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Analog Devices Inc. ADM708TAN
- Part No.:
- ADM708TAN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM708TAN.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,799
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Product details
Overview
ADM708TAN from Analog Devices is a 3.08 V precision microprocessor supervisory circuit in an 8-lead PDIP package, providing dual active-high and active-low reset outputs, 200 ms reset pulse width, 100 µA quiescent current, and 1.25 V power-fail comparator for low-battery warning in battery-operated embedded systems.
For engineers reviewing the ADM708TAN datasheet, ADM708TAN pinout, ADM708TAN application, or ADM708TAN equivalent, key selection criteria include its dual-reset output capability, guaranteed RESET validity down to VCC = 1 V, absence of watchdog timer (distinguishing it from ADM706x series), and compatibility with 3 V/3.3 V supply monitoring in space-constrained industrial controllers.
Technical Context
The ADM708TAN implements a precision voltage monitor with fixed 3.08 V reset threshold and 20 mV hysteresis, enabling reliable brownout detection for 3 V systems. Its dual-reset architecture delivers both RESET (active low) and RESET (active high) simultaneously without external inversion logic.
It integrates a dedicated 1.25 V reference-based power-fail comparator (PFI/PFO) for early-warning monitoring of auxiliary supplies or battery voltage decay, with PFO asserting low when PFI falls below 1.25 V - independent of VCC regulation status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±0.08 V - precisely targets 3 V supply monitoring with margin against nominal 3.0 V rail sag during load transients. |
| Reset Pulse Width | 200 ms - ensures sufficient hold time for microprocessor power-up stabilization and internal state initialization. |
| Quiescent Current | 100 µA at VCC < 3.6 V - enables long-term operation in battery-powered instruments without significant drain. |
| Valid RESET Down to | VCC = 1 V - guarantees deterministic processor hold-down during deep brownout or battery depletion. |
| Power-Fail Threshold | 1.25 V - provides stable reference for resistive-divider-based battery voltage monitoring or secondary supply supervision. |
| Output Drive Strength | VOH ≥ 0.8×VCC / VOL ≤ 0.3 V @ 500 µA sink - supports direct interfacing with TTL/CMOS inputs without level-shifting. |
Pinout & Package
ADM708TAN is housed in an 8-lead narrow-body plastic dual in-line package (PDIP, N-8), compliant with JEDEC MS-001, with 0.300-inch body width and 0.100-inch lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Debounced TTL/CMOS-compatible input; internally pulled up with 70 µA; triggers both RESET outputs when driven below 0.6 V. |
| 2 VCC | Power Supply Input | Primary supply connection for 3.15–5.5 V operation; requires local 0.1 µF decoupling to GND. |
| 3 GND | Ground Reference | Common return path for all analog and digital functions; must be low-impedance connection to system ground plane. |
| 4 PFI | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply via resistor divider; must be tied to GND if unused. |
| 5 PFO | Power-Fail Output | Active-low open-drain output signaling PFI < 1.25 V; drives interrupt or shutdown logic without external pull-up required. |
| 6 NC | No Connect | Internally unconnected pin; must remain floating - no routing or soldering permitted. |
| 7 RESET | Active-Low Reset Output | Push-pull output asserted low for 200 ms on power-up, brownout, or MR assertion; valid down to VCC = 1 V. |
| 8 RESET | Active-High Reset Output | Inverted complement of pin 7; enables direct interface with processors requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Dual active-high/low reset outputs | Eliminates need for external inverters in systems with mixed reset polarity requirements or bidirectional reset lines. |
| Guaranteed RESET operation at VCC = 1 V | Ensures fail-safe microprocessor hold-down during severe brownout or battery exhaustion, preventing undefined execution states. |
| 1.25 V precision power-fail comparator | Enables accurate low-battery warning or auxiliary supply monitoring using simple resistor dividers, independent of main VCC regulation. |
| 20 mV reset threshold hysteresis | Prevents oscillatory reset assertion during slow-rising/falling supply edges or noise-induced threshold crossings. |
| Internal 70 µA MR pull-up | Permits direct connection of momentary switches to MR without external biasing components, reducing BOM count and board area. |
Applications
| Industrial Controller Monitoring | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Supervising 3 V microcontroller power rails in programmable logic controllers where brownout resilience is critical for process continuity. IC Role / Device Role / Timing Role: Voltage monitor and reset generator ensuring deterministic MCU reset during AC line sags or backup battery transitions. Use Value: Dual-reset outputs interface natively with both legacy and modern MCUs; 200 ms pulse width satisfies ARM Cortex-M and PIC timing requirements. | Use Scenario: Providing power-on reset and low-battery warning in handheld multimeters and portable data loggers. IC Role / Device Role / Timing Role: Primary supervisory IC managing VCC sequencing and battery voltage decay detection via PFI divider network. Use Value: 100 µA quiescent current extends shelf life; 1.25 V PFI threshold enables accurate end-of-life battery detection at ~2.8 V (with 2.2:1 divider). |
| Embedded System Power Fail Response | 3.3 V FPGA Configuration Integrity |
Use Scenario: Initiating graceful shutdown in edge gateway devices upon detection of primary DC supply collapse. IC Role / Device Role / Timing Role: Power-fail comparator (PFI/PFO) triggers NMI interrupt before VCC dropout, allowing firmware to save state and disable peripherals. Use Value: PFO asserts within 500 ns of PFI crossing 1.25 V (typ.), enabling sub-millisecond response to supply faults. | Use Scenario: Ensuring reliable FPGA configuration startup by holding reset until 3.3 V rail stabilizes above 3.08 V. IC Role / Device Role / Timing Role: Precision reset supervisor validating post-regulator voltage integrity prior to releasing FPGA PROG_B or INIT_B. Use Value: 3.08 V threshold matches typical 3.3 V LDO tolerance (±3%), eliminating false resets during nominal rail ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM708SANZ | 2.93 V reset threshold; identical pinout, dual-reset, no watchdog | Suitable for 3.3 V systems with tighter supply tolerance; lower trip point increases noise margin but reduces brownout headroom | Select when monitoring 3.3 V rails where 2.93 V threshold better accommodates LDO dropout and PCB trace loss. |
| MAX708TESA+ | Pin-compatible Maxim replacement; 3.08 V threshold, dual reset, same PDIP-8 package | Same functional behavior but different internal ESD structure and thermal characteristics; validated for drop-in use in legacy designs | Choose for second-source assurance in production programs where Analog Devices supply continuity is constrained. |
Compared with ADM708TAN, ADM708SANZ offers higher noise immunity at 3.3 V but reduced brownout margin, while MAX708TESA+ provides identical electrical behavior with alternate manufacturing lineage - both require no PCB changes but differ in long-term reliability profiles under thermal cycling.
