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Analog Devices Inc./Maxim Integrated MAX6348UR40+
- Part No.:
- MAX6348UR40+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6348UR40+.pdf
- Description:
- MAX6348 3-PIN, ULTRA-LOW-POWER S
- Quantity:
- Payment:
- Shipping:
Inventory:4,241
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Product details
Overview
MAX6348UR40+ from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 4.0V power supplies in embedded digital systems. It asserts reset when VCC falls below 4.0V (±1.5% at +25°C, ±2.5% over -40°C to +85°C), maintains reset for ≥100ms after VCC recovers, and draws ≤1µA supply current. Used in portable battery-powered controllers requiring reliable brownout detection and bidirectional reset pin interfacing.
For engineers reviewing the MAX6348UR40+ datasheet, MAX6348UR40+ pinout, MAX6348UR40+ application, or MAX6348UR40+ equivalent, this page delivers verified functional identity, confirmed SOT23-3 package mapping, validated open-drain reset behavior, factory-trimmed 4.0V threshold specification, and direct alternative part comparisons with documented electrical and interface differences.
Technical Context
The MAX6348UR40+ implements a precision bandgap-based voltage comparator with hysteresis (9.5mV typical) to reject fast VCC transients while ensuring clean reset assertion during brownout. Its reset timeout is guaranteed minimum 100ms after VCC exceeds the threshold, with full temperature specification from -40°C to +85°C.
As an open-drain output device, MAX6348UR40+ requires an external pull-up resistor and supports bidirectional reset control-enabling direct interface with µPs like the Motorola 68HC11 that share reset pins. It operates down to 1V VCC and exhibits 40ppm/°C reset threshold tempco.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.0V ±1.5% (25°C), ±2.5% (-40°C to +85°C); factory-trimmed for precise 4.0V supply monitoring |
| Reset Output Type | Active-low open-drain; requires external pull-up; enables bidirectional reset pin sharing |
| Reset Timeout | ≥100ms after VCC rises above threshold; ensures stable µP initialization post-brownout |
| Supply Current | ≤1µA max; enables multi-year operation in coin-cell–powered portable instruments |
| VCC Operating Range | 1.0V to 5.5V; guarantees correct reset state even during deep undervoltage conditions |
| Reset Hysteresis | 9.5mV typical; prevents oscillation near threshold during slow VCC recovery |
| Tempco | 40ppm/°C; limits threshold drift across industrial temperature range |
Pinout & Package
MAX6348UR40+ is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height-compatible with high-density PCB layouts and reflow assembly.
| 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 reset output; sinks current when asserted; requires external pull-up resistor |
| 3 | VCC | Power supply input; monitored voltage source; operates from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | ≤1µA max enables >10-year battery life in always-on portable instrumentation |
| Factory-trimmed reset threshold | 4.0V ±1.5% at +25°C eliminates calibration components and board-level trimming |
| Open-drain output architecture | Supports wired-OR reset bus and bidirectional µP reset pin sharing without level-shifting |
| Transient immunity | Rejects negative VCC glitches up to 200µs (at 100mV overdrive), preventing false resets |
| Full temperature specification | Guaranteed performance from -40°C to +85°C meets industrial and automotive ambient requirements |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered ECG and pulse oximeter units operating on single Li-ion or coin cells with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervises 4.0V system rail and asserts reset during battery sag or cold-start undervoltage. Use Value: Ensures deterministic µC boot sequence after brownout, leveraging ≤1µA quiescent current to extend operational runtime between charges. |
Use Scenario: DIN-rail mounted remote I/O modules exposed to wide ambient temperature swings and noisy 24VDC field power. IC Role / Device Role / Timing Role: Monitors regulated 4.0V logic supply derived from industrial 24VDC; provides ≥100ms reset hold time after line recovery. Use Value: Prevents firmware corruption during transient dips by guaranteeing reset remains asserted until stable power is restored-critical for fail-safe control execution. |
| Automotive Body Control Units | Smart Sensor Transmitters |
|
Use Scenario: Low-power door module ECUs powered from vehicle battery (9V–16V) with local 4.0V LDO regulation. IC Role / Device Role / Timing Role: Detects LDO output collapse due to load dump or cold-crank events; drives open-drain reset line shared with MCU and CAN transceiver. Use Value: Enables synchronized reset of multiple peripherals via single wired-OR bus-reducing component count and PCB area versus discrete reset solutions. |
Use Scenario: 4–20mA loop-powered pressure/temperature transmitters with integrated ADC and low-power MCU. IC Role / Device Role / Timing Role: Supervises 4.0V analog front-end and digital core supply; asserts reset during loop power interruption or brownout. Use Value: Maintains sensor accuracy and communication integrity by enforcing clean restart after power anomaly-verified across -40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR40+T | Push-pull active-low reset; no external pull-up required; 1.5µA max ICC; same 4.0V threshold tolerance | Not suitable for bidirectional reset buses; incompatible with µPs requiring open-drain reset arbitration | Select MAX809TR40+T only when board layout lacks space for pull-up resistor or shared reset bus is unused |
| TPS3808G33DBVR | Adjustable threshold (via external resistor divider); 2.5µA ICC; push-pull output; 200ms min reset timeout | Requires external components; lacks factory-trimmed precision; not pin-compatible | Choose TPS3808G33DBVR only when design requires programmable threshold or higher timeout margin beyond 100ms |
Compared with MAX6348UR40+, MAX809TR40+T simplifies BOM by eliminating the pull-up resistor but forfeits bidirectional reset capability, while TPS3808G33DBVR offers flexibility at the cost of added components, reduced accuracy, and non-drop-in replacement effort.
