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Analog Devices Inc./Maxim Integrated MAX6338CUB+T
- Part No.:
- MAX6338CUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6338CUB+T.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,299
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Product details
Overview
The MAX6338CUB+T from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V, +3.3V, +1.8V, and an adjustable input with 10% supply tolerance per channel. It consumes 25µA typical supply current, operates from +2.5V to +5.5V, and delivers four independent open-drain active-low outputs in a 10-pin µMAX package-used in desktop computers, telecom equipment, and industrial controllers for reliable power-good signaling.
For engineers reviewing the MAX6338CUB+T datasheet, MAX6338CUB+T pinout, MAX6338CUB+T application, or MAX6338CUB+T equivalent, key selection criteria include factory-programmed threshold voltages (+5.0V/-10%, +3.3V/-10%, +1.8V/-10%, adjustable), guaranteed operation from -40°C to +85°C, internal 1.23V bandgap reference, no external components required, and wire-ORable open-drain outputs with weak internal pull-ups to VCC.
Technical Context
The MAX6338CUB+T integrates four independent comparators, each with its inverting input tied to a precision 1.23V internal bandgap reference and noninverting inputs connected via factory-laser-trimmed resistor dividers to set nominal thresholds. The adjustable input (IN4) connects directly to the comparator's noninverting terminal, enabling user-defined trip points using external resistive dividers referenced to the 1.23V threshold.
Hysteresis is built-in at 0.3% to prevent noise-induced oscillation during threshold crossing, eliminating need for external feedback networks. An undervoltage lockout circuit disables all outputs when VCC drops below +2.5V, ensuring clean reset behavior across the full -40°C to +85°C temperature range without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - supports direct connection to monitored rails or dedicated bias supply without level-shifting. |
| Supply Current (typ) | 25µA at +5V - enables always-on supervision in battery-backed or low-power systems without significant load impact. |
| Threshold Accuracy | ±1.5% over temperature - ensures reliable detection margin against 10% supply tolerances across -40°C to +85°C. |
| Propagation Delay | 20µs max - provides deterministic response time for fast power-rail fault detection and system reset initiation. |
| Output Type | Four open-drain, active-low outputs with 10µA internal pull-up to VCC - allows flexible logic interfacing and wire-ORed "power good" bus formation. |
| Adjustable Threshold | 1.23V ±30mV internal reference - enables precise user-defined monitoring of any positive voltage via external resistor divider. |
| Temperature Range | -40°C to +85°C - qualified for industrial and computing environments without derating or thermal compensation circuits. |
Pinout & Package
The MAX6338CUB+T 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 offering high-density integration in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN1 | +5.0V input (−10% threshold) | Monitors primary system rail; trips low when voltage falls below 4.50V (min). |
| 2 IN2 | +3.3V input (−10% threshold) | Supervises core logic supply; asserts fault at ≤2.97V (max drop). |
| 3 IN3 | +1.8V input (−10% threshold) | Tracks low-voltage I/O or memory rail; triggers at ≤1.62V. |
| 4 IN4 | Adjustable input (1.23V reference) | Accepts user-defined threshold via external resistor divider; supports custom or negative rail monitoring. |
| 5 GND | Analog/digital ground reference | Common return for all comparators and outputs; requires low-impedance PCB connection. |
| 6 OUT4 | Active-low output for IN4 | Open-drain output pulled weakly to VCC; sinks up to 20mA; wire-OR capable. |
| 7 OUT3 | Active-low output for IN3 | Independent fault signal for +1.8V rail; compatible with 1.8V/3.3V/5V logic families. |
| 8 OUT2 | Active-low output for IN2 | Provides dedicated reset or alert for +3.3V domain; no external pull-up required. |
| 9 OUT1 | Active-low output for IN1 | Primary power-good indicator for +5V supply; asserted low on undervoltage event. |
| 10 VCC | Positive supply input | Power source for internal circuitry; includes undervoltage lockout that forces all outputs low below +2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed quad thresholds | +5.0V/−10%, +3.3V/−10%, +1.8V/−10%, adjustable - eliminates calibration effort and external resistor networks. |
| Built-in 0.3% hysteresis | Prevents chatter during slow-ramp or noisy supply transitions without external feedback components. |
| Internal 1.23V bandgap reference | Stable, temperature-compensated reference enables accurate threshold tracking across full operating range. |
| Wire-ORable open-drain outputs | Enables single aggregated "power good" signal using external pull-up, reducing GPIO count in host microcontrollers. |
| Undervoltage lockout (UVLO) | Guarantees valid output states down to VCC = +1V; prevents undefined behavior during brownout conditions. |
Applications
| Desktop Computer Power Sequencing | Industrial PLC Supervision |
|---|---|
Use Scenario: Monitoring ATX main +5V, +3.3V, +1.8V rails and auxiliary bias in motherboard power delivery. IC Role / Device Role / Timing Role: Quad voltage supervisor providing independent reset assertion per rail with coordinated timing via open-drain outputs. Use Value: Ensures CPU, chipset, and memory receive stable power before boot; eliminates need for discrete supervisors or FPGA-based monitoring. | Use Scenario: Supervising dual isolated DC supplies (+5V logic, +24V I/O) and FPGA core voltage (+1.8V) in programmable logic controller backplane. IC Role / Device Role / Timing Role: Fault-detection node triggering watchdog timeout or safe shutdown when any monitored rail deviates beyond 10% tolerance. Use Value: Prevents erroneous I/O actuation or logic corruption due to undervoltage; meets IEC 61000-4-11 immunity requirements via fast 20µs response. |
