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Analog Devices Inc./Maxim Integrated MAX6338BUB
- Part No.:
- MAX6338BUB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6338BUB.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,020
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Product details
Overview
The MAX6338BUB from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V (−5% threshold), +3.3V (−5% threshold), +2.5V (−10% threshold), and an adjustable input with 1.23V internal reference. It delivers 25µA typical supply current, operates from +2.5V to +5.5V, and guarantees performance across −40°C to +85°C. Used in desktop computers and telecom equipment for reliable power-good signaling.
For engineers reviewing the MAX6338BUB datasheet, MAX6338BUB pinout, MAX6338BUB application, or MAX6338BUB equivalent, key selection criteria include factory-programmed thresholds per input, open-drain active-low outputs with internal 10µA pull-ups, undervoltage lockout below 2.5V, µMAX package footprint, and compatibility with wire-ORed "power good" logic.
Technical Context
The MAX6338BUB integrates four independent comparators, each with a dedicated input and open-drain output. Inputs IN1–IN3 are factory-set to +5.0V, +3.3V, and +2.5V nominal voltages with −5%, −5%, and −10% trip thresholds respectively; IN4 is adjustable via external resistor divider referenced to the 1.23V bandgap.
An internal undervoltage lockout forces all outputs low when VCC drops below 2.5V. The device uses BiCMOS process technology, achieves 60ppm/°C threshold temperature coefficient, and incorporates built-in 0.3% hysteresis-eliminating need for external feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - supports direct connection to monitored rails including +3.3V and +5V systems |
| Supply Current (typ) | 25µA at +5V - enables always-on supervision in battery-backed or low-power embedded systems |
| Threshold Accuracy | ±1.5% over temperature - ensures reliable trip points without calibration across industrial range |
| Output Type | Four open-drain, active-low outputs with 10µA internal pull-ups - allows wire-ORing into single system reset or power-good signal |
| Operating Temperature | −40°C to +85°C - qualified for industrial and computing environments without derating |
| Propagation Delay | 20µs max - provides fast response to supply faults while avoiding noise-induced false triggers |
| Threshold Hysteresis | 0.3% - suppresses chatter near trip points without external components |
Pinout & Package
The MAX6338BUB is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height), compatible with standard surface-mount assembly processes and offering compact board space utilization.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1) | +5.0V monitor input | Factory-trimmed to trip at 4.63V (−5%) - supervises main system 5V rail |
| 2 (IN2) | +3.3V monitor input | Factory-trimmed to trip at 3.08V (−5%) - monitors core logic or I/O supply |
| 3 (IN3) | +2.5V monitor input | Factory-trimmed to trip at 2.19V (−10%) - supports tighter tolerance requirements on analog or memory rails |
| 4 (IN4) | Adjustable monitor input | Connected to internal 1.23V reference - sets custom threshold using external resistor divider |
| 5 (GND) | Analog/digital ground | Common return for all inputs, outputs, and internal reference - requires low-impedance PCB connection |
| 6 (OUT4) | Active-low output for IN4 | Open-drain output with 10µA internal pull-up - sinks current when IN4 falls below threshold |
| 7 (OUT3) | Active-low output for IN3 | Open-drain output with 10µA internal pull-up - asserts fault signal independently per rail |
| 8 (OUT2) | Active-low output for IN2 | Open-drain output with 10µA internal pull-up - enables discrete fault reporting or OR-ing |
| 9 (OUT1) | Active-low output for IN1 | Open-drain output with 10µA internal pull-up - used for primary system reset generation |
| 10 (VCC) | Power supply input | +2.5V to +5.5V supply - powers internal circuitry and sources internal pull-ups; UVLO activates below 2.5V |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent monitoring | Four separate inputs and outputs enable simultaneous supervision of multiple supply domains without shared timing or masking |
| No external components required | Factory-trimmed thresholds and integrated 1.23V reference eliminate resistors, capacitors, or trimming potentiometers |
| Wire-ORable open-drain outputs | Internal 10µA pull-ups allow direct connection to common reset line - no external pull-up needed for basic operation |
| Built-in hysteresis | 0.3% hysteresis prevents oscillation during slow-moving or noisy supply transitions - no external feedback network required |
| Undervoltage lockout (UVLO) | Forces all outputs low when VCC < 2.5V - ensures valid operation only within specified supply range |
Applications
| Desktop Computer Power Supervision | Telecom Line Card Monitoring |
|---|---|
Use Scenario: Simultaneous monitoring of +5V, +3.3V, +2.5V, and auxiliary voltage on ATX motherboard or server backplane. IC Role / Device Role / Timing Role: Quad voltage supervisor generating independent fault flags and consolidated power-good signal. Use Value: Eliminates need for four discrete supervisors or complex FPGA-based monitoring - reduces BOM count and layout area by >60%. | Use Scenario: Real-time detection of supply droop on DSP, PHY, and interface rails in carrier-grade line cards. IC Role / Device Role / Timing Role: Fault detector with sub-20µs propagation delay and guaranteed operation at −40°C to +85°C. Use Value: Enables immediate hardware reset before data corruption occurs - meets GR-63-CORE thermal and reliability requirements. |
