My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6392KA22+
- Part No.:
- MAX6392KA22+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6392KA22+.pdf
- Description:
- POWER SUPPLY SUPPORT CIRCUIT, FI
- Quantity:
- Payment:
- Shipping:
Inventory:529
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6392KA22+ from Maxim Integrated is a dual-voltage microprocessor supervisory IC that monitors VCC (master supply) and RESET IN2 (adjustable secondary supply) to generate time-sequenced active-low reset outputs: push-pull RESET1 and open-drain RESET2. It features a factory-set 2.19V VCC reset threshold, guaranteed reset validity down to VCC = 1.0V, 140ms minimum timeout for both resets, and an active-low manual reset (MR) input. It is used in multivoltage systems requiring controlled power-up sequencing - e.g., dual-core processors with independent I/O and core rails.
For engineers reviewing the MAX6392KA22+ datasheet, MAX6392KA22+ pinout, MAX6392KA22+ application, or MAX6392KA22+ equivalent, this page delivers verified electrical parameters, sequenced reset timing behavior, MR input timing specs, SOT23-8 package details, and real-world multivoltage monitoring use cases - all confirmed from Maxim's official datasheet Rev 2 (12/05).
Technical Context
The MAX6392KA22+ implements two independent voltage comparators: one fixed-threshold comparator for VCC (2.19V ±0.07V), and one 625mV reference comparator for RESET IN2, enabling user-adjustable secondary supply monitoring via external resistor divider. RESET1 is push-pull and asserts synchronously with VCC drop; RESET2 is open-drain and asserts if either VCC or RESET IN2 falls below threshold.
Sequencing is enforced by internal timing logic: RESET2 deasserts only after RESET1 has deasserted, and during power-down, RESET2 asserts before RESET1. The CSRT pin supports either fixed 140ms (min) timeout (when tied to VCC) or capacitor-adjustable delay (via 600nA current source charging CCSRT to 1.25V reference).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.19V (factory-fixed, ±0.07V over -40°C to +85°C); ensures reliable reset assertion when main supply drops below safe operating level for 2.2V–2.5V logic domains. |
| RESET IN2 Threshold | 625mV (internal reference); enables monitoring of secondary supplies as low as 625mV using external resistive divider - e.g., 1.2V rail with 2:1 divider yields 600mV trip point. |
| RESET1 Timeout | 140ms (min), 200ms (typ), 280ms (max); fixed internal timer guarantees sufficient hold time for processor initialization before release. |
| RESET2 Timeout | 140ms (min) fixed when CSRT = VCC; or user-adjustable (e.g., 3.1ms with 1500pF) when CSRT = capacitor; provides flexibility for fast- or slow-release secondary subsystems. |
| Supply Current | 15µA (typ), 25µA (max) at +25°C; ultra-low quiescent current enables use in battery-backed or always-on monitoring circuits without significant drain. |
| Reset Valid Down To | VCC = 1.0V; allows full reset functionality even during deep brownout conditions where many supervisors fail - critical for robust industrial power management. |
| MR Input Pulse Width | 50µs (min); supports clean manual reset triggering from debounced pushbuttons or digital control signals without false triggers. |
Pinout & Package
Package: 8-pin SOT23-8 (JEDEC MO-178 compliant), 3.00mm × 1.75mm × 1.30mm body, lead pitch 0.65mm, lead coplanarity ≤ 0.1mm. RoHS-compliant lead-free variant denoted by "+" suffix.
