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Analog Devices Inc. ADM708SAR-REEL
- Part No.:
- ADM708SAR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708SAR-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,545
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Product details
Overview
ADM708SAR-REEL from Analog Devices is a 3 V microprocessor supervisory circuit with dual active-high/active-low reset outputs, 2.93 V precision voltage monitoring threshold, 200 ms reset pulse width, and power-fail warning capability via PFI/PFO. It ensures reliable reset assertion during power-up, brownout, and low-VCC conditions down to 1 V in embedded controllers and battery-powered instrumentation.
For engineers reviewing the ADM708SAR-REEL datasheet, ADM708SAR-REEL pinout, ADM708SAR-REEL application, or ADM708SAR-REEL equivalent, key selection criteria include its dual-reset output architecture, absence of watchdog timer (distinguishing it from ADM706S), guaranteed RESET validity at VCC = 1 V, and compatibility with 3 V/3.3 V supply rails in space-constrained SOIC_N layouts.
Technical Context
The ADM708SAR-REEL implements a precision bandgap-based voltage reference (2.93 V ±70 mV) for supply monitoring and a dedicated 1.25 V comparator for power-fail detection on the PFI input. Its dual-reset output stage delivers both active-low (RESET) and active-high (RESET) signals simultaneously without external buffering.
No watchdog timer circuitry is integrated-unlike the ADM706S family-making it suitable for systems where independent processor activity monitoring is handled externally or unnecessary. The MR input features internal 70 µA pull-up and debouncing, and RESET remains valid with VCC as low as 1 V due to optimized internal transistor drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±70 mV - precisely monitors 3 V supplies; triggers reset before microprocessor operational failure. |
| Reset Pulse Width | 200 ms typical - provides sufficient time for power stabilization and microprocessor initialization after power-up or brownout recovery. |
| Supply Current | 100 µA typical at VCC < 3.6 V - enables long battery life in portable instruments and low-power embedded systems. |
| VCC Operating Range | 3.00 V to 5.5 V - supports direct interface with 3 V, 3.3 V, and 5 V logic domains without level-shifting. |
| Power-Fail Threshold | 1.25 V on PFI - allows configurable early-warning detection of supply droop using external resistor divider networks. |
| RESET Validity | Guaranteed down to VCC = 1 V - ensures microprocessor remains held in reset during deep undervoltage conditions until safe restart. |
| Output Drive | VOH ≥ 0.8×VCC / VOL ≤ 0.3 V at ISINK = 500 µA - compatible with TTL/CMOS inputs across full operating range. |
Pinout & Package
ADM708SAR-REEL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 mm × 4.00 mm body, and 1.75 mm max height-optimized for automated assembly and PCB space efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Debounced TTL/CMOS-compatible input; internally pulled up with 70 µA; asserts reset when driven below 0.6 V. |
| 2 (VCC) | Power Supply Input | Primary supply rail connection; requires 0.1 µF decoupling capacitor to GND for noise immunity. |
| 3 (GND) | Ground Reference | Common 0 V return for all internal circuits and I/O; must be low-impedance connection. |
| 4 (PFI) | Power-Fail Input | Noninverting input to 1.25 V comparator; used with external resistor divider to monitor secondary supply or preregulator voltage. |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output signaling PFI < 1.25 V; can interrupt microprocessor or trigger shutdown sequence. |
| 6 (NC) | No Connect | Unbonded pin; must remain unconnected per datasheet; no internal circuitry attached. |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserted low for 200 ms during power-up/brownout/MR event; remains low while VCC < 2.93 V. |
| 8 (RESET) | Active-High Reset Output | Inverted complement of pin 7; provides simultaneous active-high reset signal for bidirectional or legacy microprocessor interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset polarity outputs | Simultaneous RESET (active-low) and RESET (active-high) eliminate need for external inverters in mixed-logic systems. |
| Guaranteed reset at 1 V VCC | Ensures fail-safe microprocessor hold-down during deep brownouts-critical for data integrity in battery-backed memory systems. |
| Configurable power-fail warning | PFI/PFO pair enables user-defined early-warning thresholds (e.g., 4.5 V on 5 V rail) via resistor divider, supporting orderly shutdown before catastrophic failure. |
| Internal MR debouncing | 200 ms debounce time eliminates mechanical switch bounce without external RC network-reducing BOM count and layout area. |
| SOIC_N package compatibility | R-8 footprint matches industry-standard 8-lead SOIC layouts, enabling drop-in replacement in existing designs without PCB revision. |
Applications
| Industrial Controller Monitoring | Portable Medical Instrumentation |
|---|---|
Use Scenario: Supervising 3.3 V supply and watchdog-free MCU in PLC I/O modules subject to 12–24 V field bus transients. IC Role / Device Role / Timing Role: Voltage monitor and dual-polarity reset generator ensuring deterministic MCU boot and brownout recovery. Use Value: Eliminates external level shifters and inverters while guaranteeing reset assertion down to 1 V-preventing spurious reboots during line sags. | Use Scenario: Power sequencing and low-battery alert in handheld ECG devices powered by single Li-ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary supervisor providing reset coordination and PFI-based battery voltage monitoring. Use Value: 100 µA quiescent current extends battery runtime; 1.25 V PFI threshold enables accurate end-of-life detection via resistive scaling. |
| Smart Energy Metering | Automated Test Equipment (ATE) |
