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Analog Devices Inc. ADM709SARZ
- Part No.:
- ADM709SARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM709SARZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:557
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Product details
Overview
ADM709SARZ from Analog Devices is a precision power supply monitor IC with active-low reset output, 2.93 V threshold, 140 ms minimum power-on reset pulse, and operation down to 1 V supply voltage - used for reliable microprocessor reset in embedded systems with +3 V rails.
For engineers reviewing the ADM709SARZ datasheet, ADM709SARZ pinout, ADM709SARZ application, or ADM709SARZ equivalent, key selection criteria include reset threshold accuracy, guaranteed reset assertion below 1 V, glitch-immune VCC monitoring, and SOIC-8 compatibility with legacy MAX709-based designs.
Technical Context
The ADM709SARZ implements a comparator-based reset generator with internal timing circuitry that holds RESET low for ≥140 ms after VCC rises above 2.93 V (±75 mV), ensuring stable processor initialization. It features no external components required for basic operation and maintains functional RESET output down to VCC = 1.0 V.
Its architecture includes built-in glitch immunity on VCC, eliminating spurious resets from transient supply noise, and supports bidirectional µP reset lines via optional series resistor (e.g., 4.7 kΩ). The device draws only 35–200 µA quiescent current across temperature and supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±75 mV - precisely matches +3 V system rails; ensures reset release only after stable regulation. |
| Power-On Reset Pulse | 140 ms min - provides sufficient time for +3 V LDOs and microcontrollers to stabilize post-power-up. |
| VCC Operating Range | 1.0 V to 5.5 V - enables valid reset signaling even during deep brownout or battery sag down to 1 V. |
| Quiescent Current | 35 µA typ at VCC < 3.6 V - minimizes standby power impact in always-on monitoring applications. |
| RESET Output Drive | 1.2 mA sink @ 0.3 V - directly interfaces standard CMOS/TTL reset inputs without external buffer. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
ADM709SARZ 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 - no routing required. |
| 2 | VCC Supply Input | Primary power input for monitoring; accepts 1.0–5.5 V; requires local 0.1 µF decoupling for glitch immunity. |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection to system ground plane. |
| 7 | RESET Output | Active-low open-drain compatible output; sinks 1.2 mA while asserted; pulls high via external pull-up in most µP interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93 V threshold | Matches nominal +3 V supply rails with ±2.6% tolerance - eliminates need for external resistor divider calibration. |
| 140 ms minimum reset timeout | Guaranteed hold time ensures µP clocks, PLLs, and memory initialize fully before release - no external RC timing network needed. |
| Operation down to 1 V VCC | Delivers valid RESET signal during severe brownout or battery discharge - prevents undefined µP state during shutdown. |
| Glitch-immune VCC sensing | Rejects sub-20 µs transients on supply rail - avoids false resets caused by switching noise or load dumps. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power cycling during CAN bus wake-up or ignition-on events in harsh electrical environments. IC Role / Device Role / Timing Role: System-level power-on and brownout reset supervisor ensuring deterministic µP boot sequence. Use Value: Prevents firmware lockup or register corruption when 3.3 V domain sags below 2.93 V during load switching. | Use Scenario: Monitoring 3.3 V microcontroller supply in door module exposed to load dump and cold cranking. IC Role / Device Role / Timing Role: Fault-tolerant reset generator with 1 V operational floor and glitch immunity. Use Value: Maintains reset assertion through 12 V battery dip to 6 V, where 3.3 V LDO still delivers >1 V to ADM709SARZ. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Battery-backed operation with gradual voltage decay during main power loss. IC Role / Device Role / Timing Role: Brownout detector and controlled reset initiator for safety-critical ARM Cortex-M core. Use Value: Asserts RESET before 3.3 V rail drops below µP minimum operating voltage (typically 2.7 V), enabling safe shutdown logging. | Use Scenario: M-Bus or PLC communication interface powered from isolated 3.3 V supply with intermittent surges. IC Role / Device Role / Timing Role: Immune reset supervisor preventing spurious reboots during EMI-induced supply transients. Use Value: Eliminates field-reported "ghost resets" caused by 100 ns–1 µs spikes on 3.3 V rail from coupling into metering ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX709SUR+ | 2.93 V threshold, same SO-8 package, but 200 ms min reset timeout and higher 50 µA typical supply current. | Compatible in footprint and function, but longer reset pulse may delay system boot in time-critical applications. | Select when extended reset hold time improves reliability in noisy power environments. |
| TPS3808G33DBVR | 2.93 V threshold, SOT-23-5 package, 200 ms fixed timeout, 1.6 µA quiescent current, but requires external pull-up on RESET. | Smaller footprint and ultra-low power, but lacks 1 V operation and SO-8 drop-in compatibility. | Select for space-constrained, battery-powered designs where 1 V brownout support is not required. |
Compared with MAX709SUR+ and TPS3808G33DBVR, the ADM709SARZ uniquely combines SO-8 pin compatibility, guaranteed 1 V operation, and industry-standard 140 ms reset timing - making it optimal for industrial upgrades of legacy MAX709-based boards requiring minimal layout change and robust low-voltage reset behavior.
