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Analog Devices Inc./Maxim Integrated MAX6391KA22-T
- Part No.:
- MAX6391KA22-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6391KA22-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6391KA22-T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with sequenced open-drain reset outputs, monitoring VCC (2.19V factory-fixed threshold) and RESET IN2 (adjustable down to 625mV), providing guaranteed reset validity down to VCC = 1V, 140ms minimum RESET1 timeout, and 15µA typical supply current for multivoltage power sequencing in embedded controllers.
For engineers reviewing the MAX6391KA22-T datasheet, MAX6391KA22-T pinout, MAX6391KA22-T application, or MAX6391KA22-T equivalent, this device supports precise power-up ordering between master and slave supplies, offers capacitor-adjustable or fixed RESET2 timing, integrates internal 47kΩ pullup resistors on both reset outputs, and operates reliably across -40°C to +85°C in space-constrained SOT23-8 systems.
Technical Context
The MAX6391KA22-T implements two independent voltage comparators: one monitors VCC against a factory-trimmed 2.19V threshold (VTH1), asserting RESET1; the other compares RESET IN2 against a fixed 625mV internal reference (VTH2), enabling secondary supply monitoring. RESET1 deasserts ≥140ms after VCC exceeds VTH1, while RESET2 deasserts either ≥140ms after both VCC and RESET IN2 exceed their thresholds-or after a user-defined delay set by CSRT capacitor-ensuring strict power-up sequence control.
RESET2 always deasserts after RESET1 during power-up and asserts before RESET1 during power-down, enforcing deterministic sequencing. The device uses BiCMOS process (810 transistors), guarantees operation down to VCC = 1V, and features immunity to short negative VCC transients via comparator overdrive filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.19V (factory-trimmed, ±0.07V tolerance); sets precise brownout detection point for primary supply |
| RESET IN2 Threshold | 625mV (fixed internal reference); enables monitoring of secondary supplies as low as 625mV via external resistor divider |
| RESET1 Timeout | 140ms minimum; ensures stable processor initialization before release of primary reset signal |
| RESET2 Timeout | 140ms minimum or capacitor-adjustable (via CSRT pin); supports flexible sequencing for slave processors or peripherals |
| Supply Current | 15µA typical; minimizes quiescent power draw in battery-backed or energy-sensitive systems |
| Operating Temperature | -40°C to +85°C; qualified for industrial and extended-temperature embedded applications |
| Reset Validity Voltage | VCC ≥ 1.0V; guarantees functional reset assertion even during deep brownout conditions |
Pinout & Package
MAX6391KA22-T is housed in an 8-pin SOT23 package (JEDEC MO178 compliant), measuring 3.00mm × 1.75mm × 1.30mm, with gull-wing leads and 0.65mm pitch. Pin 1 marked by dot; lead coplanarity ≤ 0.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN2 | Secondary supply monitor input | High-impedance comparator input referenced to 625mV; connects to external resistor divider for custom threshold setting |
| 2 - VCC | Main supply and master reset monitor | Power supply input and primary voltage sense node; triggers both resets when falling below 2.19V |
| 3 - CSRT | RESET2 timeout configuration | Connect to VCC for fixed 140ms RESET2 delay or to external capacitor for user-adjustable timing (2.08×10⁶ × C seconds) |
| 4 - GND | Analog/digital ground reference | Common return path for all internal comparators, timers, and output drivers |
| 5 - RESET2 | Secondary open-drain reset output | Active-low, open-drain output; requires external pullup or internal R2 (47kΩ) connected to desired VOH rail |
| 6 - R2 | Internal pullup connection for RESET2 | 47kΩ resistor tied internally to RESET2; connect to external voltage to set RESET2 high-level drive independently |
| 7 - RESET1 | Primary open-drain reset output | Active-low, open-drain output; deasserts ≥140ms after VCC recovery; timing is fully internal and unadjustable |
