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Analog Devices Inc./Maxim Integrated MAX6392KA29-T
- Part No.:
- MAX6392KA29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6392KA29-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
MAX6392KA29-T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with sequenced reset outputs, designed for multi-rail systems requiring controlled power-up/power-down sequencing. It monitors VCC (2.93V factory-fixed threshold) and an adjustable secondary supply (RESET IN2 down to 625mV), provides push-pull RESET1 and open-drain RESET2 with guaranteed reset validity down to VCC = 1V, and includes active-low manual reset (MR) - used in industrial controllers and multivoltage servers.
For engineers reviewing the MAX6392KA29-T datasheet, MAX6392KA29-T pinout, MAX6392KA29-T application, or MAX6392KA29-T equivalent, this device delivers deterministic reset timing (140ms min RESET1 timeout, fixed or capacitor-adjustable RESET2 timeout), immunity to short VCC transients, and precise dual-threshold supervision critical for reliable µP boot in embedded computing and industrial equipment.
Technical Context
The MAX6392KA29-T implements two independent voltage monitoring paths: a master VCC comparator (fixed 2.93V threshold) driving RESET1, and a secondary comparator on RESET IN2 (625mV reference) enabling user-defined thresholds via external resistor divider. RESET2 asserts whenever either input falls below its threshold and deasserts only after both inputs exceed thresholds *and* RESET1 has deasserted - enforcing strict power-on sequence (RESET1 before RESET2).
Its internal architecture includes a 600nA current source for CSRT-based RESET2 timeout adjustment, a 47kΩ internal MR pullup, and separate reset delay logic ensuring tRD2 < tRD1 during power-down and tRP2 ≥ tRP1 during power-up. The device operates across 1.2V–5.5V VCC and guarantees functional reset behavior down to VCC = 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V (factory-fixed, ±75mV tolerance) - sets primary brownout detection point for system master supply |
| RESET IN2 Threshold | 625mV (internal reference) - enables monitoring of secondary supplies as low as 625mV via external resistor divider |
| RESET1 Timeout | 140ms minimum - ensures stable µP reset hold time after VCC recovery, independent of external components |
| RESET2 Timeout | 140ms minimum (CSRT tied to VCC) or user-adjustable (CSRT to capacitor) - supports flexible sequencing between primary and secondary subsystems |
| Supply Current | 15µA typical - enables ultra-low-power supervision in battery-backed or energy-sensitive applications |
| Reset Validity Range | VCC ≥ 1.0V - guarantees correct reset assertion/deassertion even during deep brownout conditions |
| MR Input Pulse Width | 50µs minimum - allows robust manual reset triggering without susceptibility to noise or contact bounce |
Pinout & Package
MAX6392KA29-T is housed in an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch), specified 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; connects to external resistive divider to set custom reset threshold |
| 2 - VCC | Main supply and master monitor input | Power supply pin and input to primary reset comparator (2.93V threshold); also powers internal circuitry |
| 3 - CSRT | RESET2 timeout configuration node | Connect to VCC for fixed 140ms RESET2 timeout, or to external capacitor for user-adjustable timeout (tRP2 = 2.08×10⁶ × CCSRT) |
| 4 - GND | Ground reference | Common return path for all internal circuits and output sinks |
| 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 connected to RESET2; tie to external VOH voltage (e.g., 3.3V or 5V) for level-shifted high-state drive |
| 7 - RESET1 | Primary reset output | Active-low push-pull output (MAX6392-specific); eliminates need for external pullup in most µP interface applications |
| 8 - MR | Manual reset input | Active-low input with internal 47kΩ pullup to VCC; forces both RESET1 and RESET2 low when asserted |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of master (VCC @ 2.93V) and slave (RESET IN2 @ 625mV ref) supplies enables true multirail sequencing |
| Guaranteed reset validity to 1V | Ensures reliable reset assertion during severe brownout events where VCC drops below 1.2V, critical for fail-safe shutdown |
| Sequenced reset timing control | Hardware-enforced ordering: RESET2 always asserts before RESET1 on power-down and deasserts after RESET1 on power-up |
| Low-glitch immunity | Rejects VCC transients ≤100ns (at ≥10mV overdrive), preventing spurious resets in electrically noisy industrial environments |
| Flexible RESET2 timeout | Supports either fixed 140ms delay (CSRT→VCC) or precision-adjustable delay (CSRT→capacitor), simplifying BOM across design variants |
Applications
| Industrial Controllers | Servers / Workstations |
|---|---|
|
Use Scenario: PLCs and motion controllers with separate 3.3V I/O and 1.8V core rails requiring synchronized startup. IC Role / Device Role / Timing Role: Primary supervisor enforcing RESET1 (core) before RESET2 (I/O) to prevent bus contention during boot. Use Value: Eliminates need for discrete RC timers and dual-reset ICs, reducing component count by 3+ parts while guaranteeing sequence compliance per IEC 61000-4-4. |
Use Scenario: Dual-CPU server motherboards with independent 12V/5V/3.3V/1.8V rails and hot-swap capability. IC Role / Device Role / Timing Role: Monitors main 3.3V rail (VCC) and auxiliary 1.8V rail (via RESET IN2 divider) to coordinate CPU, memory, and PCIe reset timing. Use Value: Enables single-chip solution for JEDEC JESD79-4 DDR4 reset sequencing requirements, including 140ms minimum reset hold time. |
| Set-Top Boxes | Printers / MFPs |
|
Use Scenario: Consumer STBs with ARM SoC (1.2V core), DDR3 (1.5V), and HDMI PHY (3.3V) requiring staggered power enable. IC Role / Device Role / Timing Role: Generates RESET1 for SoC and RESET2 for peripheral domain, with MR supporting front-panel reset button. Use Value: Integrates manual reset, dual-threshold monitoring, and sequenced outputs in 8-pin SOT23 - saving >25mm² PCB area vs. discrete alternatives. |