| Telecom Line Card Monitoring | High-End Printer Engine Control |
Use Scenario: Verifying +5V, +3.3V, +1.8V, and adjustable −5V bias (via IN4 configured for negative rail) on optical transceiver modules. IC Role / Device Role / Timing Role: Precision analog comparator array detecting both positive and negative supply faults with common open-drain alarm bus. Use Value: Enables hot-swap compliance and rapid link recovery by asserting fault within 20µs of rail deviation, minimizing packet loss. | Use Scenario: Tracking heater bias (+5V), motor driver logic (+3.3V), ASIC core (+1.8V), and adjustable fuser temperature sensor reference in laser printer engine board. IC Role / Device Role / Timing Role: Multirail supervisor feeding dedicated reset lines to MCU, motor controller, and thermal management ASIC. Use Value: Prevents print jam or toner smearing caused by premature activation of heating elements or motion control under marginal supply conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6339CUB+T | Same pinout and thresholds, but with 5% tolerance on IN2 (+3.3V) and IN3 (+1.8V) instead of 10%. | Used where tighter supply regulation is enforced (e.g., server-grade VRMs); requires matching tolerance spec in BOM. | Select MAX6339CUB+T only if system design mandates ±5% detection window on +3.3V/+1.8V rails. |
| TPS3307-33DGNR | Triple monitor (not quad); fixed +3.3V, +5.0V, adjustable; no +1.8V option; higher 60µA ICC. | Lacks native +1.8V monitoring - requires external resistor network or additional IC for full rail coverage. | Choose only if third rail suffices and board area permits external threshold adjustment for missing +1.8V function. |
Compared with MAX6339CUB+T and TPS3307-33DGNR, the MAX6338CUB+T uniquely delivers factory-set +1.8V/−10% monitoring in a quad-channel, low-current (25µA), µMAX package-enabling complete multirail supervision without layout or BOM complexity.
Availability
The MAX6338CUB+T is available at Aetrix Electronics and suitable for desktop computers, industrial PLCs, telecom line cards, and high-end printers requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6338CUB+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 and mixed-signal ICs for power management, sensing, and interface applications, serving industrial, computing, and communications markets.
The MAX6338 series belongs to Maxim's supervisory IC product line, engineered specifically for multivoltage system integrity-delivering accurate, low-power, pin-configurable voltage monitoring in compact packages for space- and power-sensitive applications.
FAQ
What are the exact factory-programmed threshold voltages for MAX6338CUB+T?
The MAX6338CUB+T monitors IN1 at +5.0V with −10% threshold (4.50V min), IN2 at +3.3V with −10% threshold (2.97V min), IN3 at +1.8V with −10% threshold (1.62V min), and IN4 as adjustable via external resistor divider referenced to the internal 1.23V bandgap. These values are laser-trimmed and specified in the datasheet's Selector Guide table.
Does MAX6338CUB+T support negative voltage monitoring?
Yes-the MAX6338CUB+T can monitor negative supplies when IN4 is configured with an external resistor divider that references the internal 1.23V threshold to a negative rail (e.g., −5.0V). The device's absolute maximum rating supports −6V on IN4, and the datasheet confirms −5.0V (+10%) threshold capability for versions like MAX6338MUB/PUB.
Can the outputs of MAX6338CUB+T be wired together without external components?
Yes-the MAX6338CUB+T features four open-drain outputs with weak 10µA internal pull-ups to VCC, enabling direct wire-OR connection to form a single aggregated "power good" signal. No external pull-up resistors are required unless interfacing with logic families operating above VCC or needing stronger drive strength.
What is the role of the undervoltage lockout (UVLO) in MAX6338CUB+T?
The UVLO circuit in MAX6338CUB+T forces all four outputs low whenever VCC drops below +2.5V, ensuring predictable reset behavior during brownout or startup. This feature guarantees clean, glitch-free output states down to VCC = +1V, preventing spurious resets or undefined logic levels in host systems.
Is MAX6338CUB+T compatible with 1.8V logic systems?
Yes-the MAX6338CUB+T operates from +2.5V to +5.5V and its open-drain outputs are fully compatible with 1.8V logic when pulled to a 1.8V rail externally. Its +1.8V monitoring channel (IN3) is factory trimmed for −10% tolerance (1.62V trip point), making it ideal for supervising modern low-voltage ASICs and FPGAs.
MAX6338CUB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 1.58V, 2.93V, 4.38V, 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
MAX6338CUB+T FAQ
1.How can I place an order for MAX6338CUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6338CUB+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 MAX6338CUB+T reliable?
The price and inventory of MAX6338CUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6338CUB+T is usually 5 days.
3.What payment methods are accepted for MAX6338CUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6338CUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6338CUB+T?
MAX6338CUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6338CUB+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 MAX6338CUB+T?
For technical support, including MAX6338CUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6338CUB+T requirements.
6.How does Aetrix verify that MAX6338CUB+T is sourced from the original manufacturer or authorized distributors?
All MAX6338CUB+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 MAX6338CUB+T meets industry standards.
7.What is the process for return or replacement of MAX6338CUB+T?
All MAX6338CUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6338CUB+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 MAX6338CUB+T part is unused and in its original packaging.
Return procedure for MAX6338CUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6338CUB+T Tags
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MIC826SYMT-TR
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