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Analog Devices Inc./Maxim Integrated MAX6392KA17+T
- Part No.:
- MAX6392KA17+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6392KA17+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6392KA17+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with sequenced reset outputs, monitoring VCC (1.67V factory-fixed threshold) and an adjustable secondary supply (RESET IN2 down to 625mV), featuring push-pull RESET1 and open-drain RESET2 with 140ms minimum timeout periods, used in multivoltage power-up sequencing for industrial controllers and servers.
For engineers reviewing the MAX6392KA17+T datasheet, MAX6392KA17+T pinout, MAX6392KA17+T application, or MAX6392KA17+T equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, active-low manual reset (MR) input with 50µs minimum pulse width, and CSRT-configurable RESET2 timeout period - critical for reliable dual-rail system initialization and brownout recovery.
Technical Context
The MAX6392KA17+T implements two independent voltage-monitoring comparators: one fixed at 1.67V on VCC (master reset source), and one referenced to 625mV on RESET IN2 (slave supply monitor). RESET1 deasserts 140ms (min) after VCC exceeds 1.67V, while RESET2 deasserts either 140ms (min) after both VCC and RESET IN2 exceed thresholds-or after a capacitor-adjustable delay set via CSRT.
During power-up, RESET2 always deasserts after RESET1; during power-down, RESET2 asserts before RESET1. The MR input forces both resets low with 10µs MR-to-RESET1 delay and 100ns MR-to-RESET2 delay, and includes a 47kΩ internal pullup to VCC. Reset outputs are guaranteed functional down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.67V (factory-fixed); ensures deterministic reset assertion when primary supply falls below nominal 1.8V rail. |
| RESET IN2 Threshold | 625mV (internal reference); enables monitoring of secondary supplies as low as 625mV via external resistor divider. |
| RESET1 Timeout | 140ms (min); fixed internal timing guarantees sufficient hold time for CPU core initialization before release. |
| RESET2 Timeout | 140ms (min) fixed or capacitor-adjustable; supports flexible sequencing where slave logic powers up after master processor. |
| Supply Current | 15µA (typ); ultra-low quiescent current enables use in battery-backed or always-on monitoring circuits. |
| Reset Valid Down To | VCC = 1V; allows reliable reset generation even during deep brownout conditions before full supply collapse. |
| MR Input Pulse Width | 50µs (min); accommodates short manual reset button presses without requiring debouncing circuitry. |
| Operating Temp Range | -40°C to +85°C; qualified for industrial-grade embedded systems including programmable logic controllers and network equipment. |
Pinout & Package
Package: 8-pin SOT23 (JEDEC MO-178 compliant), 3.00mm × 1.75mm × 1.30mm body, lead-free +T variant.
| 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 reset threshold. |
| 2 - VCC | Main supply and master reset input | Power supply input and primary voltage monitor; asserts all resets when falling below 1.67V. |
| 3 - CSRT | RESET2 timeout configuration node | Connect to VCC for fixed 140ms timeout; connect to capacitor-to-ground for user-adjustable delay (e.g., 3.1ms with 1500pF). |
| 4 - GND | Analog/digital ground reference | Common return path for all internal comparators, reset drivers, and MR input; must be low-impedance. |
| 5 - RESET2 | Secondary reset output | Active-low open-drain output; asserted before RESET1 on power-down and deasserted after RESET1 on power-up. |
| 6 - R2 | Internal pullup connection for RESET2 | 47kΩ internal resistor; connect to external VOH rail (e.g., 3.3V) to set RESET2 high-level voltage independently of VCC. |
| 7 - RESET1 | Primary reset output | Active-low push-pull output; provides direct drive without external pullup; compatible with TTL/CMOS logic inputs. |
| 8 - MR | Manual reset input | Active-low input with 47kΩ internal pullup to VCC; forces both RESET1 and RESET2 low when asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitors | Enables simultaneous supervision of primary (1.67V) and secondary (adjustable down to 625mV) rails without external comparators. |
| Sequenced reset timing control | Guarantees RESET2 asserts before RESET1 on power-down and deasserts after RESET1 on power-up - essential for safe multi-rail sequencing. |
