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Analog Devices Inc. ADM8320WBX3NARJZR7
- Part No.:
- ADM8320WBX3NARJZR7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8320WBX3NARJZR7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,427
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Product details
Overview
ADM8320WBX3NARJZR7 from Analog Devices is a supervisory circuit with watchdog timer and manual reset, designed for microprocessor supply voltage monitoring in automotive and industrial systems. It features a 3.18 V reset threshold, 20 ms minimum reset timeout, 102 ms typical watchdog timeout, open-drain active-low RESET output, and operates across −40°C to +125°C.
For engineers reviewing the ADM8320WBX3NARJZR7 datasheet, ADM8320WBX3NARJZR7 pinout, ADM8320WBX3NARJZR7 application, or ADM8320WBX3NARJZR7 equivalent, this device supports robust power-on reset, brownout detection, code execution integrity monitoring via WDI strobing, and push-button initiated system recovery in safety-critical embedded environments.
Technical Context
The ADM8320WBX3NARJZR7 integrates a precision voltage monitor with factory-trimmed 3.18 V threshold (±1.5% over temperature), a programmable watchdog timer cleared by logic transitions on WDI, and a glitch-filtered manual reset input with 75 kΩ internal pull-up. Its open-drain RESET output requires an external pull-up and remains valid down to VCC = 0.9 V.
It implements undervoltage detection during power-up/down/brownout, asserts reset when VCC falls below 3.18 V or MR is pulled low, and triggers reset if WDI remains static beyond 102 ms (typical). Reset remains asserted for 20 ms after VCC rises above threshold or MR releases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.18 V ±1.5% over −40°C to +125°C - sets precise supply rail monitoring point for 3.3 V systems. |
| Reset Timeout | 20 ms minimum - ensures stable power-up before releasing microprocessor from reset. |
| Watchdog Timeout | 102 ms typical - provides responsive detection of firmware hangs without excessive sensitivity. |
| Supply Current | 10 µA at 3.6 V - enables integration into always-on, low-power automotive subsystems. |
| Operating Temp | −40°C to +125°C - qualified for under-hood and infotainment module deployment. |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and level-shifting with external pull-up. |
| WDI Input Threshold | 0.3×VCC / 0.7×VCC - compatible with standard CMOS logic interfaces across supply voltages. |
Pinout & Package
ADM8320WBX3NARJZR7 is housed in a 5-lead SOT-23 (RJ-5) package, measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives low to assert reset; requires external pull-up to VCC or another rail ≤ VCC; valid down to VCC = 0.9 V. |
| 2 - GND | Ground reference | Primary return path for internal circuitry and reset output sink current. |
| 3 - MR | Active-low manual reset input | Pulled high internally by 75 kΩ; accepts push-button switch to GND; 1 µs minimum pulse width; 100 ns glitch rejection. |
| 4 - WDI | Watchdog input | Clears watchdog timer on any logic transition; 50 ns minimum pulse width; disabled when floating. |
| 5 - VCC | Monitored supply voltage input | Input to internal voltage divider and regulator; operating range 0.9 V to 5.5 V; monitors 3.3 V rail at 3.18 V threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Qualified per AEC-Q100 Grade 1 (−40°C to +125°C) with controlled manufacturing flow. |
| Factory-trimmed reset threshold | 3.18 V with ±1.5% tolerance over full temperature range - eliminates external resistor calibration. |
| Glitch-immune manual reset | 100 ns noise rejection on MR pin plus integrated debounce - prevents spurious resets from EMI or switch bounce. |
| Low-power operation | 10 µA supply current at 3.6 V - extends battery life in always-on vehicle modules. |
| Valid reset output at low VCC | RESET remains functional down to VCC = 0.9 V - ensures reliable reset assertion during deep brownout conditions. |
Applications
| Automotive Infotainment | Engine Control Unit (ECU) |
|---|---|
Use Scenario: Power sequencing and fault recovery in head-unit main processor and display subsystems. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout detection, and watchdog-triggered recovery for ARM-based SoCs. Use Value: Ensures deterministic boot state after cold crank or load dump events; 3.18 V threshold matches 3.3 V I/O rail tolerance. |
Use Scenario: Monitoring 3.3 V sensor interface and communication rails in engine management modules. IC Role / Device Role / Timing Role: Voltage supervisor with manual reset for field-serviceable ECU reinitialization and watchdog-enforced firmware sanity checks. Use Value: 102 ms watchdog timeout balances responsiveness against false triggers from transient CAN bus noise. |
| Industrial PLC Controller | Telematics Control Unit (TCU) |
Use Scenario: Ensuring reliable startup and runtime integrity of dual-core microcontrollers in programmable logic controllers. IC Role / Device Role / Timing Role: Primary reset generator with open-drain output enabling shared reset bus across multiple ASICs/FPGAs. Use Value: Open-drain architecture allows safe reset line arbitration and compatibility with mixed-voltage backplane designs. |
Use Scenario: Managing power-up sequence and runtime health of LTE modem, GNSS receiver, and secure boot processor. IC Role / Device Role / Timing Role: Automotive-grade supervisor with MR input for remote diagnostics-initiated reset and WDI-driven firmware watchdog. Use Value: −40°C to +125°C operation and 20 ms reset timeout meet ISO 16750-4 transient immunity requirements for TCU mounting locations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3 V fixed reset threshold; push-pull output; no manual reset input. | Lacks MR pin and open-drain flexibility; suited for simpler reset-only use cases. | Select when only voltage monitoring is needed and board layout prohibits external pull-up. |
| MAX6326UT31D3+T | 3.08 V reset threshold; 200 ms reset timeout; no watchdog timer; push-pull output. | Provides basic reset without code-execution monitoring; higher reset timeout reduces sensitivity to supply ripple. | Choose where watchdog functionality is unnecessary and longer reset hold time improves noise immunity. |
Compared with TPS3808G33DBVR and MAX6326UT31D3+T, ADM8320WBX3NARJZR7 uniquely combines automotive qualification, open-drain output, manual reset, and configurable watchdog - making it optimal for complex, safety-aware microprocessor systems requiring multi-layer fault recovery.
