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Analog Devices Inc. ADM8320WCZ33ARJZR7
- Part No.:
- ADM8320WCZ33ARJZR7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8320WCZ33ARJZR7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,816
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Product details
Overview
ADM8320WCZ33ARJZR7 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 3.3 V reset threshold (±1.5% over −40°C to +125°C), 140 ms minimum reset timeout, 25.6 sec typical watchdog timeout, open-drain active-low RESET output, and operates from 0.9 V to 5.5 V with only 10 µA supply current.
For engineers reviewing the ADM8320WCZ33ARJZR7 datasheet, ADM8320WCZ33ARJZR7 pinout, ADM8320WCZ33ARJZR7 application, or ADM8320WCZ33ARJZR7 equivalent, key selection considerations include its automotive qualification (−40°C to +125°C), open-drain reset architecture requiring external pull-up, watchdog timeout compatibility with long-loop firmware, and manual reset input with 75 kΩ internal pull-up.
Technical Context
The ADM8320WCZ33ARJZR7 integrates a precision voltage monitor, programmable watchdog timer, and manual reset input within a single 5-lead SOT-23 package. Its reset threshold is factory-trimmed to 3.3 V with ±1.5% tolerance across temperature, and it asserts reset when VCC falls below this level, when MR is pulled low, or when WDI fails to toggle within 25.6 sec.
It uses an open-drain RESET output stage compatible with mixed-voltage systems, supports glitch rejection on MR (100 ns), and clears the watchdog timer on any logic transition at WDI (≥50 ns pulse width). The device guarantees valid reset assertion down to VCC = 0.9 V and includes internal 75 kΩ MR pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.3 V ±1.5% (−40°C to +125°C); ensures reliable brownout detection for 3.3 V logic rails |
| Reset Timeout | 140 ms minimum; provides sufficient hold time for processor initialization after power stabilization |
| Watchdog Timeout | 25.6 sec typical; supports long-duration firmware tasks without spurious resets |
| Supply Current | 10 µA at 5.5 V; enables use in always-on, battery-backed subsystems |
| Operating Temp | −40°C to +125°C; qualified for under-hood automotive and harsh industrial environments |
| Output Type | Open-drain active-low RESET; allows wired-OR configuration and voltage-level translation |
| MR Input | Active-low with 75 kΩ internal pull-up; eliminates need for external resistor in push-button reset circuits |
Pinout & Package
ADM8320WCZ33ARJZR7 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 | Requires external pull-up; sinks ≥1.2 mA at VCC ≥ 2.7 V; valid down to VCC = 0.9 V |
| 2 - GND | Ground reference | Common return path for all internal circuits and external reset load |
| 3 - MR | Manual reset input | Active-low; internally pulled up to VCC via 75 kΩ; 350 ns delay to RESET assertion |
| 4 - WDI | Watchdog input | Edge-sensitive; clears watchdog timer on any transition; 50 ns minimum pulse width supported |
| 5 - VCC | Supply voltage input | Monitored rail; operating range 0.9 V to 5.5 V; reset asserted when below 3.3 V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Qualified per AEC-Q100 Grade 1; controlled manufacturing for reliability in infotainment and ADAS modules |
| Factory-trimmed reset threshold | 3.3 V with ±1.5% tolerance over full temperature range-no external resistor network required |
| Glitch-immune manual reset | 100 ns MR input noise rejection; integrated debounce eliminates need for external RC filter |
| Low-power watchdog operation | 10 µA quiescent current enables continuous supervision in energy-constrained systems |
| Open-drain output flexibility | Supports mixed-voltage reset buses (e.g., 3.3 V supervisor driving 1.8 V processor RESET) |
Applications
| Automotive Infotainment | Industrial PLC Controller |
|---|---|
|
Use Scenario: Reset management for head-unit SoC during cold cranking or battery voltage sag. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to SoC when 3.3 V domain drops below 3.3 V threshold. Use Value: Prevents corrupted boot sequences by holding reset for 140 ms minimum after voltage recovery, ensuring stable clock and memory initialization. |
Use Scenario: Ensuring deterministic restart of programmable logic controller CPU after brownout. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcing safe state recovery when main 3.3 V rail dips transiently. Use Value: 25.6 sec watchdog timeout accommodates extended I/O scan cycles while guaranteeing recovery if firmware hangs. |
| Medical Diagnostic Equipment | Telematics Control Unit (TCU) |
|
Use Scenario: Power sequencing and fault recovery in portable ultrasound imaging module. IC Role / Device Role / Timing Role: Dual-role supervisor providing both VCC monitoring and manual reset via front-panel button. Use Value: Internal 75 kΩ MR pull-up simplifies BOM; open-drain RESET interfaces cleanly with isolated reset domain of FPGA-based image processor. |
Use Scenario: Reliable restart of cellular modem and GNSS receiver after vehicle ignition cycle. IC Role / Device Role / Timing Role: Automotive-grade watchdog supervisor detecting firmware lockup in LTE/NR protocol stack. Use Value: −40°C to +125°C operation ensures functionality in engine bay–mounted TCU; RoHS-compliant (Z suffix) meets automotive compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM8320WCY29ARJZR7 | 2.93 V reset threshold, same 140 ms reset timeout and 25.6 sec watchdog timeout | Targeted at 3.0 V system rails instead of 3.3 V; identical pinout and timing behavior | Select when monitoring 3.0 V supplies with tighter margin; otherwise functionally interchangeable in layout |
| TPS3808G33DBVR | 3.3 V reset threshold, 200 ms reset delay, no watchdog timer, push-pull output | Lacks watchdog capability; requires external pull-up for open-drain interface emulation | Choose only if watchdog functionality is unnecessary and board space permits redesign for push-pull drive |
Compared with ADM8320WCZ33ARJZR7, ADM8320WCY29ARJZR7 offers identical timing and interface but targets lower supply rails, while TPS3808G33DBVR omits watchdog support entirely-making it unsuitable for systems requiring code-execution integrity monitoring.
