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Analog Devices Inc. ADM8321WCY46ARJZR7
- Part No.:
- ADM8321WCY46ARJZR7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8321WCY46ARJZR7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,879
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Product details
Overview
ADM8321WCY46ARJZR7 from Analog Devices is a supervisory circuit with watchdog timer and manual reset input, designed for microprocessor voltage monitoring and code execution integrity assurance. It features a 4.63 V reset threshold, 140 ms minimum reset timeout, 1.6 sec typical watchdog timeout, open-drain active-low RESET output, and operates across −40°C to +125°C - used in automotive infotainment and engine control units.
For engineers reviewing the ADM8321WCY46ARJZR7 datasheet, ADM8321WCY46ARJZR7 pinout, ADM8321WCY46ARJZR7 application, or ADM8321WCY46ARJZR7 equivalent, key selection considerations include its automotive-qualified SOT-23-5 package, open-drain reset output requiring external pull-up, integrated 75 kΩ MR pull-up resistor, and compatibility with systems needing brownout detection and watchdog-based recovery in harsh environments.
Technical Context
The ADM8321WCY46ARJZR7 implements a precision voltage monitor with factory-trimmed 4.63 V reset threshold (±1.5% over −40°C to +125°C), 140 ms minimum reset timeout, and 1.6 sec typical watchdog timeout. Its watchdog input (WDI) responds to logic transitions ≥50 ns and clears on any edge or undervoltage reset assertion.
This device integrates an open-drain active-low RESET output and push-pull active-high RESET output, enabling dual-signaling capability. The manual reset (MR) input includes 100 ns glitch rejection, 350 ns MR-to-reset delay at 5 V, and internal 75 kΩ pull-up - supporting robust external push-button reset without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V ±1.5% over −40°C to +125°C - ensures reliable brownout detection for 5 V rail systems |
| Reset Timeout | 140 ms minimum - guarantees sufficient hold time for processor initialization after power stabilization |
| Watchdog Timeout | 1.6 sec typical - balances fault detection latency and software servicing overhead in real-time firmware |
| Supply Current | 10 µA at 5.5 V - enables use in always-on automotive modules without battery drain concerns |
| Operating Temp | −40°C to +125°C - qualified for under-hood and infotainment applications per AEC-Q100 requirements |
| Output Types | Open-drain active-low RESET + push-pull active-high RESET - supports mixed-voltage system interfacing |
| WDI Pulse Width | 50 ns minimum - allows low-overhead watchdog strobing even in high-speed MCU contexts |
Pinout & Package
ADM8321WCY46ARJZR7 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 output requiring external pull-up; sinks ≥1.2 mA at VCC ≥2.7 V; valid down to VCC = 0.9 V |
| 2 | GND | Ground reference for all internal comparators, timers, and output stages |
| 3 | RESET (active-high) | Push-pull output sourcing ≥500 µA at VCC ≥2.7 V; VOH ≥0.9×VCC; valid down to VCC = 0.9 V |
| 4 | WDI | Watchdog input accepting 50 ns pulses; VIH = 0.7×VCC, VIL = 0.3×VCC; draws ≤100 µA when driven high |
| 5 | VCC | Monitored supply input; device operates from 0.9 V to 5.5 V; asserts reset below 4.63 V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | W-suffix device manufactured under controlled automotive process flow; supports AEC-Q100 stress testing |
| Dual reset outputs | Simultaneous open-drain low and push-pull high RESET signals eliminate need for external level-shifting or inverters |
| Integrated MR pull-up | 75 kΩ internal resistor on MR pin enables direct connection of momentary switch to ground - no external component required |
| Glitch-immune MR | 100 ns noise rejection on manual reset input prevents spurious resets from EMI or contact bounce in vehicle environments |
| Wide VCC range | Operates from 0.9 V to 5.5 V - supports reset assertion during deep brownout and maintains functionality through cold-crank conditions |
Applications
| Automotive Infotainment | Engine Control Unit (ECU) |
|---|---|
Use Scenario: Reset management in head-unit SoCs during ignition cycling and CAN bus wake-up sequences. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and watchdog-triggered recovery for ARM-based application processors. Use Value: Ensures deterministic boot state after voltage transients; 1.6 sec watchdog timeout aligns with firmware safety monitor intervals in ASIL-B designs. |
Use Scenario: Fault-tolerant reset generation in diesel ECU microcontrollers exposed to load-dump and cold-crank events. IC Role / Device Role / Timing Role: Dual-output supervisor delivering both active-low and active-high reset signals compatible with legacy and modern MCU families. Use Value: Open-drain RESET interfaces with 3.3 V logic while push-pull RESET drives 5 V-compatible peripherals - eliminating external translators. |
| Industrial PLC Controller | Telematics Control Unit (TCU) |
Use Scenario: Reliable restart coordination in programmable logic controllers subjected to 24 V supply fluctuations and ESD events. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcer ensuring firmware integrity during extended runtime and communication interruptions. Use Value: 140 ms reset timeout exceeds typical FPGA configuration times; −40°C to +125°C rating supports operation in unventilated enclosures. |
Use Scenario: Secure boot supervision in cellular-connected TCUs where modem and application processor must synchronize reset states. IC Role / Device Role / Timing Role: Dual-signaling supervisor enabling coordinated reset assertion across LTE modem, GNSS receiver, and application SoC. Use Value: Internal 75 kΩ MR pull-up simplifies board layout for remote reset via CAN message; low 10 µA quiescent current extends battery backup duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM8320WCY29ARJZR7 | Same pinout and dual-output architecture, but 2.93 V reset threshold and 140 ms/1.6 sec timing - no manual reset input | Used where only watchdog and voltage monitoring are needed, not user-initiated reset | Select when MR functionality is unnecessary and lower reset threshold suits 3.3 V systems |
| TPS3808G33DBVR | Single active-low open-drain reset; 3.3 V threshold; 200 ms timeout; no watchdog or dual outputs | Targeted at cost-sensitive, non-automotive embedded systems without watchdog requirements | Choose only if dual outputs, MR, and automotive qualification are not required - not drop-in compatible |
Compared with ADM8321WCY46ARJZR7, ADM8320WCY29ARJZR7 removes manual reset but retains identical watchdog and dual-output behavior, while TPS3808G33DBVR offers basic reset supervision at lower cost and complexity but lacks automotive qualification, dual signaling, and watchdog capability.
