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Analog Devices Inc. ADM709RARZ
- Part No.:
- ADM709RARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM709RARZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:479
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Product details
Overview
ADM709RARZ from Analog Devices is a precision power supply monitor IC with active-low reset output, 2.63 V threshold, 140 ms minimum power-on reset pulse, operation down to 1 V supply, and SOIC-8 package. It ensures reliable microprocessor reset during power-up, brownout, and power-down in embedded control systems.
For engineers reviewing the ADM709RARZ datasheet, ADM709RARZ pinout, ADM709RARZ application, or ADM709RARZ equivalent, key selection criteria include reset threshold accuracy, guaranteed reset assertion below 1 V, 140 ms timeout stability over –40°C to +85°C, and compatibility with bidirectional µP reset lines requiring series resistance.
Technical Context
The ADM709RARZ implements a bandgap-based voltage comparator with internal timing circuitry to generate a minimum 140 ms active-low reset pulse after VCC rises above 2.63 V. Its RESET output remains functional down to VCC = 1.0 V, enabling robust shutdown sequencing.
It features glitch immunity against short VCC transients and supports interface to bidirectional microprocessor reset pins via external series resistor (e.g., 4.7 kΩ). No external capacitor is required for basic operation, though 0.1 µF at VCC improves noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±0.08 V - precisely monitors +3 V and +2.8 V rails without external components |
| Power-On Reset Pulse | 140 ms (min) - ensures µP clock and supply stabilization before release |
| VCC Operating Range | 1.0 V to 5.5 V - enables reset assertion during deep brownout and controlled shutdown |
| Supply Current | 35 µA (typ) at VCC < 3.6 V - ultra-low quiescent draw for battery-backed systems |
| RESET Output Drive | Sink capability: 1.2 mA @ 0.3 V - sufficient to drive TTL/CMOS inputs directly |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
ADM709RARZ is housed in an 8-lead SOIC (SO-8) package with standard JEDEC MS-012AC dimensions (width: 3.90 mm, length: 4.90 mm, height: 1.75 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect | Internally unconnected; must remain floating or grounded per layout best practice |
| 2 | VCC Supply Input | Main power rail input; decoupling capacitor (0.1 µF) recommended adjacent to pin |
| 3 | GND | Analog ground reference; requires low-impedance connection to system ground plane |
| 7 | RESET Output | Active-low open-drain compatible output; sinks current when asserted |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63 V threshold | Enables accurate monitoring of +2.8 V to +3.0 V logic supplies without trimming resistors |
| 140 ms minimum reset timeout | Guarantees µP core and peripheral initialization completes before release |
| Operation down to 1.0 V VCC | Ensures deterministic reset hold during final stage of power collapse |
| Glitch-immune VCC sensing | Rejects sub-20 µs supply transients, preventing spurious resets in noisy environments |
| SOIC-8 footprint | Direct drop-in replacement for legacy MAX709R and other 8-pin supervisory ICs |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power cycling during CAN bus wake-up events with transient-rich 12 V supply. IC Role / Device Role / Timing Role: Supervisory reset generator asserting low until stable 3.3 V rail is confirmed and µC internal clocks lock. Use Value: Prevents firmware crash by holding µC in reset during <100 ms supply dip caused by relay switching or load dump. | Use Scenario: Cold-cranking condition where battery voltage drops to 2.7 V while cranking engine. IC Role / Device Role / Timing Role: Voltage monitor triggering hard reset when VCC falls below 2.63 V, then holding reset for ≥140 ms post-recovery. Use Value: Eliminates need for external RC timing network; guarantees safe reinitialization after cranking-induced brownout. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Battery backup switchover during AC mains failure with tight safety-critical boot timing. IC Role / Device Role / Timing Role: Dual-role supervisor-asserting reset on main supply dropout and enabling clean restart when backup rail stabilizes. Use Value: Maintains reset assertion down to 1.0 V, ensuring µC remains held through full battery decay phase before safe shutdown. | Use Scenario: Tamper detection event causing abrupt 3.3 V rail collapse during meter firmware update. IC Role / Device Role / Timing Role: Fail-safe reset initiator that prevents partial writes or corrupted flash state during power interruption. Use Value: 2.63 V threshold matches typical LDO output tolerance; 140 ms timeout exceeds EEPROM write cycle max duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX709RCSA+ | 2.63 V threshold, 200 ms reset timeout, 10 µA quiescent current, same SO-8 package | Higher timeout margin; lower IQ enables longer battery life in always-on monitoring | Preferred for ultra-low-power battery systems where extended reset hold adds safety margin |
| TPS3808G12DBVR | 1.225 V adjustable threshold (via external resistor), 200 ms timeout, 1.1 µA IQ, SOT-23-5 | Requires external resistor network; smaller footprint but no fixed 2.63 V option | Chosen when board space is constrained and threshold tuning is acceptable |
Compared with MAX709RCSA+ and TPS3808G12DBVR, the ADM709RARZ offers factory-trimmed 2.63 V accuracy without external components, guaranteed 1 V operation, and proven industrial temperature reliability-making it optimal for fixed-threshold, high-noise, or safety-critical reset applications.
