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Analog Devices Inc. ADM709LARZ
- Part No.:
- ADM709LARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM709LARZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:369
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Product details
Overview
ADM709LARZ from Analog Devices is a precision power supply monitor IC with active-low reset output, 4.65 V threshold, 140 ms minimum power-on reset pulse, and operation down to 1 V supply voltage; used in microprocessor systems to ensure reliable startup and brownout protection.
For engineers reviewing the ADM709LARZ datasheet, ADM709LARZ pinout, ADM709LARZ application, or ADM709LARZ equivalent, key selection criteria include reset threshold accuracy, guaranteed reset assertion below 1 V, 140 ms timeout stability over –40°C to +85°C, SOIC-8 package compatibility, and direct upgrade path from MAX709.
Technical Context
The ADM709LARZ integrates a precision voltage comparator and internal timer to generate a clean, glitch-immune active-low RESET signal during power-up, power-down, and brownout events. Its reset threshold is fixed at 4.65 V ±0.15 V, with guaranteed operation across VCC = 1.0 V to 5.5 V.
RESET remains asserted for ≥140 ms after VCC rises above threshold, and stays functional down to VCC = 1 V - enabling robust shutdown sequencing. The device features no-connect pins (1, 4, 5, 6, 8), single-supply operation, and immunity to short VCC transients without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±0.15 V - ensures reliable detection of +5 V supply undervoltage before microprocessor instability occurs. |
| Power-On Reset Pulse | ≥140 ms - provides sufficient time for +5 V rail stabilization and µP internal clock lock prior to release. |
| VCC Operating Range | 1.0 V to 5.5 V - enables valid RESET assertion during deep brownout and controlled shutdown below 1.2 V. |
| Supply Current | 35 µA typical at VCC < 3.6 V - minimizes standby power impact in battery-backed or low-power embedded systems. |
| RESET Output Drive | Sink capability: 3.2 mA at 0.4 V - directly interfaces with standard TTL/CMOS µP reset inputs without buffering. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade microcontroller applications including automotive ECUs and programmable logic controllers. |
Pinout & Package
ADM709LARZ is housed in an 8-lead SOIC (SO-8) package with standard JEDEC MS-012AC dimensions (4.90 mm × 3.90 mm × 1.75 mm). Pin 1 is marked by a beveled corner or dot; pins 1, 4, 5, 6, and 8 are internally unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 2) | Positive supply input | Accepts 1.0 V–5.5 V; powers internal comparator and timer; requires local 0.1 µF bypass capacitor for glitch immunity. |
| GND (Pin 3) | Ground reference | 0 V return for all internal circuitry; must be connected to system ground plane with low-inductance path. |
| RESET (Pin 7) | Active-low reset output | Open-drain compatible; sinks up to 3.2 mA; asserts low during brownout and holds for ≥140 ms on power-up. |
| NC (Pins 1,4,5,6,8) | No-connect terminals | Not bonded; must remain unconnected on PCB to avoid parasitic coupling or ESD path disruption. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65 V threshold | ±0.15 V tolerance ensures consistent +5 V supply monitoring across temperature and unit-to-unit variation. |
| 140 ms min power-on reset | Guaranteed minimum timeout eliminates need for external RC timing components in µP reset circuits. |
| Operation down to 1 V | Enables fail-safe reset assertion during deep brownout, supporting graceful shutdown in critical control systems. |
| Glitch-immune VCC sensing | Internal filtering rejects transients ≤1 µs, preventing spurious resets from switching noise or load dumps. |
| SOIC-8 footprint | Standard 150 mil width package allows drop-in replacement of legacy supervisory ICs in space-constrained designs. |
Applications
| Industrial PLC Controllers | Automotive Engine Control Units |
|---|---|
Use Scenario: Power cycling during vehicle ignition or factory floor voltage sags. IC Role / Device Role / Timing Role: Supervisory reset generator asserting low during brownout and holding for ≥140 ms on recovery. Use Value: Prevents corrupted firmware execution by ensuring µP remains held in reset until +5 V rail stabilizes post-sag. | Use Scenario: Cold-cranking condition where battery voltage drops to 6–8 V while cranking engine. IC Role / Device Role / Timing Role: Voltage monitor detecting undervoltage on +5 V regulator output feeding ECU microcontroller. Use Value: Maintains RESET assertion down to 1 V supply, guaranteeing safe shutdown even as main rail collapses. |
| Medical Diagnostic Equipment | Network Router Management Processors |
Use Scenario: Unplanned AC loss followed by UPS switchover with brief interruption. IC Role / Device Role / Timing Role: Brownout detector triggering controlled reboot sequence upon restoration of stable +5 V. Use Value: 140 ms minimum reset pulse prevents premature processor wake-up before power integrity is confirmed. | Use Scenario: Hot-swap of line cards causing localized +5 V droop on management subsystem. IC Role / Device Role / Timing Role: Standalone reset supervisor for ARM-based management SoC with bidirectional reset pin. Use Value: 4.7 kΩ series resistor interface (per Figure 6) avoids contention with SoC's internal pull-up during reset release. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX709CSA+ | Same 4.65 V threshold, but 200 ms min reset timeout; higher quiescent current (50 µA typ); not specified for VCC < 1.2 V operation. | Valid for +5 V systems requiring longer reset hold time; unsuitable for sub-1.2 V brownout detection. | Select MAX709CSA+ only if extended reset duration is required and 1 V operation is unnecessary. |
| TPS3808G33DBVR | Adjustable threshold via external resistor divider; 3.3 V fixed option available; 200 ms default timeout; supports VCC down to 0.9 V. | Requires external components for threshold setting; better suited for custom voltage rails or multi-rail supervision. | Choose TPS3808G33DBVR when design flexibility or tighter threshold tolerance (<±0.5%) is prioritized over simplicity. |
Compared with MAX709CSA+ and TPS3808G33DBVR, the ADM709LARZ offers the shortest qualification path for legacy +5 V µP systems needing guaranteed 1 V operation and minimal BOM count - no resistors or capacitors required beyond bypass.
