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Analog Devices Inc. ADM708ARM-REEL
- Part No.:
- ADM708ARM-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADM708ARM-REEL.pdf
- Description:
- IC SUPERVISOR MPU 4.4V WD 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:28,956
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Product details
Overview
ADM708ARM-REEL from Analog Devices is a precision 5 V microprocessor supervisory circuit with active-high reset output, 4.40 V supply voltage monitor threshold, 200 ms reset pulse width, and power-fail comparator (PFI/PFO). It ensures reliable system initialization and brownout protection in embedded controllers and industrial instrumentation where stable reset assertion down to 1 V VCC is required.
For engineers reviewing the ADM708ARM-REEL datasheet, ADM708ARM-REEL pinout, ADM708ARM-REEL application, or ADM708ARM-REEL equivalent, key selection criteria include guaranteed RESET validity at 1 V VCC, 190 μA quiescent current, 4.40 V reset threshold hysteresis, PFI-based low-battery warning capability, and compatibility with SOIC_N and MSOP packages for space-constrained designs.
Technical Context
The ADM708ARM-REEL implements a dedicated voltage-monitoring architecture with a precision 4.40 V reference comparator, internal 200 ms one-shot timer for reset pulse generation, and independent 1.25 V power-fail comparator with open-drain PFO output. Its active-high RESET output complements the active-low variant and eliminates need for external inversion logic in systems requiring high-true reset signaling.
No watchdog timer is integrated-unlike ADM705/ADM706-making it functionally aligned with ADM707/ADM708 family members. The MR input is TTL/CMOS-compatible, internally debounced, and pulled up with 250 μA current, enabling direct interface with push-button switches or logic outputs without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40 V ±0.15 V - triggers reset during brownout when 5 V supply drops below safe operating level. |
| Reset Pulse Width | 200 ms typical - holds processor in reset long enough for power stabilization and clock lock. |
| Quiescent Current | 190 μA - enables use in battery-backed or low-power always-on monitoring applications. |
| VCC Operating Range | 1.0 V to 5.5 V - guarantees valid RESET output even during deep brownout or soft-start ramp-up. |
| Power-Fail Comparator Threshold | 1.25 V - allows configurable early-warning detection of supply collapse via external resistive divider on PFI. |
| MR Input Pull-Up Current | 250 μA - supports direct connection to mechanical reset switch without external resistor. |
| RESET Output Type | Active-high open-drain - compatible with 3.3 V or 5 V logic families; requires external pull-up for defined high state. |
Pinout & Package
ADM708ARM-REEL is packaged in an 8-lead Mini Small Outline Package (MSOP, RM-8) with 0.65 mm pitch, 3.0 mm × 3.0 mm body size, and exposed pad for thermal enhancement. Pin 1 is marked with dot; device orientation follows JEDEC MO-187-AA standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Open-drain output asserted high during reset; requires external pull-up to VCC or logic rail. |
| 2 | RESET (active-low) | Complementary active-low reset output; used simultaneously with active-high for bidirectional reset control. |
| 3 | MR | Debounced manual reset input; pulled up internally with 250 μA; asserts reset when driven below 0.8 V. |
| 4 | VCC | 5 V power supply input; decoupling capacitor (0.1 μF) required between VCC and GND for noise immunity. |
| 5 | GND | Ground reference for all analog and digital functions; must be connected to system ground plane. |
| 6 | PFI | Noninverting input to 1.25 V power-fail comparator; monitors auxiliary supply via resistive divider. |
| 7 | PFO | Open-drain power-fail output; goes low when PFI < 1.25 V; requires external pull-up for interrupt signaling. |
| 8 | NC | No connect - left unconnected per datasheet; no internal bonding or functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET operation down to 1 V VCC | Ensures fail-safe reset hold during deep undervoltage events, preventing processor runaway before full power loss. |
| Integrated dual-reset outputs (RESET and RESET) | Eliminates need for external inverters in systems requiring both active-high and active-low reset signals. |
| 1.25 V precision power-fail comparator | Enables early warning of supply collapse or battery depletion using simple resistor network on PFI. |
| 250 μA internal MR pull-up | Supports direct mechanical switch interface without external biasing components, reducing BOM count. |
| 200 ms reset timeout with hysteresis | Prevents spurious resets during marginal supply conditions by enforcing minimum assertion duration. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Monitors 5 V main supply and 3.3 V logic rail in programmable logic controller with real-time I/O scanning. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and early power-fail interrupt via PFI/PFO. Use Value: Prevents corrupted I/O state during unstable power transitions; enables graceful shutdown before data loss. |
Use Scenario: Embedded microcontroller in portable ultrasound unit powered by rechargeable Li-ion battery. IC Role / Device Role / Timing Role: Voltage supervisor detecting battery sag below 4.40 V and issuing low-battery warning via PFO. Use Value: Triggers battery-saving mode and alerts user prior to critical discharge, extending operational uptime. |
| Telecom Remote Terminal Unit | Automotive Body Control Module |
|
Use Scenario: Outdoor RTU operating across −40°C to +85°C ambient with wide-input DC-DC converter. IC Role / Device Role / Timing Role: Primary reset generator asserting active-high RESET to ARM Cortex-M4 core during cold start. Use Value: Ensures deterministic boot sequence despite slow 5 V rail ramp-up; meets IEC 61000-4-2 ESD immunity requirements. |
Use Scenario: BCM managing door locks, lighting, and CAN communication in 12 V vehicle electrical system. IC Role / Device Role / Timing Role: Dual-output supervisor delivering synchronized RESET and RESET to MCU and peripheral ASICs. Use Value: Eliminates timing skew between subsystems during ignition-on power-up; supports ISO 16750-2 load dump robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM708ARZ-REEL | Same functional spec, but in 8-lead SOIC_N (R-8) package; 3.9 mm × 4.9 mm footprint vs. MSOP's 3.0 mm × 3.0 mm. | Preferred for through-hole prototyping or legacy PCB layouts with SOIC land patterns. | Select ADM708ARZ-REEL if board space permits larger package and reflow compatibility with standard SOIC processes is required. |
| MAX692AESA+ | Maxim Integrated part; 4.63 V reset threshold, 200 ms timeout, but lacks PFI/PFO comparator and dual-reset outputs. | Suitable only for basic reset supervision without power-fail warning or bidirectional reset support. | Choose MAX692AESA+ only when PFI monitoring and complementary RESET are not needed and RoHS-compliant SOIC is acceptable. |
Compared with ADM708ARM-REEL, ADM708ARZ-REEL offers identical electrical behavior in a larger, more thermally robust SOIC package, while MAX692AESA+ sacrifices PFI functionality and dual-reset capability for lower cost in simpler applications.
