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Analog Devices Inc. ADM709TAN
- Part No.:
- ADM709TAN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM709TAN.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
ADM709TAN from Analog Devices is a precision power supply monitor IC with active-low reset output, 3.08 V threshold, 140 ms minimum power-on reset pulse, and operation down to 1 V supply voltage - used in +3 V microprocessor systems for reliable brownout and power-up reset control.
For engineers reviewing the ADM709TAN datasheet, ADM709TAN pinout, ADM709TAN application, or ADM709TAN equivalent, key selection considerations include reset threshold accuracy (±0.08 V), guaranteed RESET functionality at VCC ≥ 1 V, 35 µA typical quiescent current, and compatibility with bidirectional µP reset lines via external series resistor.
Technical Context
The ADM709TAN integrates a precision voltage comparator and internal 140 ms timeout timer to generate a clean, glitch-immune active-low RESET signal during power-up, brownout, and power-down events. Its reset generator remains functional with VCC as low as 1 V, ensuring controlled shutdown sequencing.
It features no-connect pins (1, 4, 5, 6, 8), single power input (Pin 2), ground (Pin 3), and open-drain RESET output (Pin 7) - designed for direct interface to µP reset inputs with optional pull-down or series resistor per application requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±0.08 V - precisely monitors +3 V supply rails without external components. |
| VCC Operating Range | 1.0 V to 5.5 V - enables reset assertion even during deep brownout or low-voltage shutdown. |
| Power-On Reset Pulse | 140 ms minimum - ensures sufficient stabilization time for +3 V microprocessors after power-up. |
| Quiescent Current | 35 µA typical - minimizes standby power impact in battery-backed or low-power embedded systems. |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and flexible pull-up voltage selection. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
ADM709TAN is housed in an 8-pin plastic DIP (N-8) package with 0.3 inch width, through-hole mounting, and standard DIP lead spacing. Pin 1 is top-left corner (notch side), with Pin 2 (VCC), Pin 3 (GND), and Pin 7 (RESET) being the only functional terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 2) | Supply Input | Accepts 1.0–5.5 V; powers internal comparator and timer; must be decoupled with ≥0.1 µF capacitor. |
| GND (Pin 3) | Reference Ground | System ground reference for threshold detection and RESET output logic level. |
| RESET (Pin 7) | Active-Low Open-Drain Output | Drives low during fault conditions; requires external pull-up; supports bidirectional µP interfaces with 4.7 kΩ series resistor. |
| 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 3.08 V threshold | Enables accurate monitoring of +3 V supplies without trimming or calibration components. |
| 140 ms min power-on reset pulse | Guarantees µP initialization completes before release, eliminating race conditions during boot. |
| Operation down to 1 V VCC | Ensures deterministic reset hold during power collapse - critical for data retention and safe shutdown. |
| Glitch-immune VCC sensing | Rejects short transients on supply rail, preventing spurious resets in noisy industrial environments. |
| Upgrade path from MAX709 | Direct functional replacement with identical timing, threshold options, and pinout for legacy designs. |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Power cycling and voltage sag during engine cranking or load dump events. IC Role / Device Role / Timing Role: Monitors 3.3 V domain and asserts active-low RESET until stable, then holds for ≥140 ms. Use Value: Prevents firmware corruption by blocking µP execution until regulated supply settles post-cranking. | Use Scenario: Intermittent 3 V supply dips due to alternator ripple or relay switching noise. IC Role / Device Role / Timing Role: Detects sub-threshold VCC excursions and generates glitch-immune reset pulses. Use Value: Eliminates unintended reboots in infotainment and gateway ECUs operating from switched 3.3 V rails. |
| Medical Diagnostic Handhelds | Smart Energy Meters |
Use Scenario: Battery voltage decay below 3.3 V during extended field use with intermittent charging. IC Role / Device Role / Timing Role: Triggers controlled shutdown when VCC drops below 3.08 V and maintains RESET until power fully collapses. Use Value: Preserves SRAM contents and enables graceful state save before brownout-induced lockup. | Use Scenario: Utility meter main supply interruption followed by backup capacitor discharge. IC Role / Device Role / Timing Role: Generates long-duration RESET during capacitor decay, holding µP in reset until VCC < 1 V. Use Value: Ensures metrology ASIC completes final energy accumulation before power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX709TSA+ | 3.08 V threshold, 200 ms reset timeout, SO-8 only, higher quiescent current (50 µA typ). | SO-8 footprint only; lacks N-8 DIP option; not suitable for through-hole legacy PCBs. | Select if SO-8 surface-mount assembly is required and longer reset pulse is acceptable. |
| TPS3808G30DBVR | 3.0 V threshold (±1.5%), 200 ms fixed delay, 1.8–6 V VCC range, SOT-23-5 package. | Smaller footprint, lower supply current (1.1 µA), but no 1 V operation guarantee and different pinout. | Select for ultra-low-power portable designs where board space is constrained and 1 V operation is not required. |
Compared with MAX709TSA+ and TPS3808G30DBVR, the ADM709TAN uniquely supports 1 V operation, offers through-hole N-8 packaging, and delivers tighter threshold tolerance (±0.08 V) - making it optimal for industrial retrofits and brownout-critical systems requiring deterministic low-voltage reset behavior.