Availability
ADM709LARZ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive engine control units, medical diagnostic equipment, and network router management processors requiring stable component supply and long-term lifecycle support.
Supply support for ADM709LARZ 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 ADM709 belongs to Analog Devices' precision power monitoring product line, designed specifically for reliable microprocessor reset generation in industrial, automotive, and medical systems where deterministic power-fail response is mandatory.
FAQ
What is the exact reset threshold voltage of the ADM709LARZ?
The ADM709LARZ has a nominal reset threshold of 4.65 V, with a guaranteed range of 4.50 V to 4.75 V across –40°C to +85°C. This value is laser-trimmed at wafer test and does not require external calibration. The ADM709LARZ threshold is optimized for monitoring standard +5 V supplies in microprocessor systems where marginal undervoltage must trigger immediate reset assertion.
Does the ADM709LARZ support operation below 1.2 V supply voltage?
Yes, the ADM709LARZ RESET output remains fully functional with VCC as low as 1.0 V, per the Absolute Maximum Ratings and Electrical Specifications tables. Below 1.0 V, the RESET output is not guaranteed - a 100 kΩ pull-down resistor to GND (per Figure 5) ensures it stays low during deep collapse. This behavior makes the ADM709LARZ uniquely suitable for fail-safe shutdown in critical power-loss scenarios.
Is the ADM709LARZ pin-compatible with the MAX709?
Yes, the ADM709LARZ is a direct pin-compatible upgrade for the MAX709 in SO-8 packages, sharing identical pinout (VCC=2, GND=3, RESET=7), same 4.65 V threshold variant, and compatible drive strength. No PCB changes are required. However, the ADM709LARZ improves on MAX709 by specifying guaranteed operation down to 1 V and tighter threshold tolerance (±0.15 V vs. ±0.25 V).
What is the minimum power-on reset pulse width of the ADM709LARZ?
The ADM709LARZ guarantees a minimum RESET active time-out period of 140 ms after VCC rises above the 4.65 V threshold. Typical duration is 280 ms, and maximum is 380 ms. This fixed internal timer eliminates reliance on external RC networks, reducing component count and improving consistency across temperature and unit variance in the ADM709LARZ design.
Can the ADM709LARZ be used with microcontrollers that have bidirectional reset pins?
Yes, the ADM709LARZ can interface safely with bidirectional reset pins (e.g., MC68HC11) using a 4.7 kΩ series resistor between RESET (Pin 7) and the µP reset line, as shown in Figure 6 of the datasheet. This prevents signal contention when the microcontroller drives the line high while ADM709LARZ is asserting low, ensuring reliable reset coordination without latch-up risk.
ADM709LARZ 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:
- 4.65V
- 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
ADM709LARZ FAQ
1.How can I place an order for ADM709LARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM709LARZ 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 ADM709LARZ reliable?
The price and inventory of ADM709LARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM709LARZ is usually 5 days.
3.What payment methods are accepted for ADM709LARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM709LARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM709LARZ?
ADM709LARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM709LARZ 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 ADM709LARZ?
For technical support, including ADM709LARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM709LARZ requirements.
6.How does Aetrix verify that ADM709LARZ is sourced from the original manufacturer or authorized distributors?
All ADM709LARZ 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 ADM709LARZ meets industry standards.
7.What is the process for return or replacement of ADM709LARZ?
All ADM709LARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM709LARZ, 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 ADM709LARZ part is unused and in its original packaging.
Return procedure for ADM709LARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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