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Analog Devices Inc./Maxim Integrated MAX6392KA22+T
- Part No.:
- MAX6392KA22+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6392KA22+T.pdf
- Description:
- IC SUPERVISOR MPU DL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,767
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Product details
Overview
MAX6392KA22+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with sequenced reset outputs, monitoring VCC (2.19V factory-fixed threshold) and RESET IN2 (adjustable down to 625mV), providing push-pull RESET1 and open-drain RESET2 with 140ms minimum timeout periods, and featuring active-low manual reset (MR) for system-level reset control in multivoltage power-up sequencing applications.
For engineers reviewing the MAX6392KA22+T datasheet, MAX6392KA22+T pinout, MAX6392KA22+T application, or MAX6392KA22+T equivalent, this device supports precise voltage monitoring, time-sequenced reset assertion/deassertion, MR-triggered synchronous reset, low-quiescent-current operation (15µA typical), and guaranteed reset validity down to VCC = 1V - critical for reliable boot in industrial controllers and embedded systems.
Technical Context
The MAX6392KA22+T implements two independent voltage comparators: one fixed-threshold (2.19V) monitor on VCC driving RESET1, and a 625mV reference-based comparator on RESET IN2 driving RESET2. RESET2 asserts whenever either VCC or RESET IN2 falls below its respective threshold, and deasserts only after both recover and RESET1 has deasserted - enforcing strict power-up order.
Its internal architecture includes a 600nA current source for CSRT-based timeout adjustment, a 47kΩ internal pullup on MR, and separate timing chains for fixed (140ms min) and capacitor-adjustable RESET2 delays. The push-pull RESET1 output eliminates external pullup requirements for that signal, while RESET2 remains open-drain with internal R2 pullup option.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.19V (factory-fixed, ±0.07V tolerance) - ensures deterministic reset initiation at precisely defined supply level |
| RESET IN2 Threshold | 625mV (internal reference, ±15mV) - enables monitoring of auxiliary supplies as low as 625mV via external resistor divider |
| RESET1 Timeout | 140ms minimum - guarantees stable processor hold time after VCC rise, eliminating need for external timing components |
| RESET2 Timeout | 140ms minimum (CSRT tied to VCC) or user-adjustable (CSRT to capacitor) - provides flexible sequencing window for secondary subsystems |
| Supply Current | 15µA typical - minimizes standby power impact in battery-backed or energy-sensitive systems |
| Reset Validity Range | VCC ≥ 1.0V - ensures functional reset generation even during deep brownout conditions |
| MR Input Pulse Width | 50µs minimum - supports clean manual reset triggering without susceptibility to noise or contact bounce |
Pinout & Package
MAX6392KA22+T is housed in an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch), lead-free, RoHS-compliant, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN2 | Secondary supply monitor input | High-impedance comparator input referenced to 625mV; accepts divided-down voltage for custom reset thresholds |
| 2 - VCC | Main supply and master reset source | Power supply input and primary voltage monitor; all resets assert when VCC drops below 2.19V |
| 3 - CSRT | RESET2 timeout configuration node | Connect to VCC for fixed 140ms delay or to external capacitor for user-adjustable timeout (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 active-low reset output | Open-drain output asserted before RESET1 on power-down and deasserted after RESET1 on power-up; requires external pullup unless using R2 |
| 6 - R2 | Internal pullup connection for RESET2 | 47kΩ resistor internally connected to RESET2; tie to desired VOH voltage (e.g., 3.3V or 5V) for level-shifted high-state drive |
| 7 - RESET1 | Primary active-low reset output | Push-pull output (unlike MAX6391's open-drain); drives LOW actively and HIGH actively - no external pullup needed |
| 8 - MR | Active-low manual reset input | Internally pulled up to VCC via 47kΩ; pulling LOW forces simultaneous assertion of RESET1 and RESET2 for controlled system reset |
