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Analog Devices Inc./Maxim Integrated MAX6392KA29+
- Part No.:
- MAX6392KA29+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6392KA29+.pdf
- Description:
- MAX6392 DUAL-VOLTAGE MICROPROCES
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6392KA29+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with sequenced reset outputs, monitoring VCC (2.93V factory-fixed threshold) and an adjustable secondary supply (RESET IN2), delivering time-ordered active-low RESET1 (push-pull) and RESET2 (open-drain) for multi-rail power sequencing in embedded systems. It guarantees valid reset operation down to VCC = 1.0V, features 15µA typical supply current, and operates across –40°C to +85°C.
For engineers reviewing the MAX6392KA29+ datasheet, MAX6392KA29+ pinout, MAX6392KA29+ application, or MAX6392KA29+ equivalent, this device supports critical timing-critical power-up/down sequencing in servers, industrial controllers, and multivoltage µP systems where deterministic reset ordering between master and slave rails is required.
Technical Context
The MAX6392KA29+ implements two independent voltage-monitoring comparators: one fixed at 2.93V on VCC (master reset source), and one referenced to 625mV on RESET IN2 (adjustable via external resistor divider). RESET1 asserts only on VCC undervoltage and deasserts after a fixed 140ms minimum timeout; RESET2 asserts if either VCC or RESET IN2 falls below threshold and deasserts after either 140ms (CSRT tied to VCC) or a capacitor-adjustable delay.
It integrates an active-low manual reset (MR) input with 47kΩ internal pullup, triggering synchronized assertion of both RESET1 and RESET2 within 10µs (MR→RESET1) and 100ns (MR→RESET2), with skew ≤10µs. The device uses BiCMOS process (810 transistors), supports VCC from 1.2V to 5.5V, and maintains reset validity down to 1.0V - enabling reliable brownout detection in low-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.85V (min) to 3.00V (max); factory-trimmed 2.93V nominal ensures precise 3.3V rail supervision without external calibration. |
| RESET IN2 Threshold | 610mV–640mV; internal 625mV reference enables monitoring of supplies as low as 625mV using external resistive divider. |
| RESET1 Timeout | 140ms (min) to 280ms (max); fixed internal timer guarantees minimum reset hold time for safe µP initialization. |
| RESET2 Timeout | 140ms (min) fixed when CSRT = VCC; user-adjustable (e.g., 3.1ms with 1500pF) when CSRT = capacitor to ground. |
| Supply Current | 15µA typical at +25°C; ultra-low quiescent current minimizes standby power in battery-backed or energy-sensitive systems. |
| Reset Valid Down To | VCC = 1.0V; ensures functional reset assertion during deep brownout conditions before system collapse. |
| MR Input Pulse Width | 50µs minimum; supports clean manual reset initiation even with short push-button actuations or noisy control lines. |
Pinout & Package
MAX6392KA29+ is housed in an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch), RoHS-compliant and available in 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 to set custom reset threshold for slave rail. |
| 2 - VCC | Main supply & master monitor input | Power supply pin and primary reset trigger; asserts both resets when falling below 2.93V; powers internal circuitry. |
| 3 - CSRT | RESET2 timeout configuration node | Connect to VCC for fixed 140ms RESET2 delay; connect to capacitor-to-ground for user-adjustable delay (e.g., 1500pF → 3.1ms). |
| 4 - GND | Analog/digital ground reference | Common return path for all internal comparators, timers, and output drivers; must be low-impedance for noise immunity. |
| 5 - RESET2 | Secondary reset output | Active-low open-drain output; asserted when VCC < 2.93V OR RESET IN2 < 625mV; deasserts after RESET1 and timeout period. |
| 6 - R2 | Internal pullup connection for RESET2 | 47kΩ internal resistor tied to RESET2; connect to external VOH (e.g., 3.3V or 5V) to set high-level voltage independently of VCC. |
| 7 - RESET1 | Primary reset output | Active-low push-pull output (MAX6392-specific); provides full rail-to-rail drive without external pullup; deasserts first during power-up. |
| 8 - MR | Manual reset input | Active-low input with 47kΩ internal pullup to VCC; forces synchronous assertion of RESET1 and RESET2; no external components needed. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitors | Simultaneous supervision of master (VCC @ 2.93V) and slave (RESET IN2 @ 625mV ref) rails enables true two-rail sequencing without external comparators. |
| Sequenced reset timing | Guaranteed RESET1 deassertion before RESET2 during power-up (tRP1 < tRP2), and RESET2 assertion before RESET1 during power-down (tRD2 < tRD1). |
| Flexible RESET2 timeout | Selectable fixed (140ms min) or capacitor-adjustable (down to ~3ms) delay allows optimization for fast-boot or fail-safe timing requirements. |
| Low-power operation | 15µA typical ICC enables integration into always-on monitoring paths without compromising system energy budget. |
| Brownout resilience | Valid reset assertion down to VCC = 1.0V ensures reliable operation during gradual voltage collapse, not just hard dropout. |
Applications
| Industrial PLC Controllers | Servers / Workstations |
|---|---|
|
Use Scenario: Power sequencing across 12V, 5V, and 3.3V rails in programmable logic controller backplanes with FPGA, MCU, and I/O ASICs. IC Role / Device Role / Timing Role: Master supervisor coordinating controlled ramp-up order: 12V → 5V → 3.3V, ensuring FPGA config completes before MCU boot. Use Value: Prevents latch-up and metastability by enforcing strict power-rail enable sequence; eliminates need for discrete RC timers or multiple supervisors. |
Use Scenario: Dual-rail (VCCP = 1.8V, VCCIO = 3.3V) CPU power management in rack-mounted servers with hot-swap capability. IC Role / Device Role / Timing Role: Monitors both core and I/O supplies; asserts RESET2 only after RESET1 confirms stable core voltage, preventing premature PCIe link training. Use Value: Enables compliant PCIe Gen4/5 power sequencing per specification, reducing boot failures and field returns. |
