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Analog Devices Inc. ADM6321AY30ARJZ-R7
- Part No.:
- ADM6321AY30ARJZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM6321AY30ARJZ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
ADM6321AY30ARJZ-R7 from Analog Devices is a supervisory circuit with watchdog timer and open-drain active-low reset output, designed for microprocessor supply voltage monitoring. It features a 3.0 V reset threshold (±2.5% over −40°C to +85°C), 140 ms minimum reset timeout, 1.6 s typical watchdog timeout, and operates down to VCC = 1 V. Used in embedded controllers where reliable power-on reset and code execution integrity are critical.
For engineers reviewing the ADM6321AY30ARJZ-R7 datasheet, ADM6321AY30ARJZ-R7 pinout, ADM6321AY30ARJZ-R7 application, or ADM6321AY30ARJZ-R7 equivalent, key selection criteria include reset threshold accuracy, watchdog timeout granularity, open-drain output compatibility with mixed-voltage systems, and industrial-temperature operation without external components.
Technical Context
The ADM6321AY30ARJZ-R7 integrates a precision voltage reference, reset generator, watchdog detector with debounce, and open-drain RESET output - all in a single 5-lead SOT-23 package. Its watchdog timer clears on any logic transition at WDI (min. 50 ns pulse width) and asserts reset if unattended beyond 1.6 s (typical), supporting fail-safe recovery in firmware-stuck scenarios.
It provides guaranteed reset assertion down to VCC = 1 V, includes internal MR pull-up (52 kΩ), and features power supply glitch immunity validated against transients up to 100 mV/8 µs (for VTH = 2.93 V). The device draws only 5–12 µA across 1.5–5.5 V supply range and supports industrial temperature operation (−40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00 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) - guarantees sufficient hold time for microprocessor initialization after power stabilization. |
| Watchdog Timeout | 1.6 s (typical) - balances responsiveness to firmware hangs with tolerance for brief interrupt latency. |
| Supply Current | 5 µA (typ) at VCC = 3.6 V - enables use in battery-powered portable equipment with multi-year runtime. |
| Output Type | Open-drain active-low RESET - allows level-shifting and wired-OR configuration with other reset sources. |
| Operating Temp | −40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor instrumentation. |
| VCC Range | 1 V to 5.5 V - ensures valid reset assertion even during deep brownout or partial power loss. |
Pinout & Package
ADM6321AY30ARJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm lead pitch and 2.8–3.0 mm body length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Requires external pull-up; sinks ≥1.2 mA at VCC ≥ 2.7 V; valid down to VCC = 1 V. |
| 2 - GND | Ground reference | Common return path for internal reference, watchdog, and reset logic; must be low-impedance. |
| 3 - RESET (active-high) | Push-pull active-high reset output | Complements Pin 1; drives high to VCC − 1.5 V at 800 µA source; enables dual-polarity reset signaling. |
| 4 - WDI | Watchdog input | Clears watchdog timer on any edge; 0.3×VCC/0.7×VCC thresholds; 120–160 µA input current when driven high. |
| 5 - VCC | Supply voltage input | Monitored rail; powers internal circuitry; supports 1–5.5 V operation; glitch-immune to <100 ns transients. |
Key Features
| Feature | Design Value |
|---|---|
| 26 selectable reset thresholds | 2.5 V to 5.0 V in 100 mV steps - enables precise match to system supply rails without external resistors. |
| Four reset timeout options | 1 ms / 20 ms / 140 ms / 1120 ms (min) - accommodates fast-boot MCUs and slow-start analog subsystems. |
| Four watchdog timeout options | 6.3 ms / 102 ms / 1.6 s / 25.6 s (typ) - supports real-time response or long-cycle firmware supervision. |
| Guaranteed reset validity to 1 V | Ensures deterministic reset behavior during undervoltage conditions common in battery discharge or cold cranking. |
| Internal MR pull-up resistor | 52 kΩ - eliminates need for external pull-up; enables direct connection of push-button to ground for manual reset. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
|
Use Scenario: Monitors 3.3 V microcontroller supply in programmable logic controller operating in factory environments with EMI and thermal cycling. IC Role / Device Role / Timing Role: Provides power-on reset, brownout protection, and watchdog supervision to prevent runaway logic during communication faults or sensor failures. Use Value: Open-drain RESET allows integration into existing 5 V reset bus; 140 ms timeout ensures full FPGA configuration before release; 1.6 s watchdog prevents lockup during Modbus RTU retries. |
Use Scenario: Supervises ARM Cortex-M4 in battery-powered infusion pump requiring FDA-grade reliability and fault recovery. IC Role / Device Role / Timing Role: Generates clean reset on battery insertion, detects MCU hang during motor control loops, and supports manual reset via front-panel button. Use Value: 5 µA quiescent current extends battery life; 3.0 V threshold matches Li-ion discharge profile; dual RESET outputs interface with both MCU and safety monitor IC. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Embedded in DIN-rail meter with isolated RS-485, RTC, and tamper-detection circuitry operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Ensures deterministic boot after power restoration following grid dips; watchdog guards against firmware corruption from ESD events. Use Value: −40°C to +85°C rating covers outdoor deployment; 2.5% threshold tolerance maintains accuracy over lifetime; open-drain output interfaces with isolated reset translator. |