Availability
ADM709RARZ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM709RARZ 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, founded in 1965 and headquartered in Wilmington, MA.
The ADM709 belongs to Analog Devices' precision supervisory IC product line, designed specifically for deterministic power-on reset, brownout protection, and fail-safe microprocessor initialization in harsh industrial and automotive environments.
FAQ
What is the exact reset threshold voltage of the ADM709RARZ?
The ADM709RARZ has a factory-trimmed reset threshold of 2.63 V, with a guaranteed range of 2.55 V to 2.70 V across –40°C to +85°C. This value is specified in the Absolute Maximum Ratings table and confirmed in the ADM709–SPECIFICATIONS section under "Reset Threshold" for suffix R. The ADM709RARZ uses laser-trimmed bandgap circuitry to achieve this precision without external components.
Does the ADM709RARZ assert reset when VCC drops below 1 V?
Yes-the ADM709RARZ RESET output remains actively driven low down to VCC = 1.0 V. Below 1 V, the internal circuitry cannot guarantee output state; however, a 100 kΩ pull-down resistor between RESET and GND ensures the line stays low during deep undervoltage. This behavior is explicitly documented in the "RESET at Voltages < 1 V" section of the datasheet.
Can the ADM709RARZ be used with microcontrollers having bidirectional reset pins?
Yes-the ADM709RARZ supports bidirectional µP reset lines such as those found on MC68HC11. A 4.7 kΩ series resistor between ADM709RARZ's RESET pin and the µP reset pin prevents signal contention. This configuration is illustrated in Figure 6 of the datasheet and validated for reliable handshaking during both power-up and software-initiated reset sequences.
What is the minimum power-on reset pulse width of the ADM709RARZ?
The ADM709RARZ guarantees a minimum reset pulse width of 140 ms after VCC rises above the 2.63 V threshold. Typical duration is 280 ms, and maximum is 380 ms. This timing ensures full stabilization of crystal oscillators, PLLs, and internal µP logic before release-critical for deterministic boot in industrial and automotive applications using the ADM709RARZ.
Is the ADM709RARZ pin-compatible with the MAX709R?
Yes-the ADM709RARZ is a functional and pin-compatible upgrade for the MAX709R in SO-8 packaging. Both share identical pinout (VCC on Pin 2, GND on Pin 3, RESET on Pin 7, NC on Pins 1/4/5/6/8), same 2.63 V threshold, and overlapping electrical specs. Analog Devices positions the ADM709 series as a direct replacement, confirmed in the "Upgrade for MAX709" feature list and ordering guide.
ADM709RARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM709RARZ FAQ
1.How can I place an order for ADM709RARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM709RARZ 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 ADM709RARZ reliable?
The price and inventory of ADM709RARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM709RARZ is usually 5 days.
3.What payment methods are accepted for ADM709RARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM709RARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM709RARZ?
ADM709RARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM709RARZ 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 ADM709RARZ?
For technical support, including ADM709RARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM709RARZ requirements.
6.How does Aetrix verify that ADM709RARZ is sourced from the original manufacturer or authorized distributors?
All ADM709RARZ 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 ADM709RARZ meets industry standards.
7.What is the process for return or replacement of ADM709RARZ?
All ADM709RARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM709RARZ, 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 ADM709RARZ part is unused and in its original packaging.
Return procedure for ADM709RARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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