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Analog Devices Inc. ADM8321WAW30ARJZR7
- Part No.:
- ADM8321WAW30ARJZR7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8321WAW30ARJZR7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,968
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Product details
Overview
ADM8321WAW30ARJZR7 from Analog Devices is an automotive-qualified supervisory circuit with watchdog timer and manual reset input, featuring a 3.0 V reset threshold, 1 ms minimum reset timeout, and 6.3 ms typical watchdog timeout. It provides active-low open-drain RESET output and active-high push-pull RESET output for dual-signaling microprocessor systems in harsh environments.
For engineers reviewing the ADM8321WAW30ARJZR7 datasheet, ADM8321WAW30ARJZR7 pinout, ADM8321WAW30ARJZR7 application, or ADM8321WAW30ARJZR7 equivalent, this device supports critical power-on reset sequencing, brownout detection, and code-execution integrity monitoring in automotive infotainment and engine control units requiring −40°C to +125°C operation and AEC-Q100 alignment.
Technical Context
The ADM8321WAW30ARJZR7 integrates a precision voltage monitor with ±1.5% threshold accuracy over −40°C to +125°C, a glitch-filtered manual reset input (MR) with 75 kΩ internal pull-up, and a watchdog timer cleared by WDI transitions ≥50 ns. Its dual-reset outputs enable simultaneous compatibility with legacy active-low and modern active-high microcontroller reset inputs.
This variant uses open-drain RESET (pin 1) for level-shiftable assertion and push-pull RESET (pin 3) for rail-to-rail drive strength, both guaranteed functional down to VCC = 0.9 V. The watchdog timeout of 6.3 ms (typical) and reset timeout of 1 ms (minimum) are factory-trimmed and temperature-stable (20 ppm/°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.0 V ±1.5% over −40°C to +125°C - ensures reliable brownout detection at nominal 3.3 V supply rails |
| Reset Timeout | 1 ms minimum - guarantees sufficient hold time for microprocessor initialization after power stabilization |
| Watchdog Timeout | 6.3 ms typical - enables fast fault recovery for real-time safety-critical firmware loops |
| Supply Current | 10 µA at 3.6 V - supports always-on monitoring in battery-backed automotive modules |
| Operating Temp | −40°C to +125°C - qualified for under-hood and infotainment applications per AEC-Q100 |
| Output Types | Open-drain RESET (pin 1) + push-pull RESET (pin 3) - allows mixed-signal reset interface design |
| VCC Range | 0.9 V to 5.5 V - maintains valid reset signaling during deep brownout conditions |
Pinout & Package
ADM8321WAW30ARJZR7 is housed in a 5-lead SOT-23 (RJ-5) package with 0.95 mm pitch, compatible with standard reflow profiles and IPC-7351B footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset output requiring external pull-up; sinks 1.2 mA at VCC ≥ 2.7 V |
| 2 | GND | Ground reference for all internal comparators and logic |
| 3 | RESET (push-pull) | Active-high reset output; sources 500 µA at VCC ≥ 2.7 V, valid down to VCC = 0.9 V |
| 4 | WDI | Watchdog input; toggled by MCU to prevent timeout; 50 ns pulse detection; 35–100 µA input current |
| 5 | VCC | Monitored supply rail; device asserts reset when VCC falls below 3.0 V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous open-drain low and push-pull high assertion eliminates need for external level translators |
| Automotive qualification | AEC-Q100 Grade 1 compliance with controlled manufacturing flow and extended reliability reporting |
| Factory-trimmed 3.0 V threshold | ±1% tolerance at 25°C, ±1.5% over full temperature range - reduces BOM count vs. adjustable supervisors |
| Glitch-immune MR input | 100 ns noise rejection and integrated debounce - enables direct connection to mechanical switches without RC filters |
| Low-power watchdog operation | 6.3 ms timeout option minimizes current draw while enabling rapid fault response in safety-critical firmware |
Applications
| Automotive Infotainment | Engine Control Unit (ECU) |
|---|---|
Use Scenario: Power sequencing and runtime watchdog supervision for head-unit SoCs operating in vehicles with wide ambient temperature swings and noisy 12 V battery supplies. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, manual reset via service button, and 6.3 ms watchdog timeout to recover from frozen display drivers or audio codecs. Use Value: Prevents unresponsive UI lockups by forcing hard reset within 6.3 ms of WDI stall, meeting ISO 26262 ASIL-B diagnostic coverage requirements for non-safety-critical subsystems. |
Use Scenario: Monitoring 5 V and 3.3 V rails in diesel ECU modules exposed to under-hood temperatures up to +125°C and conducted transients. IC Role / Device Role / Timing Role: Dual-output supervisor asserting both active-low and active-high reset signals to legacy and modern MCUs during cold cranking (VCC dip to 2.8 V). Use Value: Ensures deterministic reset behavior across voltage domains using one device - eliminates timing skew between separate reset ICs and reduces PCB area by 35%. |
| Advanced Driver Assistance Systems (ADAS) | Telematics Control Unit (TCU) |
Use Scenario: Runtime integrity checking of radar processor firmware in forward collision warning modules where missed watchdog strobes indicate sensor fusion failure. IC Role / Device Role / Timing Role: Watchdog supervisor with 6.3 ms timeout interfacing to ARM Cortex-R5F core; MR input tied to diagnostic service port. Use Value: Enables sub-10 ms fault containment interval (FCI), satisfying ASIL-B timing constraints for driver assistance functions without adding FPGA-based timers. |
Use Scenario: Always-on monitoring of LTE modem power rails in cellular-connected TCUs powered by vehicle battery with periodic sleep/wake cycles. IC Role / Device Role / Timing Role: Low-current (10 µA) supervisor maintaining valid reset signaling during 3.6 V standby mode and asserting on 3.0 V brownout. Use Value: Extends battery life in parked state by >12 months versus higher-quiescent alternatives, while guaranteeing clean boot on wake-up via 1 ms reset timeout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G30DBVR | Single active-low push-pull output; no dual-output capability; 3.0 V threshold with 0.5% initial accuracy | Lacks open-drain output for level shifting; requires external buffer for active-high reset | Select when only one reset polarity is needed and tighter initial threshold tolerance is prioritized over dual signaling |
| MAX6326UT30D3T | Open-drain only; no push-pull output; 3.0 V threshold with ±2.5% over temperature; 140 ms reset timeout default | Cannot drive active-high reset directly; longer reset timeout limits use in fast-boot systems | Select for cost-sensitive body electronics where dual outputs and sub-10 ms watchdog are not required |
Compared with TPS3808G30DBVR and MAX6326UT30D3T, ADM8321WAW30ARJZR7 uniquely delivers concurrent open-drain and push-pull reset outputs in a single 5-pin SOT-23, enabling compact dual-polarity reset architectures without external components while meeting automotive temperature and reliability requirements.
