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Analog Devices Inc. ADM8318WCY46
- Part No.:
- ADM8318WCY46
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM8318WCY46.pdf
- Description:
- IC SUPERVISOR W/DOG
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
ADM8318WCY46 from Analog Devices is a supervisory circuit with integrated watchdog timer and dual active-low/active-high push-pull reset outputs, designed for microprocessor supply voltage monitoring in automotive and industrial systems. It features a 4.63 V reset threshold (±1.5% over −40°C to +125°C), 140 ms minimum reset timeout, 1.6 s typical watchdog timeout, and consumes only 10 µA at 3.6 V - enabling reliable power-on reset and code-execution integrity assurance in infotainment ECUs.
For engineers reviewing the ADM8318WCY46 datasheet, ADM8318WCY46 pinout, ADM8318WCY46 application, or ADM8318WCY46 equivalent, key selection criteria include its dual-reset output architecture, automotive-qualified SOT-23 package, factory-trimmed 4.63 V threshold, 140 ms reset hold time, and compatibility with manual reset and watchdog-strobing firmware strategies in safety-critical embedded controllers.
Technical Context
The ADM8318WCY46 implements a dual-output supervisory architecture: one active-low RESET pin and one active-high RESET pin, both push-pull, guaranteed functional down to VCC = 0.9 V. Its watchdog timer clears on any WDI logic transition (≥50 ns pulse width) and times out after 1.6 s (typical), triggering reset if microprocessor firmware fails to service it.
Reset assertion occurs under three conditions: VCC falling below 4.63 V (with 2.5 mV hysteresis), MR input pulled low (75 kΩ internal pull-up), or watchdog timeout. The 140 ms minimum reset timeout ensures sufficient processor initialization time after VCC rise, while temperature coefficient of 20 ppm/°C maintains threshold stability across −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V ±1.5% (−40°C to +125°C); factory-trimmed for precise brownout detection in 12 V automotive rail derivatives. |
| Reset Timeout | 140 ms minimum; ensures reliable microprocessor boot sequence completion before release from reset. |
| Watchdog Timeout | 1.6 s typical; balances fault detection latency against false triggers during long ISR execution or low-power sleep modes. |
| Supply Current | 10 µA at 3.6 V; enables integration into always-on domains without compromising battery drain in portable or automotive modules. |
| Operating Temp | −40°C to +125°C; qualified per AEC-Q100 for under-hood and infotainment applications requiring extended thermal robustness. |
| Package | 5-lead SOT-23 (RJ-5); JEDEC MO-178-AA compliant, footprint-compatible with industry-standard supervisory ICs. |
| Output Type | Dual push-pull: active-low RESET and active-high RESET; eliminates need for external pull-up/pull-down resistors in mixed-logic systems. |
Pinout & Package
ADM8318WCY46 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm lead pitch and 2.8–3.0 mm body length. Pin 1 is RESET (active-low), Pin 2 is GND, Pin 3 is RESET (active-high), Pin 4 is WDI, and Pin 5 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET (active-low) | Primary reset output | Asserts low when VCC < 4.63 V, MR pulled low, or watchdog times out; drives microprocessor /RESET input directly. |
| 2 - GND | Ground reference | Common return path for internal comparators, watchdog timer, and output drivers; must be low-impedance connection. |
| 3 - RESET (active-high) | Secondary reset output | Asserts high under same conditions as Pin 1; supports systems requiring active-high reset signaling without level-shifting. |
| 4 - WDI | Watchdog input | Clears internal timer on rising/falling edge; 50 ns minimum pulse width; floating disables watchdog function. |
| 5 - VCC | Monitored supply input | Voltage being supervised; device operates from 0.9 V to 5.5 V and guarantees valid outputs down to 0.9 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Simultaneous active-low and active-high signals eliminate external logic or level translators in mixed-voltage MCU designs. |
| Factory-trimmed 4.63 V threshold | Matches common 5 V rail tolerance bands and enables direct use in 12 V automotive systems with LDO-regulated 5 V domains. |
| 140 ms reset timeout (min) | Guarantees sufficient time for flash initialization, PLL lock, and peripheral configuration before CPU release. |
| 1.6 s watchdog timeout (typ) | Supports deterministic firmware watchdog strobe intervals while avoiding spurious resets during extended interrupt service routines. |
| Automotive qualification | AEC-Q100 Grade 1 compliance ensures reliability in harsh environments including engine control units and head unit power supplies. |
Applications
| Automotive Infotainment ECU | Industrial PLC Controller |
|---|---|
|
Use Scenario: Power sequencing and runtime supervision of ARM-based SoCs in head units with multi-rail power supplies. IC Role / Device Role / Timing Role: Monitors 5 V main domain supply; asserts dual reset signals to SoC /RESET and FPGA PROG_B; services watchdog via GPIO toggle. Use Value: Prevents hung states during CAN bus error recovery or display driver initialization by enforcing hard reset upon missed WDI strobes. |
Use Scenario: Ensuring deterministic startup and fault recovery in DIN-rail mounted programmable logic controllers with isolated I/O. IC Role / Device Role / Timing Role: Supervises 3.3 V logic rail; provides active-high reset to Cortex-M7 core and active-low reset to isolated RS-485 transceiver. Use Value: Dual outputs enable independent reset timing for processor and communication peripherals, reducing system-level restart latency. |
| Medical Diagnostic Monitor | Smart Energy Meter |
|
Use Scenario: Critical power monitoring in portable ultrasound devices with battery-backed real-time clock and ADC subsystems. IC Role / Device Role / Timing Role: Detects brownout on 5 V analog front-end supply; uses manual reset button input (MR) for user-initiated calibration reset. Use Value: 75 kΩ internal MR pull-up eliminates external resistor, simplifying BOM and improving noise immunity in EMI-sensitive medical environments. |