| 8 - R1 | Internal pullup connection for RESET1 | 47kΩ resistor tied internally to RESET1; connect to external voltage to set RESET1 high-level drive independently |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | VCC (2.19V fixed) and RESET IN2 (625mV reference) enable simultaneous tracking of master and slave rails without cross-coupling |
| Guaranteed reset validity at low VCC | Functional reset assertion supported down to VCC = 1.0V, critical for brownout resilience in low-voltage systems |
| Sequenced reset timing control | RESET2 always asserts before RESET1 on power-down and deasserts after RESET1 on power-up-enforcing strict hardware sequencing |
| Integrated pullup resistors | 47kΩ internal R1/R2 resistors eliminate need for external pullups unless higher VOH or faster rise time required |
| Transient immunity | Immunity to short negative VCC glitches (≤100ns at 10mV overdrive), reducing false resets in noisy power environments |
Applications
| Industrial PLC Controllers | Embedded Multivoltage Systems |
|---|---|
Use Scenario: Programmable logic controller with separate 3.3V I/O and 1.8V FPGA core supplies requiring coordinated power sequencing. IC Role / Device Role / Timing Role: Supervisory IC enforcing RESET1 assertion on 3.3V rail first, followed by RESET2 on 1.8V rail only after 3.3V stabilizes-preventing FPGA configuration errors. Use Value: Eliminates risk of partial initialization due to out-of-order power-up; no external timing components needed beyond CSRT capacitor. | Use Scenario: Low-power sensor node with 2.5V MCU and 1.2V analog front-end, where brownout must trigger full system reset before VCC drops below 1.0V. IC Role / Device Role / Timing Role: Dual-threshold supervisor detecting both main supply collapse (2.19V) and auxiliary rail failure (via 625mV reference + divider), asserting resets with guaranteed validity down to 1.0V. Use Value: Ensures deterministic reset under deep brownout-critical for data integrity in battery-operated edge devices. |
| Network Equipment Power Management | Medical Diagnostic Instrumentation |
Use Scenario: Gigabit Ethernet switch ASIC powered by 1.0V core and 3.3V interface rails, requiring strict power-down order to avoid latch-up. IC Role / Device Role / Timing Role: Sequencing supervisor ensuring RESET2 (core) asserts before RESET1 (I/O) during power-down, preventing bus contention or state corruption. Use Value: Enforces safe power-down sequence without firmware intervention-reducing BOM count and improving field reliability. | Use Scenario: Portable ultrasound device with isolated 5V analog supply and 1.5V digital processing rail, needing fail-safe reset coordination under EMI-rich clinical environments. IC Role / Device Role / Timing Role: Immune-to-glitch supervisor rejecting sub-100ns VCC transients while asserting synchronized resets across isolated domains using internal pullups. Use Value: Prevents spurious resets during RF interference events-meeting IEC 60601-1 immunity requirements without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6392KA22-T | Includes active-low manual reset (MR) input and push-pull RESET1; lacks R1 pullup resistor | Required where hardware-initiated reset (e.g., front-panel button) or stronger RESET1 drive is needed | Select MAX6392KA22-T if manual reset functionality or push-pull RESET1 is mandatory; otherwise MAX6391KA22-T reduces component count |
| TPS3808G33DBVR | Single-supply supervisor (3.3V fixed threshold); no secondary supply monitor or sequenced outputs | Suitable only for single-rail systems; cannot replace dual-monitoring or sequencing function of MAX6391KA22-T | Use TPS3808G33DBVR only for basic 3.3V reset; not a functional substitute for MAX6391KA22-T's dual-rail sequencing capability |
Compared with MAX6392KA22-T, the MAX6391KA22-T omits MR and retains dual internal pullups-ideal for cost-sensitive, space-constrained designs without manual reset needs. Versus TPS3808G33DBVR, it provides unique dual-threshold monitoring and enforced sequencing, making it irreplaceable in multivoltage systems requiring hardware-enforced power order.