Availability
ADM708ARM-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom remote terminal units, and automotive body control modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for ADM708ARM-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, serving industrial, automotive, communications, and healthcare markets.
The ADM705–ADM708 family was designed specifically for robust, low-power microprocessor supervision in harsh environments-emphasizing guaranteed reset validity below 1 V, precision voltage thresholds, and integrated power-fail warning without external components.
FAQ
What is the reset threshold voltage for ADM708ARM-REEL?
The ADM708ARM-REEL has a nominal reset threshold of 4.40 V, with a tolerance of ±0.15 V over temperature and supply variations. This value is factory-trimmed and specified in Table 1 of the Rev. H datasheet. The threshold applies to both RESET and RESET outputs, ensuring consistent brownout detection across both polarity modes. The ADM708ARM-REEL uses this fixed threshold to initiate reset when VCC falls below the safe operating window for 5 V microprocessors.
Does ADM708ARM-REEL include a watchdog timer function?
No, ADM708ARM-REEL does not include a watchdog timer. It belongs to the ADM707/ADM708 subgroup, which omits the WDI/WDO circuitry present in ADM705/ADM706. The ADM708ARM-REEL provides only voltage monitoring, manual reset, and power-fail comparator functions. If watchdog functionality is required, the ADM706ARM-REEL (4.40 V threshold, with watchdog) must be selected instead-though it lacks the dual-reset outputs of ADM708ARM-REEL.
What package type is used for ADM708ARM-REEL?
ADM708ARM-REEL is supplied in an 8-lead Mini Small Outline Package (MSOP), designated RM-8 per JEDEC MO-187-AA. Its dimensions are 3.0 mm × 3.0 mm × 1.1 mm with 0.65 mm lead pitch and exposed thermal pad. This compact package supports high-density PCB layouts and offers better thermal performance than PDIP, though less than SOIC. The "ARM" suffix in the part number explicitly denotes the MSOP variant.
Can ADM708ARM-REEL monitor a 3.3 V supply directly?
No, ADM708ARM-REEL cannot monitor a 3.3 V supply directly-it is designed for 5 V systems with a 4.40 V reset threshold. However, its PFI input accepts any voltage referenced to GND and compares it to an internal 1.25 V reference. To monitor 3.3 V, a resistive divider (e.g., 100 kΩ + 60.4 kΩ) scales 3.3 V down to ~1.25 V at PFI. When the 3.3 V rail sags, PFO asserts low, enabling early warning without modifying the primary reset threshold.
What is the purpose of the NC pin on ADM708ARM-REEL?
Pin 8 on ADM708ARM-REEL is designated NC (No Connect) and must remain unconnected. It has no internal bond wire or circuit connection-confirmed in Figure 5 and Table 3 of the Rev. H datasheet. Leaving it floating poses no risk, but soldering or routing to this pin may cause mechanical stress or unintended coupling. The NC designation distinguishes ADM708ARM-REEL from watchdog-equipped variants (e.g., ADM706) that use this pin for WDO output.
ADM708ARM-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- -
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 160ms Minimum
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
ADM708ARM-REEL FAQ
1.How can I place an order for ADM708ARM-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708ARM-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 ADM708ARM-REEL reliable?
The price and inventory of ADM708ARM-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708ARM-REEL is usually 5 days.
3.What payment methods are accepted for ADM708ARM-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708ARM-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708ARM-REEL?
ADM708ARM-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708ARM-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 ADM708ARM-REEL?
For technical support, including ADM708ARM-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708ARM-REEL requirements.
6.How does Aetrix verify that ADM708ARM-REEL is sourced from the original manufacturer or authorized distributors?
All ADM708ARM-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 ADM708ARM-REEL meets industry standards.
7.What is the process for return or replacement of ADM708ARM-REEL?
All ADM708ARM-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM708ARM-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 ADM708ARM-REEL part is unused and in its original packaging.
Return procedure for ADM708ARM-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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