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Analog Devices Inc./Maxim Integrated MAX6348XR40-T
- Part No.:
- MAX6348XR40-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6348XR40-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,620
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Product details
Overview
MAX6348XR40-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 4.0V power supplies in embedded systems. It asserts reset when VCC falls below 4.00V (±2.5% over temperature), holds reset for ≥100ms after recovery, draws ≤1µA supply current at 3V, operates from 1.2V to 5.5V, and is packaged in a 3-pin SC70-3 for space-constrained µP reset applications in portable equipment.
For engineers reviewing the MAX6348XR40-T datasheet, MAX6348XR40-T pinout, MAX6348XR40-T application, or MAX6348XR40-T equivalent, this page delivers verified reset threshold accuracy, open-drain output behavior, ultra-low quiescent current, transient immunity specs, and direct compatibility with bidirectional µP reset pins-critical for brownout protection and power sequencing validation.
Technical Context
The MAX6348XR40-T implements a precision bandgap-based voltage comparator with factory-trimmed 4.00V reset threshold (±1.5% at +25°C, ±2.5% over −40°C to +85°C) and 9.5mV hysteresis. Its open-drain RESET output requires an external pull-up and supports bidirectional reset assertion with microcontrollers like the Motorola 68HC11.
It features transient immunity up to 100V/µs on VCC, guarantees correct state down to 1.2V VCC, and ignores fast negative-going transients-enabling robust operation during power-up, power-down, and brownout events without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V ±2.5% over −40°C to +85°C - ensures reliable brownout detection for 4.0V nominal rails |
| Supply Current | ≤1.0µA at 3V - enables multi-year battery life in portable monitoring systems |
| Reset Timeout | 100ms minimum power-on reset pulse - meets µP initialization timing requirements |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and bidirectional reset control |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and across multiple supply domains |
| Transient Immunity | 100V/µs dV/dt on VCC - suppresses false resets from switching noise or ESD-induced glitches |
| Reset Hysteresis | 9.5mV - prevents oscillation near threshold during slow VCC recovery |
Pinout & Package
MAX6348XR40-T is housed in a 3-pin SC70-3 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.9mm, with gull-wing leads and RoHS-compliant lead-free finish (ordered as "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection |
| 2 | RESET | Open-drain active-low output; requires external pull-up resistor to host VCC or logic rail |
| 3 | VCC | Supply input; powers internal circuitry and defines monitored rail; accepts 1.2V–5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.00V threshold | Eliminates manual calibration and external resistive dividers for precise 4.0V system monitoring |
| Ultra-low 1µA supply current | Reduces standby power in always-on battery-powered devices without compromising reset integrity |
| Open-drain RESET output | Enables shared reset bus with multiple supervisors or µPs, supporting bidirectional assertion (e.g., 68HC11) |
| 100ms minimum reset timeout | Guarantees sufficient hold time for full µP core and peripheral initialization before release |
| −40°C to +85°C guaranteed operation | Validated performance across industrial temperature range without derating or external compensation |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring fail-safe power monitoring during intermittent operation. IC Role / Device Role / Timing Role: Supervises 4.0V lithium coin-cell or regulated rail; asserts reset on voltage sag to prevent corrupted sensor readings or flash writes. Use Value: 1µA quiescent current extends battery life beyond 5 years; 4.00V threshold matches typical LDO output for medical-grade regulation. |
Use Scenario: DIN-rail mounted I/O modules exposed to wide ambient temperatures and noisy 24VDC field supplies. IC Role / Device Role / Timing Role: Monitors local 4.0V logic supply derived from industrial DC-DC converter; provides clean, glitch-immune reset during line transients. Use Value: 100V/µs transient immunity prevents spurious resets from relay switching or motor drive noise; SC70 package fits dense PCB layouts. |
| Smart Energy Meters | Automotive Body Control Units |
Use Scenario: ANSI C12.20-compliant electricity meters with dual-supply architecture (3.3V MCU + 4.0V RTC/backup rail). IC Role / Device Role / Timing Role: Dedicated supervisor for 4.0V backup rail powering real-time clock and nonvolatile memory during main power loss. Use Value: Guaranteed operation down to 1.2V VCC ensures reset remains asserted even during deep brownout; open-drain output interfaces cleanly with isolated reset domain. |
Use Scenario: Low-power door module controllers powered from vehicle battery via 4.0V LDO, subject to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Resets MCU on battery undervoltage (e.g., <4.0V during cranking); hysteresis prevents chatter during recovery. Use Value: 9.5mV hysteresis and ±2.5% threshold tolerance ensure deterministic reset release; SC70 footprint minimizes board area in constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328XR40-T | Same 4.00V threshold, identical SC70-3 package, but rated only for 0°C to +70°C industrial range (vs. −40°C to +85°C) | Limited to commercial-temperature applications; not qualified for extended industrial or automotive environments | Select MAX6328XR40-T only if operating temperature stays above −40°C and cost sensitivity outweighs thermal margin |
| TPS3808G33DBVR | 3.3V fixed threshold, push-pull output, 1.6µA supply current, SOT23-3 package | Not suitable for 4.0V monitoring; requires PCB redesign due to push-pull output and different pinout | Choose only if system uses 3.3V supply and design can accommodate non-open-drain reset signaling |
Compared with MAX6348XR40-T, MAX6328XR40-T sacrifices extended temperature qualification for lower cost, while TPS3808G33DBVR offers higher supply current and incompatible output topology-making MAX6348XR40-T the sole option for open-drain, 4.0V, −40°C to +85°C reset supervision in SC70-3.
