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Analog Devices Inc./Maxim Integrated MAX6348XR42-T
- Part No.:
- MAX6348XR42-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6348XR42-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,430
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Product details
Overview
MAX6348XR42-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor VCC supply voltage and assert reset during brownout, power-up, and power-down events. It features a factory-trimmed 4.20V reset threshold (±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-power reset assertion.
For engineers reviewing the MAX6348XR42-T datasheet, MAX6348XR42-T pinout, MAX6348XR42-T application, or MAX6348XR42-T equivalent, key selection criteria include its open-drain RESET output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), immunity to fast VCC transients, and SC70-3 package suitability for space-constrained embedded designs.
Technical Context
The MAX6348XR42-T implements a precision bandgap-based reset comparator with 40ppm/°C temperature coefficient and 9.5mV hysteresis to prevent chatter near threshold. Its internal timing circuit guarantees ≥100ms reset assertion after VCC rises above 4.20V, with delay stable across -40°C to +85°C.
As an open-drain device, it requires an external pull-up resistor on RESET to interface with µP reset inputs, enabling bidirectional reset control - either the MAX6348XR42-T or the µP can drive the shared reset line low. It ignores negative-going VCC transients ≤200µs at 200mV overdrive, per typical operating characteristics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.20V ±2.5% (–40°C to +85°C); ensures reliable detection of 4.2V supply collapse in Li-ion powered systems. |
| Supply Current | 1.0µA max at +25°C; enables multi-year battery life in always-on monitoring applications. |
| Reset Timeout | 100ms min power-up delay; meets JEDEC JESD84-B51 requirement for NAND flash initialization. |
| Output Type | Open-drain active-low RESET; supports wired-OR reset buses and bidirectional µP interfaces (e.g., 68HC11). |
| VCC Operating Range | 1.2V to 5.5V; functions during deep brownout and supports 1.8V/2.5V/3.3V/5V logic domains. |
| Reset Hysteresis | 9.5mV; prevents oscillation during slow VCC recovery near 4.20V threshold. |
| Transient Immunity | Rejects VCC glitches ≤200µs at 200mV underdrive; eliminates false resets in noisy power environments. |
Pinout & Package
MAX6348XR42-T is housed in a 3-pin SC70-3 package (outline 21-0075), measuring 2.0mm × 2.1mm × 0.9mm, with gull-wing leads compatible with standard reflow profiles and RoHS-compliant lead-free assembly (marked "+T" for lead-free; this part uses "-T" suffix indicating leaded finish).
| 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 | Open-drain active-low reset output; requires external pull-up (typically 10kΩ to VCC) to drive µP reset input. |
| 3 | VCC | Power supply input (1.2V–5.5V); also monitored by internal reset comparator; decoupling capacitor (0.1µF) required adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 1µA max enables >10-year operation on CR2032 coin cell in standby monitoring mode. |
| Factory-trimmed reset threshold | 4.20V ±2.5% eliminates need for external resistor divider or calibration in production. |
| Open-drain RESET output | Allows direct connection to bidirectional µP reset pins without level-shifting or isolation diodes. |
| 100ms minimum reset pulse width | Guarantees full initialization of complex peripherals (e.g., DDR memory, FPGA configuration) before release. |
| VCC transient immunity | Rejects sub-200µs supply noise spikes, reducing need for additional input filtering in EMI-prone environments. |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: A wireless environmental sensor node powered by a single Li-ion cell (3.0–4.2V range) enters deep sleep between readings and must reliably reset its MCU if voltage drops below safe operating level. IC Role / Device Role / Timing Role: Supervisory circuit monitoring VCC and asserting open-drain RESET to hold MCU in reset until battery recovers to ≥4.20V or charger restores voltage. Use Value: Prevents corrupted firmware execution during brownout, leveraging 1µA quiescent current to extend battery life beyond 5 years. |
Use Scenario: An industrial digital I/O module with isolated RS-485 and relay drivers experiences intermittent 12V rail sag due to motor switching, risking µC lockup. IC Role / Device Role / Timing Role: Reset supervisor tied to 3.3V logic rail derived from 12V; asserts RESET for ≥100ms after any dip below 4.20V on its VCC input. Use Value: Ensures deterministic recovery from power disturbances without manual intervention or watchdog timeout escalation. |
| Medical Wearable Monitor | Automotive Body Control Module (BCM) |
|
Use Scenario: A wearable ECG patch uses a low-noise analog front-end and BLE SoC; supply instability during RF transmission must not cause silent data corruption. IC Role / Device Role / Timing Role: Active-low open-drain reset generator providing clean, glitch-free reset signal synchronized to 4.20V battery threshold. Use Value: Guarantees full system reset before analog acquisition resumes, eliminating undetected state errors in clinical-grade measurements. |
Use Scenario: A BCM supplies 3.3V to CAN transceivers and microcontrollers; load dump transients on the 12V input cause brief dips on downstream regulators. IC Role / Device Role / Timing Role: VCC monitor on regulated 3.3V rail, asserting RESET for ≥100ms after any drop below 4.20V - detecting regulator failure, not raw 12V disturbance. Use Value: Enables fail-safe shutdown and controlled restart of safety-critical subsystems without relying on software watchdog alone. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328UR42-T | SOT23-3 package (vs. SC70-3); identical electrical specs, same 4.20V threshold and open-drain output. | Same functional role but larger footprint (2.9mm × 1.6mm vs. 2.0mm × 2.1mm); better thermal dissipation in high ambient. | Select MAX6328UR42-T when board layout requires SOT23 land pattern or higher power handling margin is needed. |
| TPS3808G33DBVR | Push-pull active-low output (not open-drain); 3.3V fixed threshold; 1.6µA max ICC; same SC70-3 package. | Lacks bidirectional reset capability; requires no pull-up but cannot share reset bus with other open-drain sources. | Choose TPS3808G33DBVR only if system uses dedicated reset line and 3.3V threshold suffices - not a drop-in replacement for MAX6348XR42-T. |
Compared with MAX6328UR42-T, MAX6348XR42-T offers identical functionality in a smaller SC70-3 footprint ideal for ultra-compact designs; compared with TPS3808G33DBVR, it provides open-drain flexibility for shared reset buses but requires external pull-up and targets 4.2V systems rather than 3.3V.
