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Analog Devices Inc./Maxim Integrated MAX6338KUB+
- Part No.:
- MAX6338KUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6338KUB+.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,284
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Product details
Overview
MAX6338KUB+ from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, featuring factory-programmed thresholds for IN1 (adjustable), IN2 (+3.3V), IN3 (+2.5V), and IN4 (adjustable), all with ±10% supply tolerance support. It delivers 25µA typical supply current, operates from +2.5V to +5.5V, and guarantees accurate trip points across –40°C to +85°C using an internal 1.23V bandgap reference. It is deployed in desktop/notebook computers for real-time power-rail health monitoring.
For engineers reviewing the MAX6338KUB+ datasheet, MAX6338KUB+ pinout, MAX6338KUB+ application, or MAX6338KUB+ equivalent, this page provides verified technical context, exact threshold mapping per input, open-drain output behavior under undervoltage lockout, wire-OR capability, and validated alternatives for multirail supervisory designs requiring no external components.
Technical Context
The MAX6338KUB+ integrates four independent comparators, each with its own open-drain active-low output and dedicated input threshold. IN1 and IN4 are auxiliary inputs tied to the internal 1.23V reference via external resistor dividers, enabling user-adjustable trip points; IN2 and IN3 are fixed at +3.3V and +2.5V nominal with –10% trip thresholds (2.97V and 2.25V respectively).
Internal undervoltage lockout forces all outputs low when VCC drops below +2.5V. Each output features a weak 10µA internal pull-up to VCC, supporting wire-OR configuration without external resistors, and tolerates external pull-up voltages up to +5.5V with isolation from VCC.
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 +2.5V supplies. |
| Supply Current (typ) | 25µA at VCC = +5V - enables always-on supervision in battery-backed or low-power systems. |
| IN2 Threshold | +3.3V (–10%) = 2.97V - triggers OUT2 low when +3.3V rail drops below 2.97V, matching common ATX spec. |
| IN3 Threshold | +2.5V (–10%) = 2.25V - ensures reliable detection of +2.5V rail collapse before logic failure. |
| Adjustable Threshold Accuracy | 1.20V to 1.26V (±2.5% over temp) - sets precise trip point for IN1/IN4 using external resistor divider. |
| Output Type | Open-drain with 10µA internal pull-up - allows flexible logic interfacing and wire-OR "power good" aggregation. |
| Hysteresis | 0.3% - eliminates noise-induced chatter without external feedback components. |
Pinout & Package
The MAX6338KUB+ is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height, 0.5mm pitch), RoHS-compliant and available in lead-free (+) version.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1) | Auxiliary input | User-adjustable threshold via resistor divider to 1.23V reference; supports custom rail monitoring. |
| 2 (IN2) | Fixed +3.3V monitor input | Factory-trimmed for –10% trip at 2.97V; no external components required. |
| 3 (IN3) | Fixed +2.5V monitor input | Factory-trimmed for –10% trip at 2.25V; optimized for core logic rail supervision. |
| 4 (IN4) | Auxiliary input | Second user-adjustable input; enables dual-custom threshold or window detection with IN1. |
| 5 (GND) | Analog/digital ground | Common return for all comparators and reference circuitry; requires low-impedance PCB connection. |
| 6 (OUT4) | Active-low open-drain output | Goes low when IN4 falls below its threshold; internally pulled up to VCC (10µA). |
| 7 (OUT3) | Active-low open-drain output | Goes low when IN3 falls below 2.25V; compatible with 3.3V/2.5V logic families. |
| 8 (OUT2) | Active-low open-drain output | Goes low when IN2 falls below 2.97V; supports reset assertion for microcontrollers. |
| 9 (OUT1) | Active-low open-drain output | Goes low when IN1 falls below user-set threshold; enables custom reset or alert signaling. |
