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Analog Devices Inc./Maxim Integrated MAX6320PUK29CY-T
- Part No.:
- MAX6320PUK29CY-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6320PUK29CY-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,372
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Product details
Overview
MAX6320PUK29CY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 2.93V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity, provides manual reset input (MR), and asserts reset during power-up, brownout, or software hang conditions in embedded control systems.
For engineers reviewing the MAX6320PUK29CY-T datasheet, MAX6320PUK29CY-T pinout, MAX6320PUK29CY-T application, or MAX6320PUK29CY-T equivalent, key selection criteria include its open-drain RESET output requiring external pullup, guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under VTH), and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MAX6320PUK29CY-T integrates a precision voltage detector, watchdog timer, and manual reset logic in a single die. Its reset generator triggers when VCC falls below 2.93V ±2.5% over –40°C to +125°C, with hysteresis of 3mV, and holds RESET low for ≥140ms after VCC recovers. The watchdog clears on any WDI edge and times out after 1.6s if unattended.
It features an open-drain NMOS RESET output (sinks current only), compatible with mixed-voltage systems up to 6V via external pullup, and a manual reset input (MR) with 52kΩ internal pullup, 100ns glitch rejection, and 1.5µs minimum pulse width at full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2.5% over –40°C to +125°C - sets precise brownout detection point for 3V systems |
| Reset Timeout Period | 140ms minimum - ensures sufficient hold time for microprocessor initialization |
| Watchdog Timeout | 1.6s typical - balances fault detection responsiveness with software execution margin |
| Supply Current | 5µA typical at 3.6V - enables ultra-low-power operation in battery-backed systems |
| Operating Temperature | –40°C to +125°C - supports industrial and automotive under-hood applications |
| RESET Output Type | Active-low open-drain - allows level-shifting and wired-OR reset bus configurations |
| AEC-Q100 Qualified | Grade 3 (–40°C to +125°C) - validated for automotive electronics reliability requirements |
Pinout & Package
MAX6320PUK29CY-T is housed in a 5-pin SOT23 package (package code U5+2A, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output - requires external pullup resistor (e.g., 10kΩ) to system supply up to 6V |
| 2 | GND | Ground reference - must be connected to system ground plane for stable reset assertion |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 52kΩ; debounced by 100ns glitch filter |
| 4 | WDI | Watchdog input - edge-sensitive; resets internal timer on rising or falling transition; disable by leaving floating |
| 5 | VCC | Supply voltage input - powers device and monitored rail; valid from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain RESET output | Supports multi-supply reset buses and level translation without additional logic |
| Factory-trimmed 2.93V threshold | Eliminates external resistor divider; guarantees accuracy across full temperature range |
| 140ms reset timeout | Meets JEDEC JESD78 requirement for microprocessor power-on reset duration |
| 1.6s watchdog period | Provides robust software hang detection while accommodating long interrupt service routines |
| Guaranteed operation to VCC = 1V | Ensures valid reset signaling during deep brownout or battery discharge conditions |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Supervises 3.3V microcontroller power rail in programmable logic controllers exposed to wide ambient temperature swings and EMI-rich factory environments. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor - asserts open-drain RESET to halt MCU execution during undervoltage or firmware lockup. Use Value: Prevents spurious I/O state changes and memory corruption during brownout, leveraging 2.93V threshold matched to 3V system margin and 140ms timeout aligned with PLC boot sequence. | Use Scenario: Monitors 5V supply feeding body control unit (BCU) microcontroller in vehicle door modules, operating from –40°C to +105°C. IC Role / Device Role / Timing Role: AEC-Q100 qualified supervisory IC - provides MR-initiated reset for service mode entry and watchdog-triggered recovery from CAN communication faults. Use Value: Enables fail-safe BCU restart without external components, using 1.6s watchdog timeout to cover worst-case CAN frame transmission delays and 2.93V threshold to avoid false trips during load-dump transients. |
| Portable Medical Devices | Smart Energy Meters |
Use Scenario: Ensures reliable startup and runtime supervision of ARM Cortex-M0+ MCU in handheld diagnostic equipment powered by single-cell Li-ion battery. IC Role / Device Role / Timing Role: Low-quiescent-current (5µA) supervisor - maintains reset assertion during battery voltage sag below 2.93V and detects firmware hangs via WDI toggling. Use Value: Extends battery life while guaranteeing deterministic reset behavior down to VCC = 1V, critical for FDA-cleared devices requiring predictable fault recovery. | Use Scenario: Supervises metrology SoC and real-time clock in DIN-rail mounted electricity meters subjected to grid voltage fluctuations and thermal cycling. IC Role / Device Role / Timing Role: Dual-function supervisor - uses MR for meter firmware update reset and watchdog for DSP algorithm hang detection during harmonic analysis. Use Value: Achieves IEC 62053-21 compliance via 140ms minimum reset hold time and 1.6s watchdog window, preventing erroneous energy accumulation during transient grid events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6321HPUK29CY-T | Active-high push/pull RESET output; same 2.93V threshold, 140ms timeout, 1.6s watchdog | Requires logic inversion or MCU reset pin compatibility with active-high assertion | Select when target microcontroller accepts active-high reset or board layout prohibits external pullup resistor |
| TLV809E29DBZR | No watchdog or manual reset; 2.93V threshold, 140ms timeout, open-drain output; lower supply current (0.5µA) | Lacks runtime fault detection capability - suitable only for power-monitor-only use cases | Choose for cost-sensitive, static-supply applications where software hang detection is unnecessary |
Compared with MAX6321HPUK29CY-T and TLV809E29DBZR, the MAX6320PUK29CY-T uniquely combines open-drain flexibility, integrated watchdog, and manual reset in a single AEC-Q100-qualified device - making it optimal for automotive and industrial systems requiring both power integrity and runtime supervision.
