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Analog Devices Inc./Maxim Integrated MAX6320PUK33BX+
- Part No.:
- MAX6320PUK33BX+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6320PUK33BX+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,966
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Product details
Overview
MAX6320PUK33BX+ from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with open-drain active-low reset output, 3.3V factory-trimmed reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity, provides manual reset input, and asserts reset during power-up, brownout, or software hang in embedded control systems.
For engineers reviewing the MAX6320PUK33BX+ datasheet, MAX6320PUK33BX+ pinout, MAX6320PUK33BX+ application, or MAX6320PUK33BX+ equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), open-drain output compatible with mixed-voltage reset buses up to 6V, and AEC-Q100 qualification for automotive use.
Technical Context
The MAX6320PUK33BX+ implements a voltage-monitoring comparator with factory-trimmed 3.3V threshold (2.5% tolerance over full temperature range), a 140ms reset timeout timer, and a 1.6s watchdog timer cleared by WDI edge transitions. Its open-drain RESET output requires an external pullup resistor and supports level-shifting across supply domains.
It features a manual reset (MR) input with internal 52kΩ pullup, glitch rejection of 100ns, and MR-to-reset propagation delay of 230ns at VCC = 5V. The WDI input accepts pulses as short as 50ns and draws ≤160µA average current when actively driven high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.3V ±2.5% over -40°C to +125°C - ensures reliable power-on reset for 3.3V logic systems |
| Reset Timeout | 140ms minimum - guarantees sufficient hold time for microprocessor initialization |
| Watchdog Timeout | 1.6s typical - provides robust software execution monitoring without excessive false triggers |
| Supply Current | 5µA typical at VCC = 3.6V - enables ultra-low-power operation in battery-backed systems |
| Operating Voltage | 1.0V to 5.5V - allows valid reset assertion even during deep brownout conditions |
| RESET Output Type | Open-drain, active-low - supports wired-OR reset buses and level translation up to 6V |
| Temperature Range | -40°C to +125°C - qualified for automotive and industrial environments |
Pinout & Package
MAX6320PUK33BX+ is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead(Pb)-free, with thermal pad omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output - requires external pullup; sinks current only; compatible with 1.8V–6V bus voltages |
| 2 | GND | Ground reference - common return path for all internal circuitry and reset timing |
| 3 | MR | Manual reset input - active-low; internally pulled up to VCC via 52kΩ; rejects 100ns glitches |
| 4 | WDI | Watchdog input - edge-sensitive; clears watchdog timer on rising or falling transition; tolerates 50ns pulses |
| 5 | VCC | Supply input - monitored voltage rail; reset asserted when VCC falls below 3.3V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.3V threshold | Eliminates external resistor divider; achieves ±2.5% accuracy over full automotive temperature range |
| Open-drain RESET with 0.4V VOL @ 3.2mA | Ensures solid logic-low assertion into heavy capacitive loads or multiple devices on shared reset bus |
| Guaranteed operation down to VCC = 1V | Provides valid reset signaling during severe brownout, preventing undefined microprocessor behavior |
| Immunity to <4µs negative VCC transients | Prevents spurious resets from EMI or switching noise without requiring additional filtering components |
| AEC-Q100 qualified | Validated for automotive applications including engine control, body electronics, and ADAS subsystems |
Applications
| Industrial PLC Control | Automotive Body Controller |
|---|---|
Use Scenario: Supervises 3.3V MCU in programmable logic controller exposed to wide ambient temperature swings and conducted EMI. IC Role / Device Role / Timing Role: Monitors VCC, detects software lockup via WDI, and forces hard reset using open-drain output tied to shared reset bus with I/O expanders and CAN transceivers. Use Value: Prevents system freeze during voltage sags; 140ms timeout ensures full MCU register initialization; AEC-Q100 rating supports under-hood deployment. | Use Scenario: Embedded in door module controlling window lift, mirror fold, and interior lighting powered from vehicle battery (9–16V). IC Role / Device Role / Timing Role: Provides brownout detection on local 3.3V LDO output, manual reset for service mode entry, and watchdog supervision of firmware state machine. Use Value: Open-drain RESET interfaces directly to 5V-compatible microcontroller reset pin; 1.6s watchdog interval balances fault coverage and false trigger avoidance in low-duty-cycle polling loops. |
| Portable Medical Monitor | Smart Energy Meter |
Use Scenario: Battery-powered handheld device with ARM Cortex-M3 MCU, operating from 3.3V supply derived from Li-ion cell. IC Role / Device Role / Timing Role: Ensures safe boot after cold start or low-battery recovery; MR pin used for user-initiated calibration reset; WDI toggled by heartbeat task. Use Value: 5µA typical supply current extends battery life; 3.3V threshold matches system rail; reset validity to 1V prevents erratic behavior during deep discharge. | Use Scenario: DIN-rail mounted meter with isolated RS-485 interface, real-time clock, and metrology ASIC, powered from AC/DC converter. IC Role / Device Role / Timing Role: Supervises primary 3.3V domain; open-drain RESET pulled up to isolated 3.3V rail to avoid ground loop issues; MR used for firmware update reset sequence. Use Value: Level-shift capability enables clean reset isolation between primary and communication domains; 100ns MR glitch rejection suppresses noise from relay switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6320PUK33DZ+ | Same 3.3V threshold and SOT23 package, but 25.6s watchdog timeout instead of 1.6s | Suitable for systems requiring longer software execution windows before watchdog timeout | Select MAX6320PUK33DZ+ only if extended watchdog interval is required; otherwise MAX6320PUK33BX+ provides optimal balance for real-time firmware |
| TPS3808G33DBVR | 3.3V threshold, push-pull active-low reset, 200ms reset timeout, no manual reset input | Lacks MR pin and watchdog; simpler function set for basic power monitoring only | Choose TPS3808G33DBVR when watchdog and manual reset are unnecessary; MAX6320PUK33BX+ retains full feature set for complex embedded systems |
Compared with MAX6320PUK33DZ+, MAX6320PUK33BX+ offers tighter watchdog response for time-critical firmware; compared with TPS3808G33DBVR, it adds essential MR and watchdog functionality while maintaining identical threshold accuracy and open-drain flexibility.
