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Analog Devices Inc. ADM709LARZ-REEL
- Part No.:
- ADM709LARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM709LARZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,002
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Product details
Overview
ADM709LARZ-REEL 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. It serves as a system supervisory circuit for microprocessor reset generation during power-up, brownout, and power-down in industrial embedded systems.
For engineers reviewing the ADM709LARZ-REEL datasheet, ADM709LARZ-REEL pinout, ADM709LARZ-REEL application, or ADM709LARZ-REEL equivalent, key selection factors include reset threshold accuracy (±0.15 V), guaranteed RESET assertion below 1 V VCC, SOIC-8 package compatibility, and 35 µA quiescent current at low supply voltages.
Technical Context
The ADM709LARZ-REEL integrates a precision voltage comparator and internal timer to generate a clean, glitch-immune active-low reset signal. Its reset generator holds RESET low for ≥140 ms after VCC rises above 4.65 V, with timing tolerance independent of supply ramp rate.
VCC monitoring operates across 1.0 V to 5.5 V, enabling reliable reset assertion even during deep brownout. The device features no-connect pins (1, 4, 5, 6, 8) and requires no external components for basic operation-only optional 0.1 µF bypass capacitor on VCC for enhanced noise immunity.
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 CPU clock stabilization and memory initialization after power-up |
| Minimum Operating VCC | 1.0 V - guarantees RESET remains asserted during deep brownout down to near-zero supply conditions |
| Quiescent Current | 35 µA (typ) at VCC < 3.6 V - enables ultra-low-power supervision in battery-backed or energy-constrained systems |
| RESET Output Drive | 3.2 mA sink capability at VCC ≥ threshold - directly interfaces with standard TTL/CMOS microprocessor reset inputs |
| Operating Temperature | –40°C to +85°C - supports industrial-grade reliability without derating in harsh ambient environments |
Pinout & Package
ADM709LARZ-REEL 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; leads are gull-wing, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect | Internally unconnected - must remain floating; no PCB routing or termination required |
| 2 | VCC Supply Input | Primary power rail input (1.0–5.5 V); requires local 0.1 µF ceramic decoupling capacitor |
| 3 | GND | Analog ground reference - must connect to system ground plane with low-inductance path |
| 7 | RESET Output | Active-low open-drain output - sinks up to 3.2 mA; requires external pull-up for logic-high state |
Key Features
| Feature | Design Value |
|---|---|
| Precision Voltage Monitoring | 4.65 V threshold with ±0.15 V tolerance over full temperature range ensures consistent reset point across operating conditions |
| Guaranteed Low-Voltage Operation | RESET remains functional down to 1.0 V VCC - eliminates need for auxiliary supervisor in ultra-low-brownout scenarios |
| Glitch-Immune Architecture | Internal filtering rejects transients ≤20 µs on VCC - prevents spurious resets from switching noise or ESD coupling |
| Minimal External Components | Operates with only VCC decoupling capacitor - reduces BOM count and PCB area vs. discrete resistor-divider supervisors |
Applications
| Industrial PLC Controllers | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers exposed to variable AC line conditions and electromagnetic interference. IC Role / Device Role / Timing Role: Supervisory reset generator ensuring deterministic microcontroller restart after brownout or transient dropout. Use Value: Prevents firmware corruption by enforcing ≥140 ms reset hold time during unstable 24 V DC input recovery. | Use Scenario: Critical power monitoring in portable ultrasound and imaging devices where battery voltage sag must trigger controlled shutdown. IC Role / Device Role / Timing Role: Low-voltage detector asserting RESET before analog front-end bias rails collapse below operational limits. Use Value: Maintains RESET assertion down to 1.0 V VCC, enabling safe state capture before complete power loss. |
| Automotive Body Control Modules | Telecom Base Station Power Management |
Use Scenario: Cold-cranking and load-dump resilience in 12 V automotive subsystems with wide input voltage excursions. IC Role / Device Role / Timing Role: System-level reset supervisor interfacing with CAN-enabled microcontrollers via buffered bidirectional reset lines. Use Value: 4.65 V threshold aligns with nominal +5 V logic rail monitoring; 35 µA quiescent current minimizes parasitic drain on standby batteries. | Use Scenario: Redundant power supply monitoring in distributed telecom infrastructure requiring fail-safe reboot on primary DC feed failure. IC Role / Device Role / Timing Role: Primary reset source for ARM-based baseband processors, synchronized with backup battery switchover circuits. Use Value: SOIC-8 footprint allows drop-in replacement in legacy designs; 110°C/W θJA enables thermal stability in high-density power modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX709LCSA+ | Same 4.65 V threshold, but higher 100 µA typical quiescent current; 200 ms min reset timeout | Designed for commercial temperature range (0°C to +70°C) only - not rated for industrial –40°C to +85°C operation | Select when cost sensitivity outweighs extended temperature support and ultra-low IQ |
| TPS3808G33DBVR | 3.3 V fixed threshold (not 4.65 V); adjustable delay option; 1.6 µA IQ; SOT-23-5 package | Targets +3.3 V rail monitoring - incompatible for +5 V system reset without external divider network | Select only if redesigning for lower-voltage rail supervision and space-constrained layouts |
Compared with MAX709LCSA+ and TPS3808G33DBVR, the ADM709LARZ-REEL uniquely combines industrial temperature rating, 4.65 V threshold, sub-1 V reset validity, and SOIC-8 compatibility - making it the sole choice for legacy +5 V microprocessor systems requiring robust brownout immunity without layout changes.
