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Analog Devices Inc./Maxim Integrated MAX6338DUB
- Part No.:
- MAX6338DUB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6338DUB.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,086
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Product details
Overview
The MAX6338DUB from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V, +3.3V, +1.8V (with 5% tolerance), and an adjustable input using a 1.23V internal reference. It features four independent open-drain active-low outputs, consumes 25µA typical supply current, operates from +2.5V to +5.5V, and is guaranteed over -40°C to +85°C. It is used in desktop computers and networking equipment for reliable power-good signaling.
For engineers reviewing the MAX6338DUB datasheet, MAX6338DUB pinout, MAX6338DUB application, or MAX6338DUB equivalent, this page delivers verified electrical parameters, factory-programmed threshold configuration (+5.0V/-5%, +3.3V/-5%, +1.8V/-5%, adjustable), µMAX package dimensions, wire-OR output capability, and real-world supervisory use cases without external components.
Technical Context
The MAX6338DUB integrates four comparators sharing a precision 1.23V bandgap reference; IN1–IN3 are connected to factory-laser-trimmed resistor dividers for fixed thresholds, while IN4 connects directly to the comparator's noninverting input for user-adjustable monitoring. Each comparator includes built-in 0.3% hysteresis to prevent noise-induced oscillation at trip points.
Its undervoltage lockout (UVLO) circuit disables all outputs when VCC drops below +2.5V, forcing OUT1–OUT4 low down to VCC = +1V. Outputs feature weak 10µA internal pull-ups to VCC and support wire-OR connection - enabling single-point "power good" aggregation without external logic.
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 |
| Input Thresholds | +5.0V (-5%), +3.3V (-5%), +1.8V (-5%), adjustable (1.23V ref) - matches common CPU/core/memory rail tolerances |
| Output Type | Four open-drain, active-low outputs with 10µA internal pull-up - allows flexible interfacing with 1.8V–5.5V logic and wire-OR summation |
| Temperature Range | -40°C to +85°C - qualified for industrial and commercial computing environments |
| Threshold Accuracy | ±1.5% over temperature - ensured by laser-trimmed resistors and 60ppm/°C bandgap reference |
| Propagation Delay | 20µs max - provides deterministic response for power sequencing and fault logging |
Pinout & Package
The MAX6338DUB is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height, 0.5mm pitch), compatible with standard surface-mount assembly processes and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN1 | +5.0V input (−5% threshold) | Monitors main system rail; trips low at ≤4.63V - ensures stable operation before brownout |
| 2 IN2 | +3.3V input (−5% threshold) | Supervises I/O or peripheral rail; trips low at ≤3.08V - guards against interface failures |
| 3 IN3 | +1.8V input (−5% threshold) | Tracks core logic or memory rail; trips low at ≤1.58V - prevents data corruption in low-voltage domains |
| 4 IN4 | Adjustable input (1.23V reference) | Configurable via external resistor divider - supports custom rails (e.g., +2.8V, +4.2V) or level translation |
| 5 GND | Analog/digital ground reference | Common return for all comparators and UVLO circuitry - requires low-impedance local grounding |
| 6 OUT4 | Active-low open-drain output for IN4 | Drives low when IN4 falls below set threshold - enables OR-ing with other outputs for composite power-good signal |
| 7 OUT3 | Active-low open-drain output for IN3 | Independent fault reporting for +1.8V domain - simplifies debug of isolated rail failures |
| 8 OUT2 | Active-low open-drain output for IN2 | Isolates +3.3V status from other rails - supports modular power sequencing verification |
| 9 OUT1 | Active-low open-drain output for IN1 | Primary system power indicator - often tied to processor RESET or FPGA INIT_B |
| 10 VCC | Positive supply input | Powers internal circuitry and enables internal pull-ups; UVLO forces all outputs low if < +2.5V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed thresholds | Eliminates need for external resistors on IN1–IN3 - reduces BOM count and layout area for +5V/+3.3V/+1.8V monitoring |
| Adjustable fourth input | Supports custom voltage detection (e.g., +2.8V, +4.2V) or digital level translation using only two external resistors |
| Built-in 0.3% hysteresis | Prevents chatter during slow-rising/falling supply transitions - no external feedback network required |
| Wire-OR capable outputs | Enables single "power good" bus using external pull-up - simplifies system-level power sequencing without additional logic gates |
| Undervoltage lockout (UVLO) | Maintains known output state (all low) during VCC ramp-up/down - prevents spurious resets during power cycling |
Applications
| Desktop Computer Power Supervision | Networking Equipment Rail Monitoring |
|---|---|
Use Scenario: Monitoring +5V, +3.3V, +1.8V, and auxiliary +2.5V rails in a dual-core motherboard with PCIe slots and USB controllers. IC Role / Device Role / Timing Role: Quad voltage supervisor providing independent reset assertion per rail failure, with coordinated power-good assertion after all rails stabilize. Use Value: Prevents boot failure due to marginal +1.8V core voltage by asserting reset before CPU initialization begins. | Use Scenario: Supervising power supplies in a 1U rack-mounted Ethernet switch with multiple ASICs, PHYs, and management controllers. IC Role / Device Role / Timing Role: Centralized rail health monitor feeding fault signals to microcontroller-based system manager for SNMP alerting and graceful shutdown. Use Value: Detects +3.3V droop under burst traffic load and triggers thermal throttling before packet loss occurs. |
| Industrial Embedded Controller | High-End Printer Mainboard |