Availability
ADM709SARZ 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 long production lifecycles.
Supply support for ADM709SARZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The ADM709 belongs to Analog Devices' precision power monitoring product line, designed specifically for deterministic reset generation in microprocessor-based systems operating from 3 V and 5 V rails.
FAQ
What is the exact reset threshold voltage for ADM709SARZ?
The ADM709SARZ has a nominal reset threshold of 2.93 V, with a guaranteed range of 2.85 V to 3.00 V over –40°C to +85°C. This value is laser-trimmed at wafer test and specified in the Absolute Maximum Ratings table of the official Analog Devices datasheet Rev. 0. The ADM709SARZ uses this precise threshold to monitor +3 V supply rails without external calibration.
Does ADM709SARZ support operation below 1 V VCC?
No - the ADM709SARZ RESET output is guaranteed functional only down to VCC = 1.0 V. Below that, the internal circuitry cannot maintain valid logic levels. If operation below 1 V is required, a 100 kΩ pull-down resistor between RESET and GND (as shown in Figure 5 of the datasheet) ensures the output remains low during deep brownout. The ADM709SARZ itself does not assert RESET below 1 V.
Is ADM709SARZ pin-compatible with MAX709?
Yes - the ADM709SARZ is a direct functional and pin-compatible upgrade for the MAX709 in SO-8 packages. Both share identical pin 2 (VCC), pin 3 (GND), pin 7 (RESET), and no-connect pins 1/4/5/6/8. No PCB changes are required when replacing MAX709 with ADM709SARZ, and the 2.93 V threshold matches MAX709S variants.
What is the minimum power-on reset pulse width of ADM709SARZ?
The ADM709SARZ guarantees a minimum power-on reset pulse width of 140 ms after VCC rises above the 2.93 V threshold. Typical duration is 280 ms, and maximum is 380 ms under worst-case conditions. This timing is internally generated and requires no external components - a key design advantage over RC-based reset circuits.
Can ADM709SARZ drive a microcontroller reset pin directly?
Yes - the ADM709SARZ RESET output can directly drive standard CMOS/TTL microcontroller reset inputs. It sinks up to 1.2 mA while asserted (at ≤0.3 V), meeting typical µP reset pin requirements. For bidirectional reset lines (e.g., MC68HC11), a 4.7 kΩ series resistor is recommended to prevent contention - as documented in Figure 6 of the ADM709SARZ datasheet.
ADM709SARZ 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:
- 2.93V
- 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
ADM709SARZ FAQ
1.How can I place an order for ADM709SARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM709SARZ 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 ADM709SARZ reliable?
The price and inventory of ADM709SARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM709SARZ is usually 5 days.
3.What payment methods are accepted for ADM709SARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM709SARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM709SARZ?
ADM709SARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM709SARZ 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 ADM709SARZ?
For technical support, including ADM709SARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM709SARZ requirements.
6.How does Aetrix verify that ADM709SARZ is sourced from the original manufacturer or authorized distributors?
All ADM709SARZ 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 ADM709SARZ meets industry standards.
7.What is the process for return or replacement of ADM709SARZ?
All ADM709SARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM709SARZ, 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 ADM709SARZ part is unused and in its original packaging.
Return procedure for ADM709SARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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