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Analog Devices Inc. ADM6321CY46ARJZ-R7
- Part No.:
- ADM6321CY46ARJZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM6321CY46ARJZ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,259
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Product details
Overview
ADM6321CY46ARJZ-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 4.63 V reset threshold (±2.5% over −40°C to +85°C), 140 ms minimum reset timeout, 1.6 s typical watchdog timeout, and operates from 1 V to 5.5 V supply. Used in embedded controllers where brownout recovery and firmware hang detection are critical.
For engineers reviewing the ADM6321CY46ARJZ-R7 datasheet, ADM6321CY46ARJZ-R7 pinout, ADM6321CY46ARJZ-R7 application, or ADM6321CY46ARJZ-R7 equivalent, key selection criteria include its open-drain RESET configuration, absence of manual reset input, dual watchdog and power-on reset functionality, guaranteed reset validity down to VCC = 1 V, and industrial temperature range support.
Technical Context
The ADM6321CY46ARJZ-R7 integrates a precision voltage reference, reset generator, and watchdog timer with glitch-immune logic. Its open-drain RESET output requires an external pull-up resistor and supports interfacing with diverse logic families up to 6 V. The watchdog clears on any WDI pin transition (min. 50 ns pulse width) and times out after 1.6 s (typical) if unattended.
Unlike variants with manual reset (MR), ADM6321 lacks MR input-its reset assertion relies solely on VCC undervoltage, watchdog timeout, or external reset initiation via system-level control. Reset remains asserted for ≥140 ms after VCC rises above 4.63 V, ensuring reliable processor initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V ±2.5% over −40°C to +85°C - ensures stable reset activation during 5 V rail brownouts. |
| Reset Timeout | 140 ms minimum - guarantees sufficient hold time for full microprocessor boot sequence. |
| Watchdog Timeout | 1.6 s typical - balances responsiveness to firmware hangs against false triggers from transient delays. |
| Supply Current | 5 µA at VCC = 3.6 V - enables use in battery-powered portable equipment without significant drain. |
| Operating Voltage | 1 V to 5.5 V - allows valid reset assertion even during deep brownout conditions before full shutdown. |
| Output Type | Open-drain active-low RESET - supports wired-OR configurations and level-shifting with external pull-up. |
| Temperature Range | −40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
ADM6321CY46ARJZ-R7 is housed in a 5-lead SOT-23 package (JEDEC MO-178-AA compliant), measuring 2.90 mm × 1.60 mm × 1.15 mm, with gull-wing leads and 0.95 mm lead pitch. This compact footprint supports high-density PCB layouts in space-constrained embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low open-drain reset output | Must be pulled up externally (e.g., 10 kΩ to 3.3 V or 5 V); asserts low during VCC < 4.63 V or watchdog timeout. |
| 2: GND | Ground reference | Primary return path for internal circuits and reset output sink current. |
| 3: RESET | Active-high push-pull reset output | Provides complementary active-high signal synchronized with pin 1; no external pull-up required. |
| 4: WDI | Watchdog input | Clears watchdog timer on any logic transition; floating disables watchdog; min. 50 ns pulse width supported. |
| 5: VCC | Monitored power supply input | Supplies device operation and serves as reference for reset threshold detection; valid from 1 V to 5.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1 V | Enables fail-safe reset assertion even during severe brownout, preventing undefined processor states. |
| Power supply glitch immunity | Rejects transients ≤100 ns (typical) on VCC, avoiding spurious resets in noisy industrial environments. |
| 4.63 V precision reset threshold | Matches standard 5 V rail tolerance (±5%), ensuring reset activates only when supply falls outside safe operating window. |
| Low 5 µA quiescent current | Extends battery life in portable instrumentation and remote sensors without compromising supervision reliability. |
| Open-drain + push-pull dual RESET outputs | Supports both legacy active-low reset inputs and modern active-high logic interfaces from a single device. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
|
Use Scenario: Continuous operation in factory-floor automation with fluctuating 24 V DC–to–5 V conversion and EMI exposure. IC Role / Device Role / Timing Role: Monitors 5 V microcontroller supply and detects firmware lockups via WDI strobing; asserts open-drain RESET to halt unsafe actuator commands. Use Value: Prevents uncontrolled motor motion during brownout or software crash by guaranteeing ≥140 ms reset pulse and valid output down to 1 V. |
Use Scenario: Battery-powered infusion delivery requiring fail-safe shutdown on power anomaly or missed watchdog feed. IC Role / Device Role / Timing Role: Supervises main MCU supply and enforces 1.6 s watchdog timeout to catch missed safety-critical task cycles. Use Value: 5 µA supply current extends single-charge battery life while maintaining certified fault response per IEC 62304. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Mains- and battery-backed meter with cold-start requirements and long-term reliability demands. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for metrology SoC; open-drain RESET interfaces with isolated communication ICs. Use Value: 4.63 V threshold aligns with 5 V LDO tolerance; −40°C to +85°C rating ensures accuracy across seasonal ambient shifts. |
