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Analog Devices Inc./Maxim Integrated MAX6338AUB+
- Part No.:
- MAX6338AUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6338AUB+.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,618
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Product details
Overview
MAX6338AUB+ from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V (−10%), +3.3V (−10%), +2.5V (−10%), and an adjustable input with 1.23V internal reference. It delivers 25µA typical supply current, operates from +2.5V to +5.5V, and guarantees accurate trip thresholds across −40°C to +85°C. Used in desktop computers and telecom equipment for power-good signaling and supply fault detection.
For engineers reviewing the MAX6338AUB+ datasheet, MAX6338AUB+ pinout, MAX6338AUB+ application, or MAX6338AUB+ equivalent, key selection criteria include factory-programmed −10% tolerance thresholds on all four inputs, open-drain active-low outputs with weak internal pull-ups to VCC, µMAX package footprint constraints, and compatibility with wire-ORed "power good" bus architectures.
Technical Context
The MAX6338AUB+ integrates four independent comparators, each with its inverting input tied to a precision 1.23V bandgap reference and noninverting input connected via factory-laser-trimmed resistor dividers to IN1–IN4. Thresholds are fixed at −10% of nominal voltages: 4.50V (for +5.0V), 2.97V (for +3.3V), and 2.25V (for +2.5V), with IN4 configurable via external resistor divider.
All outputs are open-drain, active-low, and internally pulled up with ~10µA current to VCC - enabling direct wire-OR connection without external components. An undervoltage lockout circuit disables all outputs below VCC = 2.5V, and built-in 0.3% hysteresis eliminates 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 or dedicated bias supply without level-shifting. |
| Supply Current (typ) | 25µA at VCC = +5V - enables always-on supervision in battery-backed or low-power systems. |
| Threshold Accuracy | ±3% over −40°C to +85°C - ensures reliable trip points without calibration across industrial temperature range. |
| Propagation Delay | 20µs max - provides fast response to supply droop while avoiding noise-induced false triggers. |
| Output Type | Four independent open-drain, active-low outputs with 10µA internal pull-up to VCC - simplifies logic interfacing and enables shared "power good" bus. |
| Threshold Hysteresis | 0.3% - suppresses chatter near trip point without external components or design overhead. |
| Adjustable Input Reference | 1.23V ±3% internal bandgap - allows precise user-defined threshold setting for IN4 using two external resistors. |
Pinout & Package
The MAX6338AUB+ 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 (−10% threshold) | Monitors primary system rail; trips low when voltage falls below 4.50V. |
| 2 IN2 | +3.3V input (−10% threshold) | Supervises I/O or peripheral rail; activates OUT2 below 2.97V. |
| 3 IN3 | +2.5V input (−10% threshold) | Tracks core logic or analog supply; asserts OUT3 below 2.25V. |
| 4 IN4 | Adjustable input (1.23V reference) | Configurable threshold via external resistor divider; supports custom or negative rail monitoring. |
| 5 GND | Analog/digital ground reference | Common return for all comparators and internal reference; requires low-impedance PCB connection. |
| 6 OUT4 | Active-low open-drain output | Asserts low when IN4 drops below set threshold; requires external pull-up for logic-high state. |
| 7 OUT3 | Active-low open-drain output | Asserts low when IN3 drops below 2.25V; shares wire-OR bus with other outputs. |
| 8 OUT2 | Active-low open-drain output | Asserts low when IN2 drops below 2.97V; compatible with 3.3V or 5V logic families. |
| 9 OUT1 | Active-low open-drain output | Asserts low when IN1 drops below 4.50V; used for primary power-good indication. |
| 10 VCC | Positive supply input | Power source for internal circuitry; undervoltage lockout forces all outputs low below 2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed −10% thresholds | Eliminates need for external resistors on IN1–IN3, reducing BOM count and layout area. |
| Adjustable fourth input (IN4) | Supports custom voltage monitoring (e.g., +1.8V, −5.0V, or intermediate values) using only two external resistors. |
| 25µA supply current | Enables continuous supervision in always-on subsystems without compromising system-level power budget. |
| Integrated 0.3% hysteresis | Prevents output oscillation during slow-moving or noisy supply transitions - no external feedback required. |
| Wire-ORable open-drain outputs | Allows consolidation of four fault signals into one shared "power good" line, reducing GPIO usage on host controller. |
Applications
| Desktop Computer Power Sequencing | Telecom Line Card Supervision |
|---|---|
|
Use Scenario: Simultaneous monitoring of +5V, +3.3V, +2.5V, and +1.2V (via IN4) rails during CPU and chipset power-up sequences. IC Role / Device Role / Timing Role: Quad voltage supervisor ensuring all supplies meet specification before releasing reset to processor and southbridge. Use Value: Prevents boot failure by asserting system reset until all four monitored rails stabilize within −10% tolerance. |
Use Scenario: Monitoring redundant +5V, +3.3V, +2.5V, and −48V bias supplies on a carrier-grade line card with hot-swap capability. IC Role / Device Role / Timing Role: Fault detector feeding OR'd output to FPGA-based system manager for real-time supply health reporting. Use Value: Enables immediate failover or alarm generation upon any single-rail undervoltage event, meeting ITU-T reliability requirements. |
| Industrial PLC I/O Module | Network Switch ASIC Power Management |
|