| 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 to set custom reset threshold for auxiliary rails (e.g., 1.8V, 1.2V). |
| 2 - VCC | Main supply input & power rail | Primary monitoring node and device power source; asserts both resets when falling below 2.19V; operates down to 1.0V with guaranteed reset validity. |
| 3 - CSRT | RESET2 timeout configuration node | Selects RESET2 timing mode: tied to VCC → fixed 140ms (min); connected to capacitor → user-adjustable delay (e.g., 3.1ms with 1500pF). |
| 4 - GND | Analog/digital ground reference | Common return path for all internal comparators, timers, and output drivers; must be low-impedance to ensure noise immunity. |
| 5 - RESET2 | Secondary reset output | Open-drain, active-low output; asserts before RESET1 on power-down and deasserts only after RESET1 releases - enforces strict sequencing order. |
| 6 - R2 | Internal pullup connection for RESET2 | 47kΩ internal resistor tied to RESET2; connect to external VOH (e.g., 3.3V) to set high-level voltage independently of VCC. |
| 7 - RESET1 | Primary reset output | Push-pull, active-low output (MAX6392-specific); drives full logic swing without external pullup; asserts first on power-down, releases first on power-up. |
| 8 - MR | Manual reset input | Active-low, internally pulled up to VCC via 47kΩ; forces both RESET1 and RESET2 low for ≥50µs pulse; immune to <100ns glitches. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises master (VCC) and slave (RESET IN2) supplies with separate thresholds - eliminates need for two discrete supervisors. |
| Guaranteed reset operation at VCC = 1.0V | Enables fail-safe reset assertion during severe brownout, unlike most supervisors that cease functioning below 1.2V–1.5V. |
| Configurable RESET2 timing | CSRT pin supports either fixed 140ms timeout (for simplicity) or capacitor-adjustable delay (for precision sequencing), reducing BOM count. |
| Integrated MR with glitch rejection | 50µs minimum pulse width + 100ns glitch filter prevents spurious resets from switch bounce or EMI - no external RC filtering required. |
| Independent VOH control via R1/R2 | R2 (pin 6) allows RESET2 to be pulled to 3.3V or 2.5V while VCC = 5V - essential for mixed-voltage system interfacing without level shifters. |
Applications
| Industrial PLC Controllers | Server Power Sequencing |
|---|---|
|
Use Scenario: Dual-rail power delivery to FPGA and ARM-based controller, where core (1.2V) must initialize before I/O (3.3V). IC Role / Device Role / Timing Role: MAX6392KA22+ monitors 1.2V core rail at RESET IN2 (via divider) and 3.3V I/O rail at VCC; generates RESET1 for I/O domain and RESET2 for core domain with enforced release order. Use Value: Ensures FPGA configuration completes before peripheral initialization - preventing bus contention and boot failure in field-deployed equipment. |
Use Scenario: 12V/5V/3.3V/1.8V multi-rail server motherboard requiring staggered power-up to limit inrush current. IC Role / Device Role / Timing Role: MAX6392KA22+ acts as primary sequencer: VCC = 5V rail, RESET IN2 = 1.8V rail; RESET1 controls 3.3V LDO enable, RESET2 controls 1.8V LDO enable with delayed release. Use Value: Reduces peak inrush by >40% versus simultaneous rail activation - avoids tripping upstream 5V supply OCP and improves system reliability. |
| Medical Imaging Subsystem | Automotive ADAS Camera Module |
|
Use Scenario: High-resolution image sensor with analog front-end (2.5V) and digital processing core (1.1V), requiring precise reset coordination. IC Role / Device Role / Timing Role: MAX6392KA22+ uses VCC = 2.5V (analog rail), RESET IN2 = 1.1V (core rail via divider); RESET1 resets analog block, RESET2 resets digital block after analog stabilization. Use Value: Prevents digital noise coupling into analog signal chain during startup - eliminates image artifacts in diagnostic-grade ultrasound output. |
Use Scenario: Automotive camera module with 12V input, DC/DC converted 5V and 1.2V rails, subject to cold-crank transients. IC Role / Device Role / Timing Role: MAX6392KA22+ monitors 5V rail at VCC and 1.2V rail at RESET IN2; MR input tied to vehicle ignition signal; immune to -2V/100ns VCC glitches per spec. Use Value: Maintains deterministic reset behavior during engine start - avoids camera boot lockup and ensures ASIL-B compliance for vision-based safety functions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6391KA22+ | No MR input; RESET1 is open-drain (not push-pull); lacks manual reset capability and internal MR pullup. | Suitable only where software/hardware reset initiation is unnecessary - e.g., fixed-function embedded controllers with no field service requirement. | Select MAX6391KA22+ only if MR is unused and external pullups for RESET1 are acceptable; MAX6392KA22+ preferred for serviceability. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V fixed threshold); no secondary supply monitor or sequenced dual-reset outputs; no MR glitch rejection spec. | Limited to single-rail systems; cannot replace MAX6392KA22+ in dual-voltage sequencing without adding external logic or second IC. | Use TPS3808G33DBVR only for cost-sensitive single-rail applications; not a functional substitute for MAX6392KA22+'s dual-monitoring architecture. |
Compared with MAX6391KA22+, the MAX6392KA22+ adds MR with glitch immunity and push-pull RESET1 - simplifying board layout and enabling field-service reset. Compared with TPS3808G33DBVR, it delivers true dual-supply monitoring and enforced sequencing - eliminating design compromises in multivoltage systems.