Availability
MAX6320PUK29CY-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical devices, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6320PUK29CY-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 high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and computing markets.
The MAX6316–MAX6322 family delivers compact, factory-trimmed supervisory circuits optimized for space-constrained embedded systems needing precise voltage monitoring, manual reset, and watchdog functionality without external components.
FAQ
What is the exact reset threshold voltage of MAX6320PUK29CY-T and how does it vary with temperature?
The MAX6320PUK29CY-T has a factory-trimmed nominal reset threshold of 2.93V at +25°C, with tolerance of ±2.5% over the full operating range of –40°C to +125°C. Its temperature coefficient is 40ppm/°C, resulting in maximum deviation of ±0.125V across temperature. This ensures reliable brownout detection in 3V systems without external calibration.
Does MAX6320PUK29CY-T require an external pullup resistor on the RESET pin, and what value is recommended?
Yes, MAX6320PUK29CY-T requires an external pullup resistor on the RESET pin because it features an open-drain NMOS output. A 10kΩ resistor to the target supply rail (up to 6V) is recommended for most applications, ensuring logic-high levels while limiting sink current to ≤3.2mA at 4.5V - per the device's VOL specification.
Can MAX6320PUK29CY-T operate reliably when the VCC supply drops below 2.0V?
Yes, MAX6320PUK29CY-T is guaranteed to assert valid reset states down to VCC = 1.0V, including proper RESET output voltage levels (VOL ≤ 0.4V at ISINK = 3.2mA) and functional watchdog/MR inputs. This makes it suitable for battery-powered systems experiencing deep discharge, unlike many supervisors that cease operation below 1.8V.
How is the watchdog timer in MAX6320PUK29CY-T disabled, and what happens when WDI is left unconnected?
The watchdog timer in MAX6320PUK29CY-T is disabled by leaving the WDI pin unconnected or three-stating the driving source. When floating, the internal watchdog counter generates low-high-low pulses at 7/8 of the nominal timeout period (1.4s), automatically servicing the timer and preventing reset assertion - enabling full watchdog functionality to be omitted without hardware modification.
Is MAX6320PUK29CY-T qualified for automotive applications, and what grade does it meet?
Yes, MAX6320PUK29CY-T is AEC-Q100 qualified for automotive applications. It meets Grade 3 requirements (–40°C to +125°C junction temperature), with testing covering accelerated environmental stress, ESD, latch-up, and reliability validation - confirming suitability for body electronics, infotainment, and ADAS subsystems outside the engine compartment.
MAX6320PUK29CY-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6320PUK29CY-T FAQ
1.How can I place an order for MAX6320PUK29CY-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6320PUK29CY-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 MAX6320PUK29CY-T reliable?
The price and inventory of MAX6320PUK29CY-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6320PUK29CY-T is usually 5 days.
3.What payment methods are accepted for MAX6320PUK29CY-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6320PUK29CY-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6320PUK29CY-T?
MAX6320PUK29CY-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6320PUK29CY-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 MAX6320PUK29CY-T?
For technical support, including MAX6320PUK29CY-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6320PUK29CY-T requirements.
6.How does Aetrix verify that MAX6320PUK29CY-T is sourced from the original manufacturer or authorized distributors?
All MAX6320PUK29CY-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 MAX6320PUK29CY-T meets industry standards.
7.What is the process for return or replacement of MAX6320PUK29CY-T?
All MAX6320PUK29CY-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6320PUK29CY-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 MAX6320PUK29CY-T part is unused and in its original packaging.
Return procedure for MAX6320PUK29CY-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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