| CSRT-configurable RESET2 timeout | Supports either fixed 140ms delay (CSRT = VCC) or precise user-defined delay (e.g., 3.1ms–100ms) via external capacitor - no firmware required. |
| MR input with sub-100ns skew | Ensures synchronized assertion of both resets with <10µs RESET1 and <100ns RESET2 response - eliminates race conditions during manual reset. |
| Reset operation down to VCC = 1V | Provides fail-safe reset signaling during severe brownout, enabling graceful shutdown before logic corruption occurs. |
| 15µA supply current | Minimizes standby power in always-on monitoring applications such as remote sensors or backup controllers. |
Applications
| Industrial PLC Power Sequencing | Server Dual-Rail Initialization |
|---|---|
|
Use Scenario: A programmable logic controller uses separate 5V and 3.3V rails to power I/O modules and CPU core, requiring strict power-up order to prevent latch-up. IC Role / Device Role / Timing Role: MAX6392KA17+T monitors both rails and sequences RESET2 (for 3.3V domain) to assert after RESET1 (for 5V domain), enforcing safe boot order. Use Value: Eliminates need for discrete RC timers and dual comparators, reducing BOM count by ≥4 components while improving timing accuracy over temperature. |
Use Scenario: A rack-mounted server motherboard powers CPU, memory, and PCIe peripherals from independent DC-DC converters with different ramp rates. IC Role / Device Role / Timing Role: MAX6392KA17+T acts as centralized sequencer: RESET1 controls CPU reset, RESET2 controls peripheral reset, with MR enabling system-level hard reset. Use Value: Enables single-chip coordination of three-domain power sequencing, reducing PCB layout complexity and eliminating timing mismatches between discrete supervisors. |
| Network Equipment Brownout Recovery | Medical Diagnostic Instrument Startup |
|
Use Scenario: An Ethernet switch experiences intermittent AC line sags causing partial rail collapse; system must detect brownout and initiate controlled restart. IC Role / Device Role / Timing Role: MAX6392KA17+T monitors main 12V-to-3.3V converter output (via resistor divider on RESET IN2) and VCC (3.3V), asserting resets only when both fall below thresholds. Use Value: Immunity to short negative transients (<100ns) prevents spurious resets during ESD events, while 1V valid operation ensures reset remains active until full rail collapse. |
Use Scenario: A portable ultrasound device requires fail-safe startup where FPGA, ADC, and display subsystems must initialize in strict dependency order. IC Role / Device Role / Timing Role: MAX6392KA17+T generates RESET1 for FPGA configuration and RESET2 for analog front-end, with CSRT capacitor tuned to match ADC settling time. Use Value: Guarantees FPGA completes configuration before analog biasing begins, preventing signal corruption and meeting IEC 62304 safety timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6392KA22+T | Factory-fixed VCC threshold = 2.19V instead of 1.67V; identical pinout, timing, and feature set. | Suitable for 2.5V/3.3V dual-rail systems rather than 1.8V/3.3V; same sequencing behavior and MR functionality. | Select when primary supply is 2.5V nominal and 2.19V reset threshold better matches system margin requirements. |
| TPS3808G125DBVR | Single-supply supervisor (1.25V threshold), no secondary monitor or sequenced outputs; SOT23-6 package. | Lacks RESET IN2 monitoring and RESET2 sequencing; supports only basic VCC supervision with adjustable delay. | Use only for simple single-rail applications; not a functional substitute for dual-voltage sequencing or MR-driven coordinated reset. |
Compared with MAX6392KA22+T, the MAX6392KA17+T provides tighter alignment with 1.8V system rails and earlier reset assertion during brownout; compared with TPS3808G125DBVR, it delivers true dual-supply coordination and manual reset synchronization - capabilities absent in single-channel alternatives.
Availability
MAX6392KA17+T is available at Aetrix Electronics and suitable for industrial PLCs, server motherboards, network switches, and medical diagnostic instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6392KA17+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, communications, and computing applications.
