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Analog Devices Inc. ADM708RAR-REEL
- Part No.:
- ADM708RAR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708RAR-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,386
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Product details
Overview
ADM708RAR-REEL from Analog Devices is a 3 V microprocessor supervisory circuit with dual active-high/active-low reset outputs, 2.63 V reset threshold, 200 ms reset pulse width, and integrated power-fail comparator (1.25 V threshold). It monitors supply integrity in embedded controllers and battery-powered instruments where reliable power-on reset and brownout detection are critical.
For engineers reviewing the ADM708RAR-REEL datasheet, ADM708RAR-REEL pinout, ADM708RAR-REEL application, or ADM708RAR-REEL equivalent, this page delivers verified functional specifications, validated SOIC-8 package mapping, confirmed dual-reset behavior, and real-world timing and voltage monitoring constraints - all directly traceable to Analog Devices Rev. E datasheet.
Technical Context
The ADM708RAR-REEL implements a precision voltage monitor with fixed 2.63 V reset threshold and guaranteed RESET validity down to VCC = 1 V. Its dual-reset architecture provides both active-low (RESET) and active-high (RESET) outputs simultaneously, eliminating need for external inverters in bidirectional reset systems.
It integrates a dedicated 1.25 V power-fail comparator (PFI/PFO) for early warning of supply collapse and includes a debounced manual reset input (MR) with 70 µA internal pull-up. Unlike the ADM706 family, it omits watchdog timer functionality, simplifying design where software supervision is handled externally.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±70 mV - sets precise brownout detection point for 3 V systems |
| Reset Pulse Width | 200 ms typical - ensures sufficient processor stabilization time after power-up or recovery |
| Supply Current | 100 µA typical at VCC < 3.6 V - enables long battery life in portable instrumentation |
| Power-Fail Threshold | 1.25 V ±50 mV - enables configurable early-warning shutdown via external resistor divider |
| Reset Output Drive | VOH ≥ 0.8×VCC / VOL ≤ 0.3 V at 500 µA sink - compatible with TTL/CMOS logic interfaces |
| Operating Voltage Range | 2.7 V to 5.5 V - supports 3 V and 3.3 V rails with margin for ripple and dropout |
| Temperature Range | −40°C to +85°C - qualified for industrial embedded environments |
Pinout & Package
ADM708RAR-REEL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and gull-wing leads. The package is RoHS-compliant and reel-packaged for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Debounced TTL/CMOS-compatible input; internally pulled up with 70 µA; triggers reset when pulled below 0.6 V |
| 2 VCC | Power Supply Input | Primary supply rail connection; requires 0.1 µF decoupling capacitor to GND |
| 3 GND | Ground Reference | Common return path for all internal circuits and output drivers |
| 4 PFI | Power-Fail Input | Noninverting input to 1.25 V comparator; used with external resistor divider to monitor secondary supplies |
| 5 PFO | Power-Fail Output | Active-low open-drain output signaling supply collapse; sinks ≥1.2 mA at VOL ≤ 0.3 V |
| 6 NC | No Connect | Internally unconnected; must remain floating - no external connection permitted |
| 7 RESET | Active-Low Reset Output | Push-pull output asserted low for 200 ms during power-up, brownout, or MR assertion |
| 8 RESET | Active-High Reset Output | Complementary push-pull output asserted high for same duration - enables direct interface to bidirectional reset pins |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-high and active-low RESET signals eliminate need for external level-shifting or inversion |
| Guaranteed reset operation down to 1 V VCC | Ensures microprocessor remains held in reset during full power-rail collapse, preventing undefined states |
| Integrated 1.25 V power-fail comparator | Enables early warning of supply decay via PFI/PFO pair - supports orderly shutdown before VCC drops below reset threshold |
| Debounced manual reset input | 70 µA internal pull-up and 200 ms timeout prevent contact bounce from causing spurious resets |
| SOIC-8 package with reel packaging | Standard surface-mount footprint compatible with automated PCB assembly; REEL suffix indicates tape-and-reel delivery |
Applications
| Industrial Controller Monitoring | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Supervising 3 V supply in programmable logic controllers with field I/O modules. IC Role / Device Role / Timing Role: Provides power-on reset, brownout detection, and early power-fail warning via PFI/PFO to trigger safe I/O shutdown. Use Value: Prevents corrupted register writes during unstable supply conditions; enables deterministic recovery without firmware intervention. | Use Scenario: Power management in handheld multimeters with lithium coin-cell backup. IC Role / Device Role / Timing Role: Monitors main 3 V rail and generates dual-reset signals to hold MCU in reset until stable; uses PFI to detect battery depletion. Use Value: Extends usable battery life by enabling graceful shutdown before data loss; eliminates need for discrete comparators and reset generators. |
| Embedded Communication Gateway | Medical Diagnostic Sensor Node |
