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Analog Devices Inc./Maxim Integrated MAX6338BUB+T
- Part No.:
- MAX6338BUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6338BUB+T.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,107
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Product details
Overview
MAX6338BUB+T 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 operation across −40°C to +85°C in a 10-pin µMAX package - used in desktop computers and telecom power sequencing.
For engineers reviewing the MAX6338BUB+T datasheet, MAX6338BUB+T pinout, MAX6338BUB+T application, or MAX6338BUB+T equivalent, key selection criteria include factory-programmed trip thresholds per input, open-drain active-low outputs with internal 10µA pull-ups, undervoltage lockout below 2.5V, hysteresis of 0.3%, and compatibility with wire-ORed "power good" signaling.
Technical Context
The MAX6338BUB+T integrates four independent comparators, each with a dedicated input and open-drain output. Inputs IN1–IN3 are factory-trimmed for fixed nominal voltages (+5.0V, +3.3V, +2.5V) with −5% or −10% tolerance; IN4 is auxiliary, referenced to a 1.23V bandgap and configurable via external resistor divider. All comparators share the same internal reference and hysteresis circuitry.
Its undervoltage lockout (UVLO) disables all outputs when VCC drops below 2.5V, ensuring reliable reset behavior during brownout. The 10µA internal pull-ups allow direct interfacing with TTL/CMOS logic and support wire-OR configurations without external resistors - critical for compact, low-power supervisory designs.
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 monitoring in battery-backed or low-power embedded systems. |
| +5.0V Threshold Accuracy | 4.63V (−5%) - precise trip point for +5V supply monitoring with guaranteed tolerance over temperature. |
| +3.3V Threshold Accuracy | 3.08V (−5%) - matches standard ±5% supply tolerance for clean reset assertion on 3.3V domains. |
| +2.5V Threshold Accuracy | 2.19V (−10%) - optimized for tighter-tolerance 2.5V supplies common in memory and I/O subsystems. |
| Adjustable Threshold | 1.23V ±0.03V - stable internal reference enabling user-defined trip points from ~1.2V to >5V via resistor divider. |
| Propagation Delay | 20µs - ensures timely fault detection without excessive delay in safety-critical power-up sequences. |
Pinout & Package
The MAX6338BUB+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 space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN1 | +5.0V monitor input | Factory-trimmed for −5% trip at 4.63V; connects directly to +5V rail without external components. |
| 2 IN2 | +3.3V monitor input | Factory-trimmed for −5% trip at 3.08V; provides accurate reset assertion for 3.3V logic domains. |
| 3 IN3 | +2.5V monitor input | Factory-trimmed for −10% trip at 2.19V; suited for 2.5V supplies with wider tolerance specs. |
| 4 IN4 | Auxiliary adjustable input | High-impedance comparator input referenced to 1.23V; configured via external resistor divider for custom thresholds. |
| 5 GND | Analog/digital ground | Common return path for all internal comparators and reference circuitry; must be low-impedance. |
| 6 OUT4 | Active-low open-drain output | Asserts low when IN4 falls below its threshold; requires external pull-up for logic-level translation. |
| 7 OUT3 | Active-low open-drain output | Asserts low when IN3 falls below 2.19V; supports wire-OR with other outputs for composite "power good" signal. |
| 8 OUT2 | Active-low open-drain output | Asserts low when IN2 falls below 3.08V; internal 10µA pull-up enables direct CMOS/TTL interface. |
| 9 OUT1 | Active-low open-drain output | Asserts low when IN1 falls below 4.63V; synchronized timing with other outputs ensures coherent system reset. |
| 10 VCC | Power supply input | +2.5V to +5.5V supply; UVLO forces all outputs low if VCC drops below 2.5V, preventing false resets. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent monitoring | Four separate inputs/outputs enable simultaneous supervision of multiple supply rails without shared timing or accuracy trade-offs. |
| Factory-trimmed thresholds | Eliminates need for external resistors or calibration - reduces BOM count and improves long-term stability over temperature. |
| Internal 10µA pull-ups | Enables direct connection to microcontroller reset inputs or logic gates without external biasing components. |
| Built-in 0.3% hysteresis | Prevents output oscillation near trip points - no external feedback network required for noise immunity. |
| Undervoltage lockout (UVLO) | Guarantees all outputs remain low during VCC ramp-up or brownout, ensuring deterministic reset behavior. |
Applications
| Desktop Computer Power Sequencing | Telecom Line Card Supervision |
|---|---|
Use Scenario: Monitoring +5V, +3.3V, +2.5V, and +1.2V core supplies during cold boot and thermal fault conditions. IC Role / Device Role / Timing Role: Quad voltage monitor providing independent, active-low reset signals for CPU, chipset, memory, and PHY controllers. Use Value: Ensures all subsystems initialize only after all rails stabilize within spec - prevents latch-up and firmware corruption. |
Use Scenario: Supervising redundant +5V, +3.3V, +2.5V, and adjustable bias supplies on high-density line cards with hot-swap capability. IC Role / Device Role / Timing Role: Fault-detection node feeding FPGA-based system manager; outputs wired-OR'd into single interrupt line. Use Value: Reduces component count vs. discrete supervisor ICs while maintaining per-rail visibility for diagnostics and logging. |
| Industrial PLC I/O Module | Notebook Embedded Controller Interface |