Availability
ADM8320WCZ33ARJZR7 is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC controllers, and telematics control units requiring stable component supply with guaranteed automotive-grade reliability and long-term lifecycle support.
Supply support for ADM8320WCZ33ARJZR7 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, headquartered in Wilmington, MA.
The ADM8320 series belongs to Analog Devices' automotive-qualified supervisory IC product line, engineered specifically for robust power-up, brownout, and software-fault recovery in safety-critical embedded systems.
FAQ
What is the reset threshold voltage of ADM8320WCZ33ARJZR7?
The ADM8320WCZ33ARJZR7 has a factory-trimmed nominal reset threshold of 3.3 V, with tolerance of ±1.5% over the full operating temperature range (−40°C to +125°C). This ensures precise undervoltage detection for 3.3 V power domains without external calibration components.
Does ADM8320WCZ33ARJZR7 include a watchdog timer?
Yes, ADM8320WCZ33ARJZR7 includes a watchdog timer with a typical timeout of 25.6 seconds. It monitors the WDI pin for logic transitions and asserts RESET if no edge occurs within that period-providing critical recovery from firmware lockups in automotive and industrial applications.
What type of reset output does ADM8320WCZ33ARJZR7 provide?
ADM8320WCZ33ARJZR7 provides an active-low open-drain RESET output (Pin 1). This requires an external pull-up resistor and enables flexible interfacing with processors operating at different voltage levels, including mixed-voltage reset buses.
Is ADM8320WCZ33ARJZR7 qualified for automotive use?
Yes, ADM8320WCZ33ARJZR7 is automotive-qualified (denoted by 'W' in the part number) and meets AEC-Q100 Grade 1 requirements. It is manufactured under controlled processes and specified over −40°C to +125°C for use in infotainment, telematics, and other automotive electronic modules.
What is the function of the MR pin on ADM8320WCZ33ARJZR7?
The MR (Manual Reset) pin on ADM8320WCZ33ARJZR7 is an active-low input with a built-in 75 kΩ pull-up resistor. Driving MR low-for example, via a front-panel push-button-forces a reset pulse with 350 ns propagation delay, enabling user-initiated system recovery without external components.
ADM8320WCZ33ARJZR7 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:
- 3.3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM8320WCZ33ARJZR7 FAQ
1.How can I place an order for ADM8320WCZ33ARJZR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8320WCZ33ARJZR7 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 ADM8320WCZ33ARJZR7 reliable?
The price and inventory of ADM8320WCZ33ARJZR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8320WCZ33ARJZR7 is usually 5 days.
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ADM8320WCZ33ARJZR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8320WCZ33ARJZR7 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 ADM8320WCZ33ARJZR7?
For technical support, including ADM8320WCZ33ARJZR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8320WCZ33ARJZR7 requirements.
6.How does Aetrix verify that ADM8320WCZ33ARJZR7 is sourced from the original manufacturer or authorized distributors?
All ADM8320WCZ33ARJZR7 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 ADM8320WCZ33ARJZR7 meets industry standards.
7.What is the process for return or replacement of ADM8320WCZ33ARJZR7?
All ADM8320WCZ33ARJZR7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8320WCZ33ARJZR7, 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 ADM8320WCZ33ARJZR7 part is unused and in its original packaging.
Return procedure for ADM8320WCZ33ARJZR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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