Use Scenario: Multifunction printers with motor drivers (24V), logic (5V), and imaging ASIC (1.1V) needing coordinated reset release. IC Role / Device Role / Timing Role: Uses RESET IN2 to monitor 1.1V ASIC rail (via divider) while VCC tracks 5V logic rail, asserting RESET2 only after both stabilize. Use Value: Prevents ASIC lockup during partial power-up by ensuring 1.1V rail is valid *before* releasing its reset, meeting Canon/Panasonic OEM spec 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 |
|---|---|---|---|
| MAX6391KA29-T | Open-drain RESET1 (no MR input); lacks manual reset and push-pull output | Requires external pullup for RESET1; unsuitable where board space or BOM count must be minimized with integrated MR | Select when manual reset is unnecessary and cost sensitivity favors simpler variant |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no secondary adjustable input or sequenced dual outputs | Cannot replace MAX6392KA29-T in multivoltage sequencing roles; limited to single-rail brownout detection | Use only for basic 3.3V reset supervision where dual-threshold sequencing is not required |
Compared with MAX6391KA29-T and TPS3808G33DBVR, the MAX6392KA29-T uniquely combines factory-trimmed dual-threshold supervision, hardware-enforced reset sequencing, and integrated manual reset in a single 8-pin package - making it irreplaceable for designs requiring guaranteed power-up order across two independent voltage domains.
Availability
MAX6392KA29-T is available at Aetrix Electronics and suitable for industrial controllers, servers/workstations, and set-top boxes requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6392KA29-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, computing, and communications applications.
The MAX6392KA29-T belongs to Maxim's µP supervisory product line, engineered specifically for deterministic power sequencing in multivoltage embedded systems where reliability under brownout and transient conditions is non-negotiable.
FAQ
What is the factory-set VCC reset threshold voltage for MAX6392KA29-T?
The MAX6392KA29-T has a factory-trimmed VCC reset threshold of 2.93V (minimum 2.85V, maximum 3.00V at TA = +25°C). This value is laser-trimmed during production and applies across the full -40°C to +85°C operating range. The MAX6392KA29-T uses this fixed threshold to assert RESET1 whenever VCC drops below this level, ensuring consistent brownout detection without external calibration.
Does MAX6392KA29-T support manual reset functionality, and how is it implemented?
Yes, the MAX6392KA29-T includes an active-low manual reset input (MR) on pin 8. It features an internal 47kΩ pullup resistor to VCC, so MR remains inactive (HIGH) when left unconnected. Pulling MR LOW forces both RESET1 and RESET2 active for the full timeout period, then releases them with standard 140ms+ delays after MR returns HIGH. This makes MAX6392KA29-T suitable for front-panel reset buttons without external components.
How does the MAX6392KA29-T ensure proper power-up sequencing between RESET1 and RESET2?
The MAX6392KA29-T enforces sequencing through dedicated internal logic: RESET2 remains asserted until *after* RESET1 has deasserted during power-up, and asserts *before* RESET1 during power-down. This behavior is hardwired - not dependent on external timing components - and verified across temperature and voltage ranges. As a result, MAX6392KA29-T guarantees that peripherals (driven by RESET2) initialize only after the core processor (driven by RESET1) is fully ready.
Can MAX6392KA29-T monitor a 1.2V supply as the secondary voltage, and what is required?
Yes, the MAX6392KA29-T can monitor a 1.2V supply using the RESET IN2 pin. Since the internal reference is fixed at 625mV, an external resistor divider (R3/R4) must be connected to RESET IN2 to scale the 1.2V supply down to 625mV. For example, with R4 = 500kΩ, R3 ≈ 470kΩ achieves VRST = 1.2V. This configuration is explicitly supported in the MAX6392KA29-T datasheet and maintains full accuracy across temperature.
What is the minimum VCC voltage at which MAX6392KA29-T guarantees correct reset operation?
The MAX6392KA29-T guarantees valid reset assertion and deassertion down to VCC = 1.0V (over full temperature range). Below this, the internal comparators and output drivers may not function reliably. This 1.0V specification enables safe system shutdown during deep brownout events - a key requirement for industrial and telecom equipment complying with IEC 61000-4-29. The MAX6392KA29-T continues to monitor and respond correctly even as VCC collapses from nominal to 1.0V.
MAX6392KA29-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:
- 2.93V, 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
MAX6392KA29-T FAQ
1.How can I place an order for MAX6392KA29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6392KA29-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 MAX6392KA29-T reliable?
The price and inventory of MAX6392KA29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6392KA29-T is usually 5 days.
3.What payment methods are accepted for MAX6392KA29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6392KA29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6392KA29-T?
MAX6392KA29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6392KA29-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 MAX6392KA29-T?
For technical support, including MAX6392KA29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6392KA29-T requirements.
6.How does Aetrix verify that MAX6392KA29-T is sourced from the original manufacturer or authorized distributors?
All MAX6392KA29-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 MAX6392KA29-T meets industry standards.
7.What is the process for return or replacement of MAX6392KA29-T?
All MAX6392KA29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6392KA29-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 MAX6392KA29-T part is unused and in its original packaging.
Return procedure for MAX6392KA29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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