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Analog Devices Inc. ADM709RAN
- Part No.:
- ADM709RAN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM709RAN.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,130
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Product details
Overview
ADM709RAN from Analog Devices is a precision power supply monitor IC with active-low reset output, 2.63 V reset 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 during power-up, brownout, and power-down in industrial embedded systems.
For engineers reviewing the ADM709RAN datasheet, ADM709RAN pinout, ADM709RAN application, or ADM709RAN equivalent, key selection considerations include its fixed 2.63 V threshold, N-8 DIP package, 35 µA quiescent current, and guaranteed RESET functionality at VCC ≥ 1 V - critical for low-voltage 3 V and battery-backed systems.
Technical Context
The ADM709RAN 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 V, enabling reliable shutdown sequencing in collapsing supply rails.
It features glitch immunity against short VCC transients and supports bidirectional µP reset lines via external series resistor (e.g., 4.7 kΩ). No external components are required for basic operation, though a 0.1 µF bypass capacitor on VCC is recommended for enhanced noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±0.08 V - precisely monitors 2.7–3.0 V supplies; enables robust reset assertion before 3 V µP brownout. |
| Power-On Reset Pulse | 140 ms (min) - ensures sufficient stabilization time for 3 V microcontrollers and peripherals after power-up. |
| VCC Operating Range | 1.0 V to 5.5 V - allows full reset functionality even during deep brownout or battery discharge down to 1 V. |
| Quiescent Current | 35 µA (typ) at VCC < 3.6 V - minimizes standby power in always-on monitoring applications. |
| RESET Output Drive | 0.3 V max at 1.2 mA sink - compatible with TTL/CMOS inputs; supports direct connection to most µP reset pins. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating. |
| Package | N-8 (8-pin plastic DIP) - through-hole mounting; 0.3" width; compatible with legacy PCB layouts and manual assembly. |
Pinout & Package
ADM709RAN is housed in an 8-pin plastic DIP (N-8) package with 0.3" width and standard DIP footprint. Pins 1, 4, 5, 6, and 8 are no-connect; only VCC (Pin 2), GND (Pin 3), and RESET (Pin 7) are functional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 2) | Supply Input | Accepts 1.0–5.5 V; powers internal comparator and timer; must be bypassed with 0.1 µF capacitor. |
| GND (Pin 3) | Reference Ground | 0 V return path for internal circuitry and RESET output; requires low-impedance connection to system ground plane. |
| RESET (Pin 7) | Active-Low Reset Output | Open-drain compatible; sinks up to 1.2 mA; asserts low during brownout and for ≥140 ms after VCC recovery. |
| NC (Pins 1,4,5,6,8) | No Connect | Internally unconnected; may be left floating or tied to GND for mechanical stability; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63 V Threshold | Enables accurate supervision of 2.8–3.0 V logic supplies without external resistive divider or calibration. |
| 140 ms Minimum Reset Pulse | Guarantees µP core and peripheral initialization completes before release, eliminating boot failures in 3 V systems. |
| Operation Down to 1 V | Ensures deterministic reset hold during supply collapse - critical for nonvolatile memory write completion and safe shutdown. |
| Glitch Immunity | Rejects sub-20 µs VCC transients, preventing spurious resets in electrically noisy industrial or automotive power environments. |
| Upgrade for MAX709 | Direct functional replacement for MAX709R with identical pinout, threshold, and timing - simplifies legacy design refresh. |
Applications
| Industrial PLC Controllers | 3 V Battery-Backed Data Loggers |
|---|---|
Use Scenario: Supervising ARM Cortex-M0+ or PIC18F microcontrollers in programmable logic controllers exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Power-on reset generator and brownout detector; asserts RESET until VCC stabilizes above 2.63 V and holds for ≥140 ms. Use Value: Prevents erratic firmware execution during unstable 3.3 V rail startup and ensures deterministic recovery after line sags. | Use Scenario: Monitoring lithium-thionyl chloride (LiSOCl₂) battery-powered environmental sensors operating at 2.8–3.2 V nominal. IC Role / Device Role / Timing Role: Low-voltage supervisor with 1 V operational floor; maintains RESET assertion during end-of-life battery discharge below 2.5 V. Use Value: Guarantees clean shutdown and EEPROM write protection when supply drops below 2.63 V - avoiding data corruption. |
| Automotive Body Control Modules | Medical Portable Diagnostic Devices |