| Medical Imaging Subsystems | Industrial HMI Panels |
|
Use Scenario: Multivoltage imaging sensor array (1.2V analog, 2.5V digital, 3.3V interface) requiring glitch-free startup in MRI-adjacent equipment. IC Role / Device Role / Timing Role: Supervises 3.3V master rail and 1.2V analog rail via resistor divider on RESET IN2; provides MR-triggered safe reboot during EMI events. Use Value: Immunity to sub-100ns VCC transients prevents spurious resets near high-field magnets; MR allows operator-initiated recovery without power cycle. |
Use Scenario: Touchscreen-based human-machine interface with ARM Cortex-M7 MCU, display driver, and isolated CAN bus interface. IC Role / Device Role / Timing Role: Sequences 3.3V MCU supply (RESET1) before 5V display backlight (RESET2), while monitoring isolated 5V CAN transceiver rail via RESET IN2 divider. Use Value: Eliminates display flicker and CAN bus arbitration errors during cold start by enforcing strict supply enable order and voltage stability checks. |
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+ | No MR input; RESET1 and RESET2 both open-drain with internal 47kΩ pullups (R1/R2 pins); lacks manual reset functionality. | Suitable where board space permits external MR circuit or where manual reset is unnecessary; requires external pullup for non-VCC VOH. | Choose MAX6391KA29+ only if MR is unused and open-drain flexibility with independent VOH is preferred over push-pull drive. |
| TPS3808G33DBVR | Single-supply monitor (3.3V fixed); no secondary adjustable input; no sequenced dual-reset outputs; only one reset output with adjustable delay. | Applicable only for single-rail systems; cannot replace MAX6392KA29+ in dual-rail sequencing roles without adding external logic or second IC. | Select TPS3808G33DBVR only for cost-sensitive, single-rail applications where sequenced dual-reset is not required. |
Compared with MAX6391KA29+, the MAX6392KA29+ adds MR-triggered synchronous reset and push-pull RESET1 for direct µP reset pin drive; compared with TPS3808G33DBVR, it uniquely delivers guaranteed time-ordered dual-reset outputs essential for multivoltage SoC and FPGA platforms.
Availability
MAX6392KA29+ is available at Aetrix Electronics and suitable for industrial PLC controllers, server/workstation power management, medical imaging subsystems, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and guaranteed reset sequencing integrity.
Supply support for MAX6392KA29+ 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 communications applications.
The MAX6392KA29+ belongs to Maxim's µP supervisory product line, engineered specifically for deterministic, dual-rail power sequencing in systems where uncontrolled reset timing risks data corruption, hardware lockup, or interface protocol violations.
FAQ
What is the factory-trimmed VCC reset threshold voltage for MAX6392KA29+?
The MAX6392KA29+ has a factory-trimmed VCC reset threshold of 2.93V nominal, with a guaranteed range of 2.85V (min) to 3.00V (max) over –40°C to +85°C. This precise threshold makes the MAX6392KA29+ ideal for supervising standard 3.3V rails without external calibration or trimming components.
Does MAX6392KA29+ support manual reset, and how is it implemented?
Yes, the MAX6392KA29+ includes an active-low manual reset (MR) input on pin 8, with a built-in 47kΩ pullup resistor to VCC. Pulling MR low synchronously asserts both RESET1 and RESET2; RESET1 responds within 10µs and RESET2 within 100ns. The MAX6392KA29+ does not require external pullup or debounce circuitry for MR operation.
How is the RESET2 timeout period configured on MAX6392KA29+?
The RESET2 timeout on MAX6392KA29+ is configured via the CSRT pin (pin 3): tie CSRT to VCC for a fixed 140ms (min) delay, or connect CSRT to a capacitor-to-ground (e.g., 1500pF yields ~3.1ms) for user-adjustable timing. The MAX6392KA29+ automatically detects the connection mode and selects the appropriate internal timing path.
Can MAX6392KA29+ monitor a 1.2V supply as the secondary rail?
Yes, the MAX6392KA29+ can monitor a 1.2V supply on RESET IN2 (pin 1) using an external resistor divider. With its internal 625mV reference, a 1.2V rail maps to a divider ratio of R3/R4 ≈ 0.92, allowing accurate threshold setting. The MAX6392KA29+ guarantees valid reset assertion even if VCC drops to 1.0V during the event.
What is the difference between MAX6392KA29+ and MAX6391KA29+?
The MAX6392KA29+ differs from MAX6391KA29+ in two key ways: it replaces the R1 pullup resistor (pin 8) with an active-low MR input, and changes RESET1 (pin 7) from open-drain to push-pull output. Thus, the MAX6392KA29+ provides manual reset capability and direct-drive reset signaling without external pullup, while MAX6391KA29+ offers dual open-drain outputs with configurable VOH.
MAX6392KA29+ 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 Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6392KA29+ FAQ
1.How can I place an order for MAX6392KA29+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6392KA29+ 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+ reliable?
The price and inventory of MAX6392KA29+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6392KA29+ is usually 5 days.
3.What payment methods are accepted for MAX6392KA29+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6392KA29+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6392KA29+?
MAX6392KA29+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6392KA29+ 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+?
For technical support, including MAX6392KA29+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6392KA29+ requirements.
6.How does Aetrix verify that MAX6392KA29+ is sourced from the original manufacturer or authorized distributors?
All MAX6392KA29+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6392KA29+?
All MAX6392KA29+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6392KA29+, 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+ part is unused and in its original packaging.
Return procedure for MAX6392KA29+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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