Availability
MAX6391KA22-T is available at Aetrix Electronics and suitable for industrial PLC controllers, embedded multivoltage systems, and network equipment power management requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6391KA22-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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.
The MAX6391/MAX6392 product line was designed specifically for deterministic power sequencing in dual-rail microprocessor systems-addressing reliability gaps left by discrete reset solutions or single-supply supervisors.
FAQ
What is the factory-set VCC reset threshold voltage for MAX6391KA22-T?
The MAX6391KA22-T has a factory-trimmed VCC reset threshold of 2.19V, with a tolerance of ±0.07V (min/max 2.12V to 2.25V). This value is laser-trimmed during production and is specific to the KA22 variant-confirmed in the Selector Guide and Electrical Characteristics table. The MAX6391KA22-T uses this fixed threshold to assert RESET1 whenever VCC falls below 2.19V, ensuring consistent brownout detection across units.
Can MAX6391KA22-T monitor a 1.2V supply as the secondary voltage?
Yes, the MAX6391KA22-T can monitor a 1.2V supply on RESET IN2 using an external resistor divider. Since its internal reference is fixed at 625mV, a divider with R3 = 470kΩ and R4 = 500kΩ yields VRST ≈ 1.2V. The MAX6391KA22-T's high-impedance input draws only 50nA, minimizing divider current. This configuration allows reliable secondary supply monitoring down to 625mV-verified in Applications Information section.
How is the RESET2 timeout period configured on MAX6391KA22-T?
The RESET2 timeout on MAX6391KA22-T is configured via the CSRT pin: connecting CSRT to VCC selects a fixed 140ms (minimum) delay, while connecting CSRT to an external capacitor (e.g., 1500pF) enables user-adjustable timing per tRP2 = 2.08×10⁶ × CCSRT seconds. The MAX6391KA22-T's internal 600nA current source and 1.25V comparator reference implement this function-detailed in the Applications Information and Electrical Characteristics tables.
Does MAX6391KA22-T support operation below 1.8V VCC?
Yes, the MAX6391KA22-T guarantees functional reset assertion down to VCC = 1.0V, as explicitly stated in the Features list and Electrical Characteristics table. It remains operational across the full 1.2V to 5.5V VCC range, with reset outputs valid and timing specifications maintained. This capability makes the MAX6391KA22-T suitable for ultra-low-voltage applications such as battery-powered IoT nodes where supply may sag near 1.0V during peak load.
What package type and lead finish does MAX6391KA22-T use?
The MAX6391KA22-T uses an 8-pin SOT23 package (JEDEC MO178 compliant), with dimensions 3.00mm × 1.75mm × 1.30mm and 0.65mm lead pitch. It is available in lead-free packaging-indicated by the "-T" suffix-and requires tape-and-reel delivery with a 2,500-unit minimum order quantity. The package drawing and mechanical specs are documented in the Package Information section of the datasheet.
MAX6391KA22-T 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:
- 2.19V, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6391KA22-T FAQ
1.How can I place an order for MAX6391KA22-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6391KA22-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 MAX6391KA22-T reliable?
The price and inventory of MAX6391KA22-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6391KA22-T is usually 5 days.
3.What payment methods are accepted for MAX6391KA22-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6391KA22-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6391KA22-T?
MAX6391KA22-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6391KA22-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 MAX6391KA22-T?
For technical support, including MAX6391KA22-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6391KA22-T requirements.
6.How does Aetrix verify that MAX6391KA22-T is sourced from the original manufacturer or authorized distributors?
All MAX6391KA22-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 MAX6391KA22-T meets industry standards.
7.What is the process for return or replacement of MAX6391KA22-T?
All MAX6391KA22-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6391KA22-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 MAX6391KA22-T part is unused and in its original packaging.
Return procedure for MAX6391KA22-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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