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Analog Devices Inc./Maxim Integrated MAX6338NUB+
- Part No.:
- MAX6338NUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6338NUB+.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,494
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Product details
Overview
The MAX6338NUB+ from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V, +3.0V, adjustable, and -5.0V supplies with ±5% tolerance, consuming 25µA typical supply current, operating from +2.5V to +5.5V VCC, and delivering four independent open-drain active-low outputs in a 10-pin µMAX package - used in telecom power sequencing and industrial embedded control.
For engineers reviewing the MAX6338NUB+ datasheet, MAX6338NUB+ pinout, MAX6338NUB+ application, or MAX6338NUB+ equivalent, this page delivers verified threshold voltages (+5.0V at 4.75V, +3.0V at 2.85V, -5.0V at -4.75V), factory-trimmed accuracy (±1.5% over -40°C to +85°C), internal 1.23V bandgap reference, hysteresis (0.3%), and wire-OR output capability without external components.
Technical Context
The MAX6338NUB+ integrates four comparators sharing a precision 1.23V bandgap reference, with IN1 and IN2 configured for fixed +5.0V and +3.0V thresholds, IN3 as an adjustable input (via resistor divider), and IN4 for -5.0V detection using inverted polarity sensing. Each comparator drives an open-drain output with weak 10µA internal pull-up to VCC.
Its undervoltage lockout (UVLO) circuit disables all outputs when VCC drops below +2.5V, ensuring reliable reset behavior during brownout. Threshold hysteresis is internally implemented at 0.3%, eliminating need for external feedback resistors - unlike discrete comparator solutions requiring external hysteresis networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| +5.0V Threshold | 4.75V (−5% nominal); ensures reliable detection of +5V rail collapse before downstream logic fails |
| +3.0V Threshold | 2.85V (−5% nominal); matches standard 3.0V LDO tolerance for clean power-good assertion |
| −5.0V Threshold | −4.75V (+5% nominal); supports legacy analog subsystems requiring negative rail supervision |
| Adjustable Threshold | 1.23V internal reference; enables custom trip points via external resistor divider (e.g., 4.5V with R1=265kΩ, R2=100kΩ) |
| Supply Current | 25µA typical at +5V; allows integration into always-on supervisory paths without impacting system quiescent power |
| Operating Temp | −40°C to +85°C; guaranteed performance across industrial temperature range without derating |
| Propagation Delay | 20µs max; provides deterministic response time for fast power-fail detection and controlled shutdown |
Pinout & Package
The MAX6338NUB+ is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height, 0.5mm pitch), thermally enhanced with exposed pad (not electrically connected), compatible with standard surface-mount reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN1 | +5.0V monitored input | Fixed-threshold comparator input; asserts OUT1 low when voltage falls below 4.75V |
| 2 IN2 | +3.0V monitored input | Fixed-threshold comparator input; asserts OUT2 low when voltage falls below 2.85V |
| 3 IN3 | Adjustable voltage input | High-Z input referenced to internal 1.23V; supports user-defined trip point via external resistor divider |
| 4 IN4 | −5.0V monitored input | Inverted-polarity input; asserts OUT4 low when voltage rises above −4.75V (i.e., negative rail loss) |
| 5 GND | Analog/digital ground | Common reference for all comparators and UVLO circuitry; must be low-impedance connection |
| 6 OUT4 | Active-low open-drain output | Drives low on IN4 fault; requires external pull-up for logic-high state; supports wire-OR with other outputs |
| 7 OUT3 | Active-low open-drain output | Drives low on IN3 fault; shares same electrical characteristics as OUT4; enables aggregated "power good" signal |
| 8 OUT2 | Active-low open-drain output | Drives low on IN2 fault; weak 10µA internal pull-up to VCC allows direct interfacing with 3.3V/5V logic |
| 9 OUT1 | Active-low open-drain output | Drives low on IN1 fault; compatible with microcontroller reset inputs requiring active-low assertion |
| 10 VCC | Power supply input | +2.5V to +5.5V supply; UVLO forces all outputs low if VCC < 2.5V; bypass capacitor required (0.1µF) |
Key Features
| Feature | Design Value |
|---|---|
| Quad fixed + adjustable monitoring | Simultaneously supervises +5V, +3V, −5V, and one user-defined rail - eliminates need for multiple discrete supervisors |
| Factory-trimmed thresholds | ±1.5% accuracy over full temperature range; removes calibration burden in production test |
| Internal hysteresis | 0.3% built-in; prevents chatter near trip points without external resistors or layout complexity |
| Wire-OR output architecture | All four open-drain outputs can share a single pull-up resistor to generate composite "all-rails-good" signal |
| Low-power operation | 25µA typical ICC enables use in battery-backed or energy-sensitive applications without compromising supervision integrity |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring multiple DC rails (+5V, +3V, −5V, and auxiliary 12V) in a line card with strict power-up/down ordering requirements. IC Role / Device Role / Timing Role: Quad voltage supervisor providing independent fault flags and aggregated power-good signal to FPGA-based sequencer. Use Value: Ensures safe power sequencing by asserting individual rail faults before enabling downstream loads, preventing latch-up or bus contention. | Use Scenario: Supervising isolated analog front-end supplies (+5V, +3.3V, −5V, and sensor bias) in a programmable logic controller's I/O module. IC Role / Device Role / Timing Role: Fault-detection node feeding watchdog timer and diagnostic register in real-time control firmware. Use Value: Enables immediate shutdown of analog signal chain upon any rail deviation, preserving measurement integrity and preventing corrupted data acquisition. |