| 10 (VCC) | Power supply input | +2.5V to +5.5V supply; internal UVLO disables all outputs if VCC < 2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent monitoring | Four separate comparator channels with dedicated outputs-enables discrete reset control per rail without multiplexing. |
| No external components required | Factory-trimmed thresholds for IN2/IN3 and integrated 1.23V reference eliminate need for precision resistors or trimming. |
| Wire-OR output capability | All outputs are open-drain with internal pull-ups-allows single "power good" bus without external diodes or logic gates. |
| Extended temperature operation | Specified from –40°C to +85°C with <60ppm/°C threshold drift-ensures reliability in industrial and computing environments. |
| Low-supply-current supervision | 25µA typical ICC enables integration into always-on subsystems without impacting standby power budgets. |
Applications
| Desktop Computer Power Sequencing | Notebook System Health Monitoring |
|---|---|
|
Use Scenario: Simultaneous monitoring of +5V, +3.3V, +2.5V, and +1.8V rails during boot and runtime in ATX-compliant motherboards. IC Role / Device Role / Timing Role: Quad voltage supervisor asserting individual reset signals to CPU, chipset, memory controller, and I/O hub based on rail-specific fault conditions. Use Value: Prevents system lockup by isolating faults to specific rails-e.g., OUT2 low halts PCIe initialization while preserving USB controller operation. |
Use Scenario: Real-time voltage supervision of core logic (+3.3V), DDR interface (+2.5V), adjustable GPU core rail, and adjustable I/O rail in thin-and-light notebooks. IC Role / Device Role / Timing Role: Fault-detection engine feeding PMIC and EC with asynchronous rail-fail alerts to trigger graceful shutdown or dynamic throttling. Use Value: Enables adaptive power management-e.g., IN1-adjusted threshold detects GPU rail sag before thermal throttling, allowing preemptive clock scaling. |
| Industrial PLC Power Integrity | Networking Equipment Supervisor |
|
Use Scenario: Monitoring of isolated +24V-derived +5V, +3.3V, +2.5V, and field-bus interface rails in programmable logic controllers operating at –40°C to +70°C. IC Role / Device Role / Timing Role: Primary supervisory IC asserting hardware reset to ARM Cortex-M7 MCU and FPGA configuration logic upon any rail deviation. Use Value: Guarantees deterministic reset timing-OUT3 low at 2.25V ensures FPGA config memory retention until +2.5V stabilizes post-power-cycle. |
Use Scenario: Supervision of +5V backplane, +3.3V switch ASIC, +2.5V PHY, and adjustable PoE controller rail in managed Ethernet switches. IC Role / Device Role / Timing Role: Centralized power-good arbiter generating combined "system ready" signal via wire-OR'd outputs to CPLD-based control plane. Use Value: Eliminates external OR-gate and reduces BOM count-wire-OR of OUT1–OUT4 directly drives CPLD enable pin with <100ns propagation delay. |
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 3.3V supervisor (–5% threshold), SOT-23-3; no multi-rail or adjustable inputs. | Only monitors one rail; lacks quad capability, wire-OR, or auxiliary inputs. | Select only when supervising a single critical +3.3V rail with minimal footprint. |
| ADM1266ACPZ | 16-channel sequencer/supervisor with digital interface (PMBus), 64-pin LFCSP; requires firmware configuration. | Supports complex sequencing, margining, and telemetry-not drop-in for simple analog supervision. | Choose for high-end systems needing programmable timing, fault logging, or remote monitoring. |
Compared with TLV809E33DBZR and ADM1266ACPZ, the MAX6338KUB+ uniquely balances simplicity (no programming), analog flexibility (two adjustable inputs), and compact integration (quad monitoring in 10-pin µMAX), making it optimal for cost-sensitive, space-constrained multirail systems where deterministic analog response is required.
Availability
MAX6338KUB+ is available at Aetrix Electronics and suitable for desktop computers, notebook systems, industrial PLCs, and networking equipment requiring stable component supply and guaranteed long-term manufacturability.