Use Scenario: Ensuring reliable boot sequence in CAN-to-Ethernet gateways operating from 3.3 V SMPS. IC Role / Device Role / Timing Role: Generates synchronized active-high and active-low reset pulses to initialize MCU, PHY, and transceiver ICs simultaneously. Use Value: Eliminates timing skew between subsystems; avoids bus contention during power-up due to bidirectional reset line compatibility. | Use Scenario: Critical reset supervision in portable ECG sensor nodes with ultra-low-power MCU. IC Role / Device Role / Timing Role: Provides fail-safe reset with 200 ms pulse width and valid output down to 1 V VCC to ensure deterministic state retention during battery swap. Use Value: Meets IEC 60601-1 requirements for fault-free initialization; prevents transient-induced memory corruption during low-voltage transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM708SAR-REEL | Higher 2.93 V reset threshold; identical dual-reset, PFI/PFO, and SOIC-8 package | Suitable for 3.3 V systems requiring tighter reset margin above nominal rail | Select when system VCC nominal is 3.3 V and brownout detection must occur closer to rail voltage |
| MAX708SUR+T | Maxim Integrated part with same 2.63 V threshold, dual reset, and SO-8 package; lacks PFI hysteresis support | Drop-in replacement in legacy designs; lower quiescent current (20 µA vs. 100 µA) | Choose for cost-sensitive industrial designs where lower supply current outweighs hysteresis configurability |
Compared with ADM708SAR-REEL, ADM708RAR-REEL offers earlier brownout response for 3 V rails; compared with MAX708SUR+T, it provides superior noise-immune PFI comparator design with explicit hysteresis guidance but draws higher quiescent current.
Availability
ADM708RAR-REEL is available at Aetrix Electronics and suitable for industrial controller monitoring, battery-powered instrumentation, embedded communication gateways, and medical diagnostic sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM708RAR-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 ADM708 series belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for robust power-monitoring in industrial, medical, and portable embedded systems where deterministic reset behavior and supply fault resilience are mandatory.
FAQ
What is the reset threshold voltage of the ADM708RAR-REEL?
The ADM708RAR-REEL has a fixed reset threshold of 2.63 V, with ±70 mV tolerance over temperature and supply. This value is factory-trimmed and applies to both active-low and active-high reset outputs. It is optimized for reliable brownout detection in 3 V systems and remains valid down to VCC = 1 V, ensuring the microprocessor stays held in reset during full supply collapse.
Does the ADM708RAR-REEL include a watchdog timer function?
No, the ADM708RAR-REEL does not include a watchdog timer. Unlike the ADM706P/R/S/T series, the ADM708R/S/T family replaces the WDI/WDO watchdog interface with a second reset output (RESET). Pin 6 is designated NC (No Connect), confirming absence of watchdog functionality. Systems requiring software supervision must implement that externally.
How does the power-fail comparator (PFI/PFO) operate in the ADM708RAR-REEL?
The ADM708RAR-REEL's PFI input connects to a precision 1.25 V internal reference comparator. When voltage at PFI falls below 1.25 V, PFO asserts low. PFI accepts voltages up to VCC + 0.3 V and is intended for use with external resistor dividers to monitor secondary supplies. Hysteresis can be added via feedback from PFO to PFI, as documented in Figure 18 of the datasheet.
Can the ADM708RAR-REEL drive bidirectional reset lines directly?
Yes - the ADM708RAR-REEL's dual RESET and RESET outputs enable direct interface to bidirectional reset pins without external buffering. To prevent contention, Analog Devices recommends inserting a 4.7 kΩ current-limiting resistor between either output and the microprocessor reset pin, as specified in Figure 23 of the datasheet.
What package type and reel specification does ADM708RAR-REEL use?
The ADM708RAR-REEL is supplied in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and gull-wing leads. The "-REEL" suffix confirms tape-and-reel packaging per EIA-481-D standard, optimized for SMT placement. Dimensions are 5.00 mm × 4.00 mm × 1.50 mm (L × W × H).
ADM708RAR-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:
- 2.63V
- 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
ADM708RAR-REEL FAQ
1.How can I place an order for ADM708RAR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708RAR-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 ADM708RAR-REEL reliable?
The price and inventory of ADM708RAR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708RAR-REEL is usually 5 days.
3.What payment methods are accepted for ADM708RAR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708RAR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708RAR-REEL?
ADM708RAR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708RAR-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 ADM708RAR-REEL?
For technical support, including ADM708RAR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708RAR-REEL requirements.
6.How does Aetrix verify that ADM708RAR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM708RAR-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 ADM708RAR-REEL meets industry standards.
7.What is the process for return or replacement of ADM708RAR-REEL?
All ADM708RAR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM708RAR-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 ADM708RAR-REEL part is unused and in its original packaging.
Return procedure for ADM708RAR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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