Key Features
| Feature | Design Value |
|---|---|
| Sequenced reset assertion/deassertion | Guarantees RESET2 asserts before RESET1 on power-down and deasserts after RESET1 on power-up - enforces safe multi-rail power sequencing |
| Manual reset with synchronized timing | MR input triggers both RESET1 and RESET2 simultaneously, with RESET2 leading by 100ns - prevents race conditions during forced reset |
| Dual-supply monitoring with independent thresholds | VCC monitored at 2.19V (±0.07V), RESET IN2 referenced to 625mV (±15mV) - supports asymmetric rail monitoring (e.g., 3.3V + 1.8V systems) |
| Low-power supervision | 15µA typical ICC enables use in always-on monitoring circuits without significant battery drain |
| Brownout immunity | Valid reset operation down to VCC = 1.0V and immunity to <100ns negative transients - improves robustness against supply glitches |
Applications
| Industrial PLC Controllers | Embedded Edge Gateways |
|---|---|
|
Use Scenario: Powering up a dual-rail controller with 3.3V I/O and 1.8V core, requiring strict sequencing to avoid latch-up. IC Role / Device Role / Timing Role: MAX6392KA22+T acts as the central sequencer - asserting RESET2 on 1.8V rail first, then releasing RESET1 only after 140ms to enable 3.3V peripherals. Use Value: Eliminates discrete RC timing networks and reduces BOM count by integrating dual monitoring, manual reset, and push-pull drive in one 8-pin SOT23. |
Use Scenario: Remote IoT gateway with battery backup, needing reliable cold-start and brownout recovery across 5V USB, 3.3V MCU, and 1.2V RF module rails. IC Role / Device Role / Timing Role: MAX6392KA22+T monitors main 5V supply (VCC) and scaled 1.2V rail (via RESET IN2 divider), asserting resets in priority order and enabling MR-triggered firmware recovery. Use Value: 15µA quiescent current extends battery life; guaranteed reset validity to 1V ensures operation during gradual discharge; MR pin allows OTA-initiated hard reset. |
| Network Print Servers | Ruggedized Medical Data Loggers |
|
Use Scenario: Multi-chip print server board with Ethernet PHY, ARM SoC, and flash memory, each requiring staggered reset release. IC Role / Device Role / Timing Role: MAX6392KA22+T generates RESET1 for SoC (after 140ms stabilization) and RESET2 for PHY (delayed further via CSRT capacitor), preventing bus contention. Use Value: Adjustable RESET2 timeout replaces multiple discrete supervisors; push-pull RESET1 simplifies SoC interface; SOT23-8 saves PCB area vs. SOIC alternatives. |
Use Scenario: Portable medical logger operating from coin cell and USB, where power interruptions must not corrupt stored patient data. IC Role / Device Role / Timing Role: MAX6392KA22+T monitors main 3.3V rail (VCC) and backup 1.8V SRAM supply (RESET IN2), asserting RESET2 to freeze memory writes before RESET1 halts CPU - preserving data integrity. Use Value: Immunity to short VCC transients prevents spurious resets during ESD events; -40°C to +85°C rating ensures field reliability; MR pin supports clinician-initiated reset without opening enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6392KA23+T | VCC threshold = 2.32V (vs. 2.19V); otherwise identical pinout, timing, and features | Suitable where higher VCC trip point is required to accommodate wider supply tolerance or higher nominal rail | Select MAX6392KA23+T only if system VCC variation exceeds ±3% around 2.19V and 2.32V better fits margin analysis |
| TPS3808G33DBVR | Single-supply monitor (3.3V fixed), no secondary input or sequenced outputs; SOT23-6 package | Lacks RESET IN2 monitoring and RESET2 sequencing - cannot replace MAX6392KA22+T in dual-rail sequencing roles | Use only for single-rail applications where sequenced dual-reset is unnecessary; requires redesign for dual-supply use |
Compared with MAX6392KA23+T, the MAX6392KA22+T offers tighter alignment with 2.2V nominal rails and lower trip margin; compared with TPS3808G33DBVR, it delivers essential dual-input supervision and enforced reset ordering - making it irreplaceable in multivoltage sequencing without adding discrete logic or second IC.
