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Analog Devices Inc./Maxim Integrated MAX6392KA26
- Part No.:
- MAX6392KA26
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6392KA26.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,160
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Product details
Overview
MAX6392KA26 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with sequenced reset outputs for multi-rail systems. It monitors VCC (master supply) at 2.63V ±0.075V threshold and RESET IN2 (secondary supply) down to 625mV, provides push-pull RESET1 and open-drain RESET2 with 140ms minimum timeout, and includes active-low manual reset (MR) - used in industrial controllers and multivoltage servers requiring controlled power-up sequencing.
For engineers reviewing the MAX6392KA26 datasheet, MAX6392KA26 pinout, MAX6392KA26 application, or MAX6392KA26 equivalent, key selection considerations include its fixed 2.63V VCC reset threshold, MR-triggered dual-reset assertion timing, CSRT-configurable RESET2 delay, guaranteed reset validity down to VCC = 1V, and immunity to sub-100ns VCC transients.
Technical Context
The MAX6392KA26 implements two independent voltage monitoring paths: a factory-trimmed bandgap comparator for VCC (2.63V threshold) and a precision 625mV reference comparator for RESET IN2. RESET1 is push-pull and deasserts ≥140ms after VCC exceeds threshold; RESET2 is open-drain and deasserts ≥140ms (or user-adjustable via CSRT capacitor) after both VCC and RESET IN2 exceed thresholds - with strict sequencing enforced (RESET2 always deasserts after RESET1 on power-up, asserts before RESET1 on power-down).
Its internal 47kΩ MR pullup and RESET2 pullup resistor (R2), combined with 15µA typical supply current and operation down to VCC = 1V, enable low-power, robust brownout detection in space-constrained embedded systems without external biasing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.63V (factory-fixed, ±0.075V tolerance) - sets precise power-on reset point for primary supply |
| RESET IN2 Threshold | 625mV (internal reference) - enables monitoring of secondary rails as low as 0.625V via external divider |
| RESET1 Timeout | 140ms minimum - ensures stable µP initialization before release of primary reset |
| RESET2 Timeout | 140ms minimum or capacitor-adjustable - supports flexible sequencing between master/slave subsystems |
| Supply Current | 15µA typical - enables use in battery-backed or ultra-low-power monitoring applications |
| Reset Valid Down To | VCC = 1V - guarantees reliable reset assertion during deep brownout conditions |
| MR Input Pulse Width | 50µs minimum - allows clean manual reset triggering with short, noise-immune button presses |
Pinout & Package
MAX6392KA26 is housed in an 8-pin SOT23 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch), rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN2 | Secondary supply monitor input | High-impedance node for external resistive divider; triggers RESET2 when voltage falls below 625mV |
| 2 - VCC | Main supply and master reset reference | Power source and primary voltage monitor; all resets assert if VCC drops below 2.63V |
| 3 - CSRT | RESET2 timeout configuration terminal | Connect to VCC for fixed 140ms delay or to external capacitor for user-adjustable timeout (e.g., 3.1ms with 1500pF) |
| 4 - GND | Analog/digital ground reference | Common return path for all internal comparators, timers, and output drivers |
| 5 - RESET2 | Secondary active-low reset output | Open-drain output asserted when VCC < 2.63V or RESET IN2 < 625mV; sequenced after RESET1 |
| 6 - R2 | Internal pullup connection for RESET2 | 47kΩ resistor tied internally to RESET2; connect to external VOH rail for level-shifted high-state drive |
| 7 - RESET1 | Primary active-low reset output | Push-pull output asserted when VCC < 2.63V; deasserts ≥140ms after VCC recovery |
| 8 - MR | Active-low manual reset input | Internally pulled up to VCC via 47kΩ; forces both RESET1 and RESET2 low when driven low |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC (2.63V) and secondary rail (625mV ref) enables true multivoltage system control |
| Guaranteed reset validity to 1V | Ensures fail-safe reset assertion even during severe brownout - critical for nonvolatile memory and state retention |
| Sequenced reset timing enforcement | Hardware-enforced RESET2-before-RESET1 assertion on power-down and RESET1-before-RESET2 deassertion on power-up |
| Integrated MR with glitch rejection | 100ns glitch filter and 50µs minimum pulse width prevent spurious resets from noisy switch inputs |
| No external pullups required | On-chip 47kΩ pullups for MR and R2 eliminate BOM cost and board space for basic configurations |
Applications
| Industrial PLC Controllers | Servers with Dual-Core CPUs |
|---|---|
Use Scenario: Monitoring 3.3V I/O rail and 1.8V core rail in programmable logic controllers operating in harsh environments. IC Role / Device Role / Timing Role: Primary supervisor enforcing power-up sequence where FPGA config completes before CPU boot. Use Value: Prevents metastability and bus contention by ensuring 3.3V rail stabilizes and releases RESET1 before 1.8V rail releases RESET2. | Use Scenario: Coordinating reset timing between main CPU and co-processor in rack-mounted servers with separate voltage domains. IC Role / Device Role / Timing Role: Dual-reset generator with MR support for field-serviceable warm reboots without full power cycle. Use Value: Enables deterministic restart of compute and management subsystems using single MR button while maintaining sequencing integrity. |
| Medical Diagnostic Equipment | Automated Test Equipment (ATE) |