Availability
MAX6320PUK33BX+ is available at Aetrix Electronics and suitable for industrial PLC control, automotive body controllers, portable medical monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6320PUK33BX+ 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, automotive, and communications applications.
The MAX6316–MAX6322 family delivers highly integrated μP supervisory circuits with configurable reset thresholds, watchdog timers, and multiple reset output types - engineered specifically for reliability-critical embedded systems where power integrity and software robustness are paramount.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6320PUK33BX+?
The MAX6320PUK33BX+ has a factory-trimmed nominal reset threshold of 3.3V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +125°C. At +25°C, the threshold is specified as 3.251V (min) to 3.350V (max). This tight tolerance eliminates need for external calibration and ensures consistent power-on reset behavior across environmental stress.
Does MAX6320PUK33BX+ support manual reset functionality?
Yes, MAX6320PUK33BX+ includes a dedicated MR (manual reset) input on Pin 3. It is active-low, internally pulled up to VCC via a 52kΩ resistor, and rejects glitches as short as 100ns. When pulled low, it forces reset for the full 140ms timeout period. This enables user-triggered reinitialization, service-mode entry, or field recovery without requiring external components.
What is the watchdog timeout period of MAX6320PUK33BX+ and how is it configured?
The MAX6320PUK33BX+ features a fixed 1.6s typical watchdog timeout period, factory-programmed via the 'Y' suffix in its ordering code. The watchdog timer is cleared by any edge (rising or falling) on the WDI pin and automatically resets if no transition occurs within 1.6s. No external configuration is needed - the timing is trimmed during manufacturing and remains stable across temperature and voltage.
Can MAX6320PUK33BX+ be used in automotive applications?
Yes, MAX6320PUK33BX+ is AEC-Q100 qualified and rated for operation from -40°C to +125°C. Its design includes immunity to short negative VCC transients (<4µs), guaranteed reset validity down to VCC = 1V, and robust MR and WDI input structures - all validated for automotive environments such as body control modules, telematics units, and ADAS sensor hubs.
What external components are required for MAX6320PUK33BX+ operation?
MAX6320PUK33BX+ requires only one external component: a pullup resistor on the open-drain RESET pin (Pin 1). A 10kΩ resistor to any supply up to 6V is sufficient for most applications. No external capacitors, resistors, or diodes are needed for basic supervision - the reset threshold, timeout periods, and watchdog are all factory-programmed and self-contained.
MAX6320PUK33BX+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6320PUK33BX+ FAQ
1.How can I place an order for MAX6320PUK33BX+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6320PUK33BX+ 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 MAX6320PUK33BX+ reliable?
The price and inventory of MAX6320PUK33BX+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6320PUK33BX+ is usually 5 days.
3.What payment methods are accepted for MAX6320PUK33BX+?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6320PUK33BX+?
MAX6320PUK33BX+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6320PUK33BX+ 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 MAX6320PUK33BX+?
For technical support, including MAX6320PUK33BX+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6320PUK33BX+ requirements.
6.How does Aetrix verify that MAX6320PUK33BX+ is sourced from the original manufacturer or authorized distributors?
All MAX6320PUK33BX+ 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 MAX6320PUK33BX+ meets industry standards.
7.What is the process for return or replacement of MAX6320PUK33BX+?
All MAX6320PUK33BX+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6320PUK33BX+, 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 MAX6320PUK33BX+ part is unused and in its original packaging.
Return procedure for MAX6320PUK33BX+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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