
All MAX6348XR44+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 MAX6348XR44+T meets industry standards.
7.What is the process for return or replacement of MAX6348XR44+T?
All MAX6348XR44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6348XR44+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 MAX6348XR44+T part is unused and in its original packaging.
Return procedure for MAX6348XR44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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