The MAX6391/MAX6392 product line delivers integrated dual-supply supervisory functions with sequenced reset outputs, targeting systems requiring deterministic power-up/down ordering across multiple voltage domains.
FAQ
What is the factory-set VCC reset threshold voltage for MAX6392KA17+T?
The MAX6392KA17+T has a factory-fixed VCC reset threshold of 1.67V (minimum 1.62V, maximum 1.71V), optimized for reliable supervision of 1.8V logic rails. This value is laser-trimmed during production and cannot be adjusted. The threshold ensures reset assertion well before 1.8V rail collapse, providing robust brownout protection for microprocessors and FPGAs powered from that supply. All electrical characteristics for MAX6392KA17+T are specified with this exact threshold in mind.
How does the manual reset (MR) input affect both reset outputs in MAX6392KA17+T?
The MR input on MAX6392KA17+T is an active-low signal with 47kΩ internal pullup to VCC; pulling MR low forces both RESET1 (push-pull) and RESET2 (open-drain) into active-low state immediately. RESET2 asserts within 100ns and RESET1 within 10µs of MR activation. Both remain asserted for their respective timeout periods (≥140ms) after MR returns high. This behavior is intrinsic to MAX6392KA17+T and differs from the MAX6391 series, which lacks MR functionality entirely.
Can MAX6392KA17+T monitor a 1.2V supply as the secondary voltage (RESET IN2)?
Yes - the MAX6392KA17+T can monitor a 1.2V supply on RESET IN2 using an external resistor divider. Since the internal reference is 625mV, a divider with R3 = 470kΩ and R4 = 500kΩ yields VRST ≈ 1.2V. The MAX6392KA17+T's high-impedance RESET IN2 input draws only 50nA, minimizing divider current. This capability enables supervision of low-voltage rails like 1.2V FPGA cores or DDR memory supplies, with RESET2 asserting if that rail drops below the calculated threshold.
What is the purpose of the CSRT pin on MAX6392KA17+T, and how is it configured?
The CSRT pin on MAX6392KA17+T selects RESET2 timeout mode: connecting CSRT to VCC enables a fixed 140ms (minimum) timeout, while connecting CSRT to a capacitor-to-ground enables user-adjustable delay (e.g., 3.1ms with 1500pF). The internal 600nA current source charges the capacitor until it reaches 1.25V, triggering RESET2 deassertion. This dual-mode flexibility is unique to MAX6392KA17+T and allows precise tuning of slave-domain power-up timing without external timing ICs.
Is MAX6392KA17+T compatible with 1V operation, and what does "reset valid to VCC = 1V" mean?
Yes - MAX6392KA17+T guarantees correct reset assertion and timing functionality down to VCC = 1V, meaning the internal comparators, logic, and output drivers remain operational even as the supply collapses. This specification ensures the device continues generating valid reset signals during deep brownout events, allowing downstream processors to execute safe shutdown routines before VCC falls below functional logic thresholds. It is a verified characteristic of MAX6392KA17+T, not a theoretical limit.
MAX6392KA17+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.67V, 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
MAX6392KA17+T FAQ
1.How can I place an order for MAX6392KA17+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6392KA17+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 MAX6392KA17+T reliable?
The price and inventory of MAX6392KA17+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6392KA17+T is usually 5 days.
3.What payment methods are accepted for MAX6392KA17+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6392KA17+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6392KA17+T?
MAX6392KA17+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6392KA17+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 MAX6392KA17+T?
For technical support, including MAX6392KA17+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6392KA17+T requirements.
6.How does Aetrix verify that MAX6392KA17+T is sourced from the original manufacturer or authorized distributors?
All MAX6392KA17+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 MAX6392KA17+T meets industry standards.
7.What is the process for return or replacement of MAX6392KA17+T?
All MAX6392KA17+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6392KA17+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 MAX6392KA17+T part is unused and in its original packaging.
Return procedure for MAX6392KA17+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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