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Analog Devices Inc. ADM6321AY31ARJZ-R7
- Part No.:
- ADM6321AY31ARJZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM6321AY31ARJZ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,511
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Product details
Overview
ADM6321AY31ARJZ-R7 from Analog Devices is a supervisory circuit with watchdog timer and open-drain active-low RESET output, designed for microprocessor voltage monitoring and code execution integrity assurance. It features a 3.08 V reset threshold (±2.5% over −40°C to +85°C), 140 ms minimum reset timeout, 1.6 s typical watchdog timeout, manual reset input disabled, and operates from 1 V to 5.5 V supply. It is used in embedded controllers where brownout detection and fail-safe restart are critical.
For engineers reviewing the ADM6321AY31ARJZ-R7 datasheet, ADM6321AY31ARJZ-R7 pinout, ADM6321AY31ARJZ-R7 application, or ADM6321AY31ARJZ-R7 equivalent, key selection criteria include its open-drain RESET configuration, absence of manual reset input, 3.08 V threshold accuracy across temperature, industrial-grade operating range, and compatibility with low-power portable systems requiring guaranteed reset validity down to VCC = 1 V.
Technical Context
The ADM6321AY31ARJZ-R7 implements a precision bandgap-based voltage reference with 40 ppm/°C temperature coefficient and 3 mV hysteresis to ensure stable reset assertion during supply transients. Its watchdog timer clears on any WDI logic transition (≥50 ns pulse width) and times out after 1.6 s (typical), resetting the host processor if firmware fails to service it.
This device belongs to the ADM6321 variant group-characterized by watchdog enable, no manual reset input, open-drain RESET, and push-pull RESET -and is configured specifically for 3.08 V threshold (Y31), 140 ms reset timeout (C), and 1.6 s watchdog timeout (Y). It guarantees valid reset output down to VCC = 1 V and provides power supply glitch immunity up to 100 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±2.5% over −40°C to +85°C - ensures reliable brownout detection for 3.3 V systems with margin. |
| Reset Timeout | 140 ms (min) - provides sufficient hold time for microprocessor power stabilization after VCC rise. |
| Watchdog Timeout | 1.6 s (typical) - balances responsiveness to firmware lockup against false triggers from transient delays. |
| Supply Current | 5 µA at VCC = 3.6 V - enables integration into battery-powered portable equipment without significant drain. |
| Operating Voltage Range | 1 V to 5.5 V - supports operation during deep brownout and ensures reset validity even as supply collapses. |
| Output Configuration | Open-drain active-low RESET + push-pull active-high RESET - allows flexible interface with diverse MCU reset inputs and level-shifting requirements. |
| Temperature Range | −40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
ADM6321AY31ARJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm lead pitch and 2.80–3.00 mm body length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Open-drain output requiring external pull-up; asserts low when VCC < 3.08 V, WDI unserviced, or during reset timeout. |
| 2 | GND | Ground reference for internal comparators, watchdog timer, and output stages. |
| 3 | RESET (active-high) | Push-pull output driven high during normal operation; goes low synchronously with active-low RESET deassertion. |
| 4 | WDI | Watchdog input - must be toggled within 1.6 s; floating disables watchdog; 50 ns minimum pulse width supported. |
| 5 | VCC | Monitored supply rail - powers internal circuitry and serves as reference for threshold comparison. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1 V | Enables fail-safe reset assertion even during severe brownout, preventing undefined MCU states. |
| 40 ppm/°C reset threshold tempco | Minimizes drift-induced false resets across industrial temperature range, improving system reliability. |
| 3 mV internal hysteresis | Prevents oscillatory reset behavior during slow VCC recovery near threshold voltage. |
| Power supply glitch immunity | Rejects transients ≤100 ns, eliminating spurious resets from switching noise or ESD coupling. |
| Low 5 µA quiescent current | Extends battery life in portable instrumentation and IoT edge nodes without compromising supervision fidelity. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
|
Use Scenario: Continuous operation in factory-floor automation with variable 24 V DC input converted to 3.3 V logic rails. IC Role / Device Role / Timing Role: Monitors 3.3 V microcontroller supply and asserts dual RESET outputs to guarantee deterministic restart after undervoltage events. Use Value: Prevents runaway motion control due to silent MCU lockup; open-drain RESET interfaces directly with opto-isolated reset chains. |
Use Scenario: Battery-backed handheld device delivering precise fluid dosing with safety-critical firmware execution. IC Role / Device Role / Timing Role: Supervises main SoC supply and enforces watchdog timeout to recover from sensor-read or motor-control task hangs. Use Value: Dual RESET outputs allow independent reset signaling to safety monitor IC and application processor; 1.6 s watchdog interval avoids nuisance resets during long ADC conversions. |
| Smart Energy Meter | Automotive Telematics Module |
|
Use Scenario: Mains-powered meter with supercapacitor backup sustaining RTC and metrology during grid outages. IC Role / Device Role / Timing Role: Detects brownout on 3.3 V rail and initiates controlled shutdown sequence via active-high RESET while holding active-low RESET asserted. Use Value: Ensures EEPROM write completion before power loss; 140 ms reset timeout accommodates capacitor discharge delay without premature release. |