Use Scenario: Monitoring isolated +5V, +3.3V, +2.5V, and field-side auxiliary supply in programmable logic controller backplane modules. IC Role / Device Role / Timing Role: Analog front-end supervisor feeding watchdog timer and status register in real-time control loop. Use Value: Internal 0.3% hysteresis and −40°C to +85°C rating ensure reliable operation in uncontrolled industrial environments. |
Use Scenario: Coordinating power-good sequencing between EC, PMIC, and main SoC in ultra-thin notebook platforms. IC Role / Device Role / Timing Role: Compact 3×3mm supervisory IC providing four independent reset assertions to embedded controller GPIOs. Use Value: µMAX package footprint minimizes PCB area; low 25µA quiescent current extends battery life during suspend-to-RAM states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6337BUB+T | Triple voltage monitor (IN1–IN3 only); no IN4 auxiliary input; identical thresholds and package. | Lacks fourth monitoring channel - suitable only where three-rail supervision suffices. | Select when system has exactly three critical supplies and board space or cost optimization is prioritized. |
| TPS3307-33DGNR | Triple-supply monitor with +3.3V, +5V, and adjustable input; 8-pin MSOP; no −5V or +1.8V support. | Missing +2.5V (−10%) channel and −40°C to +85°C extended temp grade; lower integration density. | Choose for TI-centric designs requiring pin-compatible upgrade from legacy TPS33xx family, not for full MAX6338BUB+T feature parity. |
Compared with MAX6338BUB+T, MAX6337BUB+T omits the fourth input and is unsuitable for four-rail systems, while TPS3307-33DGNR lacks the +2.5V (−10%) threshold and extended temperature guarantee - both require design review for functional coverage and environmental compliance.
Availability
MAX6338BUB+T is available at Aetrix Electronics and suitable for desktop computer power sequencing, telecom line card supervision, and industrial PLC I/O modules requiring stable component supply, long-lifecycle support, and guaranteed −40°C to +85°C operation.
Supply support for MAX6338BUB+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) 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 MAX6338 series was designed specifically for multivoltage system supervision in space-constrained, low-power applications - delivering integrated quad monitoring with factory-trimmed accuracy and minimal external components.
FAQ
What is the exact threshold voltage for the +2.5V input on MAX6338BUB+T?
The +2.5V input (IN3) on MAX6338BUB+T is factory-trimmed for a −10% tolerance, resulting in a guaranteed trip threshold of 2.19V (minimum 2.13V, maximum 2.25V) as specified in the Electrical Characteristics table. This value is measured with VIN3 decreasing and applies across the full −40°C to +85°C operating range due to internal bandgap reference stability.
Does MAX6338BUB+T support monitoring a −5.0V supply?
No, MAX6338BUB+T does not support −5.0V monitoring. Its IN1–IN3 inputs are fixed to +5.0V, +3.3V, and +2.5V respectively, and IN4 is an auxiliary input referenced to +1.23V - intended for positive adjustable thresholds only. For −5.0V monitoring, refer to MAX6338MUB/N/PUB variants explicitly listed in the Selector Guide.
Can the outputs of MAX6338BUB+T be connected together in a wire-OR configuration?
Yes, all four outputs of MAX6338BUB+T are open-drain and active-low with weak internal 10µA pull-ups to VCC, making them fully compatible with wire-OR connection. When any monitored supply fails, its corresponding output pulls low, asserting a shared "power good" signal - no external diodes or logic gates are required.
What is the purpose of the undervoltage lockout (UVLO) in MAX6338BUB+T?
The UVLO circuit in MAX6338BUB+T forces all four outputs low whenever VCC drops below 2.5V, preventing erratic or undefined behavior during power-up, brownout, or shutdown. This ensures clean, predictable reset assertion independent of input voltage states - a critical safeguard for microcontrollers and FPGAs relying on MAX6338BUB+T for system initialization.
How is the adjustable input (IN4) on MAX6338BUB+T configured for a custom threshold?
The adjustable input (IN4) on MAX6338BUB+T uses an internal 1.23V bandgap reference. To set a custom trip voltage VINTH, connect a resistor divider between the supply to monitor and GND, with the midpoint fed to IN4. Select R1 and R2 such that VINTH = 1.23V × (1 + R1/R2). For example, detecting 4.5V requires R1 ≈ 265kΩ when R2 = 100kΩ.
MAX6338BUB+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:
- 2.19V, 3.08V, 4.63V, 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+T FAQ
1.How can I place an order for MAX6338BUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6338BUB+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 MAX6338BUB+T reliable?
The price and inventory of MAX6338BUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6338BUB+T is usually 5 days.
3.What payment methods are accepted for MAX6338BUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6338BUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6338BUB+T?
MAX6338BUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6338BUB+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 MAX6338BUB+T?
For technical support, including MAX6338BUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6338BUB+T requirements.
6.How does Aetrix verify that MAX6338BUB+T is sourced from the original manufacturer or authorized distributors?
All MAX6338BUB+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 MAX6338BUB+T meets industry standards.
7.What is the process for return or replacement of MAX6338BUB+T?
All MAX6338BUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6338BUB+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 MAX6338BUB+T part is unused and in its original packaging.
Return procedure for MAX6338BUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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