Use Scenario: Supervising isolated +5V, +3.3V, +2.5V, and auxiliary +12V analog front-end supply in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Independent rail monitor providing discrete fault flags to microcontroller for diagnostic logging and LED status indication. Use Value: Delivers deterministic, low-latency fault detection (<20µs) critical for safety-critical I/O module uptime compliance. |
Use Scenario: Validating power integrity across multiple ASIC voltage domains (+5V, +3.3V, +2.5V, and core +1.1V via IN4) in a 10G Ethernet switch. IC Role / Device Role / Timing Role: Pre-boot supervisor verifying supply stability prior to ASIC configuration and SerDes initialization. Use Value: Avoids configuration corruption by holding reset until all four domains exceed their −10% thresholds with built-in hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809E33DBZR | Single-channel 3.3V supervisor with manual reset; no multi-rail or adjustable input capability. | Limited to monitoring one rail; requires four separate devices plus external logic to replicate MAX6338AUB+ functionality. | Select only when supervising a single supply with tight cost constraints and no need for integration. |
| ADM1185ARMZ-REEL | Quad supervisor with fixed +5V/+3.3V/+2.5V/+1.8V thresholds and 5% tolerance option; no adjustable input. | Matches MAX6338AUB+ pin count and package but lacks IN4 configurability and uses different threshold tolerances. | Choose when system requires 5% tolerance on +1.8V rail and no custom voltage monitoring is needed. |
Compared with TLV809E33DBZR and ADM1185ARMZ-REEL, the MAX6338AUB+ uniquely combines factory-set −10% thresholds on three rails with a fourth fully adjustable input - enabling single-chip supervision of heterogeneous voltage domains without external components or additional ICs.
Availability
MAX6338AUB+ is available at Aetrix Electronics and suitable for desktop computers, telecommunications infrastructure, and industrial PLCs requiring stable component supply with guaranteed long-term manufacturability and lead-free compliance.
Supply support for MAX6338AUB+ 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 high-reliability semiconductor solutions for industrial, communications, and computing markets.
The MAX6338 product line delivers integrated multirail supervision ICs optimized for space-constrained, low-power systems where accuracy, temperature stability, and minimal external components are critical design requirements.
FAQ
What is the exact threshold voltage for IN1 on the MAX6338AUB+?
The MAX6338AUB+ has a factory-programmed −10% threshold on IN1 for +5.0V nominal input, resulting in a trip point of 4.50V (min) to 4.75V (max) as specified in the Electrical Characteristics table. This threshold is trimmed at wafer test and guaranteed over −40°C to +85°C with ±3% accuracy relative to nominal.
Can the MAX6338AUB+ monitor a −5.0V supply?
No - the MAX6338AUB+ variant is configured for +5.0V, +3.3V, +2.5V, and adjustable inputs only. To monitor −5.0V, select MAX6338MUB, MAX6338NUB, MAX6338OUB, or MAX6338PUB, which explicitly assign IN4 to −5.0V with +5% or +10% tolerance options.
Does the MAX6338AUB+ require external pull-up resistors on its outputs?
Each output of the MAX6338AUB+ includes a weak 10µA internal pull-up to VCC, sufficient for driving CMOS inputs directly. External pull-ups are optional and only needed when interfacing with higher-voltage logic (e.g., 12V) or when stronger drive capability is required - in which case external pull-ups must not back-feed current into VCC due to internal isolation.
How does the undervoltage lockout (UVLO) function in the MAX6338AUB+?
The MAX6338AUB+ UVLO circuit forces all four outputs low whenever VCC drops below +2.5V, regardless of input voltage states. This ensures clean, predictable behavior during brownout or power-down conditions and prevents spurious resets caused by marginal VCC operation.
What is the maximum sink current supported by each output of the MAX6338AUB+?
Each open-drain output of the MAX6338AUB+ is rated for continuous sink current up to 20mA, with VOL ≤ 0.4V at ISINK = 2mA and VCC = +5V. The device remains functional down to VCC = +1V, though output drive strength degrades linearly with supply voltage.
MAX6338AUB+ 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:
- 2.19V, 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
MAX6338AUB+ FAQ
1.How can I place an order for MAX6338AUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6338AUB+ 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 MAX6338AUB+ reliable?
The price and inventory of MAX6338AUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6338AUB+ is usually 5 days.
3.What payment methods are accepted for MAX6338AUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6338AUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6338AUB+?
MAX6338AUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6338AUB+ 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 MAX6338AUB+?
For technical support, including MAX6338AUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6338AUB+ requirements.
6.How does Aetrix verify that MAX6338AUB+ is sourced from the original manufacturer or authorized distributors?
All MAX6338AUB+ 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 MAX6338AUB+ meets industry standards.
7.What is the process for return or replacement of MAX6338AUB+?
All MAX6338AUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6338AUB+, 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 MAX6338AUB+ part is unused and in its original packaging.
Return procedure for MAX6338AUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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