Use Scenario: Under-dash electronics exposed to thermal cycling and load dump transients on 12 V–to–5 V rails. IC Role / Device Role / Timing Role: Detects 5 V rail collapse during alternator failure and initiates controlled MCU reboot via dual RESET outputs. Use Value: Glitch rejection prevents false resets from 100 ns load dump spikes; open-drain output withstands 6 V pull-up for CAN/LIN interface compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM6320CY46ARJZ-R7 | Same 4.63 V threshold, 140 ms reset timeout, 1.6 s watchdog, but includes manual reset (MR) input. | Supports external push-button reset; ADM6321 lacks MR, limiting field serviceability. | Select ADM6320 if system requires user-initiated reset; ADM6321 is preferred when MR adds unnecessary complexity or PCB routing overhead. |
| TPS3808G33DBVR | 3.3 V fixed reset threshold, 200 ms reset delay, no watchdog timer, push-pull active-low RESET only. | Provides basic voltage supervision only; cannot detect firmware hangs or support multi-rail sequencing. | Choose TPS3808G33DBVR for cost-sensitive, non-watchdog applications; ADM6321CY46ARJZ-R7 is essential where code execution integrity is safety-critical. |
Compared with ADM6320CY46ARJZ-R7, ADM6321CY46ARJZ-R7 removes MR to reduce pin count and simplify layout, while retaining identical supervision timing and watchdog capability; versus TPS3808G33DBVR, it adds watchdog functionality and adjustable threshold but at higher BOM cost and design complexity.
Availability
ADM6321CY46ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, smart energy meters, and automotive body control modules requiring stable component supply with guaranteed long-term availability.
Supply support for ADM6321CY46ARJZ-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 specifically for robust microprocessor supervision in harsh environments, emphasizing low-power operation, glitch immunity, and precise reset timing across industrial temperature ranges.
FAQ
What is the reset threshold voltage of ADM6321CY46ARJZ-R7 and how stable is it over temperature?
The ADM6321CY46ARJZ-R7 has a nominal reset threshold of 4.63 V, with ±2.5% tolerance over the full industrial temperature range (−40°C to +85°C). Its temperature coefficient is 40 ppm/°C, meaning threshold drift is limited to ~18.5 mV across the entire range - sufficient for reliable 5 V rail supervision without calibration.
Does ADM6321CY46ARJZ-R7 include a manual reset input (MR)?
No, ADM6321CY46ARJZ-R7 does not feature a manual reset input. Per Table 1 in the datasheet, ADM6321 is configured with watchdog input (WDI) and open-drain/push-pull RESET outputs only. Manual reset is present in ADM6320 and ADM6322 variants, but omitted in ADM6321 to reduce pin count and simplify system design.
What are the electrical requirements for the open-drain RESET output of ADM6321CY46ARJZ-R7?
The open-drain RESET output of ADM6321CY46ARJZ-R7 requires an external pull-up resistor to a voltage rail ≤6 V. A 10 kΩ resistor is recommended for most applications. The output sinks ≤3.2 mA at VCC ≥4.5 V and maintains <0.4 V logic low, enabling direct interface with 3.3 V or 5 V logic inputs.
How does the watchdog timer in ADM6321CY46ARJZ-R7 behave during power-up or brownout events?
During VCC ramp-up or brownout, the watchdog timer in ADM6321CY46ARJZ-R7 is automatically cleared when RESET is asserted - whether due to undervoltage or manual trigger. It only begins counting after RESET deasserts, preventing premature timeout during unstable supply conditions.
Can ADM6321CY46ARJZ-R7 operate reliably below 1.8 V supply voltage?
Yes, ADM6321CY46ARJZ-R7 is fully specified down to VCC = 1 V. Its reset outputs remain valid (logic low/high as defined), and internal supervision circuitry functions correctly. Supply current drops to ~4 µA at 1.5 V (Figure 7), confirming stable sub-1.8 V operation for ultra-low-power designs.
ADM6321CY46ARJZ-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:
- 4.63V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM6321CY46ARJZ-R7 FAQ
1.How can I place an order for ADM6321CY46ARJZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM6321CY46ARJZ-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 ADM6321CY46ARJZ-R7 reliable?
The price and inventory of ADM6321CY46ARJZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM6321CY46ARJZ-R7 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM6321CY46ARJZ-R7 transactions.
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ADM6321CY46ARJZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM6321CY46ARJZ-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 ADM6321CY46ARJZ-R7?
For technical support, including ADM6321CY46ARJZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM6321CY46ARJZ-R7 requirements.
6.How does Aetrix verify that ADM6321CY46ARJZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM6321CY46ARJZ-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 ADM6321CY46ARJZ-R7 meets industry standards.
7.What is the process for return or replacement of ADM6321CY46ARJZ-R7?
All ADM6321CY46ARJZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM6321CY46ARJZ-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 ADM6321CY46ARJZ-R7 part is unused and in its original packaging.
Return procedure for ADM6321CY46ARJZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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