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Analog Devices Inc./Maxim Integrated MAX6338CUB+
- Part No.:
- MAX6338CUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6338CUB+.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,769
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Product details
Overview
MAX6338CUB+ from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V (−10%), +3.3V (−10%), +1.8V (−10%), and an adjustable input with 1.23V internal reference. It features four independent open-drain active-low outputs, 25µA typical supply current, and operates from +2.5V to +5.5V across −40°C to +85°C - used in desktop computers, telecom power systems, and industrial controllers.
For engineers reviewing the MAX6338CUB+ datasheet, MAX6338CUB+ pinout, MAX6338CUB+ application, or MAX6338CUB+ equivalent, key selection considerations include factory-programmed threshold combinations, open-drain output compatibility with wire-OR logic, undervoltage lockout behavior below 2.5V VCC, and µMAX package thermal performance in dense PCB layouts.
Technical Context
The MAX6338CUB+ integrates four comparators sharing a precision 1.23V bandgap reference; IN1–IN3 are connected to factory-laser-trimmed resistor dividers for fixed thresholds (+5.0V, +3.3V, +1.8V), while IN4 connects directly to the comparator's noninverting input for user-adjustable monitoring. Each comparator includes built-in 0.3% hysteresis to suppress noise-induced oscillation without external components.
All outputs are open-drain with weak 10µA internal pull-ups to VCC, enabling flexible interfacing with 1.8V–5.5V logic families and wire-ORed "power good" signaling. An internal undervoltage lockout forces all outputs low when VCC drops below 2.5V, ensuring reliable reset assertion during brownout conditions down to 1V.
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 or +5.0V supplies. |
| Supply Current (typ) | 25µA at +5V - enables always-on supervision in battery-backed or low-power embedded systems. |
| Threshold Accuracy | ±1.5% over −40°C to +85°C - ensures reliable trip points without calibration across industrial temperature range. |
| Output Type | Four open-drain, active-low outputs with 10µA internal pull-up - allows logic-level translation and wired-AND reset aggregation. |
| Threshold Hysteresis | 0.3% - eliminates need for external hysteresis resistors and prevents chatter near trip points. |
| Operating Temperature | −40°C to +85°C - qualified for use in telecom equipment, industrial PLCs, and computing peripherals. |
| Propagation Delay | 20µs max (with 50mV overdrive) - provides deterministic response timing for system reset sequencing. |
Pinout & Package
The MAX6338CUB+ is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height), lead-free compliant, with exposed pad for thermal enhancement. Pin 1 is IN1; pin 5 is GND; pin 10 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 | Fixed-threshold input | Monitors +5.0V supply with −10% trip point (4.25V to 4.50V); internally biased via laser-trimmed divider. |
| IN2 | Fixed-threshold input | Monitors +3.3V supply with −10% trip point (2.85V to 3.00V); no external components required. |
| IN3 | Fixed-threshold input | Monitors +1.8V supply with −10% trip point (1.53V to 1.62V); optimized for low-voltage core rail supervision. |
| IN4 | Adjustable-threshold input | Connects directly to comparator noninverting input; sets trip level using external resistor divider referenced to 1.23V. |
| GND | Analog/digital ground | Common return path for all inputs, reference, and outputs; must be low-impedance for threshold stability. |
| OUT4 | Open-drain output | Active-low signal asserting when IN4 falls below its threshold; pulled up weakly to VCC (10µA). |
| OUT3 | Open-drain output | Active-low signal asserting when IN3 falls below +1.8V −10% threshold; compatible with 1.8V/3.3V logic. |
| OUT2 | Open-drain output | Active-low signal asserting when IN2 falls below +3.3V −10% threshold; supports reset sequencing. |
| OUT1 | Open-drain output | Active-low signal asserting when IN1 falls below +5.0V −10% threshold; used for main supply fault indication. |
| VCC | Power supply input | +2.5V to +5.5V supply; powers internal circuitry and sources internal pull-ups; triggers UVLO below 2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed quad thresholds | Eliminates external resistor networks for +5.0V/−10%, +3.3V/−10%, +1.8V/−10%, and adjustable IN4 - reduces BOM count and layout area. |
| Integrated 1.23V bandgap reference | Provides stable, temperature-compensated reference for all comparators - ensures ±60ppm/°C threshold drift over full operating range. |
| Undervoltage lockout (UVLO) | Forces all outputs low when VCC < 2.5V - guarantees valid reset assertion during power ramp-up or brownout events. |
| Wire-ORable open-drain outputs | Enables single "power good" bus by connecting OUT1–OUT4 together with one external pull-up - simplifies system-level reset arbitration. |
| No external hysteresis required | Built-in 0.3% hysteresis prevents false triggering near threshold - removes need for feedback resistors and associated layout sensitivity. |
Applications
| Desktop Computer Power Sequencing | Telecom Line Card Supervision |
|---|---|
Use Scenario: Monitoring +5V, +3.3V, +1.8V CPU core, and adjustable auxiliary rail in ATX-compatible motherboards. IC Role / Device Role / Timing Role: Quad voltage supervisor providing independent reset signals for each rail, with coordinated assertion timing via propagation delay matching. Use Value: Ensures safe boot sequence by holding processor reset until all rails stabilize within tolerance - prevents latch-up or configuration corruption. |
Use Scenario: Supervising multiple DC-DC converter outputs on a carrier-grade line card with redundant power feeds. IC Role / Device Role / Timing Role: Fault detector generating per-rail fault flags and aggregated "card OK" signal via wire-OR outputs. Use Value: Enables hot-swap capability and field-replaceable unit (FRU) status reporting without adding microcontroller overhead. |