Availability
ADM8321WCY46ARJZR7 is available at Aetrix Electronics and suitable for automotive infotainment, engine control units, and industrial PLC controllers requiring stable component supply with guaranteed long-term availability and AEC-Q100 compliance.
Supply support for ADM8321WCY46ARJZR7 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 ADM83xx family was engineered specifically for automotive and industrial supervisory applications demanding wide temperature operation, precise voltage thresholds, and integrated watchdog reliability - with ADM8321WCY46ARJZR7 optimized for 4.63 V rail monitoring in safety-critical systems.
FAQ
What is the reset threshold voltage of ADM8321WCY46ARJZR7?
The ADM8321WCY46ARJZR7 has a factory-trimmed nominal reset threshold of 4.63 V, with tolerance of ±1% at 25°C and ±1.5% over the full operating temperature range of −40°C to +125°C. This value is confirmed in Table 9 and the Ordering Guide section of the Rev. D datasheet, and applies specifically to this part number's "CY46" suffix designation.
Does ADM8321WCY46ARJZR7 include a manual reset input?
No, ADM8321WCY46ARJZR7 does not feature a manual reset (MR) input. Per Table 6 and the Ordering Guide, ADM8321 devices have watchdog and dual-output capability but omit MR - unlike ADM8316, ADM8319, and ADM8322. This is a fixed architectural difference confirmed across all ADM8321 variants.
What are the watchdog timeout options supported by ADM8321WCY46ARJZR7?
ADM8321WCY46ARJZR7 supports four watchdog timeout options: 6.3 ms, 102 ms, 1.6 sec, and 25.6 sec (typical). For this specific part, the "Y" suffix in "CY46" indicates the 1.6 sec typical timeout, as verified in the "Reset Threshold, Minimum Reset Timeout, and Typical Watchdog Timeout Options" table on page 16 of the datasheet.
What package type and lead count does ADM8321WCY46ARJZR7 use?
ADM8321WCY46ARJZR7 uses a 5-lead SOT-23 package, designated RJ-5 in Analog Devices' packaging nomenclature. This is explicitly stated in the Outline Dimensions section (page 15), Pin Configurations (page 6), and Ordering Guide (page 15), and confirmed by the "RJZR7" suffix in the part number.
Is ADM8321WCY46ARJZR7 qualified for automotive applications?
Yes, ADM8321WCY46ARJZR7 is automotive-qualified: the "W" prefix in the part number (ADM8321WCY46ARJZR7) denotes qualification per AEC-Q100 requirements, and the datasheet's Automotive Products section confirms controlled manufacturing for automotive use. Its −40°C to +125°C operating range and automotive-grade reliability reporting further validate this status.
ADM8321WCY46ARJZR7 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:
- 4.63V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/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
ADM8321WCY46ARJZR7 FAQ
1.How can I place an order for ADM8321WCY46ARJZR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8321WCY46ARJZR7 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 ADM8321WCY46ARJZR7 reliable?
The price and inventory of ADM8321WCY46ARJZR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8321WCY46ARJZR7 is usually 5 days.
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Once your ADM8321WCY46ARJZR7 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 ADM8321WCY46ARJZR7?
For technical support, including ADM8321WCY46ARJZR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8321WCY46ARJZR7 requirements.
6.How does Aetrix verify that ADM8321WCY46ARJZR7 is sourced from the original manufacturer or authorized distributors?
All ADM8321WCY46ARJZR7 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 ADM8321WCY46ARJZR7 meets industry standards.
7.What is the process for return or replacement of ADM8321WCY46ARJZR7?
All ADM8321WCY46ARJZR7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8321WCY46ARJZR7, 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 ADM8321WCY46ARJZR7 part is unused and in its original packaging.
Return procedure for ADM8321WCY46ARJZR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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