Availability
ADM8320WBX3NARJZR7 is available at Aetrix Electronics and suitable for automotive infotainment, engine control units, and industrial PLC controllers requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for ADM8320WBX3NARJZR7 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
ADM8320WBX3NARJZR7 belongs to the ADM83xx family of automotive-qualified supervisory circuits, engineered specifically for robust power monitoring and firmware integrity assurance in harsh-temperature embedded control systems.
FAQ
What is the exact reset threshold voltage of ADM8320WBX3NARJZR7?
The ADM8320WBX3NARJZR7 has a factory-trimmed nominal reset threshold of 3.18 V, with tolerance of ±1.5% over the full operating temperature range of −40°C to +125°C. This value is confirmed in the Ordering Guide table on page 16 of the Rev. D datasheet and corresponds to reset threshold number "3N" in Table 9.
Does ADM8320WBX3NARJZR7 include a watchdog timer, and what is its timeout?
Yes, ADM8320WBX3NARJZR7 includes a watchdog timer with a typical timeout of 102 ms, corresponding to option "X" in Table 8. The minimum and maximum values are 72 ms and 132 ms respectively, and the timer is cleared by any logic transition on the WDI pin.
What type of reset output does ADM8320WBX3NARJZR7 provide, and how is it used?
ADM8320WBX3NARJZR7 provides an active-low open-drain RESET output (Pin 1). It requires an external pull-up resistor to VCC or another compatible rail. This configuration enables wired-OR reset busing and level translation, and the output remains valid down to VCC = 0.9 V.
Is ADM8320WBX3NARJZR7 qualified for automotive applications?
Yes, ADM8320WBX3NARJZR7 is explicitly qualified for automotive use: the "W" suffix denotes AEC-Q100 Grade 1 qualification (−40°C to +125°C), and the datasheet states it is "Qualified for automotive applications" with controlled manufacturing flow per the Automotive Products section on page 16.
What are the key timing parameters for manual reset on ADM8320WBX3NARJZR7?
ADM8320WBX3NARJZR7 specifies a 1 µs minimum MR input pulse width, 100 ns glitch rejection, and 350 ns MR-to-reset propagation delay at VCC = 5 V. The MR pin features a 75 kΩ internal pull-up resistor, allowing direct connection of a push-button switch to ground without external components.
ADM8320WBX3NARJZR7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.18V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM8320WBX3NARJZR7 FAQ
1.How can I place an order for ADM8320WBX3NARJZR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8320WBX3NARJZR7 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 ADM8320WBX3NARJZR7 reliable?
The price and inventory of ADM8320WBX3NARJZR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8320WBX3NARJZR7 is usually 5 days.
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ADM8320WBX3NARJZR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
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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 ADM8320WBX3NARJZR7?
For technical support, including ADM8320WBX3NARJZR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8320WBX3NARJZR7 requirements.
6.How does Aetrix verify that ADM8320WBX3NARJZR7 is sourced from the original manufacturer or authorized distributors?
All ADM8320WBX3NARJZR7 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 ADM8320WBX3NARJZR7 meets industry standards.
7.What is the process for return or replacement of ADM8320WBX3NARJZR7?
All ADM8320WBX3NARJZR7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8320WBX3NARJZR7, 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 ADM8320WBX3NARJZR7 part is unused and in its original packaging.
Return procedure for ADM8320WBX3NARJZR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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