Use Scenario: Ensuring clean startup of an ARM-based PLC controller with isolated +5V analog, +3.3V digital, +1.8V FPGA, and adjustable +2.8V sensor bias rail. IC Role / Device Role / Timing Role: Fault-detection hub generating interrupt on any rail deviation, with IN4 configured for precise +2.8V sensor reference monitoring. Use Value: Catches early-stage +1.8V regulator degradation before FPGA configuration errors manifest as field failures. | Use Scenario: Managing power sequencing and fault detection across motor drivers, printhead heaters, logic rails, and adjustable high-voltage bias in a color laser printer. IC Role / Device Role / Timing Role: Supervisor coordinating heater enable timing with +5V stability, while IN4 monitors custom +4.5V bias rail via resistor divider. Use Value: Prevents printhead damage by disabling heater activation until +4.5V bias reaches full regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6337DUB | Same pinout and thresholds, but lacks adjustable IN4 - IN4 fixed to −5.0V input | Not suitable where user-defined positive rail monitoring is required | Select MAX6337DUB only if −5V supervision is needed instead of adjustable monitoring |
| TPS3307-33D | Triple monitor (not quad); +3.3V, +5.0V, +1.8V thresholds; no adjustable input; higher ICC (45µA typ) | Requires external circuitry to add fourth rail monitoring or level translation | Choose TPS3307-33D only when third-rail-only supervision suffices and board space permits added discretes |
Compared with MAX6337DUB and TPS3307-33D, the MAX6338DUB uniquely delivers four-rail supervision with one user-configurable input in the same µMAX footprint - eliminating design compromises between rail count, flexibility, and layout density.
Availability
MAX6338DUB is available at Aetrix Electronics and suitable for desktop computers, networking equipment, and industrial embedded controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6338DUB 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, computing, and communications applications.
The MAX6338 series was developed specifically for multivoltage system supervision in space-constrained, high-reliability platforms - delivering integrated quad monitoring without external components or layout overhead.
FAQ
What are the factory-programmed input thresholds for MAX6338DUB?
The MAX6338DUB is factory-programmed to monitor +5.0V (−5% threshold = 4.63V), +3.3V (−5% threshold = 3.08V), +1.8V (−5% threshold = 1.58V), and an adjustable input referenced to 1.23V. These values are laser-trimmed and specified over −40°C to +85°C. The MAX6338DUB does not support −5.0V or +2.5V on IN3 - only the +1.8V option with 5% tolerance is implemented per the Selector Guide.
Can MAX6338DUB monitor a +2.5V rail?
No, the MAX6338DUB does not monitor +2.5V. Per the Selector Guide, its IN3 input is configured for +1.8V (−5%), not +2.5V. To supervise +2.5V, select MAX6338AUB (−10% tolerance) or MAX6338BUB (−5% tolerance), both of which assign +2.5V to IN3. The MAX6338DUB's fourth input (IN4) can be externally configured for +2.5V using a resistor divider, but that requires design effort and occupies the adjustable channel.
Does MAX6338DUB require external pull-up resistors on its outputs?
The MAX6338DUB includes weak 10µA internal pull-ups to VCC on all four outputs, so external pull-ups are optional. However, external pull-ups are required if interfacing with logic operating above VCC (e.g., 5V-tolerant inputs powered by +3.3V VCC) or to strengthen drive strength beyond 10µA. The MAX6338DUB's outputs remain functional with internal pull-ups alone for standard 3.3V/5V CMOS loads.
How does the undervoltage lockout (UVLO) function in MAX6338DUB?
The MAX6338DUB's UVLO circuit forces all four outputs low whenever VCC drops below +2.5V, and maintains that state down to VCC = +1V. This ensures predictable behavior during power-up, power-down, or brownout conditions. Unlike many supervisors, the MAX6338DUB continues asserting low outputs even below its minimum operating voltage - a key reliability feature confirmed in the Absolute Maximum Ratings table and Functional Diagram.
Is MAX6338DUB pin-compatible with other MAX6338 variants?
Yes, all MAX6338 variants (including MAX6338DUB) share identical 10-pin µMAX packaging and pinout - IN1 through IN4, GND, OUT4 through OUT1, and VCC occupy the same positions across the family. Threshold configurations differ only in internal laser trimming; no PCB changes are needed when substituting between MAX6338xUB parts, provided system-level voltage requirements align with the selected variant's programmed thresholds.
MAX6338DUB 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:
- 1.8V, 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
MAX6338DUB FAQ
1.How can I place an order for MAX6338DUB through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6338DUB 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 MAX6338DUB reliable?
The price and inventory of MAX6338DUB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6338DUB is usually 5 days.
3.What payment methods are accepted for MAX6338DUB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6338DUB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6338DUB?
MAX6338DUB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6338DUB 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 MAX6338DUB?
For technical support, including MAX6338DUB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6338DUB requirements.
6.How does Aetrix verify that MAX6338DUB is sourced from the original manufacturer or authorized distributors?
All MAX6338DUB 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 MAX6338DUB meets industry standards.
7.What is the process for return or replacement of MAX6338DUB?
All MAX6338DUB units undergo pre-shipment inspection (PSI). If there is an issue with MAX6338DUB, 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 MAX6338DUB part is unused and in its original packaging.
Return procedure for MAX6338DUB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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