Availability
MAX6348XR40-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart energy meters requiring stable component supply, long-lifecycle availability, and guaranteed industrial-temperature performance.
Supply support for MAX6348XR40-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 industrial, computing, and communications applications.
The MAX63xx family delivers ultra-low-power, factory-trimmed µP supervisors targeting battery-powered and thermally demanding embedded systems where reliability, small size, and minimal external components are critical.
FAQ
What is the exact reset threshold voltage of MAX6348XR40-T and its tolerance over temperature?
The MAX6348XR40-T has a nominal reset threshold of 4.00V, with ±1.5% tolerance at +25°C and ±2.5% over the full −40°C to +85°C operating range. This specification is factory-trimmed and guaranteed per the Electrical Characteristics table in the official datasheet, ensuring accurate 4.0V supply monitoring without external calibration.
Does MAX6348XR40-T support bidirectional reset assertion with microcontrollers like the 68HC11?
Yes, MAX6348XR40-T supports bidirectional reset assertion because its RESET pin is open-drain. When used with a single external pull-up resistor, both the MAX6348XR40-T and the µP (e.g., Motorola 68HC11) can drive the shared reset line low-enabling coordinated system-level reset initiation from either device without contention.
What is the maximum supply voltage the MAX6348XR40-T can withstand on its VCC pin?
The MAX6348XR40-T supports a VCC supply range of 1.2V to 5.5V under normal operation. Its absolute maximum rating for VCC is +6V, but sustained operation above 5.5V may cause permanent damage. The device remains functional and correctly asserts reset down to 1.2V VCC, making it suitable for deep brownout detection.
How does the open-drain output of MAX6348XR40-T differ from push-pull alternatives like MAX6347XR40-T?
The MAX6348XR40-T's open-drain RESET output requires an external pull-up resistor and allows multiple devices to share a common reset bus (wired-OR). In contrast, MAX6347XR40-T uses a push-pull output that actively drives high and low-preventing bus sharing and requiring dedicated routing. This makes MAX6348XR40-T ideal for systems with multiple supervisors or bidirectional reset control.
Is MAX6348XR40-T compatible with the same PCB footprint as MAX809 or MAX810?
No, MAX6348XR40-T is not pin-compatible with MAX809/MAX810. While all are 3-pin reset supervisors, MAX6348XR40-T uses SC70-3 (X3-2) or SOT23-3 (U3-1) packages with distinct land patterns. MAX809/MAX810 use SOT23-3 but with different pin assignments (e.g., RESET on pin 1 vs. pin 2), requiring PCB layout revision for substitution.
MAX6348XR40-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:
- 4V
- 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
MAX6348XR40-T FAQ
1.How can I place an order for MAX6348XR40-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6348XR40-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 MAX6348XR40-T reliable?
The price and inventory of MAX6348XR40-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6348XR40-T is usually 5 days.
3.What payment methods are accepted for MAX6348XR40-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6348XR40-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6348XR40-T?
MAX6348XR40-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6348XR40-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 MAX6348XR40-T?
For technical support, including MAX6348XR40-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6348XR40-T requirements.
6.How does Aetrix verify that MAX6348XR40-T is sourced from the original manufacturer or authorized distributors?
All MAX6348XR40-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 MAX6348XR40-T meets industry standards.
7.What is the process for return or replacement of MAX6348XR40-T?
All MAX6348XR40-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6348XR40-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 MAX6348XR40-T part is unused and in its original packaging.
Return procedure for MAX6348XR40-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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