Availability
MAX6348UR40+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, automotive body control units, and smart sensor transmitters requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX6348UR40+ 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, automotive, communications, and computing markets.
The MAX63xx family delivers ultra-low-power, factory-trimmed reset supervisors targeting battery-operated and thermally demanding embedded systems where reliability and minimal footprint are critical.
FAQ
What is the exact reset threshold voltage for MAX6348UR40+ and how tightly is it specified?
The MAX6348UR40+ has a factory-trimmed reset threshold of 4.0V, specified as ±1.5% at +25°C and ±2.5% over the full -40°C to +85°C operating temperature range. This precision eliminates need for external calibration and ensures consistent brownout detection across environmental conditions. The 4.0V value corresponds directly to the "R40" suffix in the MAX6348UR40+ part number.
Does MAX6348UR40+ require an external pull-up resistor, and why?
Yes, MAX6348UR40+ requires an external pull-up resistor on its RESET pin because it features an open-drain output configuration. This design enables wired-OR reset bus implementation and bidirectional reset control-essential for interfacing with microprocessors like the Motorola 68HC11 that share reset pins. Without the pull-up, the RESET signal cannot drive high, rendering the device nonfunctional in most system contexts.
What is the minimum VCC voltage at which MAX6348UR40+ guarantees correct reset state assertion?
MAX6348UR40+ guarantees correct reset state (i.e., RESET asserted when VCC is below threshold, deasserted when above) down to VCC = 1.0V. This feature ensures reliable operation during deep brownout or ultra-low-power sleep modes, where supply voltage may dip significantly before full shutdown-critical for fail-safe behavior in safety-critical embedded systems.
How does MAX6348UR40+ handle fast VCC transients, and what is its immunity specification?
MAX6348UR40+ rejects fast negative-going VCC transients via internal comparator hysteresis (9.5mV typical) and transient filtering. Its datasheet specifies maximum allowable glitch duration versus overdrive voltage-for example, a 100mV VCC dip can be up to ~140µs without triggering reset. This immunity prevents spurious resets caused by switching noise or coupling, enhancing system robustness in electrically noisy environments.
Is MAX6348UR40+ pin-compatible with other members of the MAX63xx family, and which ones?
Yes, MAX6348UR40+ is pin-compatible with all members of the MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 family-including MAX6326UR40+, MAX6346UR40+, and MAX6328UR40+-as they all use identical SOT23-3 and SC70-3 packages with identical pin 1 (GND), pin 2 (RESET), and pin 3 (VCC) assignments. Functionality differs only in reset polarity and output type (open-drain vs. push-pull), not physical layout.
MAX6348UR40+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Power Supply Monitor
- 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:
- SOT-23-3
MAX6348UR40+ FAQ
1.How can I place an order for MAX6348UR40+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6348UR40+ 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 MAX6348UR40+ reliable?
The price and inventory of MAX6348UR40+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6348UR40+ is usually 5 days.
3.What payment methods are accepted for MAX6348UR40+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6348UR40+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6348UR40+?
MAX6348UR40+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6348UR40+ 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 MAX6348UR40+?
For technical support, including MAX6348UR40+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6348UR40+ requirements.
6.How does Aetrix verify that MAX6348UR40+ is sourced from the original manufacturer or authorized distributors?
All MAX6348UR40+ 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 MAX6348UR40+ meets industry standards.
7.What is the process for return or replacement of MAX6348UR40+?
All MAX6348UR40+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6348UR40+, 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 MAX6348UR40+ part is unused and in its original packaging.
Return procedure for MAX6348UR40+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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