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Analog Devices Inc. ADM8318WCY46ARJZR7
- Part No.:
- ADM8318WCY46ARJZR7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8318WCY46ARJZR7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,648
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Product details
Overview
ADM8318WCY46ARJZR7 from Analog Devices is a supervisory circuit with watchdog timer and dual push-pull reset outputs, designed for microprocessor supply voltage monitoring in automotive and industrial systems. It features a 4.63 V reset threshold, 140 ms minimum reset timeout, 1.6 sec typical watchdog timeout, −40°C to +125°C operation, and 5-lead SOT-23 package.
For engineers reviewing the ADM8318WCY46ARJZR7 datasheet, ADM8318WCY46ARJZR7 pinout, ADM8318WCY46ARJZR7 application, or ADM8318WCY46ARJZR7 equivalent, key selection criteria include reset threshold accuracy, dual active-low/active-high output capability, watchdog timeout stability over temperature, and AEC-Q100 qualified automotive reliability.
Technical Context
The ADM8318WCY46ARJZR7 integrates a precision voltage monitor, programmable reset timeout, and watchdog timer with logic transition detection on WDI. Its dual push-pull RESET and RESET outputs enable direct interface with both active-low and active-high microcontroller reset inputs without external level-shifting.
It operates across the full automotive temperature range (−40°C to +125°C) with ±1.5% reset threshold tolerance over temperature and 20 ppm/°C temperature coefficient. The watchdog timer clears on any WDI edge (≥50 ns pulse width) and asserts reset if unattended for 1.6 sec (typical), supporting robust code-execution integrity monitoring.
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 with margin. |
| Reset Timeout | 140 ms minimum - guarantees sufficient power stabilization time before releasing processor reset after VCC rise. |
| Watchdog Timeout | 1.6 sec typical - balances responsiveness to firmware hangs against false triggers from transient delays. |
| Supply Current | 10 µA at 5.5 V - enables integration into always-on automotive modules without significant battery drain. |
| Operating Temp | −40°C to +125°C - meets AEC-Q100 Grade 0 requirements for under-hood and infotainment applications. |
| Output Type | Dual push-pull: active-low RESET and active-high RESET - eliminates need for external inverters or pull resistors. |
| WDI Pulse Width | 50 ns minimum - supports high-frequency watchdog strobing in real-time firmware without timing overhead. |
Pinout & Package
ADM8318WCY46ARJZR7 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 matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives low to assert reset; valid down to VCC = 0.9 V; sinks 1.2 mA at 2.7 V. |
| 2 | GND | Ground reference - must be connected directly to system ground plane for stable threshold and noise immunity. |
| 3 | RESET | Active-high push-pull reset output - drives high to assert reset; complements RESET for mixed-interface systems. |
| 4 | WDI | Watchdog input - toggling edge resets internal timer; floating disables watchdog; accepts 50 ns pulses. |
| 5 | VCC | Monitored supply input - powers device and provides reference for reset threshold detection; operates from 0.9 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Simultaneous active-low and active-high signals eliminate external logic or pull resistors in multi-vendor MCU designs. |
| Automotive-qualified (W-grade) | Controlled manufacturing, AEC-Q100 compliance, and extended temperature support enable use in infotainment and ADAS ECUs. |
| Factory-trimmed 4.63 V threshold | ±1.5% tolerance over full temperature range ensures consistent brownout response without calibration. |
| 1.6 sec watchdog timeout (typical) | Matches typical firmware loop durations in automotive microcontrollers, reducing false resets while catching hangs. |
| 10 µA quiescent current | Enables permanent connection to battery rails in always-on vehicle modules without compromising standby life. |
Applications
| Automotive Infotainment Head Unit | Engine Control Unit (ECU) Power Monitor |
|---|---|
|
Use Scenario: Monitors 5 V supply to SoC and audio DSP during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout protection, and watchdog supervision of boot firmware. Use Value: Dual RESET/RESET outputs interface natively with both ARM Cortex-A and legacy MCU reset pins; 4.63 V threshold aligns with 5 V rail derating. |
Use Scenario: Ensures deterministic restart of engine management software after voltage sags caused by starter motor engagement. IC Role / Device Role / Timing Role: Voltage supervisor with 140 ms reset timeout and 1.6 sec watchdog, operating across −40°C to +125°C. Use Value: Guaranteed reset assertion down to VCC = 0.9 V prevents latch-up during deep brownouts; AEC-Q100 qualification validates reliability. |
| Industrial PLC CPU Module | Telematics Control Unit (TCU) |
|