| Desktop Motherboard VRM Monitoring | Medical Imaging Power Subsystem |
Use Scenario: Verifying core logic (+5V), memory interface (+3.0V), auxiliary bias (adjustable), and legacy analog (-5V) rails on a high-reliability desktop motherboard. IC Role / Device Role / Timing Role: Primary power-good generator interfaced directly to southbridge reset logic and BIOS POST routine. Use Value: Reduces BOM count by replacing four discrete supervisors while maintaining per-rail visibility via individual outputs. | Use Scenario: Supervising critical imaging subsystem rails (+5V digital, +3.0V ADC reference, −5V op-amp bias, and adjustable detector bias) in MRI front-end electronics. IC Role / Device Role / Timing Role: Safety-critical monitoring element feeding fail-safe interlock circuit and diagnostic log buffer. Use Value: Guarantees sub-20µs fault response to prevent image artifacts or hardware damage during transient rail collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328EUB+ | Triple monitor (+5V, +3.3V, +2.5V); no −5V support; 10% tolerance only on +2.5V rail | Lacks negative rail monitoring and adjustable input; suitable only for positive-only systems | Select when −5V supervision is unnecessary and tighter +2.5V tolerance is acceptable |
| TPS3307-33DGNR | Triple supervisor (+3.3V, +5V, adjustable); no −5V channel; higher ICC (45µA typ); different pinout | Requires external hysteresis resistors; not drop-in; lacks integrated negative rail detection | Choose for TI-based designs where ecosystem compatibility outweighs feature parity |
Compared with MAX6338NUB+, MAX6328EUB+ omits −5V and adjustable monitoring but offers lower cost for simpler three-rail systems, while TPS3307-33DGNR trades integration for vendor alignment and requires additional passives - making MAX6338NUB+ optimal for mixed-polarity, field-programmable supervision.
Availability
MAX6338NUB+ is available at Aetrix Electronics and suitable for telecommunications infrastructure, industrial PLCs, medical imaging subsystems, and high-reliability computing platforms requiring stable component supply and long-term lifecycle assurance.
Supply support for MAX6338NUB+ 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 computing markets.
The MAX6338NUB+ belongs to Maxim's precision voltage supervisor product line, engineered specifically for multirail power integrity in space-constrained, thermally demanding embedded systems.
FAQ
What is the exact threshold voltage for the −5.0V input on MAX6338NUB+?
The MAX6338NUB+ features a +5% tolerance setting for the −5.0V input, resulting in a trip threshold of −4.75V (i.e., OUT4 goes low when the −5V rail rises above −4.75V). This polarity inversion is inherent to negative-supply monitoring and is confirmed in the Electrical Characteristics table under "−5.0V (+5%) Threshold" with VTH = −4.75V (typ).
Can MAX6338NUB+ monitor a +12V rail?
Yes - the MAX6338NUB+ IN3 input is user-adjustable using an external resistor divider referenced to the internal 1.23V bandgap. For +12V monitoring, set R1 = R2 × ((12V / 1.23V) − 1); with R2 = 100kΩ, R1 ≈ 872kΩ. The MAX6338NUB+ datasheet Figure 6 explicitly validates this configuration for arbitrary positive voltages.
Does MAX6338NUB+ require external pull-up resistors on its outputs?
Yes - although MAX6338NUB+ includes weak 10µA internal pull-ups to VCC, external pull-up resistors are required for proper logic-level translation when interfacing with devices operating at different supply voltages (e.g., 3.3V MCU with 5V VCC). The internal pull-ups alone cannot drive sufficient current for robust noise immunity or fan-out.
What happens to MAX6338NUB+ outputs during VCC brownout?
The MAX6338NUB+ incorporates an internal undervoltage lockout (UVLO) that forces all four outputs low whenever VCC drops below +2.5V. This behavior is guaranteed across −40°C to +85°C and ensures predictable reset assertion even during partial power loss - a key requirement validated in the Absolute Maximum Ratings and Pin Description sections.
Is MAX6338NUB+ pin-compatible with other MAX6338 variants like MAX6338JUB+?
No - while all MAX6338 variants share the same 10-pin µMAX package and pinout, MAX6338NUB+ is functionally distinct due to its specific factory-programmed thresholds (+5.0V, +3.0V, adjustable, −5.0V at 5% tolerance). Swapping with MAX6338JUB+ (which monitors +5.0V, +3.3V, +2.5V†, +1.8V†) would result in incorrect trip points and potential system malfunction.
MAX6338NUB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 2.78V, 4.63V, Adj, -4.63V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- <1ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX6338NUB+ FAQ
1.How can I place an order for MAX6338NUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6338NUB+ 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 MAX6338NUB+ reliable?
The price and inventory of MAX6338NUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6338NUB+ is usually 5 days.
3.What payment methods are accepted for MAX6338NUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6338NUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6338NUB+?
MAX6338NUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6338NUB+ 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 MAX6338NUB+?
For technical support, including MAX6338NUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6338NUB+ requirements.
6.How does Aetrix verify that MAX6338NUB+ is sourced from the original manufacturer or authorized distributors?
All MAX6338NUB+ 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 MAX6338NUB+ meets industry standards.
7.What is the process for return or replacement of MAX6338NUB+?
All MAX6338NUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6338NUB+, 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 MAX6338NUB+ part is unused and in its original packaging.
Return procedure for MAX6338NUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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