Availability
ADM709TAN is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical handheld diagnostics, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ADM709TAN 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 Norwood, MA.
The ADM709 family was designed specifically for robust, low-cost power supply monitoring in microprocessor-based systems - emphasizing precision threshold detection, wide VCC operability, and immunity to supply-line transients.
FAQ
What is the exact reset threshold voltage of the ADM709TAN?
The ADM709TAN has a nominal reset threshold of 3.08 V, with a guaranteed range of 3.00 V to 3.15 V over the full –40°C to +85°C temperature range. This value is factory-trimmed and specified in the Absolute Maximum Ratings table of the official Analog Devices datasheet Rev. 0. The ADM709TAN uses this precise threshold to detect brownout conditions on +3 V supply rails without external resistive dividers.
Does the ADM709TAN support operation below 1 V VCC?
No - the ADM709TAN RESET output is guaranteed functional only down to 1 V VCC. Below that, the internal circuitry cannot maintain valid logic states. If sustained reset assertion below 1 V is required, a 100 kΩ pull-down resistor between RESET and GND is recommended, as documented in Figure 5 of the ADM709 datasheet. The ADM709TAN itself does not drive RESET actively below 1 V.
Can the ADM709TAN be used with microcontrollers having bidirectional reset pins?
Yes - the ADM709TAN's open-drain RESET output is compatible with bidirectional µP reset lines such as those found on MC68HC11 derivatives. A 4.7 kΩ series resistor between ADM709TAN Pin 7 and the µP reset pin prevents signal contention, as shown in Figure 6 of the datasheet. This configuration ensures safe interfacing without latch-up or bus conflicts during reset assertion or release.
What is the minimum power-on reset pulse width for the ADM709TAN?
The ADM709TAN guarantees a minimum power-on reset pulse width of 140 ms after VCC rises above the 3.08 V threshold. Typical duration is 280 ms, and maximum is 380 ms, all measured under full operating conditions (–40°C to +85°C). This timing ensures reliable µP initialization and eliminates race conditions during boot - a core design requirement explicitly stated in the ADM709TAN's General Description section.
Is the ADM709TAN pin-compatible with other ADM709 variants?
Yes - all ADM709 variants including ADM709TAN share identical 8-pin N-8 DIP pinouts and terminal functions: Pin 2 = VCC, Pin 3 = GND, Pin 7 = RESET, and Pins 1/4/5/6/8 = NC. Threshold voltage (3.08 V for ADM709TAN) is the sole functional difference among variants; no PCB layout change is needed when substituting within the same package type.
ADM709TAN 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:
- 3.08V
- 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
ADM709TAN FAQ
1.How can I place an order for ADM709TAN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM709TAN 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 ADM709TAN reliable?
The price and inventory of ADM709TAN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM709TAN is usually 5 days.
3.What payment methods are accepted for ADM709TAN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM709TAN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM709TAN?
ADM709TAN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM709TAN 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 ADM709TAN?
For technical support, including ADM709TAN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM709TAN requirements.
6.How does Aetrix verify that ADM709TAN is sourced from the original manufacturer or authorized distributors?
All ADM709TAN 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 ADM709TAN meets industry standards.
7.What is the process for return or replacement of ADM709TAN?
All ADM709TAN units undergo pre-shipment inspection (PSI). If there is an issue with ADM709TAN, 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 ADM709TAN part is unused and in its original packaging.
Return procedure for ADM709TAN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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