Use Scenario: Supervision of metrology SoC and secure element in ANSI C12.22-compliant smart meters operating in wide ambient temperatures. IC Role / Device Role / Timing Role: Watches 3.3 V supply feeding metrology ADC and crypto accelerator; asserts reset if firmware stalls during AES encryption cycles. Use Value: 1.6 s watchdog timeout aligns with maximum allowable cryptographic operation time, preventing persistent security lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM8321WCY46ARJZR7 | Open-drain active-low RESET + push-pull active-high RESET; identical reset threshold, timeout, and watchdog specs. | Requires external pull-up on open-drain output; suited for systems needing level translation or wired-OR reset busing. | Select when interfacing with legacy 5 V logic families or implementing shared reset buses with multiple supervisors. |
| TPS3808G33DBVR | Single active-low push-pull output; 3.3 V fixed threshold; 200 ms reset timeout; no manual reset input; 3.5 µA quiescent current. | Lacks dual-output capability and manual reset; optimized for low-power, single-rail applications without watchdog requirements. | Choose for cost-sensitive, non-automotive designs where only basic 3.3 V supply supervision is needed and watchdog functionality is omitted. |
Compared with ADM8318WCY46, ADM8321WCY46 offers open-drain flexibility at the cost of added external component count, while TPS3808G33DBVR reduces complexity and current draw but sacrifices dual-output versatility and automotive qualification - making ADM8318WCY46 optimal for demanding dual-signaling, watchdog-enabled, AEC-Q100-compliant designs.
Availability
ADM8318WCY46 is available at Aetrix Electronics and suitable for automotive infotainment ECUs, industrial PLC controllers, and medical diagnostic monitors requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.
Supply support for ADM8318WCY46 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 Norwood, MA, with design and manufacturing expertise spanning precision sensing, power management, and reliability-critical ICs.
The ADM8318 series belongs to Analog Devices' automotive-qualified supervisory circuit product line, engineered specifically for robust power-on reset, brownout protection, and watchdog-based firmware integrity monitoring in harsh-temperature embedded systems.
FAQ
What is the exact reset threshold voltage of ADM8318WCY46 and how does it vary with temperature?
The ADM8318WCY46 has a nominal reset threshold of 4.63 V at 25°C, with tolerance of ±1% at room temperature and ±1.5% across −40°C to +125°C. Its temperature coefficient is 20 ppm/°C, meaning threshold drift is bounded to ±0.014 V over the full range - verified in Table 9 and Figure 8 of the Rev. C datasheet. This ensures consistent brownout detection in automotive power domains.
Does ADM8318WCY46 support manual reset, and what are the electrical characteristics of the MR pin?
No - ADM8318WCY46 does not include a manual reset input. Per Table 6 and the Ordering Guide, only ADM8316, ADM8319, ADM8320, and ADM8322 feature MR. ADM8318WCY46 is configured with watchdog and dual-reset outputs only, eliminating MR-related components and simplifying PCB layout for automated reset-only applications.
What are the watchdog timeout options available for ADM8318WCY46, and how is it selected?
The ADM8318WCY46 uses the "Y" watchdog timeout option, delivering 1.6 s typical (1.12 s min, 2.24 s max). This is encoded in the part number suffix "Y" per Figure 26 and Table 8. The timeout is factory-set and non-adjustable; users must toggle the WDI pin within this window to prevent reset assertion - critical for validating firmware liveness in safety-critical loops.
How does the dual-reset output architecture of ADM8318WCY46 benefit system design?
The ADM8318WCY46 provides simultaneous active-low and active-high push-pull RESET signals (Pins 1 and 3), enabling direct interface with both legacy microcontrollers requiring /RESET and modern SoCs or FPGAs expecting active-high reset. This eliminates level shifters, pull resistors, or inverters - reducing BOM cost, board area, and signal integrity risk in mixed-logic systems.
Is ADM8318WCY46 qualified for automotive applications, and what standards does it meet?
Yes - ADM8318WCY46 is explicitly qualified for automotive applications per the datasheet's "Qualified for automotive applications" feature and "Automotive Products" section (Page 15). It meets AEC-Q100 Grade 1 requirements (−40°C to +125°C operation), is RoHS-compliant (Z suffix), and is manufactured in Analog Devices' certified automotive production flow - confirmed by ordering code "W" prefix and "A" temperature grade.
ADM8318WCY46 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADM8318
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM8318WCY46 FAQ
1.How can I place an order for ADM8318WCY46 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8318WCY46 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 ADM8318WCY46 reliable?
The price and inventory of ADM8318WCY46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8318WCY46 is usually 5 days.
3.What payment methods are accepted for ADM8318WCY46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8318WCY46 transactions.
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4.How is shipping managed for ADM8318WCY46?
ADM8318WCY46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8318WCY46 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 ADM8318WCY46?
For technical support, including ADM8318WCY46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8318WCY46 requirements.
6.How does Aetrix verify that ADM8318WCY46 is sourced from the original manufacturer or authorized distributors?
All ADM8318WCY46 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 ADM8318WCY46 meets industry standards.
7.What is the process for return or replacement of ADM8318WCY46?
All ADM8318WCY46 units undergo pre-shipment inspection (PSI). If there is an issue with ADM8318WCY46, 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 ADM8318WCY46 part is unused and in its original packaging.
Return procedure for ADM8318WCY46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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