Availability
MAX6348XR42-T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, medical wearables, industrial PLC modules, and automotive body control units requiring stable component supply with guaranteed long-term continuity.
Supply support for MAX6348XR42-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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX63xx family delivers ultra-low-power, factory-trimmed reset supervision for microprocessor-based systems where reliability, small size, and minimal quiescent current are critical design requirements.
FAQ
What is the exact reset threshold voltage of MAX6348XR42-T and how stable is it over temperature?
The MAX6348XR42-T has a nominal reset threshold of 4.20V at +25°C, with tolerance of ±1.5% at room temperature and ±2.5% across the full –40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning drift is limited to approximately ±10.5mV over the entire temperature span - sufficient for stable operation in battery-powered and industrial environments.
Does MAX6348XR42-T require an external pull-up resistor on the RESET pin?
Yes, MAX6348XR42-T features an open-drain RESET output and requires an external pull-up resistor (typically 4.7kΩ to 10kΩ) connected between the RESET pin and the target µP's VCC or reset-rail voltage. This enables wired-OR functionality and bidirectional reset control, as confirmed in the Applications Information section for interfacing with Motorola 68HC11 µPs.
Can MAX6348XR42-T operate with VCC below 2.5V, and what is its minimum functional supply voltage?
Yes, MAX6348XR42-T is fully specified down to VCC = 1.2V over temperature, and the reset comparator remains valid for VCC as low as 1.0V (absolute minimum rating). At 1.2V, it maintains correct reset assertion state and delivers RESET output voltage ≤0.4V with 100µA sink current - enabling use in ultra-low-voltage systems such as energy-harvesting nodes.
How does MAX6348XR42-T handle short power supply transients, and what is its immunity specification?
MAX6348XR42-T is designed to ignore fast negative-going VCC transients: the Typical Operating Characteristics graph shows it rejects pulses ≤200µs wide when the overdrive (VTH – VCC) is 200mV. This immunity prevents false resets caused by switching noise or load-dump coupling, making it suitable for electrically harsh environments like motor controls or automotive subsystems.
Is MAX6348XR42-T pin-compatible with older Maxim reset supervisors like MAX809?
Yes, MAX6348XR42-T is explicitly stated as pin-compatible with MAX803/MAX809/MAX810 in the datasheet Selector Guide. All share the same 3-pin SC70/SOT23 pinout (VCC, RESET, GND), allowing direct PCB-level replacement - provided the application requires open-drain active-low reset and a 4.20V threshold, as MAX809 variants offer different thresholds and output types.
MAX6348XR42-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:
- 4.2V
- 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
MAX6348XR42-T FAQ
1.How can I place an order for MAX6348XR42-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6348XR42-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 MAX6348XR42-T reliable?
The price and inventory of MAX6348XR42-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6348XR42-T is usually 5 days.
3.What payment methods are accepted for MAX6348XR42-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6348XR42-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6348XR42-T?
MAX6348XR42-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6348XR42-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 MAX6348XR42-T?
For technical support, including MAX6348XR42-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6348XR42-T requirements.
6.How does Aetrix verify that MAX6348XR42-T is sourced from the original manufacturer or authorized distributors?
All MAX6348XR42-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 MAX6348XR42-T meets industry standards.
7.What is the process for return or replacement of MAX6348XR42-T?
All MAX6348XR42-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6348XR42-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 MAX6348XR42-T part is unused and in its original packaging.
Return procedure for MAX6348XR42-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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