Use Scenario: Reset management for 3 V microcontrollers in under-hood body control units subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Brownout detector with glitch immunity; ignores <20 µs VCC dips caused by relay switching or alternator ripple. Use Value: Eliminates false resets during engine cranking while ensuring valid reset during sustained undervoltage events. | Use Scenario: Ensuring reliable boot of low-power MSP430-based diagnostic instruments powered by dual AA alkaline cells (2.0–3.2 V range). IC Role / Device Role / Timing Role: Precision 2.63 V threshold supervisor; provides 140 ms reset window after cell voltage recovers from transient load sag. Use Value: Enables consistent firmware initialization across battery life - from fresh 3.2 V to aged 2.4 V operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX709RCPA+ | Same 2.63 V threshold, 140 ms reset pulse, and SO-8/N-8 packaging; slightly higher 50 µA typical supply current. | Identical functional behavior; pin-compatible with ADM709RAN in N-8 package but not drop-in due to minor timing variance (280 ms typ vs. 140 ms min). | Select for second-source assurance where MAXIM branding or existing MAX709-based BOMs are preferred. |
| TPS3808G12DBVR | Adjustable threshold (via external resistor); 2% accuracy; 200 ms fixed delay; 1.8–6 V operation; SOT-23-6 package. | Requires external resistor network for 2.63 V setting; smaller footprint but no DIP option; lacks 1 V operational floor. | Select when board space is constrained and adjustable threshold or tighter accuracy is needed - not for direct DIP replacement. |
Compared with MAX709RCPA+ and TPS3808G12DBVR, the ADM709RAN offers guaranteed 1 V operation and fixed 2.63 V threshold in a legacy-compatible N-8 DIP, making it optimal for industrial retrofits and battery systems requiring deep brownout hold.
Availability
ADM709RAN is available at Aetrix Electronics and suitable for industrial PLC controllers, 3 V battery-backed data loggers, automotive body control modules, and medical portable diagnostic devices requiring stable component supply and long-term obsolescence support.
Supply support for ADM709RAN 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM709 belongs to Analog Devices' supervisory IC product line, designed specifically for reliable power-on reset, brownout detection, and supply voltage monitoring in industrial, automotive, and embedded computing systems.
FAQ
What is the exact reset threshold voltage of the ADM709RAN?
The ADM709RAN has a nominal reset threshold of 2.63 V, with a guaranteed range of 2.55 V to 2.70 V over the full –40°C to +85°C temperature range. This value is laser-trimmed at wafer test and does not require external components to achieve precision - making it ideal for 3 V system supervision without resistor dividers.
Can the ADM709RAN operate when VCC drops below 2.0 V?
Yes, the ADM709RAN continues to assert a valid RESET signal down to VCC = 1.0 V. Its internal circuitry remains functional at this level, ensuring the microprocessor stays held in reset during deep brownout or battery depletion - a key differentiator versus many competitors that cease operation above 2.0 V.
Is the ADM709RAN pin-compatible with the MAX709R?
Yes, the ADM709RAN is functionally and pin-compatible with the MAX709R in the same N-8 DIP package. Both share identical pinout (VCC=2, GND=3, RESET=7), 2.63 V threshold, and 140 ms minimum reset pulse. This enables direct substitution in legacy designs originally using MAX709R without PCB changes.
What is the maximum load the RESET output of ADM709RAN can drive?
The RESET output of ADM709RAN can sink up to 1.2 mA while maintaining ≤0.3 V output voltage (at VCC ≥ reset threshold min), supporting direct interface to standard CMOS and TTL reset inputs. For higher-current loads or bidirectional µP interfaces, a 4.7 kΩ series resistor is recommended per Analog Devices' application guidance.
Does the ADM709RAN require an external capacitor for basic operation?
No external capacitor is required for basic reset generation. However, a 0.1 µF ceramic capacitor placed close to the VCC pin is strongly recommended to improve glitch immunity and suppress high-frequency noise on the supply rail - especially in electrically noisy industrial or automotive environments where the ADM709RAN is commonly deployed.
ADM709RAN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADM709RAN FAQ
1.How can I place an order for ADM709RAN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM709RAN 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 ADM709RAN reliable?
The price and inventory of ADM709RAN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM709RAN is usually 5 days.
3.What payment methods are accepted for ADM709RAN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM709RAN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM709RAN?
ADM709RAN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM709RAN 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 ADM709RAN?
For technical support, including ADM709RAN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM709RAN requirements.
6.How does Aetrix verify that ADM709RAN is sourced from the original manufacturer or authorized distributors?
All ADM709RAN 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 ADM709RAN meets industry standards.
7.What is the process for return or replacement of ADM709RAN?
All ADM709RAN units undergo pre-shipment inspection (PSI). If there is an issue with ADM709RAN, 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 ADM709RAN part is unused and in its original packaging.
Return procedure for ADM709RAN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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