Availability
ADM708TAN is available at Aetrix Electronics and suitable for industrial controller monitoring, battery-powered instrumentation, embedded system power fail response, and 3.3 V FPGA configuration integrity requiring stable component supply across extended product lifecycles.
Supply support for ADM708TAN 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for deterministic reset generation, power-fail warning, and supply voltage integrity verification in resource-constrained embedded systems.
FAQ
What is the reset threshold voltage of the ADM708TAN and how is it used in system design?
The ADM708TAN has a precise 3.08 V reset threshold with ±0.08 V tolerance, optimized for monitoring 3 V supply rails. This value ensures reliable detection of brownout conditions while maintaining margin above typical 3 V LDO dropout voltages. In system design, it guarantees that the microprocessor remains held in reset until the supply stabilizes above 3.08 V, preventing erratic operation during power-up or transient sags. The ADM708TAN's 20 mV hysteresis further prevents chatter near the threshold.
Does the ADM708TAN include a watchdog timer function?
No, the ADM708TAN does not include a watchdog timer. Unlike the ADM706x family, the ADM708TAN omits the WDI and WDO pins entirely - pin 6 is designated NC (no connect). Its functionality is focused exclusively on voltage monitoring, dual-reset generation, and power-fail detection via PFI/PFO. If watchdog supervision is required, the ADM706TAN (same threshold, same package) must be selected instead.
How does the ADM708TAN support bidirectional reset lines in microprocessors?
The ADM708TAN supports bidirectional reset lines through its dual complementary outputs: pin 7 (RESET, active low) and pin 8 (RESET, active high). When interfacing with processors like certain ARM or Renesas MCUs that drive reset bidirectionally, a 4.7 kΩ current-limiting resistor is placed between the ADM708TAN's RESET output and the MCU pin. This prevents contention while preserving reset assertion integrity - the ADM708TAN's push-pull drivers ensure clean transitions without external buffering.
What is the purpose of the PFI and PFO pins on the ADM708TAN?
The PFI (Power-Fail Input) and PFO (Power-Fail Output) pins implement an independent 1.25 V comparator for monitoring auxiliary supplies or battery voltage. PFI accepts a divided-down voltage from a secondary rail; when that voltage drops below 1.25 V, PFO asserts low within 500 ns (typ.) to trigger an interrupt or initiate controlled shutdown. In battery systems, this enables early low-battery warning - for example, with a 2.2:1 resistor divider, PFO activates at ~2.75 V battery voltage, well before critical cutoff.
Can the ADM708TAN operate reliably at very low supply voltages?
Yes, the ADM708TAN guarantees valid RESET output down to VCC = 1 V, verified across the full −40°C to +85°C industrial temperature range. This ensures the microprocessor remains held in a known reset state even during deep brownout or battery depletion. Below 1 V, internal transistor drive weakens; for applications requiring forced low-state below 1 V, a 10 kΩ external pull-down resistor on the RESET pin (pin 7) is recommended per Analog Devices' Figure 19.
ADM708TAN 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, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 160ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADM708TAN FAQ
1.How can I place an order for ADM708TAN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708TAN 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 ADM708TAN reliable?
The price and inventory of ADM708TAN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708TAN is usually 5 days.
3.What payment methods are accepted for ADM708TAN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708TAN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708TAN?
ADM708TAN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708TAN 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 ADM708TAN?
For technical support, including ADM708TAN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708TAN requirements.
6.How does Aetrix verify that ADM708TAN is sourced from the original manufacturer or authorized distributors?
All ADM708TAN 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 ADM708TAN meets industry standards.
7.What is the process for return or replacement of ADM708TAN?
All ADM708TAN units undergo pre-shipment inspection (PSI). If there is an issue with ADM708TAN, 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 ADM708TAN part is unused and in its original packaging.
Return procedure for ADM708TAN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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