Use Scenario: Provides fail-safe reset and watchdog coverage for ARM-based controller running real-time I/O firmware. IC Role / Device Role / Timing Role: Dual-output supervisor enabling compatibility with multiple generations of PLC CPUs requiring different reset polarity. Use Value: 10 µA supply current supports long-term backup battery operation; 20 ppm/°C threshold drift maintains accuracy across wide ambient swings. |
Use Scenario: Monitors main 3.3 V and auxiliary 5 V rails in LTE/V2X gateway, detecting supply faults and firmware stalls. IC Role / Device Role / Timing Role: Automotive-grade supervisory IC with watchdog timer and dual reset outputs for redundant safety monitoring. Use Value: W-grade qualification ensures traceability and PPAP documentation; 140 ms reset timeout accommodates slow-rising CAN transceiver supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM8321WCY46ARJZR7 | Same 4.63 V threshold, 140 ms reset timeout, 1.6 sec watchdog, but uses open-drain RESET + push-pull RESET. | Requires external pull-up on open-drain output; less suitable for direct MCU interface without level translation. | Select ADM8321WCY46ARJZR7 only when open-drain flexibility is needed for wired-OR reset buses. |
| MAX6326UT46D3+T | 4.63 V threshold, 140 ms reset timeout, no watchdog timer, SOT-23-5, 1.2 µA supply current. | Lacks watchdog functionality; intended for simpler power-monitoring-only applications. | Choose MAX6326UT46D3+T only when watchdog supervision is not required and ultra-low current (<2 µA) is critical. |
Compared with ADM8318WCY46ARJZR7, ADM8321WCY46ARJZR7 trades push-pull simplicity for open-drain versatility, while MAX6326UT46D3+T sacrifices watchdog capability for lower quiescent current-making ADM8318WCY46ARJZR7 optimal for automotive systems requiring both robust reset control and execution integrity monitoring.
Availability
ADM8318WCY46ARJZR7 is available at Aetrix Electronics and suitable for automotive infotainment, engine control units, and industrial PLCs requiring stable component supply with AEC-Q100 qualification and extended temperature support.
Supply support for ADM8318WCY46ARJZR7 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 ADM8318 is part of Analog Devices' automotive-qualified supervisory circuit family, engineered specifically for reliable power monitoring and watchdog supervision in harsh-temperature embedded systems.
FAQ
What is the reset threshold voltage of the ADM8318WCY46ARJZR7?
The ADM8318WCY46ARJZR7 has a factory-trimmed reset threshold of 4.63 V, with ±1% tolerance at 25°C and ±1.5% over the full −40°C to +125°C operating range. This value is confirmed in Table 9 and the Ordering Guide section of the Rev. D datasheet, and aligns with the "CY" suffix in the part number per the ordering code structure.
Does the ADM8318WCY46ARJZR7 include a watchdog timer?
Yes, the ADM8318WCY46ARJZR7 includes a watchdog timer with a typical timeout of 1.6 seconds, as specified in the "RESET THRESHOLD, MINIMUM RESET TIMEOUT, AND TYPICAL WATCHDOG TIMEOUT OPTIONS" table. It clears on any logic transition (≥50 ns) at the WDI pin and asserts reset if unattended beyond timeout.
What are the reset output configurations supported by the ADM8318WCY46ARJZR7?
The ADM8318WCY46ARJZR7 provides dual push-pull reset outputs: pin 1 (RESET) is active-low, and pin 3 (RESET) is active-high. Both outputs are guaranteed functional down to VCC = 0.9 V and drive full logic levels without external components, as documented in Tables 3–5 and the Circuit Description section.
Is the ADM8318WCY46ARJZR7 qualified for automotive applications?
Yes, the "W" in ADM8318WCY46ARJZR7 denotes automotive qualification. It is manufactured under controlled processes meeting AEC-Q100 requirements, rated for −40°C to +125°C operation, and explicitly listed in the Automotive Products section of the datasheet as qualified for automotive use.
What is the supply current consumption of the ADM8318WCY46ARJZR7?
The ADM8318WCY46ARJZR7 consumes 10 µA typical supply current at VCC = 5.5 V and 25°C, rising to 20 µA maximum. At 3.6 V, it draws 10–18 µA. This low quiescent current is verified in Table 1 under "Supply Current (WDI Floating)" and supports battery-backed automotive modules.
ADM8318WCY46ARJZR7 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:
- Push-Pull, 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
ADM8318WCY46ARJZR7 FAQ
1.How can I place an order for ADM8318WCY46ARJZR7 through Aetrix?
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6.How does Aetrix verify that ADM8318WCY46ARJZR7 is sourced from the original manufacturer or authorized distributors?
All ADM8318WCY46ARJZR7 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 ADM8318WCY46ARJZR7 meets industry standards.
7.What is the process for return or replacement of ADM8318WCY46ARJZR7?
All ADM8318WCY46ARJZR7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8318WCY46ARJZR7, 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 ADM8318WCY46ARJZR7 part is unused and in its original packaging.
Return procedure for ADM8318WCY46ARJZR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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