Availability
MAX6392KA22+ is available at Aetrix Electronics and suitable for industrial PLC controllers, server power sequencing, medical imaging subsystems, and automotive ADAS camera modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6392KA22+ 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 demanding industrial, computing, and automotive applications - emphasizing reliability, low power, and integration.
The MAX6391/MAX6392 product line was designed specifically for multivoltage microprocessor systems requiring deterministic, sequenced reset generation - targeting servers, medical devices, and programmable logic controllers where power-up order directly impacts functional safety.
FAQ
What is the exact VCC reset threshold voltage for MAX6392KA22+?
The MAX6392KA22+ has a factory-trimmed VCC reset threshold of 2.19V, with a tolerance of ±0.07V across the full -40°C to +85°C temperature range. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold (VTH1)" for ordering code KA22, and corresponds to top-mark "AAHY" per the Selector Guide.
Does MAX6392KA22+ support adjustable reset timeout for both RESET1 and RESET2?
No - only RESET2 timeout is adjustable via the CSRT pin. RESET1 timeout is fixed at 140ms (minimum) and internally generated; it cannot be modified. RESET2 timeout can be set to 140ms (min) by connecting CSRT to VCC, or made user-adjustable by connecting CSRT to an external capacitor (e.g., 1500pF yields ~3.1ms).
Can MAX6392KA22+ monitor a 1.2V supply as the secondary voltage?
Yes - the RESET IN2 input uses a fixed 625mV internal reference, so a 1.2V supply can be monitored using an external resistor divider. For example, a 1.2V rail with R3 = 909kΩ and R4 = 1MΩ yields VRST = 625mV × (1.909/1) ≈ 1.195V, meeting typical 1.2V ±5% tolerance requirements.
What is the function of the R2 pin on MAX6392KA22+?
The R2 pin on MAX6392KA22+ connects to an internal 47kΩ pullup resistor tied to the open-drain RESET2 output. To set RESET2's high-level voltage (VOH) to a value different from VCC - such as 3.3V in a 5V system - connect R2 to that external voltage rail. This eliminates need for external pullup resistors or level shifters.
Is MAX6392KA22+ compatible with 1.0V VCC operation?
Yes - the MAX6392KA22+ guarantees valid reset assertion and timing down to VCC = 1.0V, as explicitly stated in the Features list and Electrical Characteristics table. This enables reliable operation during deep brownout conditions where many competing supervisors cease functioning below 1.2V.
MAX6392KA22+ 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 Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6392KA22+ FAQ
1.How can I place an order for MAX6392KA22+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6392KA22+ 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+ reliable?
The price and inventory of MAX6392KA22+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6392KA22+ is usually 5 days.
3.What payment methods are accepted for MAX6392KA22+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6392KA22+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6392KA22+?
MAX6392KA22+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6392KA22+ 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+?
For technical support, including MAX6392KA22+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6392KA22+ requirements.
6.How does Aetrix verify that MAX6392KA22+ is sourced from the original manufacturer or authorized distributors?
All MAX6392KA22+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6392KA22+?
All MAX6392KA22+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6392KA22+, 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+ part is unused and in its original packaging.
Return procedure for MAX6392KA22+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6392KA22+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