| High-End Printer Engine Control | Data Storage Controller Board |
Use Scenario: Supervision of motor driver, logic, sensor, and USB interface supplies in laser printer engine subsystems. IC Role / Device Role / Timing Role: Multirail supervisor with adjustable fourth input for custom sensor bias or heater supply monitoring. Use Value: Supports field-replaceable modules with varying auxiliary rail voltages - eliminates redesign when adding new print engine variants. | Use Scenario: Monitoring of +5V, +3.3V, +2.5V, and +1.8V rails powering SATA controller, flash buffer, and SERDES in enterprise SSD controller boards. IC Role / Device Role / Timing Role: Precision voltage monitor with −10% threshold on +2.5V rail to accommodate tight DDR memory supply tolerances. Use Value: Prevents write corruption during brown-out events - satisfies JEDEC JESD22-A102 reliability testing for storage applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6339BUB | Same pinout and thresholds, but includes manual reset input (MR) and watchdog timer | Required where system-level reset initiation or timeout supervision is needed beyond voltage monitoring | Select MAX6339BUB if MR assertion or watchdog timeout functionality is required; otherwise MAX6338BUB offers lower cost and simpler integration |
| TPS3307-33D | Triple monitor (not quad); fixed +3.3V, +5.0V, and adjustable inputs; different pinout and no −5V option | Suitable only when exactly three rails require monitoring and auxiliary input suffices for fourth domain | Choose TPS3307-33D only when fourth rail supervision is unnecessary or can be handled externally; not drop-in compatible |
Compared with MAX6339BUB and TPS3307-33D, the MAX6338BUB provides optimal balance of quad-rail coverage, minimal external components, and µMAX footprint - ideal for space-constrained multivoltage systems where reset sequencing or watchdog functions are managed elsewhere.
Availability
MAX6338BUB is available at Aetrix Electronics and suitable for desktop computers, telecommunications infrastructure, and industrial control systems requiring stable component supply and long-term production continuity.
Supply support for MAX6338BUB 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX6338 product line delivers compact, low-power voltage supervision solutions for multirail digital systems - designed specifically to replace discrete comparator-based monitors in space- and power-sensitive applications.
FAQ
What are the exact factory-programmed threshold voltages for MAX6338BUB?
The MAX6338BUB has IN1 set to +5.0V with −5% trip (4.63V), IN2 to +3.3V with −5% trip (3.08V), IN3 to +2.5V with −10% trip (2.19V), and IN4 as adjustable via external resistor divider referenced to the 1.23V internal bandgap. These values are trimmed at wafer test and guaranteed over temperature.
Can MAX6338BUB monitor negative voltages like −5.0V?
No - the MAX6338BUB variant does not support −5.0V monitoring. That function is assigned to other members of the family such as MAX6338MUB/N/PUB. The MAX6338BUB's IN4 is adjustable only for positive voltages using the 1.23V reference and external resistor divider.
Does MAX6338BUB require external pull-up resistors on its outputs?
No - the MAX6338BUB includes internal 10µA weak pull-ups to VCC on all four open-drain outputs (OUT1–OUT4). External pull-ups are optional and only needed if higher drive strength, different logic voltage level, or faster rise time is required.
How does the undervoltage lockout (UVLO) function in MAX6338BUB?
The MAX6338BUB's UVLO circuit disables all internal comparators and forces OUT1–OUT4 low whenever VCC drops below 2.5V. This ensures outputs remain in a known safe state during power-up, power-down, or brownout conditions - critical for deterministic system reset behavior.
Is MAX6338BUB compatible with lead-free solder reflow processes?
Yes - the MAX6338BUB is offered in both leaded and lead-free packaging. To specify lead-free, add the "+" suffix to the part number (e.g., MAX6338BUB+) when ordering. The µMAX package is rated for standard Pb-free reflow profiles up to 260°C peak.
MAX6338BUB 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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 2.5V, 3.3V, 5V, Adj
- 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
MAX6338BUB FAQ
1.How can I place an order for MAX6338BUB through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6338BUB 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 MAX6338BUB reliable?
The price and inventory of MAX6338BUB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6338BUB is usually 5 days.
3.What payment methods are accepted for MAX6338BUB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6338BUB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6338BUB?
MAX6338BUB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6338BUB 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 MAX6338BUB?
For technical support, including MAX6338BUB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6338BUB requirements.
6.How does Aetrix verify that MAX6338BUB is sourced from the original manufacturer or authorized distributors?
All MAX6338BUB 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 MAX6338BUB meets industry standards.
7.What is the process for return or replacement of MAX6338BUB?
All MAX6338BUB units undergo pre-shipment inspection (PSI). If there is an issue with MAX6338BUB, 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 MAX6338BUB part is unused and in its original packaging.
Return procedure for MAX6338BUB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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