Use Scenario: Supervising analog front-end (2.5V) and digital processing (1.2V) supplies in portable ultrasound units. IC Role / Device Role / Timing Role: Brownout detector with 1V valid reset guarantee to preserve ADC calibration data during transient dips. Use Value: Maintains system safety by asserting RESET2 within 10µs of secondary rail failure while keeping primary reset active until full recovery. | Use Scenario: Ensuring synchronized startup of FPGA-based pattern generators and DAC/ADC signal chains in benchtop ATE. IC Role / Device Role / Timing Role: Sequenced reset controller with capacitor-adjustable RESET2 delay to match FPGA configuration time. Use Value: Eliminates need for discrete RC networks by allowing precise tuning of RESET2 delay (e.g., 3.1ms with 1500pF) to match bitstream load duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6392KA29 | VCC reset threshold = 2.93V (vs. 2.63V); otherwise identical pinout, timing, and feature set | Used where higher primary rail reset point is required (e.g., 3.0V systems with tighter margin) | Select MAX6392KA29 only if system VCC nominal is ≥2.9V and 2.63V threshold risks premature reset assertion |
| TPS3808G33 | Single-supply monitor (3.3V fixed threshold), no secondary input or sequenced outputs; SOT23-6 package | Suitable for simpler single-rail systems but cannot replace dual-monitoring or sequencing functionality | Choose TPS3808G33 only for cost-sensitive, single-voltage designs where RESET2 sequencing is unnecessary |
Compared with MAX6392KA26, MAX6392KA29 offers a higher VCC reset point for tighter 3V-system margins, while TPS3808G33 provides lower-cost single-rail supervision but lacks RESET IN2 monitoring, MR input, and hardware-enforced sequencing - making it unsuitable for true dual-voltage coordination.
Availability
MAX6392KA26 is available at Aetrix Electronics and suitable for industrial controllers, server power management, medical diagnostics, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for MAX6392KA26 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 industrial, automotive, and communications applications.
The MAX6391/MAX6392 product line delivers integrated dual-supply supervision with hardware-enforced reset sequencing - specifically engineered for reliability-critical embedded systems needing coordinated power-up/down of heterogeneous voltage domains.
FAQ
What is the exact VCC reset threshold voltage for MAX6392KA26?
The MAX6392KA26 has a factory-trimmed VCC reset threshold of 2.63V, with a guaranteed range of 2.55V to 2.70V across the -40°C to +85°C temperature range. This value is laser-trimmed during production and is specific to the KA26 suffix - confirmed in the Electrical Characteristics table under "VCC Reset Threshold (VTH1)".
Does MAX6392KA26 support adjustable RESET2 timeout, and how is it configured?
Yes, MAX6392KA26 supports user-adjustable RESET2 timeout via the CSRT pin. Connecting an external capacitor from CSRT to ground sets the delay using the formula tRP2 ≈ 2.08 × 10⁶ × CCSRT (e.g., 3.1ms with 1500pF). Alternatively, tying CSRT to VCC selects the fixed 140ms minimum timeout - both modes are fully supported and validated in the MAX6392KA26 datasheet.
How does the manual reset (MR) function in MAX6392KA26?
The MR input in MAX6392KA26 is an active-low, glitch-filtered (100ns) signal with internal 47kΩ pullup to VCC. Driving MR low forces both RESET1 (push-pull) and RESET2 (open-drain) active simultaneously. RESET1 remains asserted for its full 140ms timeout after MR returns high, while RESET2 follows its configured timeout (fixed or capacitor-adjustable) - ensuring coordinated reset release per the device's sequencing architecture.
Can MAX6392KA26 monitor a 1.2V supply as the secondary rail?
Yes, MAX6392KA26 can monitor a 1.2V supply on RESET IN2 using an external resistive divider. With its internal 625mV reference, a standard divider (e.g., R3 = 450kΩ, R4 = 500kΩ) scales 1.2V down to ~625mV at the pin. The MAX6392KA26 datasheet explicitly specifies this method in the "Monitoring Voltages Other Than VCC" section and confirms 625mV threshold accuracy over temperature.
Is MAX6392KA26 compatible with lead-free PCB assembly processes?
Yes, MAX6392KA26 is available in lead-free packaging. Per the Ordering Information section, lead-free versions are designated by replacing the "-T" suffix with "+T" (e.g., MAX6392KA26+T), and the device meets JEDEC MO-178 standards for SOT23-8 packages. Its maximum solder temperature rating is +300°C for 10 seconds, fully compliant with standard lead-free reflow profiles.
MAX6392KA26 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V, Adj
- Output:
- Open Drain, Push-Pull
- Reset:
- Active Low
- Reset Timeout:
- 140ms/Adjustable Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6392KA26 FAQ
1.How can I place an order for MAX6392KA26 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6392KA26 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 MAX6392KA26 reliable?
The price and inventory of MAX6392KA26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6392KA26 is usually 5 days.
3.What payment methods are accepted for MAX6392KA26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6392KA26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6392KA26?
MAX6392KA26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6392KA26 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 MAX6392KA26?
For technical support, including MAX6392KA26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6392KA26 requirements.
6.How does Aetrix verify that MAX6392KA26 is sourced from the original manufacturer or authorized distributors?
All MAX6392KA26 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 MAX6392KA26 meets industry standards.
7.What is the process for return or replacement of MAX6392KA26?
All MAX6392KA26 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6392KA26, 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 MAX6392KA26 part is unused and in its original packaging.
Return procedure for MAX6392KA26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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