Use Scenario: Ensuring reliable startup and supply integrity in DIN-rail mounted electricity meters with isolated 3.3 V auxiliary rails. IC Role / Device Role / Timing Role: Dual-output reset generator interfacing with isolation barrier and MCU reset pins requiring complementary logic levels. Use Value: Simultaneous RESET/RESET outputs simplify interface to optocoupler-isolated reset paths-no timing skew or added propagation delay. | Use Scenario: Board-level power supervision in modular ATE mainframes where multiple 3 V/3.3 V FPGA and ADC subsystems require synchronized reset. IC Role / Device Role / Timing Role: Centralized voltage monitor and reset coordinator with manual reset override for service mode entry. Use Value: MR input debouncing and 200 ms fixed pulse width ensure clean, glitch-free reset distribution across high-speed digital subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM706SAR-REEL | Includes watchdog timer (1.6 sec timeout) and WDI/WDO pins; single active-low RESET output only. | Required where processor activity monitoring is needed; unsuitable if dual-reset polarity or PFO-driven shutdown is mandatory. | Select ADM706SAR-REEL only when watchdog functionality is essential and active-high reset is not required. |
| MAX708SUR-T | Maxim Integrated part with identical 2.93 V threshold, dual RESET/RESET, and PFI/PFO-but higher 25 µA max quiescent current and no 1 V VCC guarantee. | Acceptable for non-critical industrial use where ultra-low power and sub-1 V reset validity are not design requirements. | Choose MAX708SUR-T only if legacy Maxim sourcing or qualification is mandated; verify PFO timing and 1 V operation separately. |
Compared with ADM706SAR-REEL, ADM708SAR-REEL trades watchdog capability for dual-reset flexibility and lower quiescent current; versus MAX708SUR-T, it offers superior low-VCC robustness and tighter supply current spec-making it optimal for battery-sensitive, safety-critical 3 V systems.
Availability
ADM708SAR-REEL is available at Aetrix Electronics and suitable for industrial controller monitoring, portable medical instrumentation, smart energy metering, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for ADM708SAR-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for reliable power-on reset, brownout protection, and supply integrity monitoring in 3 V/3.3 V embedded systems with stringent reliability and low-power demands.
FAQ
What is the reset threshold voltage of the ADM708SAR-REEL?
The ADM708SAR-REEL has a nominal reset threshold voltage of 2.93 V, with a tolerance of ±70 mV (2.85 V to 3.00 V). This value is factory-trimmed and specified over the full industrial temperature range (−40°C to +85°C), making it suitable for precise monitoring of 3 V supply rails. The threshold is referenced to an internal bandgap and does not require external components.
Does the ADM708SAR-REEL include a watchdog timer function?
No, the ADM708SAR-REEL does not include a watchdog timer. Unlike the ADM706S family, it omits the WDI (watchdog input) and WDO (watchdog output) pins-pin 6 is designated NC (no connect). Its functional block diagram confirms absence of watchdog circuitry, focusing instead on dual-reset generation and power-fail warning via PFI/PFO.
What is the purpose of the PFI and PFO pins on the ADM708SAR-REEL?
The PFI (Power-Fail Input) pin connects to a 1.25 V comparator's noninverting input, allowing external resistor dividers to monitor secondary supplies or preregulator voltages. When PFI falls below 1.25 V, the PFO (Power-Fail Output) pin drives low-an open-drain signal usable for interrupting the microprocessor or initiating controlled shutdown. This enables early-warning detection before main supply collapse.
Can the ADM708SAR-REEL operate with VCC below 3 V?
Yes-the ADM708SAR-REEL guarantees valid RESET assertion down to VCC = 1 V, though its specified operating range begins at 3.00 V. Below 3 V, reset functionality remains active but supply current and output drive degrade. For reliable operation, VCC must be ≥3.00 V; however, the 1 V guarantee ensures fail-safe hold-down during undervoltage transients within that range.
What package type is used for the ADM708SAR-REEL?
The ADM708SAR-REEL uses an 8-lead SOIC_N (Small Outline Integrated Circuit, narrow body) package, also designated R-8 per JEDEC MS-012-AA. It measures 5.00 mm × 4.00 mm with 1.27 mm lead pitch and is supplied on tape-and-reel (REEL suffix), qualified for surface-mount assembly and industrial temperature operation (−40°C to +85°C).
ADM708SAR-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM708SAR-REEL FAQ
1.How can I place an order for ADM708SAR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708SAR-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 ADM708SAR-REEL reliable?
The price and inventory of ADM708SAR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708SAR-REEL is usually 5 days.
3.What payment methods are accepted for ADM708SAR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708SAR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708SAR-REEL?
ADM708SAR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708SAR-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 ADM708SAR-REEL?
For technical support, including ADM708SAR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708SAR-REEL requirements.
6.How does Aetrix verify that ADM708SAR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM708SAR-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 ADM708SAR-REEL meets industry standards.
7.What is the process for return or replacement of ADM708SAR-REEL?
All ADM708SAR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM708SAR-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 ADM708SAR-REEL part is unused and in its original packaging.
Return procedure for ADM708SAR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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