Availability
ADM709LARZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, automotive body control modules, and telecom base station power management requiring stable component supply and long-term lifecycle continuity.
Supply support for ADM709LARZ-REEL 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 voltage supervisor product line, engineered specifically for deterministic microprocessor reset generation in industrial, automotive, and medical systems where power integrity is mission-critical.
FAQ
What is the exact reset threshold voltage of the ADM709LARZ-REEL?
The ADM709LARZ-REEL has a nominal reset threshold of 4.65 V, with a guaranteed range of 4.50 V to 4.75 V across the full –40°C to +85°C operating temperature range. This specification is validated per the ADM709 datasheet Table I and applies exclusively to the 'L' suffix variant, confirming its suitability for +5 V supply monitoring without external calibration.
Does the ADM709LARZ-REEL require external components to function?
The ADM709LARZ-REEL operates with only a 0.1 µF ceramic capacitor between VCC (Pin 2) and GND (Pin 3) for noise immunity. No resistive divider, pull-up, or timing components are needed. Its internal timer generates the 140 ms reset pulse, and the RESET output (Pin 7) is open-drain - requiring an external pull-up resistor only if interfacing with CMOS inputs.
Can the ADM709LARZ-REEL assert RESET when VCC drops below 1 V?
The ADM709LARZ-REEL guarantees RESET functionality down to 1.0 V VCC, but does not actively drive RESET low below that level. To maintain a defined logic-low state during sub-1 V brownout, a 100 kΩ pull-down resistor from RESET (Pin 7) to GND is recommended - as specified in the ADM709 datasheet Figure 5.
Is the ADM709LARZ-REEL pin-compatible with the MAX709 series?
The ADM709LARZ-REEL shares identical SOIC-8 pinout and functional assignment with the MAX709L - including VCC (Pin 2), GND (Pin 3), and RESET (Pin 7). However, it is not a drop-in replacement due to differences in quiescent current, thermal characteristics, and absolute maximum ratings; board-level validation is required before substitution.
What is the minimum VCC voltage at which the ADM709LARZ-REEL remains operational?
The ADM709LARZ-REEL maintains full reset functionality with VCC as low as 1.0 V, as confirmed in the "RESET at Voltages < 1 V" section of the datasheet. Below 1.0 V, the internal circuitry ceases operation, though the RESET output can be held low externally using a pull-down resistor to ensure microprocessor safety during final power collapse.
ADM709LARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-REEL FAQ
1.How can I place an order for ADM709LARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM709LARZ-REEL 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-REEL reliable?
The price and inventory of ADM709LARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM709LARZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM709LARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM709LARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM709LARZ-REEL?
ADM709LARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM709LARZ-REEL 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-REEL?
For technical support, including ADM709LARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM709LARZ-REEL requirements.
6.How does Aetrix verify that ADM709LARZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM709LARZ-REEL 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-REEL meets industry standards.
7.What is the process for return or replacement of ADM709LARZ-REEL?
All ADM709LARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM709LARZ-REEL, 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-REEL part is unused and in its original packaging.
Return procedure for ADM709LARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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