Use Scenario: Manages reset sequencing for microcontroller and CAN transceiver in door module exposed to automotive load dump and cold crank. IC Role / Device Role / Timing Role: Asserts reset during VCC sag below 3.0 V; monitors software health via WDI; supports manual reset for service mode entry. Use Value: Valid reset down to 1 V prevents spurious resets during cold-crank transients; 100 ns MR glitch rejection suppresses switch bounce; 5-lead SOT-23 saves PCB space in tight modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM6320AY30ARJZ-R7 | Same 3.0 V threshold, 140 ms reset timeout, and 1.6 s watchdog, but lacks active-high RESET output (only open-drain RESET). | Suitable where dual-polarity reset signaling is unnecessary and board layout favors single-output simplicity. | Select ADM6320AY30ARJZ-R7 if only one reset signal is required and cost optimization is prioritized. |
| TPS3808G30DBVR | 3.0 V threshold, 200 ms reset timeout (min), no watchdog timer, push-pull active-low RESET, 1.8–6 V VCC range. | Applicable in non-watchdog systems where only power-supply monitoring is needed, e.g., simple microcontroller boot. | Choose TPS3808G30DBVR when watchdog functionality is omitted from system architecture and higher VCC tolerance is required. |
Compared with ADM6320AY30ARJZ-R7, ADM6321AY30ARJZ-R7 adds an active-high push-pull RESET output for redundancy or mixed-logic interfacing; compared with TPS3808G30DBVR, it provides essential watchdog supervision at the cost of slightly higher complexity and narrower VCC range.
Availability
ADM6321AY30ARJZ-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, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM6321AY30ARJZ-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 industrial and portable environments, emphasizing low power, wide temperature operation, and integrated watchdog reliability without external timing components.
FAQ
What is the reset threshold voltage and tolerance for ADM6321AY30ARJZ-R7?
The ADM6321AY30ARJZ-R7 has a nominal reset threshold of 3.00 V, with a tolerance of ±2.5% over the full industrial temperature range (−40°C to +85°C). This value is factory-trimmed and specified in Table 2 of the Rev. I datasheet. The threshold remains stable with a temperature coefficient of 40 ppm/°C, ensuring consistent brownout detection across operating conditions.
Does ADM6321AY30ARJZ-R7 include a manual reset input?
No, ADM6321AY30ARJZ-R7 does not include a manual reset (MR) input. Per Table 1 and Figure 5 of the datasheet, ADM6321 is configured with watchdog input (WDI) and dual reset outputs (open-drain active-low and push-pull active-high), but omits the MR pin. This distinguishes it from ADM6316/ADM6317/ADM6320 variants that feature MR.
What watchdog timeout options are supported by ADM6321AY30ARJZ-R7?
The "Y" suffix in ADM6321AY30ARJZ-R7 indicates a typical watchdog timeout of 1.6 seconds, with min/typ/max values of 1.12 s / 1.6 s / 2.24 s. This option is confirmed in Table 7 and the Ordering Guide entry ADM6321AY30ARJZ-R7. The watchdog timer clears on any logic transition at WDI and asserts reset if unattended beyond this period.
How is the reset timeout period selected for ADM6321AY30ARJZ-R7?
The "C" in ADM6321AY30ARJZ-R7 denotes the reset timeout option: 140 ms (minimum), with typical and maximum values of 200 ms and 280 ms respectively. This is defined in Table 6 and verified in the Ordering Guide. The timeout begins when VCC rises above the reset threshold and holds RESET asserted for the full duration before deassertion.
What package type and marking code does ADM6321AY30ARJZ-R7 use?
ADM6321AY30ARJZ-R7 uses a 5-lead SOT-23 package (JEDEC MO-178-AA, Analog Devices package code RJ-5) and is marked "M4Q" on the top surface. The "RJZ" in the part number confirms RoHS-compliant 3000-piece tape-and-reel packaging (R7), and "A" specifies the −40°C to +85°C temperature grade.
ADM6321AY30ARJZ-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:
- 3V
- 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
ADM6321AY30ARJZ-R7 FAQ
1.How can I place an order for ADM6321AY30ARJZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM6321AY30ARJZ-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 ADM6321AY30ARJZ-R7 reliable?
The price and inventory of ADM6321AY30ARJZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM6321AY30ARJZ-R7 is usually 5 days.
3.What payment methods are accepted for ADM6321AY30ARJZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM6321AY30ARJZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM6321AY30ARJZ-R7?
ADM6321AY30ARJZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM6321AY30ARJZ-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 ADM6321AY30ARJZ-R7?
For technical support, including ADM6321AY30ARJZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM6321AY30ARJZ-R7 requirements.
6.How does Aetrix verify that ADM6321AY30ARJZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM6321AY30ARJZ-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 ADM6321AY30ARJZ-R7 meets industry standards.
7.What is the process for return or replacement of ADM6321AY30ARJZ-R7?
All ADM6321AY30ARJZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM6321AY30ARJZ-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 ADM6321AY30ARJZ-R7 part is unused and in its original packaging.
Return procedure for ADM6321AY30ARJZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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