Availability
MAX6392KA22+T is available at Aetrix Electronics and suitable for industrial PLC controllers, embedded edge gateways, network print servers, ruggedized medical data loggers, and multivoltage monitoring systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for MAX6392KA22+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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.
The MAX6391/MAX6392 product line delivers integrated dual-supply supervisory circuits with sequenced reset outputs, targeting systems requiring deterministic power-up/down sequencing, manual reset capability, and minimal external components - especially in space-constrained embedded designs.
FAQ
What is the exact VCC reset threshold voltage for MAX6392KA22+T?
The MAX6392KA22+T has a factory-trimmed VCC reset threshold of 2.19V, with a guaranteed tolerance of ±0.07V over the full -40°C to +85°C temperature range. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold (VTH1)" for the KA22 suffix, and is laser-trimmed during production - not adjustable in-circuit.
Does MAX6392KA22+T support adjustable RESET2 timeout, and how is it implemented?
Yes, MAX6392KA22+T supports user-adjustable RESET2 timeout via the CSRT pin. Connecting an external capacitor from CSRT to ground enables timing based on a 600nA internal current source and 1.25V reference, yielding tRP2 = 2.08 × 10⁶ × CCSRT seconds. For example, a 1500pF capacitor gives ~3.1ms. Tying CSRT to VCC selects the fixed 140ms minimum timeout.
How does the manual reset (MR) function interact with the automatic reset timing in MAX6392KA22+T?
When MR is pulled low, MAX6392KA22+T immediately asserts both RESET1 (push-pull) and RESET2 (open-drain) regardless of VCC or RESET IN2 status. RESET1 remains asserted for its full 140ms timeout after MR returns high, and RESET2 follows its configured timeout (fixed or capacitor-adjusted) - ensuring synchronized, glitch-free manual reset with predictable hold time.
Can MAX6392KA22+T monitor a 1.2V supply directly, and what is required?
MAX6392KA22+T cannot monitor 1.2V directly on RESET IN2 because its internal reference is fixed at 625mV. To monitor a 1.2V rail, connect it to RESET IN2 through an external resistive divider (e.g., R3 = 470kΩ, R4 = 500kΩ) so that 1.2V produces exactly 625mV at the pin - satisfying the comparator threshold while minimizing current draw.
What is the maximum supply voltage range supported by MAX6392KA22+T, and is operation at 1.2V valid?
MAX6392KA22+T operates over VCC = 1.2V to 5.5V per Absolute Maximum Ratings and Electrical Characteristics. Crucially, reset functionality remains guaranteed down to VCC = 1.0V - meaning the device continues to generate valid reset signals even as supply sags below 1.2V, supporting robust brownout detection in low-voltage systems.
MAX6392KA22+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, 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
MAX6392KA22+T FAQ
1.How can I place an order for MAX6392KA22+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6392KA22+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 MAX6392KA22+T reliable?
The price and inventory of MAX6392KA22+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6392KA22+T is usually 5 days.
3.What payment methods are accepted for MAX6392KA22+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6392KA22+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6392KA22+T?
MAX6392KA22+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6392KA22+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 MAX6392KA22+T?
For technical support, including MAX6392KA22+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6392KA22+T requirements.
6.How does Aetrix verify that MAX6392KA22+T is sourced from the original manufacturer or authorized distributors?
All MAX6392KA22+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 MAX6392KA22+T meets industry standards.
7.What is the process for return or replacement of MAX6392KA22+T?
All MAX6392KA22+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6392KA22+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 MAX6392KA22+T part is unused and in its original packaging.
Return procedure for MAX6392KA22+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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