Availability
ADM8321WAW30ARJZR7 is available at Aetrix Electronics and suitable for automotive infotainment, engine control units, and ADAS applications requiring stable component supply, AEC-Q100 qualification, and −40°C to +125°C operational integrity.
Supply support for ADM8321WAW30ARJZR7 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 since 1965.
The ADM83xx family was designed specifically for automotive and industrial microprocessor supervision, emphasizing precision voltage monitoring, robust watchdog timing, and dual-output flexibility in minimal 5-lead SOT-23 packaging.
FAQ
What is the reset threshold voltage of ADM8321WAW30ARJZR7 and how stable is it over temperature?
The ADM8321WAW30ARJZR7 has a factory-trimmed reset threshold of 3.0 V with ±1% accuracy at 25°C and ±1.5% over −40°C to +125°C. Its temperature coefficient is 20 ppm/°C, ensuring minimal drift across automotive operating ranges. This stability eliminates need for external calibration in systems where precise brownout detection at 3.0 V is required.
Does ADM8321WAW30ARJZR7 support both active-low and active-high reset signaling simultaneously?
Yes, ADM8321WAW30ARJZR7 provides two independent reset outputs: pin 1 is active-low open-drain RESET, and pin 3 is active-high push-pull RESET. This dual-output architecture allows direct interface to microcontrollers requiring either polarity without external inverters or level shifters, reducing bill-of-materials and layout complexity.
What watchdog timeout options are available for ADM8321WAW30ARJZR7 and how is it configured?
The ADM8321WAW30ARJZR7 variant uses the "W" watchdog timeout option, delivering 6.3 ms typical timeout (4.5 ms min, 8.1 ms max). Configuration is fixed at manufacture via internal trimming - no external resistors or pins are used. The watchdog timer resets on any WDI transition (low-to-high or high-to-low) with ≥50 ns pulse width.
Is ADM8321WAW30ARJZR7 qualified for automotive applications and what does the "W" suffix signify?
Yes, the "W" in ADM8321WAW30ARJZR7 indicates automotive qualification per AEC-Q100 Grade 1 (−40°C to +125°C), including controlled manufacturing, enhanced reliability testing, and automotive-specific failure analysis. It is intended for under-hood and cabin applications where long-term stability and transient immunity are mandatory.
What is the minimum reset timeout for ADM8321WAW30ARJZR7 and why is it important for fast-boot systems?
The ADM8321WAW30ARJZR7 has a 1 ms minimum reset timeout (Option A), ensuring the reset signal remains asserted long enough for microprocessors with short initialization sequences - such as ARM Cortex-M7 cores in ADAS domain controllers - to complete power-on self-test and register setup before release. This prevents premature execution in unstable voltage conditions.
ADM8321WAW30ARJZR7 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:
- 3V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM8321WAW30ARJZR7 FAQ
1.How can I place an order for ADM8321WAW30ARJZR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8321WAW30ARJZR7 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 ADM8321WAW30ARJZR7 reliable?
The price and inventory of ADM8321WAW30ARJZR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8321WAW30ARJZR7 is usually 5 days.
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ADM8321WAW30ARJZR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8321WAW30ARJZR7 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 ADM8321WAW30ARJZR7?
For technical support, including ADM8321WAW30ARJZR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8321WAW30ARJZR7 requirements.
6.How does Aetrix verify that ADM8321WAW30ARJZR7 is sourced from the original manufacturer or authorized distributors?
All ADM8321WAW30ARJZR7 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 ADM8321WAW30ARJZR7 meets industry standards.
7.What is the process for return or replacement of ADM8321WAW30ARJZR7?
All ADM8321WAW30ARJZR7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8321WAW30ARJZR7, 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 ADM8321WAW30ARJZR7 part is unused and in its original packaging.
Return procedure for ADM8321WAW30ARJZR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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