Use Scenario: CAN-connected module powered from vehicle battery with wide input variation (6–16 V) and cold-crank transients. IC Role / Device Role / Timing Role: Monitors post-regulator 3.3 V rail and validates firmware liveness via WDI toggling synchronized to CAN message scheduling. Use Value: Open-drain RESET tolerates higher-voltage pull-ups required by legacy automotive MCUs; 3.08 V threshold aligns with 3.3 V LDO dropout margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM6320CY31ARJZ-R7 | Same 3.08 V threshold, 140 ms reset timeout, and 1.6 s watchdog timeout, but features manual reset input (MR) and single open-drain RESET output. | Required where field-serviceable hardware reset via push-button is needed; lacks dual RESET capability. | Select when MR functionality is mandatory and dual-reset signaling is unnecessary. |
| TPS3808G30DBVR | 3.0 V fixed threshold, 200 ms reset timeout, no watchdog, push-pull active-low RESET only, 2.5 µA supply current. | Suitable for basic power-on reset only; cannot detect or recover from firmware hangs. | Choose for cost-sensitive, non-safety-critical applications lacking watchdog requirements. |
Compared with ADM6320CY31ARJZ-R7 and TPS3808G30DBVR, ADM6321AY31ARJZ-R7 uniquely delivers dual-output reset signaling (open-drain + push-pull) without manual reset overhead-ideal for space-constrained designs needing both logic-level flexibility and autonomous watchdog recovery.
Availability
ADM6321AY31ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, smart energy meters, and automotive telematics modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM6321AY31ARJZ-R7 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.
The ADM63xx family was engineered for robust microprocessor supervision in harsh environments, emphasizing precision threshold accuracy, ultra-low power, and integrated watchdog functionality for mission-critical embedded systems.
FAQ
What is the reset threshold voltage of ADM6321AY31ARJZ-R7 and how stable is it over temperature?
The ADM6321AY31ARJZ-R7 has a nominal reset threshold of 3.08 V, specified with ±2.5% tolerance over the full industrial temperature range (−40°C to +85°C) and a temperature coefficient of 40 ppm/°C. This ensures predictable brownout detection in 3.3 V systems even under thermal stress, with minimal drift that avoids false resets during ambient fluctuations.
Does ADM6321AY31ARJZ-R7 include a manual reset input (MR)?
No, ADM6321AY31ARJZ-R7 does not include a manual reset input. Per Table 1 in the datasheet, the ADM6321 variant is defined by watchdog enable and absence of MR. Pin 3 is assigned to the active-high RESET output-not MR-making it unsuitable for push-button reset initiation.
What are the watchdog timeout options supported by ADM6321AY31ARJZ-R7?
ADM6321AY31ARJZ-R7 supports four watchdog timeout options: 6.3 ms, 102 ms, 1.6 s, and 25.6 s (typical). The "Y" suffix in the part number confirms the 1.6 s typical timeout, validated across temperature and process corners per the device's characterization data.
How does the dual RESET output configuration of ADM6321AY31ARJZ-R7 benefit system design?
ADM6321AY31ARJZ-R7 provides both an open-drain active-low RESET and a push-pull active-high RESET. This allows simultaneous interfacing with legacy MCUs requiring active-low reset and modern SoCs expecting active-high assertion-eliminating level-shifters or external logic while maintaining timing coherence between both signals.
Is ADM6321AY31ARJZ-R7 suitable for battery-powered applications?
Yes, ADM6321AY31ARJZ-R7 draws only 5 µA typical supply current at 3.6 V, and remains functional down to VCC = 1 V. Its low power consumption and guaranteed reset validity at ultra-low supply voltages make it well-suited for coin-cell or Li-ion–powered portable instrumentation and wireless sensor nodes.
ADM6321AY31ARJZ-R7 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM6321AY31ARJZ-R7 FAQ
1.How can I place an order for ADM6321AY31ARJZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM6321AY31ARJZ-R7 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 ADM6321AY31ARJZ-R7 reliable?
The price and inventory of ADM6321AY31ARJZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM6321AY31ARJZ-R7 is usually 5 days.
3.What payment methods are accepted for ADM6321AY31ARJZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM6321AY31ARJZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM6321AY31ARJZ-R7?
ADM6321AY31ARJZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM6321AY31ARJZ-R7 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 ADM6321AY31ARJZ-R7?
For technical support, including ADM6321AY31ARJZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM6321AY31ARJZ-R7 requirements.
6.How does Aetrix verify that ADM6321AY31ARJZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM6321AY31ARJZ-R7 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 ADM6321AY31ARJZ-R7 meets industry standards.
7.What is the process for return or replacement of ADM6321AY31ARJZ-R7?
All ADM6321AY31ARJZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM6321AY31ARJZ-R7, 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 ADM6321AY31ARJZ-R7 part is unused and in its original packaging.
Return procedure for ADM6321AY31ARJZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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