Supply support for MAX6338KUB+ 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 family was designed specifically for multivoltage system supervision in space-constrained platforms-delivering accurate, low-power, component-free rail monitoring with configurable thresholds and robust temperature performance.
FAQ
What is the exact threshold voltage for IN2 on the MAX6338KUB+?
The IN2 input on the MAX6338KUB+ is factory-programmed for +3.3V nominal with –10% tolerance, resulting in a guaranteed trip threshold between 2.97V and 3.00V (per datasheet Table "ELECTRICAL CHARACTERISTICS"). This value is trimmed and tested across temperature, ensuring reliable detection of +3.3V rail collapse without external calibration. The MAX6338KUB+ uses this fixed threshold to assert OUT2 low when the monitored +3.3V supply falls below specification.
Can IN1 and IN4 on the MAX6338KUB+ be used simultaneously for window detection?
Yes-the MAX6338KUB+ supports window detection by configuring IN1 as the upper threshold and IN4 as the lower threshold (or vice versa), leveraging their shared 1.23V internal reference and external resistor dividers. The device's independent open-drain outputs (OUT1 and OUT4) can drive external logic to generate a valid window signal. This configuration is explicitly documented in the MAX6338KUB+ datasheet Figure 4 ("Window Detection") and requires no additional ICs. The MAX6338KUB+ thus enables compact, analog window monitoring without op-amps or comparators.
Does the MAX6338KUB+ require external pull-up resistors on its outputs?
No-the MAX6338KUB+ integrates 10µA internal pull-up current sources on all four outputs (OUT1–OUT4) referenced to VCC, eliminating the need for external pull-up resistors in most applications. These weak pull-ups allow direct wire-OR connection and compatibility with standard CMOS/TTL logic. External pull-ups may be added only if higher sink current capability or voltage-level translation (e.g., to 1.8V logic) is required-but the MAX6338KUB+ functions fully without them, reducing BOM count and board area.
What happens to the outputs of the MAX6338KUB+ when VCC drops below 2.5V?
When VCC drops below +2.5V, the MAX6338KUB+'s internal undervoltage lockout (UVLO) circuit activates and forces all four outputs (OUT1–OUT4) low, regardless of input voltage states. This behavior is guaranteed down to VCC = +1V (per Absolute Maximum Ratings), ensuring fail-safe reset assertion during brownout conditions. The MAX6338KUB+ maintains this state until VCC rises above +2.5V and stabilizes, providing robust power-fail protection for downstream logic. No external UVLO circuitry is needed-the MAX6338KUB+ handles it autonomously.
How is the adjustable threshold accuracy specified for the MAX6338KUB+?
The MAX6338KUB+ adjustable threshold is based on an internal 1.23V bandgap reference with a guaranteed range of 1.20V to 1.26V (±2.5%) over temperature (–40°C to +85°C), and a temperature coefficient of ≤60ppm/°C. This reference sets the trip point for IN1 and IN4 when used with external resistor dividers. The MAX6338KUB+ datasheet specifies this tolerance in the "ELECTRICAL CHARACTERISTICS" table under "Adjustable Threshold", ensuring predictable design margins for custom voltage monitoring applications.
MAX6338KUB+ 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, Adj, 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
MAX6338KUB+ FAQ
1.How can I place an order for MAX6338KUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6338KUB+ 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 MAX6338KUB+ reliable?
The price and inventory of MAX6338KUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6338KUB+ is usually 5 days.
3.What payment methods are accepted for MAX6338KUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6338KUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6338KUB+?
MAX6338KUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6338KUB+ 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 MAX6338KUB+?
For technical support, including MAX6338KUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6338KUB+ requirements.
6.How does Aetrix verify that MAX6338KUB+ is sourced from the original manufacturer or authorized distributors?
All MAX6338KUB+ 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 MAX6338KUB+ meets industry standards.
7.What is the process for return or replacement of MAX6338KUB+?
All MAX6338KUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6338KUB+, 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 MAX6338KUB+ part is unused and in its original packaging.
Return procedure for MAX6338KUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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