| Industrial PLC I/O Module | Network Storage Controller |
Use Scenario: Monitoring isolated +5V logic, +3.3V FPGA, +1.8V memory, and adjustable analog supply in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: System health monitor interfacing with watchdog timer and diagnostic LED drivers via open-drain outputs. Use Value: Delivers deterministic fault detection under EMI-heavy factory environments - immunity enhanced by internal hysteresis and low ICC noise coupling. |
Use Scenario: Validating +5V backplane, +3.3V controller, +1.8V DDR interface, and adjustable 12V-to-5V intermediate rail in RAID controller boards. IC Role / Device Role / Timing Role: Redundant power-good arbiter feeding into system management controller (SMC) for failover decision logic. Use Value: Supports zero-downtime maintenance by triggering graceful shutdown before data corruption occurs during rail collapse. |
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+ | Same pinout and threshold set (+5.0V/−10%, +3.3V/−10%, +1.8V/−10%, adjustable), but includes manual reset input (MR) and power-fail comparator. | Required where system-level reset initiation or AC power loss detection is needed beyond basic rail monitoring. | Select MAX6339CUB+ if MR or PFI functionality is required; otherwise MAX6338CUB+ offers lower cost and identical supervision capability. |
| TPS3307-33DGNR | Triple monitor only (+3.3V, +5.0V, adjustable), no +1.8V fixed threshold; 3.5µA supply current; different pinout and package (8-pin MSOP). | Suitable for space-constrained designs needing only three rails and ultra-low quiescent current, but requires redesign for fourth rail support. | Choose TPS3307-33DGNR only when reducing component count outweighs loss of +1.8V integration and board rework is acceptable. |
Compared with MAX6339CUB+, the MAX6338CUB+ omits manual reset and power-fail inputs to reduce cost and complexity where those functions are unused; compared with TPS3307-33DGNR, it delivers full quad monitoring in one device with guaranteed +1.8V support - avoiding external circuitry or layout changes.
Availability
MAX6338CUB+ 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-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX6338CUB+ 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, communications, and computing markets.
The MAX6338CUB+ belongs to Maxim's supervisory IC product line, engineered for reliable multirail voltage monitoring in space-constrained, thermally demanding systems where accuracy, low power, and integration are critical.
FAQ
What is the exact threshold voltage for the +1.8V input on MAX6338CUB+?
The +1.8V input (IN3) on MAX6338CUB+ has a −10% factory-trimmed threshold ranging from 1.53V to 1.62V, with typical value 1.58V at +25°C. This specification is guaranteed over the full −40°C to +85°C operating range and does not require external calibration. The MAX6338CUB+ achieves this using laser-trimmed internal resistor dividers referenced to the 1.23V bandgap.
Can MAX6338CUB+ monitor negative voltages like −5.0V?
No, MAX6338CUB+ cannot monitor −5.0V. Its IN1–IN3 pins are factory-programmed for +5.0V, +3.3V, and +1.8V only. While the MAX6338 family includes variants like MAX6338MUB that support −5.0V on IN4, the MAX6338CUB+ configures IN4 as an adjustable positive-input comparator with 1.23V reference - unsuitable for negative rail sensing. Use MAX6338MUB+ or MAX6338NUB+ for −5.0V monitoring.
Does MAX6338CUB+ require external pull-up resistors on its outputs?
MAX6338CUB+ includes weak 10µA internal pull-ups to VCC on all four outputs (OUT1–OUT4), so external pull-ups are optional. However, external pull-ups may be added to override the internal ones - for example, to interface with 1.8V logic or to increase sink current capability. The internal pull-ups remain active unless overdriven; no damage occurs when external pull-ups connect to voltages from 0V to +5.5V.
How does the undervoltage lockout (UVLO) function in MAX6338CUB+?
The MAX6338CUB+ UVLO circuit monitors VCC and forces all four outputs low whenever VCC drops below 2.5V. This behavior persists down to VCC = 1V, ensuring consistent reset assertion during brownout or power-down sequences. UVLO is fully internal - no external components or enable pins are involved. The MAX6338CUB+ resumes normal monitoring only after VCC rises above 2.5V and stabilizes.
Is MAX6338CUB+ pin-compatible with other MAX6338 variants like MAX6338AUB+?
Yes, all MAX6338 variants including MAX6338CUB+ share identical 10-pin µMAX package, pinout, and electrical interface - they differ only in factory-programmed threshold configurations. A design using MAX6338AUB+ can substitute MAX6338CUB+ without PCB changes, provided the new threshold set (+5.0V/−10%, +3.3V/−10%, +1.8V/−10%, adjustable) meets system requirements.
MAX6338CUB+ 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:
- 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+ FAQ
1.How can I place an order for MAX6338CUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6338CUB+ 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+ reliable?
The price and inventory of MAX6338CUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6338CUB+ is usually 5 days.
3.What payment methods are accepted for MAX6338CUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6338CUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6338CUB+?
MAX6338CUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6338CUB+ 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+?
For technical support, including MAX6338CUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6338CUB+ requirements.
6.How does Aetrix verify that MAX6338CUB+ is sourced from the original manufacturer or authorized distributors?
All MAX6338CUB+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6338CUB+?
All MAX6338CUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6338CUB+, 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+ part is unused and in its original packaging.
Return procedure for MAX6338CUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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